【摘要】 水源补给不足是高原富营养化湖泊治理的难点,污水处理厂尾水补给可有效增加入湖水量。基于氮、磷形态的变化分析,对污水处理厂尾水进入景观河道和入湖口汇水区的变化特征开展实验。结果发现:污水处理厂尾水中氮、磷含量可达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级A标准,NO₃^--N含量占比超过93%。河道中氮、磷含量随河道延伸有波动但总体呈下降趋势。在汇水区,草海水倒灌对河道水体中的氮、磷起到稀释作用,ρ（TN）和ρ（TP）分别达到5. 74,0. 258 mg/L。河道中底泥的氮、磷含量均高于水体中的,说明经过长期累积底泥已吸附了大量的N、P,但汇水区因受到草海水体中悬浮颗粒物沉降的影响,底泥中的氮含量低于水体中。因此,建议在利用尾水补给草海水源时,应在河道中栽种一些沉水植物来吸收NO₃^--N。更多还原

【Abstract】 The main bottleneck for remediating eutrophication of plateau lakes is insufficient water supply,but the effluent from sewage plants can effectively increase the amount of water into lake. Focused on different forms of nitrogen and phosphorus,this study was carried out on the changing characteristics of the effluent pollutants in landscape river and the catchment area. The results showed that the nitrogen and phosphorus of effluent reached level A,and the ratio of nitrate in total nitrogen reached 93% above. Along with the river flow,the contents of many forms of nitrogen and phosphorus decreased. In the catchment area,the total nitrogen and total phosphorus reached 5. 74 mg/L and 0. 258 mg/L respectively,meanwhile,the nitrogen and phosphorus in the river were diluted in different degrees,because of the backward irrigation of water from Caohai Lake. In the river channel,the contents of nitrogen and phosphorus in sediments were lower than that in water,indicating that water had great contribution to accumulation of nitrogen and phosphorus in sediments. In the catchment area,sediments was affected by the deposition of suspended particles from lake water,so the nitrogen and phosphorus content in the sediment were also lower than that in water. Some aquatic plants should be planted in the river to absorb nitrate nitrogen when the effluent was used as supplying water.更多还原