SOLID AND LIQUID STATE BIOMETHANATION OF PAPER, TANNERY AND DAIRY WASTES

This work discusses the perspectives of treating industrial waste effluents and sludge through anaerobic digestion as well as utilization of this effluent for the production of biogas. In this study it was emphasized the production of biogas using industrial waste material like paper industry, tannery and dairy industry during the period of March to November 2014 at PCSIR Laboratories Complex, Lahore Pakistan. Several factors determined especially biological oxygen demand (BOD), chemical oxygen demand (COD), pH, TDS, TSS, conductivity, digester height, Temperature and humidity. The pH values were 7.9, 8.0, 9.0, the range of ambient temperature was 26-34^oC, humidity of the digester was 21-49%, BOD (3666.7mg/l) and COD also same (3666.7 mg/1) C/N ratio of paper waste was 2012:0.675. Results indicated that the BOD of the fleshing material was 26820mg/l and COD 74600mg/l. Similarly, the BOD of sludge waste was 29973mg/l, 89919 mg/l respectively. C/N ratio of sludge waste was 2012:0.675. Effect of co-digestion of cow dung waste on biogas production from industrial effluents and sludge was also investigated. The wastes were prepared as paper waste, Tannery and dairy wastes (25% cow dung and 75% effluent, 50% cow dung and 50% effluent, 75% cow dung and 25% effluent and in control only cow dung vice versa). Maximum biogas production (0.899 m³) was observed in case of tannery sludge material when added in digester in the ratio of 25:75 and minimum in case of tannery sludge (0.014 m3 in the ratio of 25:75).