Evaluation of specific biological heat potential of oily wastewater in an autothermal thermophilic aerobic treatment system.
This study focuses on the specific biological heat potential (h(b)) of oil and grease wastewaterin an autothermal thermophilic aerobic treatment (ATAT) system. A novel experimental device was applied to evaluate h(b) by using heat balance model under steady state. In the study the treatment system was daily fed with realistic and artificial wastewater at 11250 and 17420 mg COD l(-1), respectively. The wastewater was rich in oil and grease at 1220 and 600 mg l(-1), respectively. The sludge retention time (SRT) was controlled at 5 days. The results showed that the average values of h(b) were 3.7 and 3.1 kcal g(-1) COD removed and the true growth yield (Y0) were 0.10 and 0.13 mg MLSS mg(-1) COD for realistic and artificial wastewater respectively. These two systems could maintain reactoroperating temperatures at 43 degrees C and 48 degrees C, respectively. The COD removal efficiency was as high as 90 to 97%. The oil and grease reduction was 68 to 72%. The high organic matter removal capacity and low sludge yield of ATAT process have been demonstrated.
Hung
Jui Min
JM
Department of Environmental Engineering, National Chung Shing University-402, Taiwan.
Chen
Chang Yu
CY
Wu
Yeong Shing
YS
Lu
Chih Jen
CJ
D001420:Bacteria, Aerobic / Q000378:metabolism* / Q000502:physiology; D001673:Biodegradation, Environmental; D019149:Bioreactors; D006358:Hot Temperature; D007700:Kinetics; D009821:Oils / Q000737:chemistry* / Q000378:metabolism; D012722:Sewage / Q000737:chemistry*; D018508:Water Purification
D009821:Oils; D012722:Sewage