Shuying Wang , Meixiu Lu , Shutong Dong , Shengtao Liu , Shu Gao , Yuxiang Lu , Fuyao Wei , Tingting Huang , Jieying Liu , Chengyuan Su
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引用次数: 0
Abstract
Water pollution from nitrogen/sulfur compounds threatens aquatic ecosystems and human health. In this study, the removal of chemical oxygen demand (COD), sulfate, and NH4+ -N from wastewater was compared between the constructed rapid infiltration systems (CRIS) using coke (group A), modified red mud and coke (group B), and manganese-modified coke (group C). When the concentration of sulfate was increased from 50 to 100 mg/L, the average removal rates of sulfate in groups A, B, and C were 51.8 ± 9.90 %, 53.4 ± 5.99 %, and 64.9 ± 6.50 %, and the average removal rates of NH4+-N were 41.5 ± 5.69 %, 60.1 ± 5.15 %, and 50.5 ± 4.47 %. The manganese-modified coke could strengthen the treatment efficiency of the CRIS for sulfate. Microbial analyses revealed that Proteobacteria (>50 % abundance) dominated all systems, and the abundance of Brucella increased from 0.83 % to 3.53 % in group C. Furthermore, the metabolic mechanisms indicated that group C enhanced sulfur metabolism (53.3 % increase in sulfite reduction) and nitrogen cycling (elevated glycolysis/ammonia oxidation). In addition, the electron transfer efficiency in the modified red mud group was improved. These findings highlight that through manganese modification, the CRIS could coordinate sulfur and nitrogen metabolic pathways through microbial regulation, thereby providing a feasible solution for synergistic control of multiple pollutants in complex wastewater.
期刊介绍:
The Biochemical Engineering Journal aims to promote progress in the crucial chemical engineering aspects of the development of biological processes associated with everything from raw materials preparation to product recovery relevant to industries as diverse as medical/healthcare, industrial biotechnology, and environmental biotechnology.
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