Sewage Treatment Plant

Sewage Treatment Plant offered by our company is extensively appreciated by the customers. The primary source of micropollutants, such as pharmaceuticals and personal care products, is sewage treatment plants (STPs) (PPCPs). In order to maximize the deterioration of micropollutants at the discharge source and reduce their concentrations and related biological effects, it is crucial to understand the biotreatment processes of household and hospital municipal wastewater.

sewage treatment plant or STP: Sewage treatment is defines as the process of removing the harmful pollutants or contaminants from sewage from commercial, residential and industrial sources to produce liquid and solid which is suitable for discharge into the environment or for reuse. 

What kind of treatment methods involved in STP?

Commercial package sewage treatment plant includes physical, chemical and biological methods.

• Physical method: It consists of sedimentation, screening, filtration, skimming and etc.
• Chemical method: It consists of chlorination, neutralization, coagulation, etc.
• Biological method: It consists of aerobic (activated sludge process, tricking filters, oxidation pond, aerated lagoons, aerobic digestion etc.,) and anaerobic (anaerobic digestion, septic tanks etc.,) processes.

• It involves both aerobic and anaerobic biological treatment where aerobic process called activated sludge process is the most commonly used process to reduce organic material.
• Waste water flows from primary tank will enter into aeration tank to which air is supplied to increase the growth microorganisms like bacteria to break down organic matter.
• Now aerated wastewater (solids + microorganisms) enter into secondary clarifiers in which heavier solids settle to the bottom of the clarifiers which is called as secondary sludge.
• Some of the sludge will be redirected to aeration tank for further processing and remaining mixes with primary sludge for sludge digestion process and then disposed off or reused.
• This stage ensures about 80-85% of organic matter are removed.

Tertiary or advanced treatment:

• This is highest or final treatment level in most of the Sewage Treatment Plants (STP).
• The main objective of this treatment level is to produce better quality effluent which was not obtained during previous levels.
• Depending on the quality of the effluent it involves physical or chemical or biological methods to remove left over suspended and dissolved solids.
• It involved disinfection process to remove residual microorganisms from wastewater before its discharge or reuse.
•  Disinfection is done by using disinfectants like chlorine, ozone, UV light and many such and now treated wastewater called effluent is suitable for discharge into the environment or reuse.