Sewage Treatment Plant (STP)
Sewage Treatment Plant (STP)
Sustainable Wastewater Treatment for Residential, Commercial & Industrial Applications
A Sewage Treatment Plant (STP) is a vital system used to treat wastewater generated from domestic, commercial, and institutional activities. At Purlieus Inc., we provide advanced and reliable STP solutions designed to treat sewage effectively, reduce pollution, and promote sustainable water reuse practices. Our plants comply with all CPCB and SPCB standards, ensuring clean and safe effluent discharge.
What Is a Sewage Treatment Plant (STP)?
A Sewage Treatment Plant (STP) processes domestic wastewater—commonly known as sewage—to remove contaminants, organic matter, and harmful microorganisms. The treated water can be reused for non-potable applications or safely discharged into the environment.
STPs help in:
Protecting water bodies
Reducing environmental pollution
Conserving freshwater resources
Meeting statutory pollution norms
How Our STP System Works
Our STP solutions use a combination of physical, chemical, and biological processes to treat sewage with high efficiency.
1. Preliminary Treatment
Screening
Grit removal
Oil & grease trap
2. Primary Treatment
Sedimentation tank
Removal of suspended solids
3. Secondary (Biological) Treatment
Aeration / MBBR / SBR / MBR
Biological degradation of organic impurities
4. Tertiary Treatment
Filtration
UV / Chlorination disinfection
Activated carbon polishing
5. Sludge Management
Sludge thickening
Dewatering
Safe disposal
Key Features of Our STP Systems
Fully automatic or semi-automatic operation
Energy-efficient blowers and pumps
Compact & modular designs
Low maintenance & long service life
Odour-free and silent operation
Remote monitoring (SCADA/PLC optional)
Treated water reusable for flushing, gardening, cooling tower, etc.
Frequently Asked Questions
A Sewage Treatment Plant (STP) is a system designed to treat domestic and commercial wastewater (sewage) and remove contaminants such as solids, organic matter, and harmful microorganisms. It ensures that the water becomes safe for discharge into the environment or for non-potable reuse.
An STP works through multiple stages including:
Primary Treatment – Removal of large solids and settleable particles
Secondary Treatment – Biological process to reduce BOD & COD
Tertiary Treatment – Filtration, disinfection (UV/Chlorination), and polishing
This multistage process ensures high-quality treated water that meets environmental standards
Common STP technologies include:
Activated Sludge Process (ASP)
Moving Bed Biofilm Reactor (MBBR)
Sequential Batch Reactor (SBR)
Membrane Bioreactor (MBR)
Each technology is selected based on sewage load, space availability, budget, and treatment quality required.
Yes, treated sewage water can be reused for various non-potable applications such as:
Gardening & landscaping
Toilet flushing
Cooling towers
Construction activities
Washing & cleaning
Reusing treated water reduces fresh water consumption and promotes sustainability.
Installing an STP offers several advantages:
Ensures compliance with environmental regulations
Reduces pollution and protects water bodies
Saves water through reuse
Enhances sustainability for residential, commercial, and industrial facilities
Helps maintain hygiene and public health