SLAUGHTERHOUSE WASTEWATER TREATMENT BY ANAEROBIC FIXED FILM FIXED BED REACTOR PACKED WITH SPECIAL MEDIA
Most of the slaughterhouses in Nagpur city do not have any proper effluent treatment facilities. Hence, a study was undertaken to assess the feasibility of anaerobic treatment of slaughterhouse wastewater in an anaerobic fixed film fixed bed reactor packed with specialized ultraviolet stabilized media matrix. This media matrix provides surface area of 400m2/m3 which is much more than the other conventional media. These anaerobic fixed film reactors are more favoured due to its capacity to withstand high organic loading and short retention time. Slaughterhouse wastewater was collected from a local medium scale slaughterhouse where a total of 300 bovines are slaughtered per day. Wastewater was collected on hourly basis for six hours (till slaughtering process was going on) and a combined and homogenised wastewater was prepared. This combined wastewater was settled for half an hour to remove suspended solids before feeding it to the anaerobic reactor. Study was evaluated to see the performance of the upflow fixed film fixed bed reactor at various organic loading rates varying between 0.8 – 3.2 kg COD/m3/day at two different HRT’s of one and two days. COD and BOD reductions varied between 85.4 – 91.8% and 87.4 – 93.2% respectively at one day HRT while it varied between 87.0 – 93.5% and 89.2 – 95.8% respectively at two days HRT. Corresponding biogas production varied between 0.196 – 0.295m3/kg COD added and 0.263 – 0.332m3/kg COD added for one day and two days HRT respectively. It is seen from the results that as the HRT increased, gas production also showed increased trend. Gas composition indicated methane content in the range of 65 – 67%.