包埋活性污泥和反硝化污泥全程硝化反硝化脱氮

Complete nitrification and denitrification using embedded mixed sludge

将活性污泥和驯化所得的反硝化污泥菌泥按适当比例混合后,用聚乙烯醇(PVA)将其包埋,制成直径为3～4mm的颗粒小球。以模拟废水为处理对象,在流化床反应器内进行实验。结果表明,包埋颗粒小球对氮素和COD的去除效果良好,当包埋颗粒填充率为7%～8%(体积比),控制其他条件,12 h的NH4+-N和TN去除率均在95%以上,对COD的去除率大于95%。整个过程中NO2--N未见明显积累,因此为全程硝化反硝化脱氮。最后,通过单因素实验得出的最佳温度、pH值和溶解氧浓度分别为30℃、7.5和4 mg/L。

Complete nitrification and denitrification technology in a traditional fluidized bed reactor with ar- tificial domestic wastewater was studied, using the preparations of activated sludge and denitrifying sludge en- trapped in polyethylene gel beads. The diameter of the granule was 3 -4 mm. The results showed that when fill rate of polyethylene gel bead was 7% - 8% （V/V） , HRT was 12 h, both NH4 -N and TN removal efficiencies were more than 95% , and COD removal efficiency was above 95%. In the whole experiment, no significant accumulation of NO2--N was observed, so complete nitrification and denitrification was predominant. Finally, through the single factor experiment, the optimum temperature, pH value and dissolved oxygen concentration for microorganisms were obtained, 30℃ ,7.5 and 4 mg/L, respectively.