Zn(Ⅱ)长期作用对好氧颗粒污泥脱氮和微生物活性的影响  

LONG-TERM EFFECTS OF Zn(II) ON THE PERFORMANCE OF NITROGEN REMOVAL AND MICROORGANISM ACTIVITY OF AEROBIC GRANULES

作　　者：郑晓英[1] 吴颜科[1] 陈卫[1] 冒文娟[1] 倪明[1] 陈瑜[1] 

机构地区：[1]河海大学环境学院浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098

出　　处：《水处理技术》2014年第6期24-28,共5页Technology of Water Treatment

基　　金：国家自然科学基金(51208174);水体污染控制与治理科技重大专项(2012ZX07506-002-2)

摘　　要：在SBR系统内,通过对不同Zn(Ⅱ)投加量(0、3、5、10、15mg/L)长期作用下好氧颗粒污泥比氨氧化速率、比亚硝酸盐氧化速率、比反硝化速率、EPS、TTC-ETS和SOUR的变化规律分析,研究了Zn(Ⅱ)长期作用对好氧颗粒污泥脱氮和微生物活性的影响。结果表明,当Zn(Ⅱ)≤5mg/L时,对好氧颗粒污泥脱氮和微生物活性影响较小,而10mg/L以上Zn(Ⅱ)会对好氧颗粒污泥脱氮反应速率和微生物活性产生明显抑制作用。当与Zn(Ⅱ)作用80 d后,投加15 mg/L Zn(Ⅱ)反应器内好氧颗粒污泥比氨氧化速率、比亚硝酸盐氧化速率、比反硝化速率抑制率分别达到45.6%、37.9%和27.4%,好氧颗粒污泥TTC-ETS和SOUR活性抑制率分别为69.1%、43.6%。通过对比Zn(Ⅱ)抑制颗粒污泥TTC-ETS和SOUR的IC50,可以得出TTC-ETS活性在反映Zn(Ⅱ)毒性作用的灵敏性大于SOUR活性。随着Zn(II)投加量增大,好氧颗粒污泥EPS及其主要组成PS和PN分泌量均呈现增加趋势。与PS相比,PN增加较快。The long-term effects ofZn （II） on the nitrogen removal and microorganism activity of the aerobic granular sludge were investigated in the SBR reactors, which is dependent on the variability of the ammonia oxidation, nitrite oxidation and denitrification rate, EPS and its constituents, TTC-ETS and SOUR of the aerobic granules. The results show that 0~5 mg/L Zn （II） have slight effect on the performance of nitrogen removal and microorganism activity, while more than 10 mg/L Zn （II） has a toxic effect. After the aerobic granular sludge was exposed to 15 mg/L Zn （ II ） for 80 days, the inhibitory percentages of 45.6% for ammonia oxidation, 37.9% for nitrite oxidation rate and 27.4% for denitrification rate were detected. 15 mg/L Zn （ II ） inhibited TTC-ETS and SOUR of the aerobic granules by 69.1% and 43.6%, separately. TTC-ETS would be more suitable for detecting microbial activity of the aerobic granular sludge than SOUR by testing IC50. As Zn （ II ） concentration was increasing gradually, the EPS excreted by the aerobic granular sludge increased, together with its main constituents PS and PN. PN rose more raoidlv comoared with PS.

关 键 词：好氧颗粒污泥 ZN(II) 脱氮功效 微生物活性 SBR反应器 

分 类 号：X703[环境科学与工程—环境工程]