某污水处理厂提高脱氮效果的研究

Research on Improving the Nitrogen Removal Effect of a Sewage Plant

随着我国科学技术和经济的快速发展,环境污染日益成为突出而严峻的问题。2015年国家出台了《水污染防治行动计划》,要求重点流域、区域的城镇污水处理厂出水水质满足《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准。严格的标准对城市污水处理厂的去除效率提出了挑战,具体分析污水处理厂污染物质的转变、去除过程有助于污水处理厂工艺的进一步优化,氮作为环境质量评价的一个重要指标,其在污水处理厂中的去除效率也一直是业界非常关心的一个问题[1]。目前,我国城镇生活污水普遍采用的处理工艺为活性污泥法,对于大部分城镇污水处理厂来说,TN是制约大部分城镇污水处理厂稳定达一级A标准的主要因素。本文系统结合了A/O工艺与A^(2)/O工艺的不同特点,主要介绍在该种情况下的运行过程中通过控制不同的内外回流比,如何提高脱氮效率,对于类似项目有一定的参考意义。

With the rapid development of China's science and technology and economy,environmental pollution has become an increasingly prominent and serious problem.In 2015,the state issued the Action Plan for the Prevention and Control of Water Pollution,which requires the effluent quality of urban sewage treatment plants in key river basins and regions to meet the first-class A standard of the Urban Sewage Treatment Plant Pollutant Discharge Standard(GB18918-2002).Strict standards pose a challenge to the removal efficiency of urban sewage treatment plants,and the specific analysis of the transformation of pollutants in sewage treatment plants,the removal process is conducive to the further optimization of sewage treatment plant processes,nitrogen as an important indicator of environmental quality evaluation,its removal efficiency in sewage treatment plants has always been a very concerned issue in the industry[1].At present,the treatment process commonly used in China's urban domestic sewage is activated sludge method,for most urban sewage treatment plants,TN is the main factor restricting the stability of most urban sewage treatment plants to reach the first-class A standard.This paper combines the different characteristics of A/O process and A^(2)/O process,and mainly introduces how to improve the nitrogen removal efficiency by controlling different internal and external reflux ratios during the operation process under this case,which has certain reference significance for similar projects.