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Research Article
ScienceAsia 29 (2003): 365-370 |doi: 10.2306/scienceasia1513-1874.2003.29.365
Effect of Temperature Shock on Activities of Phosphorus-accumulating Organisms
Thongchai Panswada, Apiradee Doungchaia and Jin Anotaib,*
ABSTRACT: Four anaerobic-aerobic sequencing batch reactors with 9-day of sludge age were operated under a
12-hour cycle of 5, 290, 360, 60, and 5 minutes for the filling, anaerobic, aerobic, settling, and withdrawal
periods, respectively. The results indicated that increasing temperature from the phosphate-accumulating
organisms (PAOs) preferred temperature of 20oC by either pulse (5oC after every 5 days) or step (1oC per
day) manner had negative impacts on the PAOs’ activities, particularly on the aerobic phosphorus uptake.
However, the pulse-increase scenario, especially from 30 to 35oC, caused more severe impacts than the stepincrease
scenario. On the contrary, the shock in a decreasing manner regardless of experimental scenarios
gave positive impacts on the PAO’s activities in both anaerobic phosphorus release and aerobic phosphorus
uptake. Hence, operators of the enhanced biological phosphorus removal (EBPR) plants should be cautious
when the weather becomes abruptly warmer due to seasonal variation or heat wave. Certain actions including
external carbon supplement, sludge age alteration, or other phosphorus removal alternatives may be needed
in order to maintain the performance of the EBPR system.
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a Department of Environmental Engineering, Chulalongkorn University, Bangkok 10330, Thailand.
b Department of Environmental Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand.
* Corresponding author, Email: jin.ano@kmutt.ac.th
Received 21 May 2003, Accepted 15 Sep 2003
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