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| Influence of application of bio-energizer to sediment microbial community and the content of nitrogen and phosphorus element |
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Abstract Indoor static experiment was conducted to investigate the change Law of nitrogen and phosphorus in the sediments and overlying water under different characteristics of microbial community by adding bio-energizer. The results showed that sediment microorganisms had important influence on the effect of river restoration. With the addition of BE, sediment microbial FDA activity and diversity increased by 36.4% and 5.1% respectively against to the groups of untreated. The increase of microbial activity and diversity contributed to the assimilation of N and P contained and the degradation of TOC. The degradation degree of TOC in the sediment which reached 13.7% was higher than the untreated group observably(P background value> the group of untreated. Under the condition of bio-energizer addition, the ammonia nitrogen and phosphate release quantity Lower than untreated group, but COD release quantity was 25.5g higher than untreated group with 17.0g. Sediment microbial community was the main factor to promote the transformation cycle of nitrogen and phosphorus. The increase of microbial activity and diversity in the sediment had actively effects on the fixation of nitrogen and phosphorus and enhanced the ability of self-purification.
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Received: 30 June 2013
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