Investigation of anaerobic side-stream phosphorus recovery and its effect on the performance of mainstream EBPR subjected to low-consumption

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Juan MaYongzhi Chen

Abstract

In this study, phosphate-rich supernatant at the end of anaerobic phase was extracted by a certain side-stream ratio for chemical precipitation to investigate the optimal conditions for phosphorus recovery. The effect of side-stream reaction on the performance of the mainstream enhanced biological phosphorus removal (EBPR) system was also explored. The experiment was carried out in a sequencing batch reactor (SBR) operated in an alternating anaerobic/aerobic mode with dissolved oxygen controlled at 1.0 mg · L-1. The results showed that the optimum magnesium source,temperature, stirring speed and reaction equilibrium time for side-stream phosphorus recovery were: MgCl2 · 6H2O, 25 °C, 150 rpm and 20 min, respectively. It was also observed that the average phosphorus removal efficiency of the mainstream system maintained as high as 90.7% during the side-stream extraction period despite insufficient time for phosphate uptake under limited dissolved oxygen condition and phosphate deprivation of polyphosphate-accumulating organisms (PAOs). Besides, the sludge settling performance of the mainstream EBPR system decreased with no sludge loss. Afterwards, phosphorus removal and sludge settling performance were restored with dismissing si...Continue Reading

References

Jan 17, 2002·Water Research·I StratfulJ N Lester
Jun 5, 2002·Water Research·Y JafferS A Parsons
Apr 12, 2006·Water Science and Technology : a Journal of the International Association on Water Pollution Research·X D Hao, M C M van Loosdrecht
Mar 8, 2011·Chemosphere·Bruce E RittmannMark Edwards
May 2, 2013·Environmental Science & Technology·Guoqiang Liu, Jianmin Wang

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