Effect of Sludge Retention Time on Behavior of the Acinetobacter spp.
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Abstract
The aim of this project is to study effect of sludge retention time on behavior of the phosphorus accumulating organisms (PAOs) in enhanced biological phosphorous removal (EBPR) processes. Anaerobic-anoxic-aerobic conditions were combined in the EBPR process with acetic acid as a carbon source for synthetic wastewater through 20-day and 60-day SRT. The results revealed that the PAOs in EBPR were Acinetobacter baumannii and Acinetobacter spp. in both SRT 20 and 60 days. The activity of PAOs in anaerobic conditions resulted ortho-P released and uptake of ortho-P in an anoxic and aerobic conditions at 60 days SRT was higher than that of 20 days, those equal to 1.66 and 1.57 times, respectively. The paired t-test of total phosphorus (TP) removal showed a significant difference between SRT 20 and 60 days (p <0.05). The SRT of 60 days was 1.23 times higher than that of the 20-day SRT where the efficiency of total phosphorus removal was 65.69 % in SRT 60 days and 53.26 % in SRT 20 days. Total nitrogen (TN) and total chemical oxygen demand (TCOD) removals were significantly different under SRT 20 and 60 days (p <0.05). The removal efficiencies of TN and TCOD reached the average more than 98.67 %. It was concluded that 60-day SRT was more effective to remove TP TN and TCOD than 20-day SRT, because the amount of PAOs increased in 60 days SRT and the observed phosphate released in anaerobic conditions. Eventually, the amount of PAOs affects the efficiency of phosphorus removal. This result can be referred as a guideline to control the EBPR system specifically in wastewater treatment systems around Thailand.
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References
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