高亚硝态氮钝化清洗废水的生物处理及过程控制  

Biological treatment of high concentration NO_2^--N in passivation washing wastewater and process control strategy

作　　者：董怡君[1] 王淑莹[1] 张宇坤[1] 彭永臻[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京市污水脱氮除磷处理与过程控制工程技术研究中心,北京100124

出　　处：《化工学报》2014年第8期3164-3169,共6页CIESC Journal

基　　金：国家高技术研究发展计划项目(2012AA063406);北京市教委科技创新平台项目~~

摘　　要：钝化清洗废水含有高浓度亚硝态氮,采用普通活性污泥难以进行生物处理。采用亚硝态氮废水富集亚硝态氮氧化菌(NOB),以富含NOB污泥的SBR装置处理模拟化学清洗钝化废水,并提出了该处理工艺的过程控制策略。结果表明:该工艺可以在300 min内完全氧化亚硝态氮浓度高达2000 mg·L-1的钝化废水,高浓度亚硝态氮没有对生物降解过程产生明显抑制;反应过程中DO浓度的变化与亚硝态氮氧化过程存在相关性,溶解氧浓度的移动斜率变化(DO-MSC)可作为亚硝态氮氧化过程控制参数;当DO-MSC>0.02时,亚硝态氮氧化过程结束,此时可停止曝气。批次试验结果显示在不同曝气量(0.02~0.125 m3·h-1)和不同温度条件(15~30℃)下,DO-MSC指数均可有效指示亚硝态氮氧化终点。Biological treatment of high concentration NO-2-N in passivation washing wastewater is difficult. In this paper nitrite oxidizing bacteria （NOB） was enriched by feeding NO-2-N wastewater, NOB-rich activated sludge was used in an SBR system to treat simulated passivation washing wastewater, and a process control strategy was put forward. The results showed that using the process passivation washing wastewater with NO-2-N concentration 2000 mg·L-1 could be totally oxidized within 300 min. The nitrite oxidation process was not inhibited by the high NO-2-N concentration. Furthermore, this process had a correlation with the variation of DO concentration during reaction. DO-MSC, a parameter of the process control strategy, indicated the end of the reaction when it was more than 0.02. The results of batch tests showed that the DO-MSC could indicate the end of the nitrite oxidation process both in different aeration rates（0.02-0.125 m3·h-1） and different temperature（15-30℃）.

关 键 词：废水 亚硝态氮 SBR DO-MSC 过程控制 曝气 温度 

分 类 号：X703[环境科学与工程—环境工程]