MAO-MBR工艺在市政污水提标改造中的应用研究
发布时间：2018-07-27 11:42
【摘要】：我国水污染问题日趋严重,水资源短缺己经影响到生态环境和人类健康,污水排放标准也日趋严格。基于当前情况,对污水处理厂进行提标改造,成为城镇污水处理行业迫在眉睫、亟待解决的关键技术难题。本研究依据天津某污水处理厂的进水水质,以天津市《城镇污水处理厂水污染物排放标准》(DB12599-2015)的A级标准进行设计,选择多级AO与MBR组合工艺进行试验研究。通过对MAO-MBR工艺的中试设备进行调试和优化试验,系统研究组合工艺的特点和优势,优选合理的参数取值范围,并研究工艺对水中污染物的去除情况和低温下的运行情况。研究结果:在低温(7-13℃)下,经MAO-MBR组合工艺处理后,出水COD、NH3-N、TN、TP 平均浓度 24.45mg/L、0.85mg/L、6.00mg/L、0.10mg/L,平均去除率分别为97%、98%、86%、98%,均达到天津市《城镇污水处理厂水污染物排放标准》(DB12599-2015)A级标准。系统对进水水质在一定范围内体现出较强的抗冲击负荷能力。通过对HRT、DO、R、SRT和膜池曝气量等因素研究可以得出,当HRT为12.5h时,对各项污染物处理效果较好;DO1mg/L时,对NH3-N和TN的去除率低,当DO2mg/L时,影响对有机物的消解,影响出水COD。在污泥回流比R为50%、75%、100%、150%四种工况下运行时,对TN的去除率逐渐增加。在四级多点进水的设计条件下,50%的回流比即可满足出水要求。SRT对TP去除效果影响最大,在SRT=12d时去除率为97.8%,当SRT40d时,对TP的去除率下降,当SRT=100d时,污泥老化,对COD、NH3-N和TN去除率也出现降低趋势。膜池曝气量为30m3/h时,跨膜压差的增加速率为0.8KPa/d,缓解了膜污染,又保证对TP的去除。对组合工艺MAO-MBR中沿程的变化进行研究得出,MLSS沿程逐渐减低,存在浓度梯度;COD、NH3-N、TN、TP的消耗主要发生在前两级,承担了大部分的去除。COD对TN的影响情况,当COD400mg/L时,系统的脱氮效果良好,去除率达到85%以上。当COD低于400mg/L时,出水TN在10mg/L左右,去除率降低。从10℃到18℃,组合工艺的硝化速率增加了 25%。与生化部分相比,组合工艺的硝化速率明显较高,温度为10℃时,从0.016kgNH3-N/(kgMLSS·d)增加到0.019kgNH3-N/(kgMLSS·d)。MAO-MBR工艺是一种节能、高效和稳定的污水处理工艺,可运用到升级改造的实际工程中,提高出水水质。
[Abstract]:The problem of water pollution is becoming more and more serious in China. The shortage of water resources has affected the ecological environment and human health. Based on the current situation, upgrading the standard of sewage treatment plant has become an urgent and urgent technical problem in urban sewage treatment industry. According to the influent water quality of a wastewater treatment plant in Tianjin and the A class standard of Tianjin Municipal sewage treatment Plant Water Pollutant discharge Standard (DB12599-2015), the multistage AO and MBR combined process was selected for experimental study. By debugging and optimizing the pilot plant of MAO-MBR process, this paper systematically studies the characteristics and advantages of the combined process, optimizes the range of parameters, and studies the removal of pollutants in water and the operation at low temperature. The results showed that at low temperature (7-13 鈩，
本文编号：2147711
[Abstract]:The problem of water pollution is becoming more and more serious in China. The shortage of water resources has affected the ecological environment and human health. Based on the current situation, upgrading the standard of sewage treatment plant has become an urgent and urgent technical problem in urban sewage treatment industry. According to the influent water quality of a wastewater treatment plant in Tianjin and the A class standard of Tianjin Municipal sewage treatment Plant Water Pollutant discharge Standard (DB12599-2015), the multistage AO and MBR combined process was selected for experimental study. By debugging and optimizing the pilot plant of MAO-MBR process, this paper systematically studies the characteristics and advantages of the combined process, optimizes the range of parameters, and studies the removal of pollutants in water and the operation at low temperature. The results showed that at low temperature (7-13 鈩，
本文编号：2147711
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