The treated sewage of septic tank still impure, which means only 60 -70% of sewage get treated in septic tank. Also when a personal (domestic or commercial) sewage is not connected to the public sewage system then there is a need for septic tank to treat the sewage and those septic tanks are need to be drained using an equipment from public or private sewage cleaning sectors (although the septic tanks are fully water tight, there is a man hole for the cleaning purpose) unless it treated with soakage pit. As to overcome this sewage should be treated. These sewage produce environmental pollutions such as marine environmental distract, bad odour to the living environment, ground & surface water pollution and also many diseases. When we consider commercial or industrial sewage, a combination of domestic sewage and wastes of human harmful substances such as metal, hospital wastes, factory wastes are included in it. When we mention the domestic purpose sewage it refers to the human body wastes such as urine, faeces and wastes from bathroom/washroom/kitchen. ![]() ![]() Sewage is a collection of waste water from domestic purposes or commercial purposes or industrial purposes. Septic tank is the underground, onsite, small scale sewage treatment setup, which collects the sewage for the decomposition activity by bacterial action.
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