vabhav can you become my
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He can become your brother.
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please koi thanks dedo please....
Sludge is human waste (like faeces) in waste water left during sewage treatment. Since it is organic waste, it is used to produce biogas and manure. ... The biogas produced in the process can be used as fuel. After the aerator tank, microbes and human waste settle down and form activated sludge.
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