|
1
|
Du Q, Zhangsun X, Cao J, Zhang F, Huang T. Water-lifting aerator coupled with sponge iron-enhanced biological aerobic denitrification to remove nitrogen in low C/N water source reservoirs: effect and mechanism. ENVIRONMENTAL RESEARCH 2025; 277:121557. [PMID: 40209992 DOI: 10.1016/j.envres.2025.121557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2025] [Revised: 03/30/2025] [Accepted: 04/05/2025] [Indexed: 04/12/2025]
Abstract
Nitrogen pollution in drinking water reservoirs is an urgent problem faced all over the world. This study investigated the effect and mechanism of sponge iron (SI) as inorganic electron donors to drive biological aerobic denitrification coupled with water-lifting aerator system (WLASI) for water quality improvement in low C/N water source reservoirs. Targeted pollutants were significantly removed in the WLASI system (30.97 % for total nitrogen, 76.31 % for total phosphorus, 13.35 % for chemical oxygen demand, 97.63 % for 2-methylisoborneol, 93.59 % for algae density). The study found that in the water column of WLASI system, the diversity and relative abundance of aerobic denitrifiers were considerably enhanced, such as Mycobacterium and hgcI_clade, relative abundance of periplasmic nitrate reductase (NAP) and nitrite reductase (NIR) associated with denitrification were 3.65 and 2.15 times higher in day-32 than in day-0. Furthermore, the enrichment of the napAB and nirKS genes, which encodes the synthesis of NAP and NIR in the WLASI system. The findings indicate the WLASI system achieves nitrogen removal through the enhancement of microorganisms, and represents a promising and innovative in-situ remediation method for reservoirs.
Collapse
Affiliation(s)
- Quanjie Du
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Xuanzi Zhangsun
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Jian Cao
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Fei Zhang
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Tinglin Huang
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
| |
Collapse
|
|
2
|
Wang H, Sun Y, Zhou X, Zhu C, Wang X, Abbasi HN, Geng H, Zhu G, Wang X, Dai H. Simultaneous removal of nitrogen and phosphorus by aerobic denitrifying Paracoccus versutus JUST-3. BIORESOURCE TECHNOLOGY 2025; 428:132457. [PMID: 40164357 DOI: 10.1016/j.biortech.2025.132457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2025] [Revised: 03/25/2025] [Accepted: 03/26/2025] [Indexed: 04/02/2025]
Abstract
Strain JUST-3, exhibiting high-efficiency simultaneous nitrogen and phosphorus removal under aerobic conditions, was isolated and identified as Paracoccus versutus based on 16S rDNA gene sequencing and comprehensive physiological and biochemical analysis. The strain demonstrated optimal performance when cultured with sodium acetate as carbon source under the following conditions: C/N ratio of 10, P/N ratio of 0.2, 35 °C, and pH of 8.0. The variations in intermediate metabolites, the activity of functional enzymes, and the nitrogen/phosphorus balance experiments elucidated the pathways in nitrogen and phosphorus removal under aerobic conditions. Exogenous signal molecules (＜50 nmol/L) could promote growth, enhance aerobic denitrification, and improve simultaneous nitrogen and phosphorus performance. The identification of signaling molecules represents a significant breakthrough, revealing novel regulatory mechanisms in microbial quorum-sensing systems and enabling precise control of microbial community behaviors. This study expands the application of aerobic denitrification and phosphorus removal technology, laying the foundation for wastewater treatment.
Collapse
Affiliation(s)
- Haoyun Wang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China.
| | - Yang Sun
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China
| | - Xingkun Zhou
- Suzhou Drainage Co., Ltd, Suzhou 215000 Jiangsu Province, China.
| | - Chengyuan Zhu
- Suzhou Drainage Co., Ltd, Suzhou 215000 Jiangsu Province, China.
| | - Xiujie Wang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China.
| | - Haq Nawaz Abbasi
- Department of Environmental Science, Federal Urdu University of Arts, Science and Technology, Karachi, Pakistan.
| | - Hongya Geng
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518075, China.
| | - Guangcan Zhu
- School of Energy and Environment, Southeast University, Nanjing 210096, China.
| | - Xingang Wang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China.
| | - Hongliang Dai
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, China; School of Energy and Environment, Southeast University, Nanjing 210096, China.
| |
Collapse
|
|
3
|
Qiu C, Pan K, Wei Y, Zhou X, Su Q, Bi X, Ng H. Regulatory Mechanisms of Exogenous Acyl-Homoserine Lactones in the Aerobic Ammonia Oxidation Process Under Stress Conditions. Microorganisms 2025; 13:663. [PMID: 40142555 PMCID: PMC11946751 DOI: 10.3390/microorganisms13030663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2025] [Revised: 03/12/2025] [Accepted: 03/13/2025] [Indexed: 03/28/2025] Open
Abstract
This study investigated the mechanism by which N-acyl-homoserine lactone (AHL) signaling molecules influence ammonia-oxidizing microorganisms (AOMs) under inhibitory conditions. In laboratory-scale sequential batch reactors (SBRs), the effects of different AHLs (C6-HSL and C8-HSL) on the metabolic activity, microbial community structure, and quorum sensing (QS) system response of AOMs were examined. Caffeic acid, 1-octyne, and allylthiourea were used as ammoxidation inhibitors. The results indicated that under inhibitory conditions, AHLs effectively reduced the loss of ammonia oxidation activity and enhanced the resistance of AOMs to unfavorable environments. Additionally, AHLs enriched AOMs in the microbial community, wherein C6-HSL significantly increased the abundance of amoA genes in AOMs. Furthermore, AHLs maintained the activity of QS-related genes and preserved the communication ability between microorganisms. Correlation analysis revealed a positive relationship between AOMs and QS functional bacteria, suggesting that AHLs can effectively regulate the ammonia oxidation process. Overall, exogenous AHLs can improve the metabolic activity and competitive survival of AOMs under inhibitory conditions.
Collapse
Affiliation(s)
- Chen Qiu
- State and Local Joint Engineering Research Centre of Urban Wastewater Treatment and Reclamation in China, Qingdao University of Technology, Qingdao 266033, China; (C.Q.); (K.P.); (Y.W.); (X.Z.)
| | - Kailing Pan
- State and Local Joint Engineering Research Centre of Urban Wastewater Treatment and Reclamation in China, Qingdao University of Technology, Qingdao 266033, China; (C.Q.); (K.P.); (Y.W.); (X.Z.)
| | - Yuxuan Wei
- State and Local Joint Engineering Research Centre of Urban Wastewater Treatment and Reclamation in China, Qingdao University of Technology, Qingdao 266033, China; (C.Q.); (K.P.); (Y.W.); (X.Z.)
| | - Xiaolin Zhou
- State and Local Joint Engineering Research Centre of Urban Wastewater Treatment and Reclamation in China, Qingdao University of Technology, Qingdao 266033, China; (C.Q.); (K.P.); (Y.W.); (X.Z.)
| | - Qingxian Su
- Centre for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai, Zhuhai 519087, China
| | - Xuejun Bi
- State and Local Joint Engineering Research Centre of Urban Wastewater Treatment and Reclamation in China, Qingdao University of Technology, Qingdao 266033, China; (C.Q.); (K.P.); (Y.W.); (X.Z.)
| | - Howyong Ng
- Centre for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai, Zhuhai 519087, China
| |
Collapse
|