南方农田灌溉水人工湿地处理工程设计研究

以福建长乐基本农田示范区为研究区域,通过采集化验灌溉水样品,依据国家标准确定其污染程度和主要污染物。在综合考虑各种水污染修复方法的适用范围和经济技术可行性后,结合当地实际条件,选用多级表面流人工强化湿地系统治理灌溉水有机污染,最后对人工湿地的修复效果进行评价。评价结果表明:研究区内农田灌溉水的SS、COD和氨态氮污染物质量浓度削减率分别为91%、59%、49%,出水达到农田灌溉水质标准和地表水Ⅴ类水质要求,保证了灌溉水水质,提高了作物产量与品质。同时,生态修复措施恢复重建了河道湿地的生态功能,实现环境效益与经济效益的统一。

Constructed Wetland Engineering Design of Farmland Irrigation Water in South China

Based on the irrigation water environmental quality data by collecting samples for testing,the farmlands of Changle,Fujian Province,were appraised by referring to the national criteria for determining the degree of pollution and major pollutants.After considering various methods of water pollution reparation in the scope,economic and technical feasibility and the actual local conditions,the selection was multi-surface flow constructed wetland system to reparation the organic pollution of irrigation water.Finally evaluate the effect of wetlands.Results showed that: the concentrations of SS,COD and NH+4-N in the irrigation water were reduced by 91%,59%,49%,respectively.The discharge water from wetland achieved the grade Ⅴ criteria in the environmental quality standards for surface water and the irrigation water quality standards,which ensured the water quality and increased the crop yields and quality.Meanwhile,the ecological function of river shore wetland is restored through measures of ecological rehabilitation,to achieve environmental and economic benefits.