污水氮浓度对粉绿狐尾藻去氮能力的影响

发布时间：2018-03-16 05:02

本文选题：粉绿狐尾藻　切入点：污水　出处：《环境科学》2017年03期 　论文类型：期刊论文

【摘要】：粉绿狐尾藻是构建人工湿地的重要植物,对污水具有较强的净化作用,但有关其去氮能力及其与污水氮浓度的关系尚不清楚.本试验采用人工模拟盆栽试验,设2、5、10、20、100、200、400 mg·L~(-1)共7个氮水平,研究污水氮浓度对粉绿狐尾藻去氮能力的影响.结果表明,氮浓度不高于20 mg·L~(-1)时,前3周粉绿狐尾藻以20 mg·L~(-1)生长最好,处理1周水体总氮和氨氮的去除率接近100%,而硝态氮浓度低、变化不大;粉绿狐尾藻氮含量因氮浓度变化不大但部位间有"上高下低"趋势,且粉绿狐尾藻还利用了底泥氮.氮浓度100~400 mg·L~(-1)时,4~5周以氮浓度200 mg·L~(-1)粉绿狐尾藻生长最好;处理5周总氮去除率依次为76.5%、71.5%和48.1%,氨氮去除率依次为99.6%、99.3%和60.2%;各处理硝态氮去除率约为50%且处理间差异不大;粉绿狐尾藻氮含量随氮浓度而升高,但部位间差异小、呈均匀分布;粉绿狐尾藻积累氮、底泥固定氮分别占水体去除氮的27.9%~48.4%和12.2%~24.4%.因此,粉绿狐尾藻去氮能力受污水氮浓度的显著影响,去除氨氮率显著高于硝态氮;氮浓度还影响粉绿狐尾藻对氮的吸收积累和分配机制,值得深入研究.
[Abstract]:As an important plant in the construction of constructed wetland, P. farinosa has a strong purifying effect on sewage, but its nitrogen removal ability and its relationship with nitrogen concentration in sewage are not clear. A total of 7 nitrogen levels were set up at a concentration of 200 mg 路L ~ (-1) ~ (-1). The effects of nitrogen concentration in sewage on the nitrogen removal capacity of P. farinosa were studied. The results showed that the best nitrogen concentration was 20 mg 路L ~ (-1) in the first 3 weeks when the nitrogen concentration was not higher than 20 mg 路L ~ (-1), and the results showed that the best nitrogen level was 20 mg 路L ~ (-1) in the first 3 weeks, when the nitrogen concentration was not higher than 20 mg 路L ~ (-1). The removal rate of total nitrogen and ammonia nitrogen was close to 100, but the nitrate concentration was low, and the nitrogen content of algal alga was not changed because of the little change of nitrogen concentration, but there was a trend of "high and low" between the parts. In addition, the bottom sediment nitrogen was also used. The best growth rate was 200 mg 路L ~ (-1) N concentration for 5 weeks when the nitrogen concentration was 100 ~ 400 mg 路L ~ (-1) 路L ~ (-1), and the concentration of nitrogen was 200 mg 路L ~ (-1) for 5 weeks. The removal rate of total nitrogen was 71.5% and 48.1%, respectively, and the removal rate of ammonia nitrogen was 99.6 ~ 99.3% and 60.2%, respectively, the removal rate of nitrate nitrogen was about 50% and there was no significant difference between the treatments, and the nitrogen content increased with nitrogen concentration, but the difference was small and distributed evenly. The nitrogen accumulation of P. farinosa was significantly affected by the concentration of nitrogen in sewage, and the removal rate of ammonia nitrogen was significantly higher than that of nitrate nitrogen, and the nitrogen removal capacity was significantly affected by the concentration of nitrogen in the wastewater, and the fixed nitrogen in the sediment accounted for 48.4% and 12.2% of the nitrogen removal in the water, respectively. Nitrogen concentration also affects the mechanism of nitrogen absorption, accumulation and distribution, which is worthy of further study.
【作者单位】：华中农业大学资源与环境学院;新型肥料湖北省工程实验室;中国科学院亚热带农业生态研究所;
【分类号】：X703

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