Best Innovation Technologies

Physical, chemical, and biological processes are used to remove contaminants and produce treated wastewater (or treated effluent) that is safe enough for release into the environment. A by-product of sewage treatment is a semi-solid waste or slurry, called sewage sludge.

The sewage (combination of black water and grey water) is treated by the home sewage treatment plant which involves following steps:
Primary treatment is the first stage in domestic sewage treatment plant, in which material such as grit, dirt, grease and all floating items present in sewage are removed. Grit removed from primary settler flows to grit chamber for storage. Secondary treatment is done in biological process to break down organic matter from human beings, in the liquid part of the sewage. When flow enters the secondary sedimentation tank, secondary sludge obtained during this step is combined with primary sludge for sludge processing. 80-90% of human waste and other solids are removed after this stage.In the tertiary stage of domestic wastewater treatment plant specific organic constituents, including phosphates, nitrates and ammonia are removed. Sometimes it will also be treated with a disinfection process using UV light, chlorination or ozone treatment to remove bacteria and viruses.