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作 者:朱彦辉 朱易春[1,2] 刘祖文[1] 田帅[1] 李鑫[1] ZHU Yanhui;ZHU Yichun;LIU Zuwen;TIAN Shuai;LI Xin(Jiangxi Province Key Laboratory of Environmental Geotechnical Engineering and Hazards Control,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Ganzhou City Key Laboratory ofRiver Basin Pollution Simulation and Control,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
机构地区:[1]江西理工大学江西省环境岩土与工程灾害控制重点实验室,江西赣州341000 [2]江西理工大学赣州市流域污染模拟与控制重点实验室,江西赣州341000
出 处:《有色金属科学与工程》2023年第3期400-406,共7页Nonferrous Metals Science and Engineering
基 金:国家自然科学基金资助项目(51868025);江西省自然科学基金重点项目(20202ACBL204017)。
摘 要:以污泥基质降解速率(vCOD)、胞外聚合物(EPS)和酶活性(DHA)等变化为评价指标,探究了不同进水Cu(Ⅱ)浓度下低强度超声波提高厌氧污泥对重金属Cu(Ⅱ)耐受性影响的效应。结果表明,低强度超声波能够提高污泥微生物对Cu(Ⅱ)的耐受性。随着进水Cu(Ⅱ)浓度升高,超声组与对照组vCOD均下降,但超声组vCOD下降幅度更缓。超声组和对照组进水Cu(Ⅱ)浓度与污泥基质降解速率抑制百分比之间的关系拟合得到IC_(50)分别为94.62 mg/L和88.85 mg/L,表明低强度超声波能够提高厌氧污泥对Cu(Ⅱ)的抑制阈值。进水Cu(Ⅱ)浓度为1 mg/L时,超声组与对照组EPS含量略有提高,而后随着Cu(Ⅱ)浓度升高而逐渐降低,但超声组比对照组EPS含量更高,可能是低强度超声波通过促进污泥分泌更多的EPS降低了Cu(Ⅱ)的生物毒性。此外,超声组的DHA活性比对照组提高了3.95%~36.31%。因此,通过低强度超声波可以提高厌氧污泥对重金属Cu(Ⅱ)的耐受性,从而维持污水厌氧生物处理的稳定运行。With the changes of sludge matrix degradation rate(vCOD),extracellular polymeric substances(EPS)and enzyme activity(DHA)as the evaluation indexes,the effects of low-intensity ultrasound on the tolerance of heavy metal Cu(Ⅱ)in anaerobic sludge were investigated under different influent Cu(Ⅱ)concentrations.The results show that low-intensity ultrasound can improve the tolerance of sludge microorganisms to Cu(Ⅱ).With the increase of the concentration of Cu(Ⅱ)in the influent,the vCOD decreases in both the ultrasound group and the control group,but vCOD in the ultrasound group decreases more slowly.The fit of the relationship between the influent Cu(Ⅱ)concentration and the percentage inhibition rate of sludge matrix degradation in the ultrasonic group and the control group yieldes IC_(50)of 94.62 mg/L and 88.85 mg/L,respectively,indicating that low-intensity ultrasonic waves can improve the inhibition threshold of Cu(Ⅱ)by anaerobic sludge.The EPS content in the ultrasound group and the control group increase slightly when the concentration of Cu(Ⅱ)is 1 mg/L in the influent,and then decrease gradually with further increasing concentration of Cu(Ⅱ).However,the EPS content in the ultrasound group is higher than that in the control group,which may be that low-intensity ultrasound reduces the biotoxicity of Cu(Ⅱ)by promoting more EPS secretion from sludge.In addition,compared to the control group,the DHA activity of the ultrasound group is increased by 3.95%‒36.31%.Therefore,the tolerance of anaerobic sludge to the heavy metal Cu(Ⅱ)can be improved through low-intensity ultrasound,to maintain the stable operation of the anaerobic biological treatment of sewage.
关 键 词:低强度超声波 厌氧污泥 重金属Cu(Ⅱ) 脱氢酶活性 胞外聚合物
分 类 号:TF19[冶金工程—冶金物理化学] X703.1[环境科学与工程—环境工程]
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