At the Tata plant in Mithapur, effluent is taken to huge mud trenches, effluent-settlement ponds, which cover about 243 ha. The liquid is supposed to go to the sea from here after suspended solids in it settle down. According to the Consent to Operate given to the company in 2004, ponds marked S,T,U, V,W,X were in use, implying 18 ponds--A to R--have already been filled up with solids. Effluent discharged into the ponds was seen to emit thick vapour while the dried up ponds had huge biscuit-like chunks to its brim. GPCBand the company say this method is universally acceptable.
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