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研究了酸中和残渣(NUA)和脱水铝污泥(DAS)生态滤池对畜禽养殖废水中COD、NH_3-N、TN和TP的去除效果。结果表明,运行稳定后装置NUA出水COD、NH_3-N、TN和TP的平均去除率分别为52%、47%、47%、34%,系统总出水分别为79%、78%、70%、96%。NUA滤池在COD、TN去除中发挥主要作用,DAS滤池较NUA更有利于TP去除,两滤池对NH_3-N去除贡献率差异不大。对2种滤料基本属性、硝化菌和反硝化菌数量分析可知,DAS和NUA均有较大的孔隙率和比表面积,其中DAS更为明显,滤料中硝化菌和反硝化数量随着反应的进行逐渐增多,硝化菌较反硝化菌数量高1~2个数量级;系统稳定运行后,DAS中硝化菌数量显著高于NUA中数量,NUA中反硝化菌数量较DAS占优势。NUA和DAS对畜禽废水中营养物质有较好的去除效果,且为优化污水处理工艺提供一种新的资源化利用反应介质。
The removal efficiency of COD, NH_3-N, TN and TP in livestock and poultry wastewater by using acid-neutral residue (NUA) and dehydrated aluminum sludge (DAS) ecological filter was studied. The results showed that the average removal rates of COD, NH_3-N, TN and TP in NUA effluent were 52%, 47%, 47% and 34%, respectively. The total output of NUA was 79%, 78% and 70% 96%. NUA filter plays a major role in the removal of COD and TN. DAS filter is more favorable for TP removal than NUA, and there is no significant difference in the contribution rate of NH3-N between the two filters. The basic properties of the two media, nitrifying bacteria and denitrifying bacteria quantitative analysis shows that, DAS and NUA have greater porosity and specific surface area, of which DAS is more obvious, the amount of nitrifying bacteria and denitrification in the filter with the reaction The number of nitrifying bacteria was 1 ~ 2 orders of magnitude higher than that of denitrifying bacteria. After the system was in stable operation, the number of nitrifying bacteria in DAS was significantly higher than that in NUA, and the number of denitrifying bacteria in NUA was more dominant than DAS. NUA and DAS have better removal effects on nutrients in livestock wastewater and provide a new resource utilization reaction medium for the optimization of sewage treatment process.