污泥龄对A2/O工艺脱氮除磷效果的影响

污泥龄(SRT)作为活性污泥法设计与运行的参数已显示出比其它参数更加重要。试验以实际生活污水为对象,研究SRT分别为5、10、15、20、25、30d时,系统CODCr、NH4+-N、TN、PO43-P的去除率以及污泥特性的变化,试验期间其它运行参数保持不变。试验结果表明:SRT=15d时系统总体脱氮除磷效果最好,此时CODCr、NH4+-N、TN、PO43-P去除率分别为:93%、98%、81%、82%,并对SRT=15d时系统中氮磷的浓度变化曲线进行分析。

NITROGEN AND PHOSPHORUS REMOVAL PERFORMANCE OF A2/O PROGESS AS A FUNCTION OF THE SLUDGE AGE

Sludge Retention Time (SRT),which was an important parameter in activated sludge process design and operation,has shown more effect than other parameters.COD_ Cr ,nitrogen(NH~ _4-N,TN) and phosphate (PO~ 3-_4-P) removal from sewage by anaerobic-anoxic-oxic(A~2/O)process were studied at different SRT,which were 5,10,15,20,25 and 30 d,respectively.During experiment other parameters kept constant.The result shown that a sludge age of 15 days was found to be optimal resulting in maximum organic substances removal efficiencies,during which the removal rate of COD_ Cr ,NH~ _4-N,TN and PO~ 3-_4-P was 93%,98%,81% and 82%,respectively,at the same time the profiles of organic substances concentration in A~2/O process were also analyzed.