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Cheng W, Yin Y, Li Y, Li B, Liu D, Ye L, Fu C. Nitrogen removal by a strengthened comprehensive floating bed with embedded pellets made by a newly isolated Pseudomonas sp. Y1. ENVIRONMENTAL TECHNOLOGY 2024; 45:208-220. [PMID: 35876098 DOI: 10.1080/09593330.2022.2102940] [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: 05/24/2022] [Accepted: 07/09/2022] [Indexed: 06/15/2023]
Abstract
A newly heterotrophic nitrification aerobic denitrification(HN-AD) bacterium Pseudomonas sp. Y1 with highly nitrogen removal ability was isolated from the activated sludge, TN removal rate of which was 99.73%. In this study, two types of different ecology floating bed systems were designed to achieve efficient nitrogen removal in the urban eutrophic landscape water body, one is the comprehensive ecological floating bed(CEFB) system with only Lythrum salicari and the other is the strengthened comprehensive ecological floating bed (SCEFB) system with both Lythrum and embedded pellets made by Y1. The TN removal rates of the CEFB system were 33.82%, 83.84% and 88.91% at 8±1℃, 15±1℃ and 25±1℃, respectively, while the TN removal rates of the SCEFB system increased by nearly 40%, 16% and 11% at the same environment, respectively. The result shows that the SCEFB system can purify the simulated water from surface water body class V to class IV. Thus it has a broad application prospect in the urban eutrophic landscape water body.
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Affiliation(s)
- Wanyun Cheng
- School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, People's Republic of China
| | - Yixin Yin
- School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, People's Republic of China
- Shanghai Honess Environmental Technology Co.,Ltd., Shanghai, People's Republic of China
| | - Ye Li
- School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, People's Republic of China
| | - Bolin Li
- School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, People's Republic of China
| | - Dongxue Liu
- School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, People's Republic of China
| | - Lingfeng Ye
- School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, People's Republic of China
| | - Chengbin Fu
- School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan, People's Republic of China
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Wu Q, Chen Y, He Y, Cheng Q, Wu Q, Liu Z, Li Y, Yang Z, Tan Y, Yuan Y. Enhanced nitrogen and phosphorus removal by a novel ecological floating bed integrated with three-dimensional biofilm electrode system. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 348:119346. [PMID: 37866187 DOI: 10.1016/j.jenvman.2023.119346] [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: 07/26/2023] [Revised: 09/23/2023] [Accepted: 10/14/2023] [Indexed: 10/24/2023]
Abstract
The ecological floating bed (EFB) has been used extensively for the purification of eutrophication water. However, the traditional EFB (T-EFB) often exhibits a decline in nitrogen and phosphorus removal because of the limited adsorption capacity of fillers and inadequate electron donors. In the present study, a series of electrolysis-ecological floating beds (EC-EFBs) were constructed to investigate the decontamination performance of conventional pollutants. EC-EFB outperformed T-EFB in terms of nitrogen and phosphorus removal. Its removal efficiency of total nitrogen and total phosphorus was 20.51-32.95% and 45.06-96.20%, which were higher than that in T-EFB.. Moreover, the plants in EC-EFB demonstrated higher metabolic activity than those in T-EFB. Under the electrolysis condition of 0.51 mA/cm2 for 24 h, the malondialdehyde content and superoxide dismutase activity in EC-EFB were 6.08 nmol/g and 22.61 U/g, which were significantly lower compared to T-EFB (38.65 nmol/g and 26.13 U/g). And the soluble protein content of plant leaves increased from 3.31 mg/g to 5.72 mg/g in EC-EFB. Microbial analysis revealed that electrolysis could significantly change the microbial community and facilitate the proliferation of nitrogen-functional microbes, such as Thermomonas, Hydrogenophaga, Deinococcus, and Zoogloea. It is important to highlight that the hydrogen evolution reaction at the cathode area facilitated phosphorus removal in EC-EFB, thereby inhibiting phosphorus leaching. This study provides a promising and innovative technology for the purification of eutrophic water.
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Affiliation(s)
- Qingyu Wu
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Yao Chen
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China; Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing, 400074, China.
| | - Yang He
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Qiming Cheng
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Qiong Wu
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Zhen Liu
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China; Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Yunqing Li
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Zhenmei Yang
- Jiangjin Ecological Environment Monitoring Station, Chongqing, 402260, China
| | - Yuqing Tan
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Ying Yuan
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
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Zhu J, Wei R, Wang X, Jiang X, Wang M, Yang Y, Yang L. The ppk-expressing transgenic rice floating bed improves P removal in slightly polluted water. ENVIRONMENTAL RESEARCH 2023; 231:116261. [PMID: 37245571 DOI: 10.1016/j.envres.2023.116261] [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: 02/03/2023] [Revised: 05/15/2023] [Accepted: 05/26/2023] [Indexed: 05/30/2023]
Abstract
With significant economic advantages, the plant floating bed has been widely utilized in the ecological remediation of eutrophic water because of the excessive phosphorus (P) and nitrogen discharge in China. Previous research has demonstrated that polyphosphate kinase (ppk)-expressing transgenic rice (Oryza sativa L. ssp. japonica) (ETR) can increase the P absorption capacity to support rice growth and boost rice yield. In this study, the floating beds of ETR with single copy line (ETRS) and double copy line (ETRD) are built to investigate their capacity to remove aqueous P in slightly polluted water. Compared with the wild type Nipponbare (WT) floating bed, the ETR floating beds greatly reduce the total P concentration in slightly polluted water though the ETR floating beds have the same removal rates of chlorophyll-a, NO3--N, and total nitrogen in slightly polluted water. The P uptake rate of ETRD on the floating bed is 72.37% in slightly polluted water, which is higher than that of ETRS and WT on the floating beds. Polyphosphate (polyP) synthesis is a critical factor for the excessive phosphate uptake of ETR on the floating beds. The synthesis of polyP decreases the level of free intracellular phosphate (Pi) in ETR on the floating beds, simulating the phosphate starvation signaling. The OsPHR2 expression in the shoot and root of ETR on the floating bed increased, and the corresponding P metabolism gene expression in ETR was changed, which promoted Pi uptake by ETR in slightly polluted water. The Pi accumulation further promoted the growth of ETR on the floating beds. These findings highlight that the ETR floating beds, especially ETRD floating bed, have significant potential for P removal and can be exploited as a novel method for phytoremediation in slightly polluted water.
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Affiliation(s)
- Jinling Zhu
- State Key Laboratory of Pollution Control and Resource Reuse, State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River, School of Environment, Nanjing University, Nanjing, 210023, PR China
| | - Ruping Wei
- State Key Laboratory of Pollution Control and Resource Reuse, State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River, School of Environment, Nanjing University, Nanjing, 210023, PR China
| | - Xin Wang
- School of Science, China Pharmaceutical University, Nanjing, 211198, PR China
| | - Xue Jiang
- State Key Laboratory of Pollution Control and Resource Reuse, State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River, School of Environment, Nanjing University, Nanjing, 210023, PR China
| | - Mengmeng Wang
- State Key Laboratory of Pollution Control and Resource Reuse, State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River, School of Environment, Nanjing University, Nanjing, 210023, PR China
| | - Yicheng Yang
- Agricultural and Biological Engineering Department, University of Florida, Gainesville, FL, 32611, United States
| | - Liuyan Yang
- State Key Laboratory of Pollution Control and Resource Reuse, State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River, School of Environment, Nanjing University, Nanjing, 210023, PR China.
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Zheng C, Chen C, Gao Y, Gan L, Zhang W, Yang L. Sex-specific responses of the reproductive system of zebrafish (Danio rerio) to electrolysis. Comp Biochem Physiol C Toxicol Pharmacol 2022; 255:109294. [PMID: 35131430 DOI: 10.1016/j.cbpc.2022.109294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/09/2022] [Accepted: 01/30/2022] [Indexed: 11/17/2022]
Abstract
Adult zebrafish (Danio rerio) were electrolyzed at different current densities to explore the effects of electrolysis on their reproductive system, especially on embryo production, and to uncover the molecular mechanism of changes in sex hormone and vitellogenin (VTG) levels. The results showed that embryo reproduction of zebrafish was reduced at a current density of 0.64 A/m2 after 28 days of exposure. In addition, the 17β-estradiol concentration significantly decreased and the testosterone concentration increased in female zebrafish above 0.53 A/m2. However, opposite trends were observed in male zebrafish. The VTG concentration was reduced considerably in the livers of female zebrafish in the 0.64 A/m2 electrolysis group (p < 0.05). In addition, the mRNA expression of hormone-regulating genes was significantly altered in female and male zebrafish when the current density was greater than 0.53 A/m2, and their change trends were sex-dependent. The genes expression levels of vtg1 and esr1 were downregulated in female zebrafish. However, the gene expression of esr1 and cyp19a was upregulated in male zebrafish. These changes were related to disruption in the hormone balance and VTG levels of adult zebrafish. Thus, electrolysis could cause masculinization of female zebrafish and feminization of male zebrafish. Nonetheless, there were few influences on the hormone levels and reproduction rate of adult zebrafish at the threshold of 0.26 A/m2. Thus, the current density of electrolysis needs to be controlled within a specific range to reduce its harmful effects on the reproductive system of aquatic animals.
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Affiliation(s)
- Chaoqun Zheng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Cheng Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Yan Gao
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Lin Gan
- Nanjing Hydraulic Research Institute, Nanjing 210017, PR China
| | - Wen Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Liuyan Yang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
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