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The Sewage treatment plant (STP) is used onboard to treat and disinfect the sewage generated on ships before discharging overboard into the sea. It is very important machinery on a ship in respect to environmental and Marpol regulations.
The STP mainly consists of three chambers –
There are two types of bacteria used in the sewage treatment plant
The coliform is a kind of organism which holds a chunk of the human intestine and is acknowledged as “INDICATOR ORGANISMS OF SEWAGE POLLUTION”
The presence of these organisms in water is an indication of “Pathogen” which is a disease-causing bacteria responsible for Cholera, Dysentry, Typhoid etc.