發(fā)布時間：2018-03-16 05:02

  本文選題：粉綠狐尾藻　切入點：污水　出處：《環(huán)境科學》2017年03期 　論文類型：期刊論文

【摘要】：粉綠狐尾藻是構(gòu)建人工濕地的重要植物,對污水具有較強的凈化作用,但有關其去氮能力及其與污水氮濃度的關系尚不清楚.本試驗采用人工模擬盆栽試驗,設2、5、10、20、100、200、400 mg·L~(-1)共7個氮水平,研究污水氮濃度對粉綠狐尾藻去氮能力的影響.結(jié)果表明,氮濃度不高于20 mg·L~(-1)時,前3周粉綠狐尾藻以20 mg·L~(-1)生長最好,處理1周水體總氮和氨氮的去除率接近100%,而硝態(tài)氮濃度低、變化不大;粉綠狐尾藻氮含量因氮濃度變化不大但部位間有"上高下低"趨勢,且粉綠狐尾藻還利用了底泥氮.氮濃度100~400 mg·L~(-1)時,4~5周以氮濃度200 mg·L~(-1)粉綠狐尾藻生長最好;處理5周總氮去除率依次為76.5%、71.5%和48.1%,氨氮去除率依次為99.6%、99.3%和60.2%;各處理硝態(tài)氮去除率約為50%且處理間差異不大;粉綠狐尾藻氮含量隨氮濃度而升高,但部位間差異小、呈均勻分布;粉綠狐尾藻積累氮、底泥固定氮分別占水體去除氮的27.9%~48.4%和12.2%~24.4%.因此,粉綠狐尾藻去氮能力受污水氮濃度的顯著影響,去除氨氮率顯著高于硝態(tài)氮;氮濃度還影響粉綠狐尾藻對氮的吸收積累和分配機制,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.
【作者單位】： 華中農(nóng)業(yè)大學資源與環(huán)境學院;新型肥料湖北省工程實驗室;中國科學院亞熱帶農(nóng)業(yè)生態(tài)研究所;
【分類號】：X703

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