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The treatment of black-odorous water using tower bipolar electro-flocculation including the removal of phosphorus,turbidity,sulfion,and oxygen enrichment

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Frontiers of Environmental Science & Engineering 2021年第2期15卷 19-31页

作者： Huan He Qinjin Yu Chaochao Lai Chen Zhang Muhan Liu Bin Huang Hongping Pu Xuejun Pan Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China Yunnan Provincial Key Laboratory of Carbon Sequestration and Pollution Control in Soils Kunming 650500China

The large amount of municipal wastewater discharged into urban rivers sometimes exceeds the rivers’self-purification capacity leading to black-odorous polluted water.Electro-flocculation has emerged as a powerful remediation technology.Electro-flocculation in a bubble column tower with a bipolar electrode(BPE)was tested in an attempt to overcome the high resistance and weak gas-floatation observed with a monopolar electrode(MPE)in treating such water.The BPE reactor tested had a Ti/Ta2O_(5)-IrO_(2)anode and a graphite cathode with an iron or aluminum bipolar electrode suspended between them.It was tested for its ability to reduce turbidity,phosphate and sulphion and to increase the concentration of dissolved oxygen.The inclusion of the bipolar electrode was found to distinctly improved the system’s conductivity.The system’s electro-flocculation and electrical floatation removed turbidity,phosphate and sulphion completely,and the dissolved oxygen level improved from 0.29 to 6.28 mg/L.An aluminum bipolar electrode performed better than an iron one.Changes in the structure of the microbial community confirmed a significant improvement in water quality.

关键词： black-odorous water Bipolar electrodes Flocculation Floatation Oxygen enrichment Turbidity

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Alterations in microbial community during the remediation of a black-odorous stream by acclimated composite microorganisms

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Journal of Environmental Sciences 2022年第8期34卷 181-193页

作者： Feng Shi Zongli Liu Jialin Li Huiwang Gao Song Qin Jingjing Guo Key Lab of Coastal Biology and Biological Resource Conservation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Qingdao HOOH Environmental Protection Technology Co.Ltd.Qingdao 266073 China

Microbial application is an efficient, economical, and ecofriendly method for remediating black-odorous rivers. In this study, the field treatment effect and microbial community changes were monitored during remediation by the acclimated complex microorganisms of a typical black-odorous stream. After the treatment, the total phosphorus and ammonia contents decreased by 74.0% and 76.3% and the concentrations of dissolved oxygen increased from 1.65 to 4.90 mg/L, indicating the effectiveness of the acclimated composite microorganisms. The proportion of Bacteroidetes decreased significantly by 48.1% and that of Firmicutes increased by 2.23% on average, and the microbial diversity index first increased and then tended to be uniform. Redundancy analysis demonstrated that the pH,dissolved oxygen, and oxidation-reduction potential together determined the composition of the microbial communities(p black odor.

关键词： black-odorous water Composite microorganisms Microbial community Environmental impact factors In-siu bioremediation

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