AI Article Synopsis
Article Abstract
Biological Mn(II) removal usually involves adsorption and precipitation of Mn(II) in the form of various minerals. Manganese oxides (MnO) formation through the activity of Mn(II) oxidation bacteria (MnOB) contributes to the majority of Mn(II) removal. However, whether other bacterial-mediated pathway could couple or competitive with Mn(II) oxidation during Mn(II) removal is scarcely reported. In this study, we reported a competitive Mn(II) removal occurred in nutrient-rich condition during the indirect Mn(II) oxidation of Lysinibacillus sp. MHQ-1, i.e., microbially-induced carbonate precipitation (MICP). In the presence of 1 mM Mn(II), 39.4% of free Mn(II) converted to MnCO(s) quickly within 100 h, and then 11.6% of initial Mn(II) slowly oxidized to MnO within 442 h. The urease activity assay and the genome sequencing confirmed the existence of urease and the absence of Mn(II)-oxidizing enzymes in the genome of strain MHQ-1. The urease catalyzed the formation of carbonate ion that reacts with Mn(II) and the formed ammonia raises the pH to initiate indirect Mn(II) oxidation. Genome survey suggests the urease widely exists in various Mn(II)-oxidizing bacteria (MnOB), emphasizing the importance to reconsider the composition, stability and environmental effects of biological Mn(II) removal products in nutrient-rich environment.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.envres.2023.117373 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Optimized Mn cycle enhanced synchronous removal of nitrate and antibiotics driven by manganese oxides/solid carbon composites: Microbiota assembly patterns and electron transport.
J Hazard Mater
December 2024
Department of Environmental Science, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China; The Key Laboratory of Water and Sediment Sciences (Peking University), Ministry of Education, Beijing 100871, PR China. Electronic address:
The reactive substance consisting manganese oxides (MnOx) and solid carbon have been reported to be effective in polishing secondary wastewater; however, the treatment characteristics and mechanism remains limited. In this study, MnOx/carbon (Mn-C) composites were applied in biofilters to evaluate simultaneous removal of nitrate and sulfamethoxazole (SMX), with the single carbon composites as control. Results showed that the effluent concentrations of NO-N and SMX were below 2.
View Article and Find Full Text PDFEffect of metal ions on moving bed biofilm reactor (MBBR) for nitrogen removal in wastewater: Performance characteristics, flocculation efficiency and bacterial community.
Environ Res
December 2024
College of Resources and Environment, Anhui Agricultural University, Anhui Provincial Key Laboratory of Hazardous Factors and Risk Control of Agri-food Quality Safety, Hefei, 230036, PR China. Electronic address:
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-N and NO-N by MBBR were explored under the influence of Mn(II), Cu(II), and Fe(II) at carbon to nitrogen ratio of 5.
View Article and Find Full Text PDFEfficient degradation of tetracycline by Mn(III)-microbial complexes mediated by mnOx@ACF in sequencing batch reactors: performance, mechanism, and effect on microbial community structure.
Water Sci Technol
December 2024
School of Resources and Environment, Wuhan Textile University, Engineering Research Centre for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430073, China; State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China E-mail:
Engineered nanomaterials are widely used in water and wastewater treatment processes, and minimizing their adverse effects on biological treatment processes in wastewater treatment plants has become the primary focus. In this study, activated carbon fiber (ACF)-loaded manganese oxide nanomaterials (MnOx@ACF) were synthesized. A small-scale sequencing batch reactor (SBR) was constructed to simulate the synergistic degradation of pollutants by nanomaterials and microorganisms and the effects of nanomaterials on the structure of the microbial community in a wastewater treatment plant.
View Article and Find Full Text PDFMicrobial-induced reassembly of phosphate sol: New insight into the removal and fixation of divalent manganese in natural aquatic environment.
Chemosphere
December 2024
Institute of Urban Environment, Chinese Academy of Sciences, 1799th Jimei Road, Xiamen, 361021, China.
The commonly used precipitation method struggles to effectively remove low-concentration heavy metals from water. Herein, we demonstrate that the formation of non-settleable phosphate sols at a low low-concentration is the main reason by using phosphate precipitation as an example and report a new method called microbial-induced reassembly (MIR) of the phosphate sols for the removal and fixation of divalent manganese (Mn(II)) from low-concentration wastewater under neutral conditions. Under the induction of microorganisms, the Mn(PO) sols formed in low Mn(II) concentration could be reassembled into larger and flower-like precipitates with good settleability, allowing for the removal and fixation of low-concentration Mn(II) through natural settlement.
View Article and Find Full Text PDFEffects of batch and continuous-flow operation on biotreatment of Mn(II)-containing mine drainage.
J Environ Sci (China)
June 2025
Japan Organization for Metals and Energy Security (JOGMEC), Tokyo 105-0001, Japan.
Article Synopsis
- The study compares the effectiveness of sequencing-batch reactors (SBRs) and continuous-flow reactors (CFRs) in removing dissolved manganese (Mn) from mine drainage using manganese-oxidizing bacteria.
- SBRs showed superior performance, achieving over 66% Mn removal in four weeks, while CFRs reached only about 13.6%, highlighting higher microbial activity in SBRs during the start-up phase.
- Both reactors produced mixed manganese-oxide deposits, but SBRs had a slightly higher average oxidation valence, with different microbial communities dominating the early stages and steady state, indicating distinct pathways for manganese oxidation.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!