期刊
ENVIRONMENTAL TECHNOLOGY
卷 33, 期 2, 页码 237-245出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2011.563428
关键词
activated sludge; denitrifying phosphorus accumulating organisms; denitrifying phosphorus removal
资金
- Ministry of Science
- University Education (Poland)
- [N207 018 31/1002]
The objective of this study was to establish such operating conditions in a sequencing batch reactor (SBR) that will enable the achievement of the highest possible share of denitrifying P removal in nutrient elimination. Two different operating strategies for SBRs were analysed. Both of these strategies used a forced anoxic phase in the SBR treatment cycle. The first one was based on an intermittent aeration, which led to periodic occurrence of anoxic conditions when the uptake of P-PO43- could occur. The second strategy was based on mimicking the A(2)O process and forcing an anoxic phase straight after an anaerobic phase. The experiments were performed in a laboratory reactor operating at a maximum fill of 26.8-27.7 litres and a constant temperature of 18 degrees C. It was found that a SBR configuration with intermittent aeration did not allow the achievement of significant denitrifying P removal, despite the DPAO/PAO ratio being equal to 50.5%. Almost the entire load of orthophosphates was being removed in aerobic conditions right after the anaerobic phase, even though this aerobic period lasted only 20 minutes. However, a SBR with a forced anoxic phase occurring after an anaerobic phase and created by an introduction of NOx rich stream of wastewater guaranteed the highest DPAO/PAO ratio of 82.8% and the highest share of denitrifying P removal (above 80%) in the total removal of phosphorus.
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