沉箱填料强化MBR工艺脱氮的试验研究

[目的]研究沉箱填料强化MBR工艺对有机物和氮的去除效果.[方法]通过向MBR反应池投加沉箱填料处理生活污水,研究沉箱填料强化MBR工艺对有机物和氮的去除效果.[结果]未加填料和已投填料的出水COD均值分别为26.8、24.7 mg/L,投加填料比未加填料的脱氮效果要好,对NH3-N去除率均值分别为98.44％、96.37％；对TN去除率均值分别24.03％、16.43％.出水COD和NH3-N浓度低于《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准.出水TN主要以NO3-N形式存在(98.06％),NH3-N和NO2-(-0N所占的比例很小,只占整个TN的1.22％和0.72％.对反硝化脱氮研究的进一步建议:①沉箱填料与反应池体积比重增至4％～5％；②更换单个体积较小,内部纤维量较多的填料；③适量减少曝气量,使MBR反应池内的DO减少到1.5 ～3.0 mg/L.[结论]该研究为今后的工程实践提供了理论依据.

Experimental Research for Denitrification by Caisson Filler Enhanced MBR Process

[Objective] The research aimed to study removal effects of the organic matter and N by caisson filler enhanced MBR process.[Method] By adding caisson filler to reaction pool of the MBR to treat domestic sewage,removal effects of the organic matter and N by caisson filler enhanced MBR process were studied.[Result] COD means in effluent were respectively 26.8 and 24.7 mg/L by without adding filler and with adding filler.Average removal rates of the NH3-N were 98.44% and 96.37%,while average removal rates of the TN were 24.03% and 16.43%,respectively.COD and NH3-N concentrations in effluent were lower than the first A grade criteria of Discharge Standard of the Pollutant for Municipal Wastewater Treatment Plant(GB18918-2002).NO-3-N was main form of the TN in effluent and occupied 98.06%,while NH3-N and NO-2-N only accounted for 1.22% and 0.72%.Further suggestion for denitrification study was as below.Firstly,the proportion of caisson filler on volume of the reaction cell should be increased to 4%-5%.Secondly,single smaller filler with larger amount of internal fiber ought to be replaced.Thirdly,aeration amount needed to be decreased to right value,making that DO of the MBR reaction cell reduced to 1.5-3.0 mg/L.[Conclusion] The research provided theoretical basis for future engineering practice.