摘要
以某化工园区污水处理厂综合废水为对象,采用"膜生物反应器(MBR)—O_3催化氧化—曝气生物滤池(BAF)"组合工艺进行深度处理。结果表明:(1)MBR适宜的DO、混合液悬浮固体质量浓度(MLSS)分别为3、3 000~4 000 mg/L。粉末活性炭(PAC)的投加对COD的去除有明显促进作用,并可提高系统的抗冲击负荷,延缓MBR膜通量的下降速率,减少溶解性微生物产物和胞外聚合物的积累,有效缓解膜污染。(2)采用O_3催化氧化作为BAF的前处理单元,可节约30%(质量分数)的O_3投加量,BAF出水COD和氨氮平均去除率分别提高9.9、5.1百分点。(3)在PAC投加量100mg/L、O_3投加量50mg/L、O_3接触氧化时间2h、BAF水力停留时间6h的条件下,组合工艺出水COD、氨氮、TP平均分别为76.5、3.6、<0.4mg/L,达到江苏省《化学工业主要水污染物排放标准》(DB 32/939—2006)一级标准。而且,废水中特征有机污染物得到有效降解,应急毒性有较大程度降低。
A combined process ＂MBR-O3 catalytic oxidation-BAF＂was used for treatment of comprehensive wastewater from a chemical industrial park.The results showed：（1）suitable DO and MLSS were 3,3 000-4 000mg/L in MBR,respectively.Adding PAC in MBR could promote the COD removal and the resistance to impact load effectively.Membrane flux decrease and membrane fouling of MBR were also controlled due to the accumulation decrease of SMP and EPS.（2）O3catalytic oxidation before BAF could rise 9.85 and 5.1percent point to COD and ammonia nitrogen removal rate,respectively,and 30%（mass ratio）of O3 dosage could be saved.（3）Under a certain condition（dosing quantity of PAC=100mg/L,dosing quantity of O3=50mg/L,contact oxidation time of O3=2h and HRT of BAF=6h）,the effluent could meet the first level standard of＂Discharge standard of water pollutants for chemical industry＂（DB 32/939-2006）in Jiangsu.It was revealed that major characteristic organic pollutants in wastewater were degraded and the emergency toxicity of the wastewater was also reduced greatly.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2017年第7期757-764,共8页
Environmental Pollution & Control
基金
江苏省环保科研项目(No.2013036)
