Anaerobic bio filter systems to have the best yield of biogas with the treatment of piggery wastewater

摘要

Animal husbandry is a leading food supplying industry for the mankind. Wastewater generation from animal husbandry is a real environmental threat for many countries. Piggery wastewater with high Chemical Oxygen Demand (COD is between 8000 to 15000 mg/lt) is having a very high potential of biogas production, under anaerobic condition. This research was based upon the fixing of series of Up flow Anaerobic Floating Filters (UAFF),to catch a maximum yield of biogas from piggery wastewater, with better wastewater treatment facility. These experiments achieved more than 90% of removal of Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD) and Suspended Solids (SS) for piggery wastewater. Average volumetric biogas yield was reached up to 186-liters/ m3.day, but this is not significant. However environmental benefits achieved via wastewater treatment techniques, are significant in these experiments. Central Environmental Authority (CEA) of Sri Lanka has already monitored the parameters of the treated wastewater with this treatment system, and satisfactory levels were ensured. A few private farmers for animal husbandry in Sri Lanka, are now practicing this system satisfactorily as a good start for a long journey towards the prospects of biogas energy, with a clean farm environment.