农村生活污水处理设施水污染物排放标准制订探讨

Discussion on the Drafting of Water Pollutants Discharge Standard for Rural Domestic Sewage Treatment Facilities

  • 摘要: 农村生活污水处理设施水污染物排放标准是农村环境管理的重要依据,关系到污水处理技术和工艺的选择,以及污水处理设施建设和运行维护成本.通过对北京市、重庆市及浙江省等地区农村生活污水排放标准进行对比,发现现有标准存在适用范围不清晰、分类分级思路不全面及控制指标选择不合理等问题.因此,基于优化农村生活污水处理设施水污染物排放标准的制订提出3点建议:①明确标准适用于规模 < 500 m3/d的农村生活污水处理设施.②根据排水去向、处理设施规模以及尾水资源化利用因素等的不同进行标准分级.③建议选择pH、ρ(SS)、ρ(CODCr)、ρ(NH3-N)、ρ(TN)、ρ(TP)及ρ(动植物油)等作为控制指标,其中ρ(TN)和ρ(TP)适用于出水直接排入封闭水体或超标因子为氮、磷的不达标水体的处理设施,ρ(动植物油)适用于含农家乐废水的处理设施,有条件的地区可在上述控制指标的基础上适当增加,如阴离子表面活性剂浓度、类大肠菌群数、色度等.因此,提出因地制宜、及时修订、完善农村生活污水处理技术评估方法以及加强处理设施资金保障等建议,确保标准的顺利实施,切实做到污染物减排.

     

    Abstract: Discharge standard of water pollutants for rural domestic sewage treatment facilities is an important basis for rural environmental management, which is related to the choice of sewage treatment technologies and processes, and the costs of construction, operation and maintenance of sewage treatment facilities. The present study conducted a detailed contrastive analysis of the discharge standards of rural sewage treatment facilities in Beijing City, Chongqing City and Zhejiang Province, etc., and the results indicated that existing standards exhibit some shortages such as unclear scope of applications, incomplete classification and grading ideas, and unreasonable types of control indicators. Therefore, three suggestions are proposed to optimize the formulation of pollutant discharge standards for rural domestic sewage treatment facilities:(1) Clearly state that the standards are applicable to rural domestic sewage treatment facilities under 500 m3/d. (2) Classification according to variations of drainage direction and treatment facility scale. (3) Add pH, SS, CODCr, NH3-N, TN, TP and animal and vegetable oils as control indicators. Among them, total nitrogen and total phosphorus are suitable for the treatment facilities where the effluent is directly discharged into closed water bodies or where the limiting factors are nitrogen and phosphorus, while animal and vegetable oils are suitable for treatment facilities containing catering wastewater. The qualified region can appropriately add some control indicators (such as anionic surfactants, fecal coliform flora and chroma)based on those control indicators proposed in this study. Meanwhile, some suggestions are put forward, such as acting according to circumstances, revising the standard in time, improving the evaluation method of rural domestic sewage treatment technologies and strengthening the financial guarantee of the treatment facilities, to ensure the smooth implementation of the standards and effectively reduce pollutant discharge.

     

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