Description
A biological sewage treatment plant is an important wastewater treatment system that uses naturally occurring microorganisms to break down biodegradable organic matter present in sewage. It is widely used for treating domestic wastewater generated by apartments, residential societies, hotels, hospitals, schools, institutions, commercial buildings, industries, and other establishments.
V AQUA WATER TREATMENT COMPANY is a manufacturer and supplier of sewage and wastewater treatment systems in India, offering customized biological sewage treatment plants for different capacities and applications.
With a focus on quality, automation, economical engineering, and long-term operation, V AQUA provides STP solutions designed according to sewage flow, wastewater characteristics, available space, and treated-water requirements.
What Is a Biological Sewage Treatment Plant?
A biological sewage treatment plant (STP) uses microorganisms to remove biodegradable pollutants from sewage.
The microorganisms consume organic matter as part of their biological activity. Properly designed aeration and process conditions support this biological treatment.
A biological STP can include several stages, such as:
- Screening
- Sewage collection
- Equalization
- Biological treatment
- Aeration
- Clarification
- Filtration
- Disinfection
- Sludge management
- Treated-water storage
The exact treatment process depends on the selected technology, sewage characteristics, required treatment quality, and project requirements.
Why Is Biological Sewage Treatment Important?
Domestic sewage contains organic matter, suspended solids, microorganisms, nutrients, and other pollutants. If untreated sewage is discharged directly into the environment, it can contribute to water pollution and create sanitation problems.
Biological treatment helps reduce biodegradable organic pollutants before the treated water is discharged or reused.
A biological STP can help with:
- Wastewater pollution control
- Sewage management
- Water conservation
- Treated-water reuse
- Environmental protection
- Sanitation improvement
- Compliance with applicable treatment requirements
About V AQUA Water Treatment Company
V AQUA WATER TREATMENT COMPANY provides water purification and wastewater treatment solutions for residential, commercial, institutional, and industrial applications.
Its product range includes:
- Biological Sewage Treatment Plants
- Automatic STP Plants
- Modular STP Plants
- Residential STP Plants
- Commercial STP Plants
- Industrial STP Plants
- Effluent Treatment Plants
- RO Plants
- Industrial RO Plants
- Commercial RO Plants
- Water Treatment Plants
- Water Softeners
- Ultrafiltration Systems
V AQUA states that it has 20+ years of experience in the water treatment industry and focuses on providing quality, economical, and sustainable treatment solutions.
How Does a Biological STP Work?
The biological treatment process generally consists of several interconnected stages.
Sewage Collection
Domestic wastewater from toilets, bathrooms, kitchens, washing areas, and other sources is collected and transferred to the STP.
Screening
A screening system removes larger materials such as plastic, cloth, paper, hair, and other coarse solids.
Screening protects pumps and downstream treatment equipment.
Equalization
An equalization tank can help balance variations in sewage flow and pollutant concentration.
This provides a more consistent flow to the biological treatment process.
Biological Treatment
This is the central stage of a biological STP.
Microorganisms consume biodegradable organic matter present in sewage. Depending on the technology, microorganisms can grow as suspended biomass or attached biomass on a suitable media.
The biological process helps reduce parameters such as BOD and COD, subject to the characteristics of the sewage and the treatment system.
Aeration
Aeration supplies oxygen required by aerobic microorganisms.
Air blowers and diffusers are commonly used to transfer oxygen into the biological reactor.
Proper aeration is important for maintaining biological activity and stable treatment performance.
Clarification
After biological treatment, biological solids need to be separated from the treated water.
A clarifier allows suspended solids to settle, producing clearer water for subsequent treatment stages.
Filtration
Additional filtration can be used when improved treated-water clarity is required.
Depending on the design, the system may include:
- Sand filtration
- Activated carbon filtration
- Pressure filtration
- Micron filtration
- Membrane filtration
Disinfection
Disinfection helps reduce microorganisms in the treated wastewater.
Possible technologies include:
- Chlorination
- Sodium hypochlorite dosing
- UV disinfection
The appropriate method depends on the intended application and required treated-water quality.
Treated Water Storage
After treatment, water can be transferred to a treated-water storage tank.
Where permitted and where quality requirements are met, treated wastewater can potentially be reused for suitable non-potable applications.
Biological STP Technologies
Different biological technologies are available for sewage treatment.
MBBR Sewage Treatment Plant
Moving Bed Biofilm Reactor (MBBR) technology uses specially designed media that provide a surface for microorganisms to grow.
MBBR systems can provide a compact biological treatment configuration and are widely used for domestic wastewater treatment.
SBR Sewage Treatment Plant
Sequencing Batch Reactor (SBR) performs different treatment stages within a reactor according to a programmed sequence.
Typical cycles can include:
- Fill
- React
- Settle
- Decant
- Idle
SBR systems can be suitable for projects where batch biological treatment is appropriate.
MBR Sewage Treatment Plant
Membrane Bioreactor (MBR) combines biological treatment with membrane filtration.
The membrane separation process can produce high-quality treated water, making MBR suitable for applications where higher treated-water quality and reuse are required.
Extended Aeration STP
Extended aeration provides longer biological treatment conditions to support the breakdown of organic matter.
The appropriate technology should be selected according to the specific project requirements.
Main Components of a Biological STP
A biological sewage treatment plant may contain the following components:
| Component | Function |
|---|---|
| Bar Screen | Removes coarse solids |
| Collection Tank | Receives sewage |
| Equalization Tank | Balances flow |
| Feed Pump | Transfers sewage |
| Biological Reactor | Biological treatment |
| Air Blower | Supplies oxygen |
| Air Diffusers | Distributes air |
| MBBR Media | Supports biofilm growth |
| Clarifier | Separates biological solids |
| Filter | Improves treated-water clarity |
| Disinfection Unit | Reduces microorganisms |
| Sludge Pump | Handles sludge |
| Control Panel | Controls plant equipment |
| Sensors | Monitors operating conditions |
| Treated Water Tank | Stores treated water |
The final equipment list depends on plant capacity and treatment technology.
Benefits of a Biological Sewage Treatment Plant
Biological STPs offer several advantages for domestic wastewater treatment.
Effective Organic Matter Reduction
Microorganisms naturally break down biodegradable organic matter in sewage.
Suitable for Domestic Sewage
Biological treatment is widely used for sewage generated by residential and commercial facilities.
Water Reuse Potential
Depending on treatment quality and applicable requirements, treated wastewater can potentially be reused for gardening, toilet flushing, landscaping, and other non-potable purposes.
Scalable Capacity
Biological treatment systems can be designed for small, medium, and large capacities.
Automation Options
Automatic controls can be incorporated for pumps, blowers, valves, sensors, and other equipment.
Long-Term Wastewater Management
A properly designed and maintained biological STP can provide a structured solution for continuous sewage treatment.
Why Choose V AQUA for Biological STP?
Choosing the right STP manufacturer is important because wastewater treatment performance depends on both process design and equipment selection.
V AQUA focuses on the following areas.
Economical STP Solutions
V AQUA promotes its STP systems as economical wastewater treatment solutions.
The company markets certain V AQUA STP systems with a stated cost advantage of up to 40% in selected comparisons. Actual savings can vary according to capacity, technology, equipment specifications, installation requirements, and the alternative system being compared.
Quality-Focused Manufacturing
A biological STP operates continuously, making equipment quality important.
V AQUA focuses on appropriate selection of:
- Pumps
- Blowers
- Diffusers
- Valves
- Piping
- Biological media
- Electrical components
- Control systems
Long Service Life
V AQUA states that its STP systems can have a potential service life of approximately 20–32 years, depending on installation, operation, maintenance, environmental conditions, and replacement of individual components.
Material Certificates
V AQUA states that applicable certificates and material documentation can be provided for supplied materials and components.
This can help customers verify relevant specifications and documentation.
Customized STP Design
Biological STPs can be customized according to:
- Sewage flow
- Population
- Wastewater characteristics
- Peak flow
- Available space
- Treatment technology
- Treated-water quality
- Reuse requirements
- Site conditions
Biological STP Plant for Apartments
Apartment complexes and housing societies generate domestic sewage every day.
A biological STP can treat wastewater generated from:
- Toilets
- Bathrooms
- Kitchens
- Washing
- Cleaning
- Other domestic activities
The required capacity should be calculated based on population, water consumption, sewage generation, peak flow, and future requirements.
V AQUA can provide customized biological STP systems for residential societies and apartment projects.
Biological STP for Hotels
Hotels generate wastewater from guest rooms, restaurants, kitchens, laundry facilities, staff areas, and other operations.
A hotel biological STP should consider:
- Number of rooms
- Occupancy
- Restaurant capacity
- Kitchen wastewater
- Laundry wastewater
- Staff population
- Peak wastewater flow
The plant can be designed according to the expected wastewater generation and treated-water requirements.
Biological STP for Hospitals
Hospitals can generate wastewater from patient areas, bathrooms, kitchens, laboratories, staff facilities, and other departments.
Hospital wastewater characteristics should be evaluated before finalizing treatment technology and process design.
V AQUA can provide customized wastewater treatment solutions according to project-specific requirements.
Biological STP for Commercial Buildings
Offices, shopping complexes, restaurants, business parks, and other commercial facilities generate domestic wastewater that requires systematic management.
A biological STP can provide a structured treatment solution for such facilities.
Biological STP for Industrial Campuses
Industrial facilities may generate domestic sewage along with process wastewater.
The wastewater streams should be evaluated separately.
Domestic sewage → Biological STP
Industrial process effluent → ETP or specialized treatment
V AQUA provides both STP and ETP solutions for different wastewater sources.
Biological STP Plant Capacity
V AQUA can provide sewage treatment systems for different capacities according to project requirements.
Common capacities include:
- 5 KLD
- 10 KLD
- 15 KLD
- 20 KLD
- 25 KLD
- 30 KLD
- 50 KLD
- 75 KLD
- 100 KLD
- 150 KLD
- 200 KLD
- 500 KLD
- 1000 KLD
- Customized capacities
KLD means Kilolitres per Day.
A 15 KLD STP has a nominal capacity of approximately 15,000 litres per day, subject to the final hydraulic and process design.
Biological STP Plant Price in India
The cost of a biological sewage treatment plant depends on several factors.
These can include:
- Plant capacity
- Biological treatment technology
- Tank configuration
- Construction material
- Pumps
- Blowers
- Aeration system
- Biological media
- Filtration
- Disinfection
- Automation
- Electrical panel
- Installation
- Transportation
- Civil work
- Site conditions
V AQUA’s 15 KLD STP Plant price starts from approximately ₹5.92 lakh, subject to final technical specifications and project scope.
| STP Capacity | Indicative Price |
|---|---|
| 10 KLD | Contact V AQUA |
| 15 KLD | ₹5.92 Lakh onwards |
| 20 KLD | Contact V AQUA |
| 25 KLD | Contact V AQUA |
| 50 KLD | Contact V AQUA |
| 100 KLD | Contact V AQUA |
| 200 KLD | Contact V AQUA |
| 500 KLD | Contact V AQUA |
| 1000 KLD | Contact V AQUA |
Prices are indicative starting prices and may vary depending on technology, equipment, automation, installation, transportation, civil work, and site conditions.
Factors Affecting Biological STP Cost
The cost of a biological STP cannot be determined by capacity alone.
Important cost factors include:
Treatment Technology
MBBR, SBR, MBR, and extended aeration systems have different equipment requirements and operating characteristics.
Capacity
Larger plants require larger reactors, pumps, blowers, clarifiers, filters, and electrical systems.
Automation
PLC/HMI-based control systems, sensors, automatic valves, and monitoring equipment can affect the total project cost.
Construction Material
The material and construction configuration selected for the plant can affect pricing.
Installation
Installation conditions, site accessibility, electrical work, piping, and commissioning requirements can affect the final cost.
Civil Work
Civil construction may be included or excluded depending on the quotation and project scope.
Automatic Biological Sewage Treatment Plant
Biological STPs can be equipped with automatic controls to simplify routine operation.
An automatic system may control:
- Feed pumps
- Air blowers
- Return sludge pumps
- Automatic valves
- Level sensors
- Timers
- Disinfection dosing
- Alarms
- Electrical protection
Automation can reduce routine manual intervention, but regular inspection and maintenance remain necessary.
Water Quality Parameters in Biological STP
The performance of a biological sewage treatment plant can be evaluated using various wastewater parameters.
Depending on the application, important parameters may include:
- pH
- BOD
- COD
- TSS
- Nitrogen
- Phosphorus
- Ammoniacal nitrogen
- Fecal indicators
- Other project-specific parameters
The required treated-water quality should be established according to the intended discharge or reuse application and applicable requirements.
Why Proper STP Design Matters
A sewage treatment plant should not be selected only by capacity or price.
An appropriately designed system considers:
Sewage Quantity → Wastewater Characteristics → Treatment Technology → Hydraulic Design → Biological Process → Filtration → Disinfection → Treated-Water Application
Incorrect sizing or inappropriate treatment technology can affect plant performance.
Therefore, customers should provide accurate information about wastewater generation and intended reuse before ordering an STP.
Biological STP Operation and Maintenance
Regular operation and maintenance are important for maintaining biological treatment performance.
Maintenance activities may include:
- Cleaning screens
- Checking feed pumps
- Inspecting blowers
- Checking air diffusers
- Monitoring aeration
- Checking biological media
- Managing sludge
- Cleaning filters
- Checking valves
- Inspecting sensors
- Checking control panels
- Monitoring treated-water quality
- Replacing worn components
A preventive maintenance schedule can help reduce unexpected equipment failures.
How to Select a Biological STP Manufacturer in India
Before selecting a manufacturer, compare the complete technical and commercial proposal.
Check:
- STP capacity
- Treatment technology
- Equipment specifications
- Pump and blower details
- Biological media
- Automation
- Construction material
- Filtration
- Disinfection
- Installation scope
- Civil work
- Transportation
- Warranty
- After-sales service
- Spare parts
- Operating cost
- Maintenance requirements
- Documentation and certificates
This provides a more meaningful comparison than looking only at the initial price.
V AQUA Water and Wastewater Treatment Products
V AQUA provides several water and wastewater treatment solutions.
RO Plant
Commercial and industrial RO systems for applications requiring membrane-based water purification.
Water Softener
Ion-exchange softening systems designed to reduce water hardness.
Water Treatment Plant
WTP systems customized according to raw-water characteristics and required treated-water quality.
Effluent Treatment Plant
ETP systems designed for industrial wastewater based on the specific characteristics of the effluent.
Sewage Treatment Plant
Biological and other STP configurations for domestic sewage treatment.
Ultrafiltration System
UF membrane systems for suitable water and wastewater applications.
Why V AQUA for Biological Sewage Treatment?
V AQUA focuses on providing wastewater treatment solutions that combine:
Quality + Technology + Automation + Cost Efficiency + Customization
The company states that it has 20+ years of experience in the water treatment industry and focuses on customer satisfaction and sustainable wastewater treatment.
Its biological STP solutions can be customized for different capacities and applications while considering project-specific technical requirements.
Frequently Asked Questions About Biological STP
What is a biological sewage treatment plant?
A biological sewage treatment plant uses microorganisms to break down biodegradable organic matter in sewage and is commonly used for domestic wastewater treatment.
Which biological technology is used in STP?
Common technologies include MBBR, SBR, MBR, extended aeration, and activated sludge processes. The appropriate technology depends on project requirements.
What is the price of a 15 KLD biological STP?
The V AQUA 15 KLD STP Plant starts from approximately ₹5.92 lakh, subject to technology, specifications, installation, and other project requirements.
Can biological STP treated water be reused?
Yes. Depending on treated-water quality and applicable requirements, treated wastewater can potentially be reused for suitable non-potable applications such as gardening and flushing.
Is biological STP suitable for apartments?
Yes. Biological STPs are commonly used for domestic sewage generated by apartments and residential societies.
Does a biological STP require an operator?
Yes. Even automated biological STPs require monitoring, maintenance, cleaning, sludge management, and periodic servicing.
How long does a biological STP last?
System life depends on design, construction, equipment quality, operating conditions, maintenance, and replacement of individual components. V AQUA states a potential system life of approximately 20–32 years, subject to these factors.
Conclusion
A biological sewage treatment plant provides an effective approach to treating domestic wastewater by using microorganisms to break down biodegradable organic matter. It can be designed for residential societies, apartments, hotels, hospitals, institutions, commercial buildings, resorts, and industrial campuses.
Selecting the right technology, capacity, equipment, automation, and treatment configuration is essential for reliable long-term operation.
V AQUA WATER TREATMENT COMPANY provides biological, automatic, modular, and customized sewage treatment solutions across India. The company focuses on economical engineering, quality components, automation, documentation, and long-term wastewater management.
The V AQUA 15 KLD STP Plant starts from approximately ₹5.92 lakh, while larger capacities and customized systems can be quoted according to individual project requirements.
If you are looking for a biological sewage treatment plant manufacturer in India, V AQUA can provide a customized solution based on your sewage flow, wastewater characteristics, available space, required treated-water quality, and intended reuse application.
- Biological STP Manufacturer
- Biological Sewage Treatment Plant
- Biological STP Plant Manufacturer in India
- Sewage Treatment Plant Manufacturer in India
- Biological STP Plant Price
- Automatic Biological STP
- MBBR Sewage Treatment Plant
- SBR Sewage Treatment Plant
- MBR Sewage Treatment Plant
- STP Plant Manufacturer
- STP Plant Price in India
- 15 KLD STP Plant Price
- Industrial STP Manufacturer
- Commercial STP Manufacturer
- Apartment STP Plant
- Hotel STP Plant
- V AQUA STP Plant






Sewage Treatment Plant Manufacturer in Chennai
Sewage Treatment Plant Manufacturer in Kolkata | STP Plant Manufacturer