低DO浓度下短程硝化试验研究

STUDY ON SHORT-CUT NITRIFICATION PROCESS UNDER LOW DO LEVEL

进水氨氮浓度不变,低DO下启动并运行了短程硝化试验,考察了反应器内的氨氮氧化和亚硝酸盐积累情况。试验结果表明反应器内氨氮几乎全部被氧化,污泥浓度从4500mg/L下降到870mg/L,此时亚硝酸盐的积累率为55%,说明只控制DO的浓度很难实现高的积累率,同时受到温度和污泥龄等的较大影响。

A nitrification reactor was quickly started up and operated under low DO concentration with the steady influent NH 4+ /L.The oxidation of ammonium and nitrite accumulation were investigated.The results showthat the ammonium were nearly oxidated and sludge chroma fall down from4500mg/L to870mg/L,at the same time,the nitrosation rate(NO 2 -N/NO 3 -N)is55%.The results showed that it was harder to realize high nitrosation rate,only by controlling low DO;temperature and sludge age were key elements.