Anaerobic treatment of poultry mortality in a temperature-phased leachbed-UASB system.
Anaerobic digestion has been proposed as an alternative to the conventional disposal methods of burial, incineration, rendering and aerobic composting. A temperature-phased system consisting of one UASB (at 55 degrees C) and three leach-bed reactors (at ambient temperatures) was tested for its efficiencies in treating poultry mortality. The thermophilic UASB was difficult to start-up. It also showed signs of inhibited methanogenesis. Chemical parameters such as long chain fatty acids, volatile fatty acids and ammonia concentrations were all very high for the thermophilic UASB. Lowering its temperature to 35 degrees C enhanced its stability and improved its performances. Lowering the pH of the 55 degrees C UASB also improved its chemical oxygen demand (COD) reduction efficiency as well as its methane production rate. The results were compared to that of another similar system where the UASB reactor was maintained at 35 degrees C instead of at 55 degrees C.
Chen
Ten-Hong
TH
Department of Bio-industrial Mechatronics Engineering, National Chung Hsing University, Taichung, Taiwan 40227, ROC. thchen@dragon.nchu.edu.tw
Huang
Jiun-Lin
JL
D000818:Animals; D001421:Bacteria, Anaerobic; D019149:Bioreactors; D001831:Body Temperature; D002645:Chickens; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D008697:Methane / Q000737:chemistry; D010100:Oxygen / Q000378:metabolism; D012722:Sewage; D013696:Temperature; D014865:Waste Disposal, Fluid; D018508:Water Purification
D007220:Industrial Waste; D012722:Sewage; D008697:Methane; D010100:Oxygen