Microbial effects on phosphorus release were studied for the sediments of Tianjin source water by controlling DO and pH. The results show that: (1) In sterilised water, phosphorus began to release when pH = 9.1 and the stable release rate was 9.51 mg/(d·m2). It indicates that microorganisms may utilise anaerobic iron respiration to release Fe-P. (2) With unsterilised water, phosphorus release rate is 2.14 mg/(d·m2) when pH = 6.5, 8.60 mg/(d·m2) when pH is uncontrolled, and gets to 8.51 mg/(d·m2) when pH = 9.1. This indicates that microorganisms can dissolve insoluble phosphates to accelerate the ion exchange of OH− and PO43−, which are derived from iron-bound ortho-P and aluminium-bound ortho-P.
Research Article|October 01 2008
Microbial effects on phosphorus release in aquatic sediments
Water Sci Technol (2008) 58 (6): 1285-1289.
Ting-Lin Huang, Xiao-Chun Ma, Hai-bing Cong, Bei-Bei Chai; Microbial effects on phosphorus release in aquatic sediments. Water Sci Technol 1 October 2008; 58 (6): 1285–1289. doi: https://doi.org/10.2166/wst.2008.459
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