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燃机电厂循环水排污水处理工艺研究

Research on Treatment Process of Sewage Discharged from Circulating Water in Gas Turbine Power Plants

  • 摘要:
      目的  在国家水资源重复利用的节水政策引导下,越来越多的电厂采用中水作为循环水补充水,增加了电厂循环水排污水的处理难度,文章针对循环水排污水中COD、总氮、总磷等污染物超标问题,提出了生物处理法结合高级氧化法的处理工艺。
      方法  以广东某燃机电厂为例,介绍了以中水为补充水的循环水排污水的水质特征,整理了近年来不同新建燃机电厂循环水排污水排放标准,针对超标污染物的种类和特性,提出了“反硝化池+二沉池+高级氧化+曝气生物滤池+砂滤”工艺,并深入分析了各级处理工艺的原理、功能及优缺点。
      结果  反硝化池在缺氧条件下,进行反硝化反应可实现总氮的脱除,芬顿和臭氧高级氧化可分解和氧化废水中难生物降解的COD,曝气生物滤池作为二级生化池,不仅有生物吸附和氧化作用,还有固液分离的过滤作用,可将前端工艺中剩余的COD和过量的外加碳源一起处理,实现COD的达标,通过混凝澄清和过滤可去除总磷和悬浮物。该工艺是一种高效稳定的循环水排污水深度处理工艺。
      结论  为实现电厂的循环水排污水稳定达标排放处理工艺提供参考。

     

    Abstract:
      Introduction  Under the guidance of the national water-saving policy for water resource reuse, more and more power plants are using reclaimed water as make-up water for circulating water, which increases the difficulty of treating sewage discharged from circulating water in power plants. This paper proposes a treatment process that combines biological treatment with advanced oxidation to address the issue relatd to excessive COD, total nitrogen, and total phosphorus pollutants in sewage discharged from circulating water.
      Method  Taking a gas turbine power plant in Guangdong province as an example, this paper described the water quality characteristics of sewage discharged from circulating water using reclaimed water as make-up water, and sorted out the discharge standards for sewage discharged from circulating water in different newly-built gas turbine power plants in recent years. Based on the types and characteristics of pollutants exceeding the standard, a "denitrification tank + secondary sedimentation tank + advanced oxidation + aerated biological filter + sand filter" process was proposed, and a thorough analysis of the principles, functions, advantages and disadvantages of various treatment processes was conducted.
      Result  Under anaerobic conditions in the denitrification tank, denitrification reaction can remove the total nitrogen. Fenton and ozone advanced oxidation can decompose and oxidize COD that is difficult to biodegrade in wastewater. As a secondary biochemical tank, the aerated biological filter not only has biological adsorption and oxidation effects but also has solid-liquid separation filtration effects. It can treat the remaining COD in the front-end process together with excess external carbon sources, achieving COD compliance. Total phosphorus and suspended solids can be removed through coagulation, clarification and filtration. This process is an efficient and stable in-depth treatment process for sewage discharged from circulating water.
      Conclusion  It can provide reference for the stable and standard discharge treatment process of sewage discharged from circulating water in power plants.

     

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