摘要
室外采用玻璃缸装置研究了抚仙湖常见的9种沉水植物氧化塘对澄江县污水厂尾水营养盐的去除效果及机制.结果表明:氧化塘中沉水植物的光合作用导致水体较高的DO和pH值,从而提高氧化塘总氮和总磷的去除率,但沉水植物叶片的腐烂分解则提高了水体氮磷的含量.沉水植物氧化塘对总氮和总磷的去除率分别介于19.44%-64.71%和28.13%-98.33%.沉水植物的直接吸收对总氮和总磷量去除的贡献比较低,占氧化塘总氮和总磷量的0.26%-1.54%和0.47%-1.77%.沉水植物氧化塘内DO、pH变化,促进了氮的降解及氧化还原分解,使其对氮的去除占氧化塘总氮量的30.71%-65.25%,而磷的去除则主要通过化学沉淀及基质吸附,占氧化塘总磷量的73.37%-93.34%.最终,选出蓖齿眼子菜、苦草、黑藻、金鱼藻和光叶眼子菜对氧化塘中氮磷具有较高的去除率.
In the field of the wastewater plant in Chengjiang County, an experiment was carried out to investigate the effect and mechanism of nutrient removal in oxidation ponds which were planted by nine submerged macrophyte. The result showed that, photosynthesis of submerged macrophytes in oxidation ponds induced the high level of water DO and pH which increased the removal effects of TN and TP,but the decomposition of submerged macrophyte leaves enhanced the content of TN and TP in the submerged macrophyte oxidation ponds. The removal rates of TN and TP in the ponds are 19.44% -64.71% and 28.13% -98.33% respectively. And the contributions of direct absorption by submerged macrophytes are low, which removed 0.26% - I. 54% of TN and 0.47% - 1.77% of TP in the oxidation ponds. The change of DO and pH have promoted nitrogen degradation and redox decomposition, which removed 30.71% - 65.25% of TN and 73.37% - 93.34%, while the removal TP was mainly by ways of chemical deposition and substrate adsorption in the ponds. Finally, Motamgeton pectinatus, Vallisneris spiralis, Hydrilla verticillata, Ceratophyllum demersum and Motamgeton lucens are chosen as the ones which had high nitrogen and phosphorus removal rates in submerged macrophyte oxidation ponds.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2010年第4期538-544,共7页
Journal of Lake Sciences
基金
国家重点基础研究发展规划"973"项目(2008CB418005)
国家"863"计划项目(2006AA06Z325)
国家水污染治理专项项目(2008ZX07101-007-05)资助
关键词
沉水植物氧化塘
尾水
氮
磷
抚仙湖
Submerged maerophyte oxidation pond
tail water
nitrogen
phosphorus
Lake Fuxian
