Acute and chronic toxicity of nickel to nitrifiers at different temperatures

论文摘要

This study investigated the acute nickel toxicity on nitrification of low ammonia synthetic wastewater at 10, 23, and 35°C. The nickel inhibition half-velocity constants(KI,Ni) for ammonia oxidizing bacteria（AOB） and nitrite oxidizing bacteria（NOB） based on Ni/MLSS ratio at 10, 23, and 35°C were 5.4 and 5.6 mg Ni/g MLSS, 4.6 and 3.5 mg Ni/g MLSS, and 9.1 and 2.7 mg Ni/g MLSS, respectively. In addition, chronic toxicity of nickel to nitrification of low ammonia synthetic wastewater was investigated at 10°C in two sequencing batch reactors（SBRs）. Long-term SBRs operation and short-term batch tests were comparable with respect to the extent of inhibition and corresponding Ni/MLSS ratio. The μmax, b, and Ko of AOB were 0.16 day-1, 0.098 day-1 and 2.08 mg O2/L after long-term acclimatization to nickel of 1 mg/L at 10°C, high dissolved oxygen（DO）（7 mg/L） and long solids retention time（SRT） of 63–70 days. Acute nickel toxicity of nitrifying bacteria was completely reversible.

论文目录

• Introduction
• 1. Methodology
•   1.1. Nitrification reactors
•   1.2. Syntheticwastewaterandactivatedsludge characteristics
•   1.3. Analytical methods
•   1.4. Online batch tests
•   1.5. Offline batch tests
•   1.6. Short-term nickel inhibition modeling
•   1.7. Acute toxicity reversibility tests
•   1.8. Calculation of nickel speciation
•   1.9. Statistical analysis
• 2. Results and discussion
•   2.1. SBR performance
•   2.2. Online batch tests
•   2.3. Offline batch acute toxicity tests
•   2.4. Reversibility of acute nickel toxicity
•   2.5. Comparison of chronic and acute toxicity
•   2.6. Comparison with literature
• 3. Conclusions
• Conflicts of interest
• Appendix A.Supplementary data

文章来源

类型: 期刊论文

作者: Xiaoguang Liu,Mohammad M.I.Chowdhury,Masuduz Zaman,Mingu Kim,George Nakhla

来源: Journal of Environmental Sciences 2019年08期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 环境科学与资源利用

单位: Department of Civil and Environmental Engineering, University of Western Ontario,Department of Chemical and Biochemical Engineering, University of Western Ontario

基金: supported by the Natural Sciences and Engineering Research Council of Canada(No.CRDPJ 458990-13)

分类号: X703

页码: 169-178

总页数: 10

文件大小: 292K

下载量: 16