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Zhang X, Wang R, Wang H, Xu Z, Feng C, Zhao F. CH 4 control and nitrogen removal from constructed wetlands by plant combination. CHEMOSPHERE 2024; 355:141898. [PMID: 38579951 DOI: 10.1016/j.chemosphere.2024.141898] [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: 12/07/2023] [Revised: 03/19/2024] [Accepted: 04/02/2024] [Indexed: 04/07/2024]
Abstract
Global warming trend is accelerating. This study proposes a green and economical methane (CH4) control strategy by plant combination in constructed wetlands (CWs). In this study, a single planting of Acorus calamus L. hybrid constructed wetland (HCW-A) and a mixed planting of Acorus calamus L. and Eichhornia crassipes (Mart.) Solms hybrid constructed wetland (HCW-EA) were constructed. The differences in nitrogen removal performance and CH4 emissions between HCW-A and HCW-EA were compared and analyzed. The findings indicated that HCW-EA demonstrated significant improvements over HCW-A, with NH4+-N and TN removal rates increasing by 21.61% and 16.38% respectively, and CH4 emissions decreased by 43.36%. The microbiological analysis results showed that plant combination promoted the enrichment of Proteobacteria, Alphaproteobacteria and Bacillus. More nitrifying bacteria carrying nxrA genes and denitrifying bacteria carrying nirK genes accelerated the nitrogen transformation process. In addition, the absolute abundance ratio of pmoA/mcrA increased, reducing the release of CH4.
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Affiliation(s)
- Xinwen Zhang
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China
| | - Rongzhen Wang
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China
| | - Hongxiu Wang
- Inspur General Software Co., Ltd, Jinan, 250101, China
| | - Zhenghe Xu
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China.
| | - Chengye Feng
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China
| | - Fangxing Zhao
- School of Water Conservancy and Environment, University of Jinan, Jinan, 250022, China
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2
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Jain M, Sai Kiran P, Ghosal PS, Gupta AK. Development of microbial fuel cell integrated constructed wetland (CMFC) for removal of paracetamol and diclofenac in hospital wastewater. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 344:118686. [PMID: 37536238 DOI: 10.1016/j.jenvman.2023.118686] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 07/10/2023] [Accepted: 07/25/2023] [Indexed: 08/05/2023]
Abstract
Hospital wastewater management has become a significant concern across the globe due to the presence of pharmaceutically active compounds (PhACs) and other toxic substances, which can potentially disrupt ecosystems. The presence of recalcitrant PhACs in hospital wastewater increases the difficulty level for conventional wastewater treatment systems. Furthermore, incorporating advanced oxidation-based treatment systems increase capital and operation costs. To reduce treatment costs, low-cost innovative technology, i.e., composite constructed wetland and microbial fuel cell system (CMFC), has been developed for higher treatment efficiency of PhACs in hospital wastewater along with simultaneous bioelectricity generation as an additional outcome. In this study, influencing operating parameters, such as initial chemical oxygen demand (COD), electrode spacing, and substrate-to-water-depth ratio, were optimized for two plant species: water hyacinth (WH) and duckweed (DW). The optimized systems were run in batch and continuous mode for WH-CMFC and DW-CMFC to treat synthetic hospital wastewater with paracetamol and diclofenac, and the bioelectricity generation was monitored. DW-CMFC system depicted better treatment efficiency and voltage generation as compared to WH-CMFC. In continuous mode, the DW-CMFC system exhibited a removal of 95.3% COD, 97.1% paracetamol, and 87.5% diclofenac. WH-CMFC and DW-CMFC achieved power densities of around 21.26 mW/m2 and 42.93 mW/m2, respectively. The fate of PhACs during and after treatment and toxicity analysis of the transformation products formed were also carried out. Higher bio-electricity generation and efficient wastewater treatment of the DW-CMFC make it a sustainable option for hospital wastewater management.
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Affiliation(s)
- Mahak Jain
- School of Water Resources, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
| | - Pilla Sai Kiran
- School of Water Resources, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
| | - Partha Sarathi Ghosal
- School of Water Resources, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
| | - Ashok Kumar Gupta
- Environmental Engineering Division, Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
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3
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Cui J, Li J, Cui J, Ruan Y, Liang Y, Wu Y, Chang Y, Liu X, Yao D. Hippuris vulgaris could replace Myriophyllum aquaticum for efficiently removing water phosphorus under low temperature conditions in China. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 339:117886. [PMID: 37084539 DOI: 10.1016/j.jenvman.2023.117886] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 03/31/2023] [Accepted: 04/04/2023] [Indexed: 05/03/2023]
Abstract
Phytoremediation is widely used for the restoration of aquatic environments. However, the phytoremediation effects and mechanisms of special submerged species of native aquatic plants, especially under low-temperature conditions, are not yet clear. In this study, two typical submerged plants, Myriophyllum aquaticum (M. aquaticum; an exotic species) and Hippuris vulgaris (H. vulgaris; a native species), in China were investigated for their phosphorus (P) removal efficiencies (REp) and the related mechanisms of phytophysiology and microorganisms in a low-temperature incubator (10 °C during the day and 2 °C at night). At an initial P level of 0.5 mg L-1, the two plants exhibited similar REp, with the highest values (73.5%-92.1%) observed on days 3-6. After 18 days, the residual P concentration in the water was less than the Grade III limit value (0.2 mg L-1; GB 3838-2002). However, M. aquaticum had a faster REp velocity than H. vulgaris at an initial P level of 3.0 mg L-1, which was attributed to the mechanisms of plant and its interactions with microorganisms. Compared to the control group, the superoxide dismutase activity of H. vulgaris was significantly increased and its catalase activity was decreased, whereas for that of M. aquaticum was the opposite. Micro region X-ray fluorescence analysis revealed that there may be synergic absorption effects between P, S, and K, and antagonistic absorption action between P and Mn in H. vulgaris. In addition, Acinetobacter, Novosphingobium and Pseudomonas were enriched at 3.0 mg L-1 P level with these two plants, but Chlorophyta only accumulated with H. vulgaris, respectively. Overall, the native species, H. vulgaris, could replace the exotic M. aquaticum to efficiently remove P from polluted water at low temperatures. These findings provide a theoretical foundation for submerged plants P removal capabilities, and the protection of local ecosystem diversity at low temperatures.
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Affiliation(s)
- Jianwei Cui
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing, 210014, China; Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing, 210014, China
| | - Jinfeng Li
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing, 210014, China; Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing, 210014, China
| | - Jian Cui
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing, 210014, China; Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing, 210014, China.
| | - Yang Ruan
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing, 210014, China; Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing, 210014, China
| | - Yu Liang
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing, 210014, China; Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing, 210014, China
| | - Yue Wu
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing, 210014, China; Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing, 210014, China
| | - Yajun Chang
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing, 210014, China; Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing, 210014, China
| | - Xiaojing Liu
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing, 210014, China; Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing, 210014, China
| | - Dongrui Yao
- Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, 210014, China; Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Nanjing, 210014, China; Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing, 210014, China.
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Wu D, Shen C, Cheng Y, Ding J, Li W. Phosphorus removal by aquatic vegetation in shallow eutrophic lakes: a laboratory study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:16166-16177. [PMID: 36178654 DOI: 10.1007/s11356-022-23403-z] [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: 03/31/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
Eutrophication in inland lakes is occurring frequently with the rapid urbanization, the increases in human population, and the intensive agricultural activities. Traditional management programs focusing on external nutrient reduction failed in recovery of certain aquatic environments where internal nutrient releases are substantial. In this study, we evaluated the effects of aquatic vegetation in altering the phosphorus concentrations in a shallow, eutrophic lake through laboratory flume experiments. Our measurements demonstrated that aquatic vegetation could effectively lower the phosphorus levels in the water column, and the average reduction reached 90% for submerged vegetation and 80% for emergent vegetation. The experimental results showed that the submerged vegetation was effective to reduce phosphorus concentrations in the top and mid layers of pore waters and sediments. Differently, the emergent vegetation would assimilate more phosphorus in the bottom layer due to its deep root distributions. The flowing-water environment favored phosphorus removal for emergent vegetation, while the submerged vegetation was more functional in static waters according to our observations. The flux results showed that phosphorus transports from water columns to leaves, roots to leaves, and sediments to roots were all inhibited in flowing-water environments for submerged vegetation. Oppositely, the fluxes of emergent vegetation groups were all enhanced in flowing waters. Our experiments could inform ecosystem management concerning the potentials of aquatic vegetation in nutrient removal at regional and lake-wide scales.
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Affiliation(s)
- Dan Wu
- Jiangsu Provincial Academy of Environmental Science, Nanjing, China
- Jiangsu Provincial Key Laboratory of Environmental Engineering, Nanjing, China
| | - Chunqi Shen
- College of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, China.
| | - Yu Cheng
- Key Laboratory of Integrated Regulation and Resources Development On Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, China
| | - Jue Ding
- Center for Eco-Environmental Research, Nanjing Hydraulic Research Institute, Nanjing, China
| | - Wei Li
- School of Public Administration, Zhejiang University of Finance & Economics, Hangzhou, Zhejiang, China
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Zhang C, Li Q, Zhang L, Zhang J. Responses of submerged macrophytes Vallisneria natans and epiphytic biofilm to floating plants Eichhornia crassipes in eutrophic water. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2021; 93:2237-2249. [PMID: 34091983 DOI: 10.1002/wer.1596] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 05/27/2021] [Accepted: 05/28/2021] [Indexed: 06/12/2023]
Abstract
The degeneration of submerged macrophytes and the invasion of Eichhornia crassipes (E. crassipes) destroyed the balance of aquatic ecosystems environments. In this study, responses of Vallisneria natans (V. natans) and the leaf-epiphytic biofilms to E. crassipes were analyzed to provide a technical scheme for V. natans restoration and E. crassipes control in eutrophic water. The results showed that a significant improvement of water quality achieved in 1100 ind·m-2 E. crassipes density group and TN removal rate reached 63.53%. The presence of E. crassipes changed the morphological characteristics of V. natans, which stimulated the adaptive mechanisms via promotion of shoot height and root length. Concentrations of the antioxidant enzymes, peroxidase, superoxide dismutase, and catalase in the V. natans leaves remained stable. But E. crassipes greatly increased the microbial diversity on V. natans leave biofilms. Furthermore, the greatest richness in bacterial community diversity was observed at 700, 1100, and 1200 ind·m-2 E. crassipes densities in heatmap, which was beneficial to the stability of the water ecological environment. These results showed that the combination of V. natans with E. crassipes of 1100 ind m-2 providing more favorable conditions for the growth and restoration of submerged macrophytes and improve the water quality. PRACTITIONER POINTS: The responses of submerged macrophytes to floating plants were studied. The optimal density of Eichhornia crassipes was 1100 ind m-2 . The biofilm microbial community changed in response to Eichhornia crassipes.
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Affiliation(s)
- Chen Zhang
- Department of Environmental Science and Engineering, Fudan University, Shanghai, China
| | - Qi Li
- Department of Environmental Science and Engineering, Fudan University, Shanghai, China
| | - Liu Zhang
- Anhui Academy of Environmental Science and Research, Hefei, China
| | - Jibiao Zhang
- Department of Environmental Science and Engineering, Fudan University, Shanghai, China
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Zhong Y, Lu X, Deng Z, Lu Z, Fu M. A 1232 bp upstream sequence of glutamine synthetase 1b from Eichhornia crassipes is a root-preferential promoter sequence. BMC PLANT BIOLOGY 2021; 21:66. [PMID: 33514320 PMCID: PMC7845104 DOI: 10.1186/s12870-021-02832-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 01/11/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Glutamine synthetase (GS) acts as a key enzyme in plant nitrogen (N) metabolism. It is important to understand the regulation of GS expression in plant. Promoters can initiate the transcription of its downstream gene. Eichhornia crassipes is a most prominent aquatic invasive plant, which has negative effects on environment and economic development. It also can be used in the bioremediation of pollutants present in water and the production of feeding and energy fuel. So identification and characterization of GS promoter in E. crassipes can help to elucidate its regulation mechanism of GS expression and further to control its N metabolism. RESULTS A 1232 bp genomic fragment upstream of EcGS1b sequence from E. crassipes (EcGS1b-P) has been cloned, analyzed and functionally characterized. TSSP-TCM software and PlantCARE analysis showed a TATA-box core element, a CAAT-box, root specific expression element, light regulation elements including chs-CMA1a, Box I, and Sp1 and other cis-acting elements in the sequence. Three 5'-deletion fragments of EcGS1b upstream sequence with 400 bp, 600 bp and 900 bp length and the 1232 bp fragment were used to drive the expression of β-glucuronidase (GUS) in tobacco. The quantitative test revealed that GUS activity decreased with the decreasing of the promoter length, which indicated that there were no negative regulated elements in the EcGS1-P. The GUS expressions of EcGS1b-P in roots were significantly higher than those in leaves and stems, indicating EcGS1b-P to be a root-preferential promoter. Real-time Quantitative Reverse Transcription-Polymerase Chain Reaction (qRT-PCR) analysis of EcGS1b gene also showed higher expression in the roots of E.crassipes than in stems and leaves. CONCLUSIONS EcGS1b-P is a root-preferential promoter sequence. It can specifically drive the transcription of its downstream gene in root. This study will help to elucidate the regulatory mechanisms of EcGS1b tissue-specific expression and further study its other regulatory mechanisms in order to utilize E.crassipes in remediation of eutrophic water and control its overgrowth from the point of nutrient metabolism.
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Affiliation(s)
- Yanshan Zhong
- Bioengineering Department, Biological and Pharmaceutical College, Guangdong University of Technology, Guangzhou, Guangdong, P.R. China, 510006
| | - Xiaodan Lu
- Bioengineering Department, Biological and Pharmaceutical College, Guangdong University of Technology, Guangzhou, Guangdong, P.R. China, 510006
| | - Zhiwei Deng
- Bioengineering Department, Biological and Pharmaceutical College, Guangdong University of Technology, Guangzhou, Guangdong, P.R. China, 510006
| | - Ziqing Lu
- Bioengineering Department, Biological and Pharmaceutical College, Guangdong University of Technology, Guangzhou, Guangdong, P.R. China, 510006
| | - Minghui Fu
- Bioengineering Department, Biological and Pharmaceutical College, Guangdong University of Technology, Guangzhou, Guangdong, P.R. China, 510006.
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Wang R, Wang Y, Sun S, Cai C, Zhang J. Discussing on "source-sink" landscape theory and phytoremediation for non-point source pollution control in China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:44797-44806. [PMID: 32975753 DOI: 10.1007/s11356-020-10952-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 09/20/2020] [Indexed: 06/11/2023]
Abstract
Water pollution is exacerbated due to irrational human activities in China. Restoring and rebuilding river basin ecosystems are major ecological strategies at present. Controlling the non-point source pollution (NPSP) by reasonable management of land use in the basin and phytoremediation of contaminated waters is the optimum approach. Thus, it is significant to study on the relationship that between landscape change and the aquatic environment, as well as further to analyze on the combined effect of the landscape and water quality. This paper describes the application and development of the "source-sink" landscape theory in China, and the role of the theory in controlling NPSP. From this perspective, a landscape capable of generating NPSP would be a "source" landscape, such as farmland, while another capable of preventing NPSP would be a "sink" landscape, such as forests and wetland. Applying the source-sink landscape theory, it is possible to exert the ecological benefits of the landscape while playing the esthetic value of the landscape. Also, the purification mechanism of plants in contaminated water is discussed. Besides, it is vital that research on water body restoration should focus not only on single discipline but also on integration and coordination between various ones such as ecology, environmental science, and geography to jointly push up researches related to water body phytoremediation. Hopefully, this paper could help to control water pollution from a new perspective, also to improve water environment and benefit human lives.
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Affiliation(s)
- Rongjia Wang
- Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, Zhejiang, 311400, People's Republic of China
| | - Ying Wang
- Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, Zhejiang, 311400, People's Republic of China
| | - Shiyong Sun
- Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, Zhejiang, 311400, People's Republic of China
| | - Chunju Cai
- International Centre for Bamboo and Rattan, Beijing, 100102, China
| | - Jianfeng Zhang
- Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou, Zhejiang, 311400, People's Republic of China.
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Castro YA, Agblevor FA. Biomethanation of invasive water hyacinth from eutrophic waters as a post weed management practice in the Dominican Republic: a developing country. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:14138-14149. [PMID: 32040738 DOI: 10.1007/s11356-020-07927-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 01/28/2020] [Indexed: 05/08/2023]
Abstract
Anaerobic digestion of water hyacinth (Pontederia crassipes Mart.) from eutrophic water bodies could be a sustainable post weed management practice to generate bioenergy. Comparative analyses of the water quality, physicochemical characteristics, and biomethanation kinetics of water hyacinth from two sites with different water types (brackish versus freshwater) in the Ozama river, Dominican Republic, were conducted. Also, the energy produced from the anaerobic digestion and that consumed in harvesting was estimated. The highest non-structural components in the form of protein (18.8 ± 1.9%) and extractives (26.4 ± 0.1%) were found in brackish water hyacinth, whereas that from freshwater had the highest amount of holocellulose (41.2 ± 2.8%). Indicators of plant productivity, i.e., chlorophyll b and bulk density, were more than 30% higher in brackish than in freshwater hyacinth. The methane production rate in the digestion of water hyacinth from brackish water (22.5 N. L/kg VS added· day) was twice that from freshwater (10.0 N. L/kg VSadded· day). The higher nutrient content in the brackish water could have influenced the superior performance of water hyacinth from that source compared with that from freshwater. Overall, the maximum methane potential of the Ozama river water hyacinth was 399.2 ± 32.2 N. L CH4/kg VSadded. The estimated energy produced per ton of fresh biomass was 846.5 MJ, but only 57.9 MJ would be required for mechanical harvesting. The biomethanation of water hyacinth can mitigate weed management costs in developing countries.
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Affiliation(s)
- Yessica A Castro
- Department of Biological Engineering, College of Engineering, Utah State University, 4105 Old Main Hill, Logan, UT, 84322-4105, USA.
- Instituto Especializado de Estudios Superiores Loyola, San Cristóbal, Dominican Republic.
| | - Foster A Agblevor
- Department of Biological Engineering, College of Engineering, Utah State University, 4105 Old Main Hill, Logan, UT, 84322-4105, USA
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