Effect of dissolved oxygen on biological denitrification using biodegradable plastic as the carbon source

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Zhang, Xucai^1,2 ; Zhang, Jianmei^1

Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, College of Resources and Environment, Yangtze University, Wuhan

430100, China^1

School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing

100083, China^2

关键词: Biodegradable plastics;    Biological denitrification;    Carbon source;    Low oxygen;    Low oxygen conditions;    Nitrate removal;    Removal rate;    Treatment group;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/3/032015/pdf
DOI  :  10.1088/1755-1315/121/3/032015

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Biological denitrification is currently a common approach to remove nitrate from wastewater. This study was conducted to evaluate the influence of dissolved oxygen on denitrification in wastewater treatment using biodegradable plastic as carbon source by designing the aerated, anoxic, and low-oxygen experimental treatment groups. The results showed that the removal rates of nitrate in anoxic and low-oxygen groups were 30.6 g NO3--Nm-3 d-1 and 30.8 g NO3--N m-3 d-1 at 83 h, respectively, both of which were higher than that of the aerated group. There was no significant difference between the anoxic and low-oxygen treatment groups for the nitrate removal. Additional, the nitrite accumulated during the experiments, and the nitrite concentrations in anoxic and aerated groups were lower than those in low-oxygen group. No nitrite was detected in all groups at the end of the experiments. These findings indicated that dissolved oxygen has important influence on denitrification, and anoxic and low-oxygen conditions can support completely denitrification when using BP as carbon source in nitrate-polluted wastewater treatment.