硝化型曝气生物滤池的挂膜与启动
Biofilm formation and startup of nitrification biological aeration filter
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摘要: 近年来,曝气生物滤池广泛应用于污水硝化过程中,硝化型曝气生物滤池应运而生。采用快速排泥挂膜法和自然挂膜法相结合的复合挂膜法,考察了进水是否含有机物对硝化型曝气生物滤池挂膜的影响。在19℃、HRT=55 min、出水DO=8 mg/L、进水NH+4-N约为50 mg/L的条件下,两滤池挂膜启动时间差异较大,进水不含有机物的1#滤池挂膜成功仅需18 d,当其运行稳定时NH+4-N的去除率达到100%;而进水含有机物的2#滤池挂膜成功需24 d,当其运行稳定时,COD和NH+4-N去除率分别为84.6%和91.2%。此结果表明,与含有机物的实际生活污水相比,采用不含有机物的模拟生活污水启动硝化型曝气生物滤池挂膜启动时间可缩短6 d,这主要是由于异氧菌产率系数比硝化菌大。Abstract: In recent years, biological aerated filters are widely applied in sewage nitrification process, nitrifying biological aerated filter emerges because of demand. The effect of organic pollutants on the startup of nitrifying BAF was investigated by using natural biofilm formation compound with quick exhaust sludge biofilm formation. Under the conditions of T=19℃,HRT=55 min,effluent DO=8 mg/L and influent NH+4-N about 50 mg/L, the startup time of both nitrifying BAF was different, the first nitrifying BAF needed only 18 days, when it was steady running, NH+4-N removal efficiency reached 100%,the second nitrifying BAF, while, needed 24 days when it was steady running, the removal efficiencies of COD and NH+4-N were 84.6% and 91.2%, respectively. The results showed that, compared with real sewage containing organic pollutants, the startup time of the first nitrifying BAF fed with artificial wastewater without organic pollutants decreased by 6 days. This was mainly because the yield coefficient of heterotrophic organisms was greater than nitrifying bacteria.
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