利用微型后生动物进行污泥原位减量的试验研究

Application of Micro-metazoan for in situ Sludge Reduction

在A/A/O普通活性污泥工艺中引入非寡毛类微型后生动物考察其生长条件和对剩余污泥的减量效果及对系统处理效果的影响。结果表明,当进水负荷小于0.5 mg(/mg MLSS·d)时,非寡毛类微型后生动物可大量生长;当内回流比升高、外回流比降低时,更有利于虫体的繁殖。经过适时的运行工艺调整可使生化系统虫体密度和稳定性提高,污泥减量效果可达到40%以上。非寡毛类后生动物的活动与摄食作用提高了系统污泥的沉降性能,并对系统出水COD、NH3-N、TN、TP、SS没有影响。。

Non-oligochaeta metazoan was added into A/A/O activated sludge reactor to investigate its growth condition and effect of the sludge in situ reduction and influence on the treatment system. Result showed that when the influent loading rate was below 0.5 mg/（mgVSS ·d）, non-oligochaeta micro-metazoan could increase in a large quantity. When internal reflux ratio increased and external reflux ratio reduced, the worms grew better. The timely adjustment of operation process could improve the worm density and stability and excess sludge was reduced in the proportion of 40%. Existence of non-oligochaeta metazoan which is beneficial to improving sludge settleability has no influence on the removal of COD, NH3-N, TN, TP and SS.