Bisan Chemicals And Engineers Private Limited

We are Manufacturer, Supplier, Exporter of Sewage Treatment Plants (STP) and we delivered our Product range all over Maharashtra include major cities like Pune, Baner, Bhosari, Ranjangaon, Aurnagabad, Nashik, Sangli, Kolhapur, Raigad, Mumbai, Nagpur.

A Moving Bed Biofilm Reactor (MBBR) is a highly effective and popular technology used in Sewage Treatment Plants (STPs). It's a type of biological treatment that combines features of both conventional activated sludge systems and traditional biofilm reactors. The key to MBBR is the use of thousands of small, specially designed plastic carriers (or media) that move freely within the wastewater.

 

How an MBBR-based STP Works:

 

1. Preliminary Treatment:

   • Screening: Large debris (rags, plastics, etc.) are removed to prevent clogging and damage to downstream equipment.

   • Grit Removal: Sand, gravel, and other heavy inorganic particles are settled out.

   • Equalization Tank (Optional but Recommended): This tank helps to balance fluctuations in the incoming sewage flow and strength, providing a more consistent feed to the biological reactor.

2. MBBR Reactor (Biological Treatment): This is the core of the MBBR system.

   • Media Carriers: The reactor tank is filled with specially designed plastic carriers (often shaped like small wheels, chips, or rings). These carriers provide a large protected surface area for microorganisms (bacteria) to attach and grow on, forming a biological film (biofilm).

   • Aeration: Air is continuously supplied to the tank, typically through fine bubble diffusers at the bottom. This serves two crucial purposes:

     • Oxygen Supply: Provides oxygen for the aerobic bacteria in the biofilm to break down organic pollutants in the sewage.

     • Media Movement: Keeps the media carriers constantly agitated and in motion, ensuring optimal contact between the wastewater, the biofilm, and the oxygen. This also helps prevent the media from clumping and ensures even distribution.

   • Organic Degradation: As the wastewater flows through the reactor, the microorganisms in the biofilm consume the organic matter (BOD, COD) from the sewage, converting it into carbon dioxide, water, and new biomass.

   • Nutrient Removal (Optional):

An MBBR (Moving Bed Biofilm Reactor) based STP (Sewage Treatment Plant) is a highly effective and popular choice for treating domestic wastewater due to its efficiency, compactness, and robustness. It's a type of biological treatment process that leverages both suspended growth (like activated sludge) and attached growth (like trickling filters) principles.

 

How an MBBR STP Plant Works:

 

The core of an MBBR system lies in its biofilm carriers (also called media). Here's a breakdown of the typical process:

1. Preliminary Treatment:

   • Screening: Raw sewage first passes through screens to remove large debris like rags, plastics, and other solid waste that could damage pumps or clog the system.

   • Grit Removal: A grit chamber removes heavier inorganic particles like sand and gravel.

   • Equalization Tank (Optional but Recommended): This tank helps to balance the flow and characteristics of the incoming sewage, preventing shock loads to the biological treatment unit.

2. Biological Treatment (MBBR Reactor): This is the heart of the MBBR system.

   • Aeration Tank (Reactor): The pre-treated sewage flows into one or more MBBR aeration tanks. These tanks are filled with thousands of small, specially designed plastic carriers (media). These carriers are typically made of high-density polyethylene (HDPE) and have a large internal surface area.

   • Biofilm Formation: Microorganisms (bacteria, protozoa, etc.) naturally attach to the surface of these carriers and grow to form a thin, biological layer called a biofilm.

   • Continuous Movement: An aeration system (typically fine bubble diffusers at the bottom of the tank) provides oxygen for the aerobic microorganisms and also keeps the carriers constantly agitated and in motion. This continuous movement ensures optimal contact between the wastewater, the biofilm, and the oxygen.

   • Organic Matter Degradation: As the wastewater flows through the reactor, the microorganisms in the biofilm consume the organic pollutants (BOD/COD) in the sewage, breaking them down into harmless byproducts like carbon dioxide, water,

An MBR (Membrane Bioreactor) based STP (Sewage Treatment Plant) represents a significant leap forward in wastewater treatment technology. It combines the conventional biological treatment process (like activated sludge) with an advanced membrane filtration process. Essentially, the traditional secondary clarifier and often the tertiary filtration steps are replaced by a membrane module directly submerged in (or external to) the bioreactor.

 

How an MBR Based STP Works:

 

1. Preliminary Treatment:

   • Screening: Removes large suspended solids, rags, and debris to protect the membranes from damage and clogging. This is even more critical for MBRs due to the delicate nature of membranes. Fine screens are typically used.

   • Grit Removal: Removes sand, grit, and other heavy inorganic particles.

   • Equalization Tank: Balances flow and pollutant load, providing a consistent feed to the biological reactor.

2. Biological Treatment (MBR Bioreactor):

   • Aeration Tank: Similar to conventional activated sludge, an aeration tank is used where a high concentration of microorganisms (activated sludge) breaks down organic pollutants (BOD, COD, nitrogen, phosphorus) in the sewage.

   • Submerged Membranes: This is the key difference. Instead of a separate clarifier, the membranes (typically hollow fiber or flat sheet configuration with very fine pores, e.g., 0.04 to 0.4 microns) are directly immersed in the mixed liquor (sludge and water mixture) of the aeration tank.

   • Suction/Pressure: A slight vacuum (suction) is applied to the membranes or a positive pressure is applied to the feed water, drawing the clean water (permeate) through the membrane pores.

   • High Biomass Concentration: Because the membranes physically separate the biomass from the treated water, the concentration of microorganisms (Mixed Liquor Suspended Solids - MLSS) in the MBR tank can be maintained at much higher levels (typically 8,000-15,000 mg/L) than in conventional activated sludge systems (2,000-4,000 mg/L). This high biomass concentration directly contributes to the system's efficiency and compactness.

   • Aeration for Membrane Scouring: In addition to providing oxygen for the microorganisms, vigorous aeration is also directed towards the membrane surfaces. This "air scour" helps to continuously clean the membranes, prevent fouling (clogging), and maintain flux (flow rate through the membrane).

3. Permeate Collection:

   • The clean water that passes through the membranes (the permeate) is collected in a header and then directed for discharge or reuse.

4.  

Sewage treatment (or domestic wastewater treatment, municipal wastewater treatment) is a type of wastewater treatment that aims to remove contaminants from sewage to produce an effluent that is suitable for discharge to the surrounding environment or an intended reuse application, thereby preventing water pollution from raw sewage discharges. 

Sewage contains wastewater tram households and businesses and possibly pre-treated industrial wastewater. There are a high number of sewage treatment processes to choose from. These can range from decentralized systems (including on-site treatment systems) to large centralized systems involving a network of pipes and pump stations (caged sewerage) which convey the sewage to a treatment plant 

A Leachate Treatment Plant (LTP) is a specialized facility designed to treat leachate, which is the liquid that drains or "leaches" from a landfill or waste disposal site. Leachate is formed when rainwater infiltrates through waste, picking up dissolved and suspended solids, organic matter, heavy metals, toxic chemicals, and various other pollutants as it passes through the decomposing waste layers. It's a highly contaminated and complex wastewater stream that poses significant environmental and health risks if not properly managed and treated.

 

Characteristics of Leachate

 

Leachate characteristics vary significantly depending on factors like:

• Age of the Landfill: Younger landfills typically produce leachate with higher concentrations of biodegradable organic matter (high BOD/COD), while older landfills produce more stabilized leachate with lower BOD/COD but potentially higher concentrations of refractory (non-biodegradable) organics, ammonia, and heavy metals.

• Type of Waste: Industrial waste landfills will produce different leachate than municipal solid waste landfills.

• Climate: Rainfall patterns and temperature influence leachate generation and characteristics.

• Landfill Design and Operation: Liner systems, daily cover, and compaction affect leachate quality and quantity.

Common pollutants in leachate include:

• High Organic Load: High Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD), often with a low BOD/COD ratio in mature landfills (indicating less biodegradability).

• High Ammonia-Nitrogen (NH₃-N): A significant and persistent pollutant.

• Heavy Metals: Lead, cadmium, chromium, nickel, zinc, etc.

• Chlorides and Sulfates: High salinity.

• Refractory Organic Compounds: Humic and fulvic acids, xenobiotic compounds (pharmaceuticals, pesticides).

• Suspended Solids.

• Pathogens.

 

Purpose of a Leachate Treatment Plant

 

The primary purpose of an LTP is to treat leachate to meet discharge standards (e.g., for release into a municipal sewer, surface water, or for reuse) or for safe disposal, preventing:

• Groundwater contamination.

• Surface water pollution.

• Soil contamination.

• Odor nuisances.

• Health risks to humans and ecosystems.

 

Typical Stages and Equipment in a Leachate Treatment Plant (LTP)

 

Given the complex and variable nature of leachate, LTPs often employ a combination of physical, chemical, and biological treatment processes, and sometimes advanced separation technologies.

1. Pre-Treatment / Collection: * Leachate Collection System: Wells, sumps, and pumps to collect leachate from the landfill liner. * Equalization Tank: Crucial for buffering variations in flow and pollutant concentration of leachate, ensuring a more consistent feed to the treatment units. Often includes aeration to prevent anaerobic conditions and reduce odors. * Screens: To remove large debris that might come with the leachate.

2. Physical-Chemical Treatment: (Often used as pre-treatment for biological systems or for specific contaminant removal) * pH Adjustment: Chemical dosing systems (acids or alkalis) to adjust leachate pH, which can be very acidic or alkaline. * Coagulation & Flocculation: Dosing coagulants (e.g., ferric chloride, aluminum sulfate) and flocculants (polymers) to remove suspended solids, colloids, and some heavy metals. * Clarifiers/Sedimentation 

ewage Treatment Plants (STPs) heavily rely on a variety of electro-mechanical equipment to perform the various stages of wastewater purification. These components are essential for moving, mixing, aerating, separating, and disinfecting the sewage.

 

Here's a breakdown of the key electro-mechanical equipment found in STPs:

I. Preliminary Treatment:

•  Screens (Bar Screens, Fine Screens, Micro Screens): These are the first line of defense, designed to remove large solid objects (rags, plastics, debris) from the incoming wastewater.

   

  • Coarse Screens: Have larger openings (6mm to 150mm) and remove larger debris. They can be hand-cleaned or mechanically cleaned.

  •  Fine Screens: Have smaller openings (less than 6mm) and remove finer suspended solids. Examples include drum screens, step screens, and continuous belt screens.

     

  • Mechanically Cleaned Screens: Utilize rakes or brushes to continuously remove accumulated debris, improving efficiency and preventing clogging.

     

•  Grit Chambers/Separators: Remove inorganic grit like sand, gravel, and coffee grounds, which can cause abrasion and wear in pumps and other equipment.

   

  • Electro-mechanical components here might include grit pumps and agitators to keep organic matter in suspension while grit settles.

     

II. Primary Treatment (Sedimentation/Clarification):

• Clarifiers (Primary Clarifiers): Large tanks where heavier suspended solids settle to the bottom by gravity.

   

  •  Scrapers/Raker Arms: Motorized mechanisms that continuously scrape the settled sludge from the bottom to a central hopper for removal.

     

  •  

Being a foremost organization in the industry, we are actively engaged in offering the best quality range of Domestic Sewage Treatment Plant.

We deal in domestic waste water treatment plant , domestic stp , sewage treatment plant for home in india , home sewage treatment plant cost Sewage water treatment plant can remove all major contaminations from water in spite of them being solid or really tiny. For this, the domestic plant follows a process to attain quality treated water.These plants are installed to prevent water scarcity in areas or properties currently facing one. Domestic sewage substantially includes the waste in the form of paper, food, wastewater of bathroom and sink, human waste and alike. It is necessary to remove all these waste before letting the wastewater out in the environment. The treated water won’t go to waste has it will be clean to reuse. This will help develop a sustainable and eco-friendly environment and will help to save water for our future generations.The treated water won’t go to waste has it will be clean to reuse. This will help develop a sustainable and eco-friendly environment and will help to save water for our future generations.
A domestic sewage water treatment plant is an excellent and cost-efficient measure to attain pure wastewater. As the name says, this plant purifies waste in a domestic (or residential) area or establishment and turns them into reusable water. The installed domestic sewage treatment plant can be used in the big industries too if they have only a few people. This would help to prevent waste from flowing directly into the environment. The treated water will be clean enough for reuse, which will help develop a sustainable and eco-friendly environment.
 The process starts with the screening of the water and removing visible objects like plastic bottles, leaves, clothing items and alike. Then the water is passed through screens to separate solids such as rags, pebbles, sand and dirt. All these removed solid matters are kept for further treatment or gets disposed off. After this comes the grit collection unit which removes pebbles, edges and hard fragments from water that might damage other parts of the plant.
Whether it's the kitchen sink, the toilet or the shower we will all use domestic sewage treatment plants ("sewerage") at some point in our lives. Sewerage systems are used on a large scale in urban areas to collect domestic waste water and dirty water from industrial plant and take them directly to a waste water treatment plant. At home, you may have a septic tank (i.e. your own small-scale sewage works) or if you're lucky, connect directly to the sewers provided by your local authority.


we also deal in domestic waste water treatment plant , underground drainage and sewage systemsewage treatment plant,SBR sewage treatment plant,mbr sewage treatment plant,prefabricated domestic stp,domestic sewage system or domestic sewage treatment system,domestic stp ,MBBR sewage treatment plant

An SBR (Sequencing Batch Reactor) based STP (Sewage Treatment Plant) is a highly flexible and efficient type of activated sludge process used for treating domestic and sometimes industrial wastewater. Unlike conventional continuous flow systems, an SBR operates in a batch mode, meaning all the treatment steps (filling, reaction, settling, and drawing) occur sequentially in a single tank.

 

How an SBR Based STP Works:

 

An SBR system typically consists of one or more reactor tanks that operate on a timed cycle. A typical cycle for a single SBR tank involves five distinct phases:

1. Fill (or Anoxic Fill):

   • Raw, pre-screened, and grit-removed sewage enters the SBR tank.

   • During this phase, the tank is partially filled with new influent and existing activated sludge.

   • Mixing may occur without aeration (anoxic conditions) to promote denitrification (conversion of nitrates to nitrogen gas) if nitrogen removal is a target. This helps reduce the total nitrogen in the effluent.

   • The fill time is crucial and depends on the influent flow rate.

2. React (Aeration):

   • Once the tank is filled to the desired level, or after a specific anoxic period, aeration begins.

   • Air (oxygen) is supplied to the mixed liquor (wastewater + activated sludge) in the tank using diffusers or mechanical aerators.

   • Aerobic microorganisms actively break down organic pollutants (BOD, COD) into carbon dioxide, water, and new biomass.

   • Nitrification (conversion of ammonia to nitrates) also occurs during this aerobic phase.

   • The duration of the react phase depends on the organic load and the desired treatment efficiency.

3. Settle (Sedimentation/Clarification):

   • Aeration and mixing are stopped, allowing the activated sludge (biomass) to settle by gravity to the bottom of the tank, forming a clear layer of treated water (supernatant) above.

   • This phase is critical for achieving good separation of solids from the liquid.

4. Decant (Draw):

   • After settling, the treated supernatant (effluent) is slowly and carefully drawn off from the top of the tank, typically using a specialized decanter mechanism that prevents settled sludge from being drawn along with the effluent.

   • A certain volume of sludge is usually left in the tank to act as the "seed" for the next cycle.

5. Idle (or Waste Sludge/Refill Preparation):

   • This is an optional phase, a short period between the decant and the next fill cycle.

   • During this time, excess sludge can be wasted from the bottom of the tank to maintain the desired sludge age.

   •  

An MBR (Membrane Bioreactor) based STP (Sewage Treatment Plant) represents a significant leap forward in wastewater treatment technology. It combines the conventional biological treatment process (like activated sludge) with an advanced membrane filtration process. Essentially, the traditional secondary clarifier and often the tertiary filtration steps are replaced by a membrane module directly submerged in (or external to) the bioreactor.

 

How an MBR Based STP Works:

 

1. Preliminary Treatment:

   • Screening: Removes large suspended solids, rags, and debris to protect the membranes from damage and clogging. This is even more critical for MBRs due to the delicate nature of membranes. Fine screens are typically used.

   • Grit Removal: Removes sand, grit, and other heavy inorganic particles.

   • Equalization Tank: Balances flow and pollutant load, providing a consistent feed to the biological reactor.

2. Biological Treatment (MBR Bioreactor):

   • Aeration Tank: Similar to conventional activated sludge, an aeration tank is used where a high concentration of microorganisms (activated sludge) breaks down organic pollutants (BOD, COD, nitrogen, phosphorus) in the sewage.

   • Submerged Membranes: This is the key difference. Instead of a separate clarifier, the membranes (typically hollow fiber or flat sheet configuration with very fine pores, e.g., 0.04 to 0.4 microns) are directly immersed in the mixed liquor (sludge and water mixture) of the aeration tank.

   • Suction/Pressure: A slight vacuum (suction) is applied to the membranes or a positive pressure is applied to the feed water, drawing the clean water (permeate) through the membrane pores.

   • High Biomass Concentration: Because the membranes physically separate the biomass from the treated water, the concentration of microorganisms (Mixed Liquor Suspended Solids - MLSS) in the MBR tank can be maintained at much higher levels (typically 8,000-15,000 mg/L) than in conventional activated sludge systems (2,000-4,000 mg/L). This high biomass concentration directly contributes to the system's efficiency and compactness.

   • Aeration for Membrane Scouring: In addition to providing oxygen for the microorganisms, vigorous aeration is also directed towards the membrane surfaces. This "air scour" helps to continuously clean the membranes, prevent fouling (clogging), and maintain flux (flow rate through the membrane).

3. Permeate Collection:

   • The clean water that passes through the membranes (the permeate) is collected in a header and then directed for discharge or reuse.

4. Sludge Management:

   • Excess sludge (biomass) that accumulates in the MBR tank is periodically removed and sent for further dewatering and disposal. MBR systems typically produce less excess sludge compared to conventional activated sludge processes.

5. Chemical Cleaning (CIP - Clean-in-Place):

   • Even with air scouring, membranes can eventually experience some fouling. Periodic chemical cleaning (e.g., using dilute sodium hypochlorite or citric acid solutions) is performed to restore membrane permeability. This is often an automated process.

 

A Containerized Sewage Treatment Plant (CSTP) is a compact, pre-fabricated, and self-contained wastewater treatment system built inside standard shipping containers (typically 20ft or 40ft). This "plug-and-play" design allows for rapid deployment, ease of transport, and flexibility, making them ideal for situations where traditional civil construction of an STP is not feasible or desired.

 

Key Features and Concept

 

• Modular Design: All necessary treatment components (tanks, pumps, blowers, controls, etc.) are integrated within one or more containers.

• Plug-and-Play: Designed for quick installation. Once delivered, they primarily require connection to the raw sewage inlet, treated effluent outlet, power supply, and a drain for sludge/backwash.

• Portability: Can be easily transported by road, rail, or sea, making them suitable for remote locations or temporary needs.

• Compact Footprint: Maximizes space utilization, making them ideal for sites with limited land availability.

• Scalability: Multiple containers can be combined to treat larger volumes of sewage.

• Factory-Built and Tested: Most of the fabrication and assembly are done in a controlled factory environment, ensuring quality control and reducing on-site construction time and disruption.

• Weather-Resistant: The container structure provides protection from environmental elements.

 

Typical Treatment Processes within a CSTP

 

CSTPs utilize various established wastewater treatment technologies, scaled down to fit within the container. Common processes include:

1. Preliminary Treatment:

   • Bar Screen: Manual or automatic screens to remove large debris.

   • Grit Chamber: Sometimes integrated, or a small separate unit, to settle grit.

2. Primary Treatment:

   • Equalization Tank: A small tank or section within the container to buffer flow and load variations.

   • Settling/Sedimentation: A compartment for initial settling of solids.

3. Secondary (Biological) Treatment: This is the core of most CSTPs, often using advanced biological methods for efficiency in a small space:

   • Activated Sludge Process (ASP): Compact versions with fine bubble diffusers for aeration.

   • Moving Bed Biofilm Reactor (MBBR): Very popular for CSTPs due to their high volumetric efficiency and ability to handle shock load

Bisan Packaged Sewage Treatment Plant (PSTP) is housed in specially designed and highly durable MSEP tank. 

The Bisan Packaged STP is designed to bring the treated sewage parameters (BOD, COD, TSS, TN etc.) below the permissible limit which is stipulated by the Pollution Control Board. MBBR technology is used in this system.

APPLICATION AND USES

 

• Residential and Commercial Complex
• Public Garden and National Park
• Hotel & Resorts
• Restaurants
• Industries
• Institutions
• Hospitals
• Temples
• Government Offices
• Labour Quarters
• Township
• Hostels

A Sewage Treatment Plant (STP) is a facility designed to treat wastewater generated from domestic, commercial, and industrial activities. The primary goal is to remove contaminants, solid waste, organic matter, and harmful pathogens to produce treated water that is safe for discharge into the environment or for reuse

Packaged System Product Advantages:

– Pre-assembled, skid-mounted and factory-tested packaged systems have less requirements for installation and reduced onsite construction costs.
– Compact designs for easy integration into existing facilities
– Completed engineering packages with quick delivery
– Comprehensive cleaning capabilities for peak systems performance
– Simple operation and maintenance requires minimal operator supervision

Sewage treatment (or domestic wastewater treatment, municipal wastewater treatment) is a type of wastewater treatment that aims to remove contaminants from sewage to produce an effluent that is suitable for discharge to the surrounding environment or an intended reuse application, thereby preventing water pollution from raw sewage discharges. 

Sewage contains wastewater tram households and businesses and possibly pre-treated industrial wastewater. There are a high number of sewage treatment processes to choose from. These can range from decentralized systems (including on-site treatment systems) to large centralized systems involving a network of pipes and pump stations (caged sewerage) which convey the sewage to a treatment plant 

A Compact Sewage Treatment Plant (STP) is a self-contained, pre-engineered, and often modular or prefabricated system designed to treat domestic wastewater (sewage) from residential complexes, commercial buildings, hotels, hospitals, educational institutions, and even industrial facilities (for their domestic sewage, not process effluent). They are particularly beneficial where space is limited, or rapid deployment is required.

 

How Compact STPs Work (General Principles):

 

Compact STPs utilize a combination of physical, biological, and sometimes chemical processes to purify sewage. Common technologies employed include:

1. Preliminary Treatment:

   • Screening: Removes large floating debris (rags, plastics, etc.) to protect pumps and downstream equipment.

   • Grit Chamber: Allows heavier inorganic particles like sand and grit to settle.

2. Primary Treatment:

   • Sedimentation/Settling Tank: Raw sewage flows into a tank where heavier suspended solids settle to the bottom (forming primary sludge), and lighter materials (grease, oil) float to the surface (scum). This stage removes a significant portion of suspended solids and some organic matter.

3. Secondary (Biological) Treatment: This is the core of sewage treatment, where microorganisms break down organic pollutants.

   • Aeration Tank: Air (oxygen) is introduced into the wastewater to promote the growth of aerobic bacteria. These bacteria consume the organic matter in the sewage as their food source, converting it into carbon dioxide, water, and more biomass (activated sludge).

   • Common Biological Technologies in Compact STPs:

     • Mixed Bed Bio Reactor (MBBR): Uses small plastic carriers (media) with a large surface area for bacteria to grow on. These carriers are kept in suspension within the aeration tank. MBBRs are known for their compact size, robustness, and ability to handle varying loads.

A Sewage Treatment Plant (STP) is a facility designed to remove contaminants from wastewater, primarily from domestic sources (residential buildings, commercial complexes, hotels, hospitals). The goal of an STP is to produce treated water (effluent) that can be safely discharged back into the environment or reused for non-potable purposes, and to manage the solid byproducts (sludge).

STPs are crucial for:

• Protecting public health: By eliminating disease-causing pathogens.

• Preventing environmental pollution: By removing harmful organic matter, nutrients (nitrogen, phosphorus), and suspended solids that can degrade natural water bodies.

• Water conservation: By enabling the reuse of treated wastewater for irrigation, toilet flushing, industrial cooling, and other non-drinking applications, reducing the reliance on fresh water sources.

Basic Process Stages of an STP:

STPs typically involve a series of physical, chemical, and biological processes to achieve different levels of purification.

1. Preliminary Treatment:

   • Purpose: To remove large, easily removable solids that can damage or clog downstream equipment.

   • Process:

     • Screening: Raw sewage passes through bar screens (coarse and fine) that capture large debris like rags, plastics, wood, and other trash. Mechanical screens are often used for continuous cleaning.

     • Grit Removal: The water then flows into grit chambers where sand, gravel, and other heavy inorganic solids (grit) settle out by gravity. This prevents abrasion of pumps and pipes.

   • Electro-Mechanical Components: Mechanical screens, grit pumps, grit classifiers.

2. Primary Treatment:

   • Purpose: To remove a significant portion of suspended solids and some organic matter through sedimentation.

   • Process: Wastewater flows slowly into large primary clarifiers (or sedimentation tanks). Heavier organic and inorganic solids settle to the bottom as "primary sludge," while lighter materials like oil and grease float to the surface as "scum."

   • Electro-Mechanical Components: Scrapers/Raker arms (motorized) to collect settled sludge, skimmers to remove floating scum, primary sludge pumps to transfer the sludge for further treatment.

3. Secondary Treatment (Biological Treatment):

   • Purpose: To remove dissolved and fine suspended organic matter using microorganisms. This is the heart of most STPs, significantly reducing the Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD).

, sometimes also referred to as a Packaged STP or a Skid-Mounted STP, is a sewage treatment system where most of the primary components (tanks, piping, pumps, blowers, control panel, etc.) are pre-built and assembled in a factory, often on a common skid or within pre-fabricated modular units, before being transported to the site for installation.

This contrasts with traditional "civil construction" STPs, where the tanks and major structures are built entirely on-site using concrete and other civil engineering methods.

 

Key Characteristics of Fabricated STPs:

 

1. Factory-Built Quality: Components are manufactured and assembled in a controlled factory environment, leading to better quality control, precision, and often more robust construction compared to on-site civil works, especially in challenging weather conditions.

2. Reduced On-Site Construction Time: A significant portion of the work is done off-site, drastically cutting down installation time at the final location. This means less disruption, noise, and labor requirements on the actual site.

3. Modular & Compact Design: They are designed to be compact and efficient in terms of footprint, making them suitable for sites with limited space. The modular nature allows for easier expansion by adding more units if required.

4. Faster Commissioning: Since most of the system is pre-assembled and often pre-tested, commissioning times are typically shorter.

5. Cost-Effective (for certain capacities): While the initial unit cost might sometimes seem higher than raw civil construction, the savings in on-site labor, reduced project time, and consistent quality often make them more economical for small to medium capacities.

6. "Plug-and-Play" (to an extent): While not as portable as truly containerized units, they are designed for relatively easy connection to the inlet sewage line, treated effluent d

Electrocoagulation technology is treatment process of applying electrical current to treat and flocculate contaminates without having to add coagulation. Electrocoagulation is an alternative method to classic chemicals coagulation for many reasons. Electrocoagulation is an electro chemical process

An Industrial Sewage Treatment Plant (ISTP), also commonly referred to as an Effluent Treatment Plant (ETP) when dealing with a broader range of industrial wastewater, is a specialized facility designed to treat the wastewater generated by industrial processes before it is discharged into the environment or reused. This wastewater, known as industrial effluent, is often significantly different from domestic sewage and can contain a variety of pollutants specific to the industry, such as heavy metals, complex organic compounds, oils, greases, high salinity, acids, alkalis, and toxic chemicals.

 

The primary goal of an ISTP/ETP is to remove or reduce these contaminants to levels that meet stringent environmental regulations (discharge standards) to prevent pollution of natural water bodies and protect public health.

 

Key Differences from Domestic Sewage Treatment Plants (STPs)

 

While ISTPs share some common processes with domestic STPs, the key differences lie in:

•  Wastewater Characteristics: Industrial effluents are highly variable, often more concentrated, and may contain non-biodegradable or toxic components.

   

• Treatment Complexity: ISTPs often require more complex and specialized treatment technologies tailored to the specific pollutants.

   

•  Pre-treatment Needs: Industrial wastewater frequently needs more extensive pre-treatment to handle extreme pH, high suspended solids, or specific chemicals.

   

• Regulatory Compliance: Industrial discharge standards can be much stricter and industry-specific.

   

 

Typical Stages and Equipment in an Industrial Sewage Treatment Plant (ISTP/ETP)

 

The actual configuration of an ISTP varies greatly depending on the type of industry, the volume of wastewater, and the nature of the pollutants. However, a typical plant often includes the following stages:

A Commercial Sewage Treatment Plant (CSTP) is a wastewater treatment facility specifically designed to treat domestic sewage generated by commercial establishments. This includes businesses such as hotels, resorts, hospitals, shopping malls, office complexes, educational institutions, housing societies, industrial parks (for their domestic sewage component), and other similar facilities that generate wastewater akin to household sewage.

The primary goal of a CSTP is to treat this sewage to a quality that meets local environmental discharge standards, allowing it to be safely released into a municipal sewer system (if permitted), a nearby water body, or often, reused for non-potable purposes like landscaping, toilet flushing, or cooling tower make-up.

 

Key Differences from Municipal STPs and Industrial ETPs

 

• Compared to Municipal STPs: CSTPs are typically smaller in scale and designed for specific establishments rather than an entire city or town. They are often modular or packaged units for easier installation on-site.

• Compared to Industrial ETPs: CSTPs primarily deal with domestic-type sewage (human waste, grey water from kitchens, laundries, bathrooms) and generally do not face the complex chemical or heavy metal contamination often found in industrial effluents. This simplifies the treatment process significantly, although some commercial entities (like hospitals or laundries) might have specific constituents that require minor adjustments.

 

Typical Stages and Equipment in a Commercial Sewage Treatment Plant

 

CSTPs employ a combination of physical, biological, and sometimes chemical processes, similar to larger municipal STPs but adapted for a commercial scale.

1. Preliminary Treatment: (To remove large solids and protect downstream equipment)

   • Bar Screen: Removes large floating debris like rags, plastic,

Operation and Maintenance (O&M) Services: This is the most common and critical service. It involves the day-to-day running and upkeep of the STP to ensure continuous and efficient treatment.

• Routine Checks & Monitoring:

  • Daily Site Visits: By trained operators to check all operational parameters.

  • Equipment Inspection: Checking pumps, blowers, motors, valves, mixers for proper functioning, unusual noises, leaks, and wear.

  • Process Parameter Monitoring: Checking Dissolved Oxygen (DO) levels in aeration tanks, pH, ORP, sludge return rates, flow rates, and clarifier performance.

  • Log Book Maintenance: Recording all readings, observations, and actions taken.

• Chemical Management:

  • Monitoring and replenishing chemical levels (e.g., chlorine for disinfection, defoamers).

  • Calibrating dosing pumps for accurate chemical addition.

• Sludge Management:

  • Monitoring sludge levels in clarifiers and sludge collection tanks.

  • Managing sludge withdrawal and transfer to dewatering units.

  • Overseeing sludge dewatering operations (e.g., filter press operation, sludge cake removal).

• Cleaning & Housekeeping:

  • Regular cleaning of screens, grit chambers, tanks, and surrounding areas.

  • Removing scum and debris.

  • Keeping the plant site clean and organized.

• Troubleshooting Minor Issues:

  • Addressing small blockages, minor leaks, or immediate operational anomalies.

2. Annual Maintenance Contracts (AMCs): Many service providers offer AMCs, which are long-term contracts (typically yearly) covering scheduled preventive maintenance, routine checks, and often emergency breakdown support. AMCs provide peace of mind and help in budgeting for STP upkeep.

• Types of AMCs:

  • Basic AMC: Covers routine visits, minor adjustments, and troubleshooting. Does not include spare parts or major repairs.

  • Comprehensive AMC: Includes all routine maintenance, minor repairs, and replacement of certain wear-and-tear parts. May or may not include major component replacements (e.g., motors, blowers).

  • Operation & Maintenance (O&M) Contracts: Full-fledged contracts where the service provider takes complete responsibility for the daily operation and maintenance, including staffing, chemical procurement, and often energy optimization.

3. Repair and Breakdown Services: When an STP component malfunctions or the plant experiences a breakdown, repair services are crucial.

• Emergency Call-Outs: For urgent issues that disrupt plant operation or lead to non-compliant discharge.

• Diagnosis and Troubleshooting: Identifying the root cause of problems (e.g., pump failure, blower issues, electrical faults, process upsets, membrane fouling).

• Component Repair/Replacement: Repairing or replacing faulty pumps, motors, gearboxes, blowers, valves, control systems, diffusers, membranes, etc.

• Pipeline & Tank Repairs: Addressing leaks, blockages, or structural damage.

• Electrical & Automation Troubleshooting: Fixing issues with PLC, sensors, wiring, and control panels.