铁屑法预处理焦化废水

焦化废水脱氮大多采用生化法处理，但化学需氧量（COD）高不利于后续生物脱氮的行为，为了降解COD，采用铁屑法对焦化废水进行预处理。在铁屑中加入辅料并曝气对焦化废水进行预处理，在没有将废水pH调节至酸性的情况下，取得了较发好的预处理效果，CODcr的去除率约40％。实验结果表明影响因素的重要性依次为铁屑用量、石墨用量、辅料A用量、处理时间、曝气时间。预处理反应器运行两个月，处理效率没有显著降低，运行结果稳定。

Pretreatment of Coke Oven Waste Water with Iron Scrap Method

Denitrification of Coke oven waste water is most biological.That COD/NH 3 N is too high is adverse to biological denitrification.Iron scrap method is used to pretreat coke oven wastewater in order to degrade COD.Coke oven wastewater is pretreated by iron scrap with ancillary material. A good result is got that the removal efficiency of COD cr of wastewater is 40% or so without regulating pH of wastewater and the solution is alkaline.The results show that the factors arragned in important order as the follows:the quantity of iron scrap,graphite,ancillary material A, treatment time,aeration time.The removal efficiency of COD does not lower ater the reactor has run about two months. The results are stable.