曝气生物滤池-后置反硝化处理农村低C/N污水

Study on Low C/N Wastewater Treatment by Aeration Biological Filter Combined with Post-denitrification in Rural Area

针对农村生活废水分散、低C/N的特性,提出研究了一种联合处理技术即联合曝气生物滤池(BAF)和好氧-缺氧后置反硝化序批式序批式活性污泥反应器(SBR)。结果表明,BAF挂膜完成后COD、NH4+-N和TN去除率可高达67.5%、72.5%和51.9%。当BAF和SBR联合后,COD、NH_4^+-N和TN去除率显著高于BAF或者SBR单独处理。COD的去除主要集中在SBR阶段用于反硝化脱氮,TN去除主要依赖BAF阶段特殊的生物分布。内聚物聚羟基烷酸酯(PHA)的最大合成质量摩尔浓度为5.9 mol/g并且在缺氧阶段迅速减少至4.2 mol/g;糖原质的最低质量摩尔浓度为4.8 mol/g,在随后的时间内逐渐升高至5.3 mol/g。

Aimed at the characteristics of rural domestic wastewater with dispersion and low C/N, combined process of aerated biological filter （BAF） and post-aerobic/anoxic denitrification sequencing batch reactor （SBR） was researched. The results showed that, the removal efficiencies of COD, NH4＋-N and TN could be as high as 67.5%, 72.5% and 51.9% after finishing the film culturing in BAF. When BAF and SBR were combined, the removal efficiencies of COD, NH4＋-N and TN were significantly higher than that of BAF or SBR alone. The COD removal was mainly concentrated in the SBR stage for denitrification and nitrogen removal, and TN removal mainly depended on the special biodistribution in the BAF stage. The maximum synthesis ofmolality of intracellular polymer polyhydroxyalkanoates （PHA） was 5.9 mol/g and rapidly decreased to 4.2 mol/g during the anoxic phase. The m!nimum molality of glycogen was 4.8 mol/g, which gradually increased to 5.3 mol/g in the subsequent time.