华北稻田灌溉水多级表面流强化人工湿地工程系统设计研究

STRENGTHENING MULTI-SURFACE FLOW CONSTRUCTED WETLAND ENGINEERING DESIGN FOR PADDY IRRIGATION WATER IN NORTH CHINA

以河北曹妃甸水稻田为研究对象,分析测定灌溉水样中SS、COD和氨氮的含量并依据有关国家标准确定其污染程度。根据当地农业生产条件、工程地质与农田环境特点及不同治理方案的经济技术可行性,选用由工程保障和植物生态系统构成的多级表面流强化人工湿地系统修复灌溉水有机污染,并对其修复效果进行量化评价。结果表明:研究区内稻田灌溉水SS、COD、NH3-N 3种污染物的浓度削减率依次为76.17%、60.02%、55.08%,出水达到农田灌溉水质标准和地表水Ⅴ类水质要求。人工湿地系统的建立不仅改善灌溉水水质,保证农产品质量,还有效恢复了湿地的生态功能,实现环境与经济效益的统一。

Take the paddy in Caofeidian,Hebei Province as the object,the paper analysed the concentrations of SS,COD and NH3- N in the irrigation water and determined the pollution degree according to the national criteria. According to local agricultural production conditions,engineering geology,environmental characteristics of farmland and the economic and technical feasibility of different treatment programs,the strengthening multi-surface flow constructed wetland system was chose to repair the organic pollution of irrigation water,which was constituted by the engineering support and plant ecosystems. At the same time,the evaluation of its restorative effects was quantified. Results showed that： The removal rates of SS,COD and NH3-N in the irrigation water were 76. 17%,60. 02%,55. 08%. The wetland effluent reached the Irrigation Water Quality Standards and the Grade Ⅴ criteria in the Environmental Quality Standards for Surface Water,which ensured the water quality and increased the crop quality. Meanwhile,the ecological function of wetland was effectively restored,which achieved environmental and economic benefits.