Wastewater is polluted water generated from rainwater runoff and human
activities. It is also called sewage and is categorized as domestic, industrial,
or storm wastewater.
Wastewater originates from homes, offices, industries, farms, transport systems,
mines, and fuel depots. Domestic wastewater comes from toilets, kitchens, and
laundries, while industrial wastewater comes from manufacturing processes.
Wastewater treatment removes toxic elements and pollutants from water to protect
human health and ecosystems. It prevents waterborne diseases, protects aquatic
life, and reduces environmental pollution.
The wastewater treatment process includes screening, grit removal, primary
settling, aeration, secondary settling, filtration, disinfection, oxygen uptake,
and sludge treatment to produce clean and safe water.
Wastewater treatment includes physical, biological, chemical, and sludge
treatment processes. These methods remove solids, organic matter, harmful
chemicals, and pollutants from wastewater.
Primary treatment removes floating and settleable solids through screening, grit
removal, and sedimentation. It helps reduce the load on further treatment
processes.
Sludge is the solid or semi-solid residue produced during wastewater treatment.
It includes primary and secondary sludge and must be treated before disposal.
Sludge is disposed of through landfills, land application, incineration, or
liquid injection. Treatment reduces volume and stabilizes organic matter before
disposal.
Aeration supplies oxygen to wastewater, supporting microorganisms that break down
pollutants and improving the efficiency of the treatment process.
Wastewater treatment removes pollutants and harmful substances, restores oxygen
levels, and ensures safe water discharge, protecting rivers, lakes, and
ecosystems.