基于耗氧速率预警重金属对活性污泥的抑制性  

EARLY WARNING OF ACTIVATED SLUDGE INHIBITORY ACTION BY HEAVY METALS BASED ON OXYGEN UPTAKE RATE INDEX

作　　者：陈亚松[1,2] 张超[2] 陈振国[2] 董文杰[2] 徐冰心[2] 

机构地区：[1]南京大学环境学院污染控制与资源化国家重点实验室,南京210023 [2]北京建工环境发展有限责任公司,北京100192

出　　处：《环境工程》2015年第2期27-31,52,共6页Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2014ZX07305001)

摘　　要：基于耗氧速率(OUR)的预警技术,以Cu2+、Zn2+的例(ρ(MLSS)=2 000 mg/L)研究了重金属对活性污泥的抑制作用,剂量由20 mg/L提高至60 mg/L时,Cu2+和Zn2+抑制率为分别由33%、38%,提高至77%、63%,存在剂量-效应关系。考察得知:4种重金属离子在特定条件下毒性大小顺序为:Cu2+>Zn2+>Cd2+>Cr3+。通过单因素和正交试验确定了最优运行参数:ρ(MLSS)为500 mg/L,HRT为10 min。在此条件下模拟毒性冲击的生产性试验表明:Zn2+和Cu2+(5 mg/L)冲击的平均抑制率分别为22.3%、56.6%,反馈时间20 min。因此,基于OUR的废水毒性预警技术能够及时、准确地反馈出重金属对活性污泥的影响。The early warning of activated sludge inhibitory rate by Cu2 ＋,Zn2 ＋was studied based on oxygen uptake rate（OUR） index. When dosage of Cu2 ＋and Zn2 ＋increased from 20 mg/L to 60 mg/L,the OUR inhibitory rate increased from33% and 38% up to 77% and 63%,respectively. With a rising of dosage of heavy metals,the activated sludge＇s inhibitory rate measured by OUR index was enhanced. With a certain condition and common dosage of heavy metals（20 mg/L）,the OUR inhibitory rate order by four heavy metals was Cu2 ＋ Zn2 ＋ Cd2 ＋ Cr3 ＋. The operation parameters for early warning reactor were optimized by single factor and orthogonal test,the results indicated that the best parameters were as follows：ρ（MLSS） = 500 mg/L,HRT = 10 min. The early warning equipment was applied to simulate sewage added in Cu2 ＋and Zn2 ＋respectively,which indicated that the OUR inhibitory rate was 22. 3% and 56. 6%,with common dosage of heavy metals（5 mg/L）. Thus,the early warning equipment based on oxygen uptake rate（OUR） index can be applied to early warning of the activated sludge inhibitory action by heavy metals in wastewater treatment plant.

关 键 词：耗氧速率(OUR) 重金属 毒性 抑制率 预警 

分 类 号：X703[环境科学与工程—环境工程]