Journal of Environmental Biology
pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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Abstract - Issue Sep 2008, 29 (5) Back
Evaluation of specific biological heat potential of oily wastewater in an autothermal thermophilic aerobic treatment system
Jui Min Hung1, Chang Yu Chen2, Yeong Shing Wu3 and Chih Jen Lu*1
1Department of Environmental
2Department of Environmental
3Sinotech Engineering Consultants, Inc. Environmental
(Received: October 17, 2006; Revised received: May 26, 2007; Accepted: June 10, 2007)
Abstract: This study focuses on the specific biological heat potential (hb) of oil and grease wastewater in an autothermal thermophilic aerobic treatment (ATAT) system. A novel experimental device was applied to evaluate hb 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 hb 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 reactor operating temperatures at 43 oC and 48oC, 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.
Key words:??? Autothermal thermophilic aerobic treatment (ATAT), Specific biological heat potential, Oil and grease wastewater
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