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Abstract
Treatability studies were carried out for the treatment of cotton digestion wastewater consisting high pH, BOD and COD. The wastewater was found to be amenable to anaerobic treatment as the BOD to COD ratio is found to be around 0.49 (COD, 5000 mg/L, BOD, 2700 mg/L). Specific biogas yield was observed to be 0.44 to 0.48 m3 CH4/kg COD removed for 2.0 day and 1.5 days detention time respectively. It is estimated that about 400 m3/d of biogas with 67% methane content can be obtained from 200 m3/d of wastewater treatment. This biogas can be utilized to partially meet the fuel requirement of the complex and results in the saving to the tune of 2.8 lakhs per annum.