Microbial effects on phosphorus release in aquatic sediments.
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 PO4(3-), which are derived from iron-bound ortho-P and aluminium-bound ortho-P.
Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture & Technology, Xi'an, Shaanxi, P.R. China. huangtinglin@xauat.edu.cn
Ting-Lin
TL
Huang
Xiao-Chun
XC
Ma
Hai-bing
HB
Cong
Bei-Bei
BB
Chai
D019149:Bioreactors / Q000382:microbiology*; D019015:Geologic Sediments / Q000382:microbiology*; D006863:Hydrogen-Ion Concentration; D010758:Phosphorus / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
D014874:Water Pollutants, Chemical; D010758:Phosphorus