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What Is A Sewage Treatment Plant And How Does It Work


Sewage is wastewater that contains high amounts of organic and inorganic solids from various establishments such as commercial, industrial or residential, etc. 

What is a Sewage Treatment Plant (STP)?

A Sewage Treatment Plant (STP) treats the sewage produced from various establishments to make it safe for disposal. 

It performs physical, chemical, and biological processes to remove contaminants and produce treated wastewater that is safe enough to dispose of into the environment. A by-product of sewage treatment is a semi-solid waste called sewage sludge. The sludge further undergoes treatment before being suitable for disposal or application to land.

Why do we need a STP Water Treatment Plant?

It is essential to clean and treat the sewage wastewater before it enters the natural environment. If sewage is disposed into the water sources without treatment, it will contaminate them, kill living organisms, and produce diseases.

Commercial and industrial establishments are required to treat their sewage based on set quality standards before discharging to the sewer. For this purpose, a sewage treatment plant is installed at the vicinity to eliminate harmful contaminants before disposing it into the environment.

How does a STP Plant Work?

An STP plant works in four different stages:

1. Preliminary treatment

Initially, the wastewater goes through the process where most coarse solids are removed by large filtering screens that help remove solid objects.

2. Primary treatment

Next, the sewage passes to the primary treatment, where heavy solids sink to the bottom and only the lighter solids, oil and grease float on the surface. The settled solids and floating materials are removed. The remaining wastewater may be discharged or moved to secondary treatment.

3. Secondary treatment

The secondary phase removes dissolved and suspended biological matter from wastewater. Secondary treatment is performed by indigenous and water-borne micro-organisms like bacteria and protozoa which consume biodegradable soluble contaminants like sugar, fat, detergent, and food waste. It requires a separation process for removing the micro-organisms from treated water prior to discharge or tertiary treatment.

4. Tertiary treatment 

In this final stage, the water goes to filtration again to remove any more waste if found lingering from the secondary treatment. The wastewater is then disinfected chemically which filters the water completely before releasing it to the natural environment.

Read More : SBR Semiautomatic STP 1 KLD

Benefits of a Sewage Treatment Plant

1. Proven technology which offers reliable performance

2. Preserves natural environment against contamination and pollution

3. Helps to meet the standards for emission of pollutants set by the Government and avoid heavy penalty

4. Simple and easy to install

5. Requires Low maintenance 

6. Reduces risk to public health and the environment

STP Plant of Pearl Water

Pearl Water Technologies offers premium quality and ISO-certified STP plant in India and abroad trusted by various industries and residential complexes. We have a range of STPs suitable for all sizes of establishments. Our STP plants are of following types:

>M.B.B.R (Moving Bed Biofilm Reactor) Semi-Automatic STP

>S.B.R (Sequencing Batch Reactor) Semi-Automatic STP

>M.B.R (Membrane bioreactor) Semi-Automatic STP

Buy Now M.B.R Semi-Automatic STP 10kld

Our STP plants are highly reliable with improved performance. We are the best Sewage Treatment Plant manufacturer across Delhi/NCR. We customized the plants according to customer needs. We MBBR STP, SBR STP, SBR STP.Our main aim is to provide Quality products to our all clients at best price in Industry.


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