Abstract:Ferric phosphate (FePO4) sludge, which is generated during the chemical phosphorus removal process in wastewater treatment plants, is the research object. The feasibility of phosphorous release from FePO4 using iron reducing bacteria (IRB) under anaerobic conditions was investigated. The effects of carbon source, C/Fe molar ratio and anthraquione-2, 6-disulfonate (AQDS) addition were studied. The results showed that IRB was enriched by acclimation of common activated sludge, and the insoluble ferric phosphate could be reduced by IRB. IRB could utilize glucose, sodium acetate, sodium propionate as the sole electron donor to reduce ferric phosphate and to generate Fe (Ⅱ) as well as to release phosphorus. The variation trend of Fe (Ⅱ) in the mixed liquor was consistent with the variation of phosphorus concentration in the supernatant. When glucose was used as carbon source, 51.6% of phosphorus was released, which was 13.8% and 20.3% higher than those released with sodium acetate and sodium propionate as the sole carbon source, respectively. When glucose was used as the carbon source and the C/Fe molar ratio was 5, the highest phosphorus release rate was achieved. With the addition of AQDS as electron shuttle, phosphorus release rate could be increased by 12.6%.
孙静, 李咏梅. 磷酸铁污泥的生物还原释磷及其影响因素研究[J]. 中国环境科学, 2015, 35(8): 2409-2416.
SUN Jing, LI Yong-Mei. Phosphorous release from sludge containing ferric phosphate using microbial reduction and the influencing factors.. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(8): 2409-2416.