投加生物促生剂对底泥微生物群落及氮磷的影响

Influence of application of bio-energizer to sediment microbial community and the content of nitrogen and phosphorus element

采用室内静态试验,考察投加生物促生剂(BE)时,底泥微生物群落特征变化规律,进而分析其对底泥氮磷元素迁移转化的影响,以期为河道生态修复提供理论支持.结果表明:底泥微生物对河道修复效果有重要影响.相对于未处理组,投加BE情况下,底泥微生物FDA活性和Shannon指数分别提高了36.4%和5.1%.底泥微生物活性及多样性的升高有助于TOC的降解及氮磷元素的同化.投加BE情况下,底泥TOC降解率达到13.7%,显著高于未处理组(P<0.01);底泥全氮、全磷的含量从大到小分别为投加生物促生剂组>背景值>未处理组.投加生物促生剂时氨氮、磷酸盐释放量低于未处理组,但COD释放量为25.5g高于未处理组的17.0g.底泥微生物群落是推动氮磷循环转化的主要因素.微生物群落活性及多样性的升高有助于氮磷元素的固定以及河道自净能力的提高,增强其对外来氮磷污染的耐冲击能力.

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<0.01),while the sediments treated by BE. Meanwhile, the order of sediments nitrogen and phosphorus content was the group adding with BE> 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.