Study on Intercepting Method for Nitrogen and Phosphorus in Ecological Ditches and Pond

• 作者: DIN G Hon g-m in g X U Jie YAO Jian -tin g
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: ECOLOGICAL DITCHES and POND Emission load REAL control area METHOD STUDY China
• 年，卷（期）: 2012,（11）
• 页码范围: 58-60
• 页数: 3页
• 分类号: X13

摘要

[Objective] The research aimed to reduce emission load of the farmland runoff by using ecological ditches and pond. [Method] N and P intercepting project construction of the ecological ditches and pond in Zhaiji Village, Xiangcheng District, Suzhou City as research object, by repairing 1 834 m3 of original drainage ditches, newly excavating 6 800 m2 of ecological main ditches and 6 000 m2 of artificial purification ecological pond, etc., runoff emission load in real control area of the project was counted. [Result] Annual net loads of the runoff emission for TN and TP were respectively 2 552.22 and 95.00 kg in 33.3 hm2 of farmland. Annual runoff intercepting loads of TN and TP were respectively 1 225.07 and 50.35 kg in ditches. Annual runoff intercepting loads of TN and TP were respectively 1 327.15 and 44.65 kg in ecological pond. In effluent, TN concentration was 6.32 mg/L and was smaller than 15 mg/L. TP concentration was 0.25 mg/L and was smaller than 0.5 mg/L. They both reached level-one A discharge standard. [Conclusion] The research provided theoretical basis for effective control of the agricultural non-point source pollution in Taihu Lake basin.