Microbial Effects on Phosphorus Release from Sediments on the Multi-phase Interface of Water Sediment-Biofacies
Microbial effects on phosphorus release from sediments on the multi-phase interface of water-sediment-biofacies were investigated based on a series of test by a comparison method of sterilization and non-sterilization in simulated water-sediment reactors. Phosphorus release was analyed using the sediment from Fenhe Reservoir through parallel experiments under different conditions of aerobic, anaerobic and addition of reducing agents. The experimental results showed that endogenous phosphorus and ferrous seldom released from the sediment under aerobic condition. Due to the decrease of surrounding oxidation-reduction potential (ORP) caused by activities of microorganisms, which took sulphate radical as their electronic acceptor, a great significant release of phosphorus and soluble ferrous from the sediment took place under the anaerobic condition. Under anaerobic condition, only after the strong reductant was added into the sterilized reactor (without live microorganism) to lower ORP to the same level as in the non-sterilized reactor, could the endogenous phosphorus and soluble ferrous significantly release from the sediment. And it wag also found that the Fe-P and 0-P activated by the microorganism in the sediment more easily release under the anaerobic condition.
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