搅拌速率对剩余污泥厌氧水解酸化的影响研究

摘要

搅拌速率大小对污泥中有机质的溶出影响较大.改变不同的机械搅拌速率,对剩余污泥中SCODCr、VFAs等的溶出进行对比研究.结果表明,搅拌越快越利于SCODCr值的生成,搅拌速率为410 ～ 430 r/min时,产生的SCODCr值明显大于较低搅拌速率,但是如此高速的搅拌使污泥处于剧烈搅动状态,可使大气中的氧不断的溶入,污泥产酸效率下降,搅拌速率越大这种影响越明显；当搅拌速率为70 r/min时,试验中采用的3层搅拌器的轴功率约为87.1 W.%The release of organic matters from sludge was greatly affected by stirring speed. Through changing mechanical stirring speed, the release of SCODcr, VFAs and some other matters from excess sludge were compared and studied. The results showed that, high-speed stirring was of benefit to the SCODCr value increase, the SCODCr. Value with stirring speed of 410 - 430 r/min was obviously greater than those with lower stirring speed. However, to stir sludge at such a high speed caused the oxygen in air continuously dissolved into it, and decreased the acid production rate, the higher the stirring speed was, the more obvious the said affection would be; when the stirring speed was 70 r/min, the shaft power of the three-layer stirrer used in the test was about 87.1 W.