What is sewage treatment plant??
Answers
Sewage treatment is the process of removing contaminants from municipal wastewater, containing mainly household sewage plus some industrial wastewater. Physical, chemical, and biological processes are used to remove contaminants and produce treated wastewater that is safe enough for release into the environment
Answer: Hi! Hope you get cleared of doubts about sewage treatment plan.
Human health and environment are mainly affected by the direct disposal of industrial and human effluents into natural resources without any treatment. Sewage treatment is necessary to reduce the toxicity of sewage and maintain a safe and healthy environment, as well as promote human welfare.
Explanation:
- SCREENING:
here the wastewater is first sent screening (vertical bars) here the plastic objects, sticks are all removed. Then the water is sent to grit removal chamber, here the sand, slit and gravel settle down which are removed.
- Primary treatment:
Water is then allowed to settle in a tank (Clarifier) where solids like faeces (called sludge) settle at the bottom and are removed with a scraper. A skimmer removes the floatable solids like oil and grease. Water so cleared is called clarified water. Sludge is used to produce biogas.
- secondary treatment:
Secondary treatment (mostly biological wastewater treatment) is the removal of biodegradable organic matter (in solution or suspension) from sewage or similar kinds of wastewater. The aim is to achieve a certain degree of effluent quality in a sewage treatment plant suitable for the intended disposal or reuse option. A "primary treatment" step often precedes secondary treatment, whereby physical phase separation is used to remove settleable solids. During secondary treatment, biological processes are used to remove dissolved and suspended organic matter measured as biochemical oxygen demand (BOD). These processes are performed by microorganisms in a managed aerobic or anaerobic process depending on the treatment technology. Bacteria and protozoa consume biodegradable soluble organic contaminants (e.g. sugars, fats, and organic short-chain carbon molecules from human waste, food waste, soaps and detergent) while reproducing to form cells of biological solids. Secondary treatment is widely used in sewage treatment and is also applicable to many agricultural and industrial wastewaters.
- Disinfection:
now the water is 95% clean, now it is sent to a UV tank, where it is disinfected of germs, bacteria, and is added chlorine to make it almost as clean as possible.