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Yang J, Zhang T, Ma S, Shang J, Li L, Ning Y, Zhao X. Enhancing microplastic removal and nitrogen mitigation in constructed wetlands: An earthworm-centric perspective. JOURNAL OF HAZARDOUS MATERIALS 2025; 489:137540. [PMID: 39938366 DOI: 10.1016/j.jhazmat.2025.137540] [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: 11/21/2024] [Revised: 02/01/2025] [Accepted: 02/07/2025] [Indexed: 02/14/2025]
Abstract
The presence of microplastics (MPs) in wastewater poses significant threats to ecosystems. Although constructed wetlands (CWs) demonstrate effective removal of microplastics, their efficiency is often limited by various environmental variables and system equilibrium factors. This study introduces Eisenia fetida to enhance the ecological performance of constructed wetlands and improves their removal efficiency. The findings revealed that the addition of earthworms significantly increased the removal efficiencies of polylactic acid (PLA) microplastics, chemical oxygen demand, total nitrogen, and ammonium nitrogen, with respective improvements of 13.5 %, 8.4 %, 9.7 %, and 10.5 %, respectively. Notably, the ingestion of polylactic acid microplastics by earthworms led to a substantial increase in the abundance of microorganisms, such as Actinobacteria, that were associated with microplastic degradation. Furthermore, microbial communities involved in nitrogen cycling were notably enriched, with a 12.4 % increase in nitrogen-fixing microbes and a 4.3 % increase in nitrifying microbes. These findings suggested that earthworms, through the restructuring of their gut microbial communities, not only facilitated efficient polylactic acid degradation but also enhanced nitrogen cycling processes. This provides a novel ecological mechanism for improving pollutant management and nutrient recycling in constructed wetlands.
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Affiliation(s)
- Jinyi Yang
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Tuoshi Zhang
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Shengjun Ma
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Jiacheng Shang
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Lixin Li
- School of Environment and Chemical Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China
| | - Yucui Ning
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China.
| | - Xinyue Zhao
- College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China.
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Guo BX, Shi WY, Ai JY, Zhang KJ, Wang QG, Wang WH, Li JF. Synchronous and efficient removal of carbon, nitrogen, and phosphorus from actual rural sewage by composite wetlands enhanced with functional fillers. BIORESOURCE TECHNOLOGY 2024; 414:131566. [PMID: 39366510 DOI: 10.1016/j.biortech.2024.131566] [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: 08/20/2024] [Revised: 09/22/2024] [Accepted: 10/01/2024] [Indexed: 10/06/2024]
Abstract
A composite wetland (CECW) was constructed by introducing P-adsorption filler (EPAF) and activated sludge into traditional wetlands for treating actual sewage. The results showed that EPAF improved P removal through physico-chemical adsorption, and it could be stably regenerated after adsorption saturation without potential risks. Meanwhile, zeolite promoted NH4+-N reduction in sewage by cation exchange. In addition, simultaneous biological removal of carbon, nitrogen, and phosphorus was achieved through nitrification, denitrification, anammox, and aerobic P-accumulation processes induced by Nitrobacter, Proteus Hauser, Candidatus Paracaedibacter, and Brevundimonas. Under the coupling of filler interception/adsorption, microbial assimilation/transformation, flocculation, and plant uptake, CECW obtained the removal rates of 93.22 %, 85.75 %, 91.80 %, 95.38 %, 97.07 %, and 78.05 % for turbidity, TN, NH4+-N, TP, PO43--P, and TCOD, which met the Class 1A standard (GB18918-2002). Therefore, the experiment systematically investigated the effects and mechanism of CECW in treating actual sewage, which could provide reference for rural sewage treatment and sludge utilization.
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Affiliation(s)
- Bing-Xu Guo
- College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, PR China; Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi, Xinjiang 832000, PR China
| | - Wei-Yi Shi
- College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, PR China; Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi, Xinjiang 832000, PR China
| | - Jun-Yu Ai
- College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, PR China; Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi, Xinjiang 832000, PR China
| | - Ke-Jia Zhang
- College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, PR China; Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi, Xinjiang 832000, PR China
| | - Qiu-Gang Wang
- College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, PR China; Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi, Xinjiang 832000, PR China
| | - Wen-Huai Wang
- College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, PR China; Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi, Xinjiang 832000, PR China.
| | - Jun-Feng Li
- College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, PR China; Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi, Xinjiang 832000, PR China.
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Ma S, Gu C, Yang D, Xu K, Ren H. Chemical characteristics of dissolved organic matter in effluent from sludge alkaline fermentation liquid-fed sequencing batch reactors. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 355:120444. [PMID: 38422849 DOI: 10.1016/j.jenvman.2024.120444] [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: 11/07/2023] [Revised: 02/03/2024] [Accepted: 02/20/2024] [Indexed: 03/02/2024]
Abstract
Sludge alkaline fermentation liquid (SAFL) is a promising alternative to acetate for improving biological nitrogen removal (BNR) from wastewater. SAFL inevitably contains some refractory compounds, while the characteristics of dissolved organic matter (DOM) in effluent from SAFL-fed BNR process remain unclear. In this study, the molecular weight distribution, fluorescent composition and molecular profiles of DOM in effluent from SAFL and acetate-fed sequencing batch reactors (S-SBRs and A-SBRs, respectively) at different hydraulic retention time (12 h and 24 h) was comparatively investigated. Two carbon sources resulted in similar effluent TN, but a larger amount of DOM, which was bio-refractory or microorganisms-derived, was found in effluent of S-SBRs. Compared to acetate, SAFL increased the proportion of large molecular weight organics and humic-like substances in effluent DOM by 74.87%-101.3% and 37.52%-48.35%, respectively, suggesting their bio-refractory nature. Molecular profiles analysis revealed that effluent DOM of S-SBRs exhibited a more diverse composition and a higher proportion of lignin-like molecules. Microorganisms-derived molecules were found to be the dominant fraction (71.51%-72.70%) in effluent DOM (<800 Da) of S-SBRs. Additionally, a prolonged hydraulic retention time enriched Bacteroidota, Haliangium and unclassified_f_Comamonadaceae, which benefited the degradation of DOM in S-SBRs. The results help to develop strategies on reducing effluent DOM in SAFL-fed BNR process.
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Affiliation(s)
- Sijia Ma
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
| | - Chengyu Gu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
| | - Dongli Yang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
| | - Ke Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China.
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, China
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Zhang Y, Ni JQ, Liu C, Ke Y, Zheng Y, Zhen G, Xie S. Hydrogen production promotion and energy saving in anaerobic co-fermentation of heat-treated sludge and food waste. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:14831-14844. [PMID: 38285252 DOI: 10.1007/s11356-024-31851-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 12/31/2023] [Indexed: 01/30/2024]
Abstract
The objective of this paper is to gain insights into the synergistic advantage of anaerobic co-fermentation of heat-treated sludge (HS) with food waste (FW) and heat-treated food waste (HFW) for hydrogen production. The results showed that, compared with raw sludge (RS) mixed with FW (RS-FW), the co-substrate of HS mixed with either FW (HS-FW) or HFW (HS-HFW) effectively promoted hydrogen production, with HS-HFW promoted more than HS-FW. The maximum specific hydrogen production (MSHP) and the maximum hydrogen concentration (MHC) of HS-HFW were 40.53 mL H2/g dry weight and 57.22%, respectively, and 1.21- and 1.45-fold as high as those from HS-FW. The corresponding fermentation was ethanol type for HS-HFW and butyric acid type for HS-FW. The net energy production from RS-FW and HS-FW was both negative, but it was positive (2.57 MJ) from 40% HFW addition to HS-HFW. Anaerobic fermentation was more viable for HS-HFW.
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Affiliation(s)
- Yuchen Zhang
- Institute of Environmental Science, College of Environmental and Resource Sciences and College of Carbon Neutral Modern Industry, Fujian Key Laboratory of Pollution Control and Resource Reuse, Fujian Normal University, Fuzhou, 350007, People's Republic of China
- Fujian College and University Engineering Research Center for Municipal (Solid) Waste Resourceization and Management, Fuzhou, 350007, People's Republic of China
| | - Ji-Qin Ni
- Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Changqing Liu
- School of Geographical Sciences and School of Carbon Neutrality Future Technology, Fujian Normal University, Fuzhou, 350007, People's Republic of China.
| | - Yihong Ke
- Institute of Environmental Science, College of Environmental and Resource Sciences and College of Carbon Neutral Modern Industry, Fujian Key Laboratory of Pollution Control and Resource Reuse, Fujian Normal University, Fuzhou, 350007, People's Republic of China
- Fujian College and University Engineering Research Center for Municipal (Solid) Waste Resourceization and Management, Fuzhou, 350007, People's Republic of China
| | - Yuyi Zheng
- Institute of Environmental Science, College of Environmental and Resource Sciences and College of Carbon Neutral Modern Industry, Fujian Key Laboratory of Pollution Control and Resource Reuse, Fujian Normal University, Fuzhou, 350007, People's Republic of China
- Fujian College and University Engineering Research Center for Municipal (Solid) Waste Resourceization and Management, Fuzhou, 350007, People's Republic of China
| | - Guangyin Zhen
- School of Ecological and Environmental Science, East China Normal University, Shanghai, 200241, People's Republic of China
| | - Sihuang Xie
- Institute of Environmental Science, College of Environmental and Resource Sciences and College of Carbon Neutral Modern Industry, Fujian Key Laboratory of Pollution Control and Resource Reuse, Fujian Normal University, Fuzhou, 350007, People's Republic of China
- School of Civil Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia
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