Effect of metal ions on moving bed biofilm reactor (MBBR) for nitrogen removal in wastewater: Performance characteristics, flocculation efficiency and bacterial community

IF 7.7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Research Pub Date : 2024-12-17 DOI:10.1016/j.envres.2024.120655

Mengcheng Sheng, Jiamin Liu, Yiyang Zhou, Sicheng Shao

{"title":"Effect of metal ions on moving bed biofilm reactor (MBBR) for nitrogen removal in wastewater: Performance characteristics, flocculation efficiency and bacterial community","authors":"Mengcheng Sheng, Jiamin Liu, Yiyang Zhou, Sicheng Shao","doi":"10.1016/j.envres.2024.120655","DOIUrl":null,"url":null,"abstract":"<div><div>Advanced operational moving bed biofilm reactor (MBBR) has demonstrated to achieve simultaneous sludge yield minimization and pollutants removal. However, effect of different metal ions on MBBR performance for nutrients removal in wastewater under low carbon to nitrogen ratio is still unclear. Fate of NH<sub>4</sub><sup>+</sup>-N and NO<sub>3</sub><sup>−</sup>-N by MBBR were explored under the influence of Mn(II), Cu(II), and Fe(II) at carbon to nitrogen ratio of 5. The result showed that Mn(II) and Fe(II) significantly improved the NH<sub>4</sub><sup>+</sup>-N and TN removal with a removal ratio of 71.0% and 80.5%, and 77.8% and 87.5% compared to the absence of added metal ions, and Cu(II) reduced the nitrogen removal. Biofilm characteristics including extracellular polymeric substances (EPS), electron transport system activity, and reactive oxygen species were investigated. The result indicated that both Mn(II) and Fe(II) enhanced the extracellular polymeric substances activity, electron transfer, and flocculation efficiency and hydrophilicity of biofilm. Furthermore, nitrification and denitrification processes of MBBR were further evaluated by X-ray photoelectron spectroscopy, fourier transform infrared reflection, cyclic voltammetry, differential pulse voltammetry, and Tafel curves. The result revealed that the main functional groups (e.g., C=O, C-O, and O-C=O bonds), and manganese and iron cycling might be involved in the nitrogen and metal ions removal. Finally, microbial community and co-occurrence network of biofilm were studied, showing that Proteobacteria and Bacteroidetes were identified as the dominant phyla for nitrogen and metal ions removal. This study aimed to provide the technical support for the startup and engineering applications of MBBR in wastewater treatment.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"267 ","pages":"Article 120655"},"PeriodicalIF":7.7000,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Research","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0013935124025593","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

Advanced operational moving bed biofilm reactor (MBBR) has demonstrated to achieve simultaneous sludge yield minimization and pollutants removal. However, effect of different metal ions on MBBR performance for nutrients removal in wastewater under low carbon to nitrogen ratio is still unclear. Fate of NH₄⁺-N and NO₃⁻-N by MBBR were explored under the influence of Mn(II), Cu(II), and Fe(II) at carbon to nitrogen ratio of 5. The result showed that Mn(II) and Fe(II) significantly improved the NH₄⁺-N and TN removal with a removal ratio of 71.0% and 80.5%, and 77.8% and 87.5% compared to the absence of added metal ions, and Cu(II) reduced the nitrogen removal. Biofilm characteristics including extracellular polymeric substances (EPS), electron transport system activity, and reactive oxygen species were investigated. The result indicated that both Mn(II) and Fe(II) enhanced the extracellular polymeric substances activity, electron transfer, and flocculation efficiency and hydrophilicity of biofilm. Furthermore, nitrification and denitrification processes of MBBR were further evaluated by X-ray photoelectron spectroscopy, fourier transform infrared reflection, cyclic voltammetry, differential pulse voltammetry, and Tafel curves. The result revealed that the main functional groups (e.g., C=O, C-O, and O-C=O bonds), and manganese and iron cycling might be involved in the nitrogen and metal ions removal. Finally, microbial community and co-occurrence network of biofilm were studied, showing that Proteobacteria and Bacteroidetes were identified as the dominant phyla for nitrogen and metal ions removal. This study aimed to provide the technical support for the startup and engineering applications of MBBR in wastewater treatment.

Abstract Image

查看原文本刊更多论文

金属离子对移动床生物膜反应器（MBBR）去除废水中氮的影响：性能特征、絮凝效果及细菌群落

先进的操作移动床生物膜反应器（MBBR）已被证明可以同时实现污泥产量最小化和污染物去除。然而，在低碳氮比条件下，不同金属离子对MBBR去除废水中营养物性能的影响尚不清楚。在Mn（II）、Cu（II）和Fe（II）的影响下，在碳氮比为5的条件下，探讨了MBBR对NH4+-N和NO3——N的去除率。结果表明，Mn（II）和Fe（II）显著提高了NH4+-N和TN的去除率，与未添加金属离子相比去除率分别为71.0%和80.5%，77.8%和87.5%,Cu（II）降低了氮的去除率。研究了生物膜的特性，包括胞外聚合物（EPS）、电子传递系统活性和活性氧。结果表明，Mn（II）和Fe（II）均能增强生物膜的胞外高分子活性、电子转移、絮凝效率和亲水性。利用x射线光电子能谱、傅里叶变换红外反射、循环伏安法、差分脉冲伏安法和Tafel曲线对MBBR的硝化和反硝化过程进行了评价。结果表明，主要官能团（如C=O、C-O和O-C=O键）和锰、铁循环可能参与了氮和金属离子的去除。最后，对生物膜的微生物群落和共生网络进行了研究，发现Proteobacteria和Bacteroidetes是去除氮和金属离子的优势门。本研究旨在为MBBR在污水处理中的启动和工程应用提供技术支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Environmental Research 环境科学-公共卫生、环境卫生与职业卫生

CiteScore

12.60

自引率

8.40%

发文量

2480

审稿时长

4.7 months

期刊介绍： The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.