套筒式反应器处理实际污泥水的试验研究

Treatment of Actual Reject Water Using a Draft-tube Type Reactor

采用曝气吹脱提高碱度法促进鸟粪石在套筒式反应器中结晶以去除实际污泥水中的氮和磷,分析了其效果及存在的问题。连续188 d的运行结果表明,在气水比为30∶1条件下套筒式反应器可同步去除实际污泥水中的氮和磷,但去除效果有限,对NH+4-N和PO3-4-P的平均去除率分别为26.8%和55.7%,且其去除率呈现逆向的变化趋势。其原因在于套筒式反应器中存在大量的悬浮和附着态氨氧化菌(AOB)。尽管如此,采用该反应器仍可从每吨污泥水中回收232g纯度为92%的鸟粪石,因此可在一定程度上达到回收资源的目的。

Removal of phosphorus and nitrogen from actual reject water through struvite crystalliza tion enhanced by aeration, and the operating problems were investigated in a draft-tube type reactor. The results of 188 d continuous operation showed that the simultaneous removal of phosphorus and nitrogen from actual reject water could be achieved at a air-water ratio of 30 ： 1, however their removal efficiencies were limited, with the average removal rates of NH4 - N and PO4^3- - P were 26.8% and 55.7% respec- tively and presenting a reverse tendency. The reason for this was that large amounts of suspended and attached ammonia oxidizing bacteria （AOB） existed in the draft-tube type reactor. Even so, 232 g struvite with a purity of 92% could be recovered from a ton of reject water by using this reactor. Thus the resource in the reject water could be recycled to some extent.