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EFFECT OF INFLUENT MODES AND RECIRCULATION POINT POSITION ON NITROGEN AND PHOSPHORUS REMOVAL BY A MULTI-STAGE BIOLOGICAL CONTACT OXIDATION PROCESS
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摘要: 以实际生活污水(C/N(碳氮比)约为3)为处理对象,研究了进水方式和回流点位置对多段式生物接触氧化法脱氮除磷性能的影响,同时研究了微生物群落结构的变化特征。结果表明:在连续进水和间歇进水条件下,系统对COD去除率分别为87.61%和78.94%,但出水COD平均浓度达GB 18918—2002《城镇污水处理厂污染物排放标准》一级A标准,系统耐冲击负荷能力较强。当混合液从第6格回流到第1格时,COD和TN去除率分别为88.78%和83.10%,满足GB 18918—2002一级A排放标准,TN处理效果与回流点位置相关。系统污泥量较少,无剩余污泥排放,TP去除效果稍差,采用化学除磷,TP去除效果与回流点位置无关。通过对系统生物多样性和生物膜干质量的分析,表明增加回流改变了系统的微生物种群结构,提高了系统脱氮效率。Abstract: Taking actual domestic sewage with C/N of about 3 as the treatment object, the influence of influent mode and the position of the recirculation point on the function of denitrification and dephosphorization on multi-stage biological contact oxidation porcess was evaluated. The results showed that the removal rate of COD was 87.61% and 78.94% respectively, under the conditions of continuous water inlet and intermittent water inflow. But the average concentration of effluent COD met the Grade A in China’s national standard, GB 18918—2002. And the system had stronger ability for resisting shock load. When the mixed liquid was returned from the sixth grid to the first grid, the removal rate of COD and TN was 88.78% and 83.10% respectively, and it met the Grade A standard of GB 18918—2002 sewage discharge. The treatment effect of TN was related to the position of the recirculation point, and the sludge volume of the system was very low, with no excess sludge discharged. While it had little effect on total phosphorus removal in this condition. The chemical removal of total phosphorus was used. The removal effect of total phosphorus was independent on the position of the recirculation point. Through the analysis of the system biodiversity and biofilm quality, it was found that the system microbial population structure was changed by increasing the reflux. It improved the system nitrogen removal efficiency.
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