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Zhang B, Cai C, Zhou Y. Iron and nitrogen regulate carbon transformation in a methanotroph-microalgae system. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 904:166287. [PMID: 37591392 DOI: 10.1016/j.scitotenv.2023.166287] [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: 07/23/2023] [Revised: 08/11/2023] [Accepted: 08/12/2023] [Indexed: 08/19/2023]
Abstract
Nutrient supply is important for maintaining a methanotroph and microalgae (MOB-MG) system for biogas valorization. However, there is a lack of understanding regarding how key elements regulate the growth of a MOB-MG coculture. In this study, a MOB-MG coculture with high protein content (0.47 g/g biomass) was established from waste activated sludge using synthetic biogas. An increase in iron availability substantially stimulated the specific growth rate (from 0.18 to 0.62 day-1) and biogas conversion rate (from 26.81 to 106.57 mg-C L-1 day-1) of the coculture. Moreover, the protein content remained high (0.51 g/g biomass), and the total lipid content increased (from 0.09 to 0.14 g/g biomass). Nitrogen limitation apparently constrained the specific growth rate (from 0.64 to 0.28 day-1) and largely reduced the protein content (from 0.51 to 0.31 g/g biomass) of the coculture. Intriguingly, the lipid content remained unchanged after nitrogen was depleted. The eukaryotic community was consistently dominated by MG belonging to Chlorella, while the populations of MOB shifted from Methylococcus/Methylosinus to Methylocystis due to iron and nitrogen amendment. In addition, diverse non-methanotrophic heterotrophs were present in the community. Their presence neither compromised the performance of the coculture system nor affected the protein content of the biomass. However, these heterotrophs may contribute to high carbon conversion efficiency by utilizing the dissolved organic carbon released by MOB and MG. Overall, the findings highlight the vital roles of iron and nitrogen in achieving efficient conversion of biogas, fast growth of cells, and optimal biomass composition in a MOB-MG coculture system.
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Affiliation(s)
- Baorui Zhang
- Interdisciplinary Graduate Program, Nanyang Technological University, 61 Nanyang Drive, 637335, Singapore; Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Chen Cai
- Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China.
| | - Yan Zhou
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
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Bai X, Huang D, Chen Y, Shao M, Wang N, Wang Q, Xu Q. Enhanced methane oxidation efficiency by digestate biochar in landfill cover soil: Microbial shifts and carbon metabolites insights. CHEMOSPHERE 2023; 343:140279. [PMID: 37758092 DOI: 10.1016/j.chemosphere.2023.140279] [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: 06/30/2023] [Revised: 09/07/2023] [Accepted: 09/24/2023] [Indexed: 09/30/2023]
Abstract
The ability of biochar to enhance the oxidation of methane (CH4) in landfill cover soil by promoting the growth and activity of methane-oxidizing bacteria (MOB) has attracted significant attention. However, the optimal characteristics of digestate-derived biochar (DBC) for promoting the MOB community and CH4 removal performance remain unclear. This study examined how the CH4 oxidation capacity and respiratory metabolism of MOB life process are affected by the application of DBC compared with the most commonly used woody-derived biochar (WBC). The addition of both WBC and DBC enhanced CH4 oxidation, with DBC exhibiting a nearly twofold increase in cumulative CH4 oxidation mass (7.14 mg CH4 g-1) compared to WBC. The high ion-exchange capacity of DBC was found to be more favorable for the growth of Type I MOB, which have more efficient metabolic pathways for CH4 oxidation. Type I MOB which are abundant in DBC may prefer monovalent positive ions, while the charge-rich nature of DBC may also have hindered extracellular protein aggregation. The superiority of DBC in terms of CH4 oxidation thus highlights the underlying mechanisms of biochar-MOB interactions, offering potential biochar options for landfill cover soil.
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Affiliation(s)
- Xinyue Bai
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China.
| | - Dandan Huang
- School of Ecology, Sun Yat-sen University, Shenzhen, 518107, PR China
| | - Yuke Chen
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China
| | - Mingshuai Shao
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China
| | - Ning Wang
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China
| | - Qian Wang
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China
| | - Qiyong Xu
- Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, Shenzhen, 518055, PR China.
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Zhou T, Tang S, Cui J, Zhang Y, Li X, Qiao Q, Long XE. Biochar amendment reassembles microbial community in a long-term phosphorus fertilization paddy soil. Appl Microbiol Biotechnol 2023; 107:6013-6028. [PMID: 37535122 DOI: 10.1007/s00253-023-12701-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 07/06/2023] [Accepted: 07/20/2023] [Indexed: 08/04/2023]
Abstract
This study investigates the effect of biochar amendment on microbial community structure and soil nutrient status in paddy soil that has been fertilized for an extended period of time, shedding light on sustainable agricultural practices. A 90-day incubation period revealed that biochar amendment, as opposed to long-term fertilization, significantly influenced the physicochemical properties and microbial composition of the soil. The microcosm experiment conducted using six treatments analyzed soil samples from a long-term rice ecosystem. We employed microbial biomarkers (phospholipid fatty acids, PLFAs; isoprenoid and branched glycerol dialkyl glycerol tetraethers, iGDGTs and brGDGTs; DNA) to assess microbial biomass and community structure. Biochar addition led to a decrease in PLFA biomass (15-32%) and archaeal iGDGT abundance (14-43%), while enhancing bacterial brGDGT abundance by 15-77%. Intact biochar increased archaeal and bacterial diversity, though fungal diversity remained unchanged. However, acid-washed biochar did not result in a uniform microbial diversity response. The abundance of various microbial taxa was changed by biochar amendment, including Crenarchaeota, Proteobacteria, Nitrospira, Basidiomycota, Halobacterota, Chloroflexi, Planctomycetota, and Ascomycota. Soil NH4+-N was found as the primary environmental factor impacting the composition of archaea, bacteria, and fungus in this study. These findings imply that the addition of biochar has a quick influence on the structure and activity of microbial communities, with fungi possibly having a critical role in acid paddy soil. This study contributes valuable knowledge for developing sustainable agricultural practices that promote healthy soil ecosystems. KEY POINTS: • Biochar type and phosphorus fertilization demonstrated an interactive effect on the diversity of archaea, but no such effect was observed for bacteria and fungi. • Soil fungi contribute to approximately 20% of the total phospholipid fatty acid (PLFA) content. • Biochar, especially acid-washed rice straw biochar, increases glucose metabolism in bacteria and archaea and decreases saprophytic fungi.
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Affiliation(s)
- Tongtong Zhou
- School of Geographic Sciences, Nantong University, Nantong, 226019, Jiangsu, China
| | - Sijia Tang
- Suzhou Industrial Park Xingyang School, Suzhou, 215000, Jiangsu, China
| | - Jie Cui
- School of Geographic Sciences, Nantong University, Nantong, 226019, Jiangsu, China
| | - Yukai Zhang
- School of Geographic Sciences, Nantong University, Nantong, 226019, Jiangsu, China
| | - Xin Li
- School of Geographic Sciences, Nantong University, Nantong, 226019, Jiangsu, China
| | - Qicheng Qiao
- School of Environment and Biological Engineering, Nantong College of Science and Technology, Nantong City, Jiangsu, 226007, People's Republic of China
- Jiangsu Province Engineering Research Center of Agricultural and Rural Pollution Prevention Technology and Equipment, Nantong City, Jiangsu, 226007, People's Republic of China
| | - Xi-En Long
- School of Geographic Sciences, Nantong University, Nantong, 226019, Jiangsu, China.
- Jiangsu Province Engineering Research Center of Agricultural and Rural Pollution Prevention Technology and Equipment, Nantong City, Jiangsu, 226007, People's Republic of China.
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Bagheri Novair S, Cheraghi M, Faramarzi F, Asgari Lajayer B, Senapathi V, Astatkie T, Price GW. Reviewing the role of biochar in paddy soils: An agricultural and environmental perspective. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 263:115228. [PMID: 37423198 DOI: 10.1016/j.ecoenv.2023.115228] [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: 04/14/2023] [Revised: 06/19/2023] [Accepted: 07/01/2023] [Indexed: 07/11/2023]
Abstract
The main challenge of the twenty-first century is to find a balance between environmental sustainability and crop productivity in a world with a rapidly growing population. Soil health is the backbone of a resilient environment and stable food production systems. In recent years, the use of biochar to bind nutrients, sorption of pollutants, and increase crop productivity has gained popularity. This article reviews key recent studies on the environmental impacts of biochar and the benefits of its unique physicochemical features in paddy soils. This review provides critical information on the role of biochar properties on environmental pollutants, carbon and nitrogen cycling, plant growth regulation, and microbial activities. Biochar improves the soil properties of paddy soils through increasing microbial activities and nutrient availability, accelerating carbon and nitrogen cycle, and reducing the availability of heavy metals and micropollutants. For example, a study showed that the application of a maximum of 40 t ha-1 of biochar from rice husks prior to cultivation (at high temperature and slow pyrolysis) increases nutrient utilization and rice grain yield by 40%. Biochar can be used to minimize the use of chemical fertilizers to ensure sustainable food production.
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Affiliation(s)
- Sepideh Bagheri Novair
- Department of Soil Science, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
| | - Meysam Cheraghi
- Department of Soil Science, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
| | - Farzaneh Faramarzi
- Department of Agronomy and Plant Breeding, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
| | | | | | - Tess Astatkie
- Faculty of Agriculture, Dalhousie University, Truro, NS B2N 5E3, Canada.
| | - G W Price
- Faculty of Agriculture, Dalhousie University, Truro, NS B2N 5E3, Canada.
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Xu Q, Yang G, Liu X, Wong JWC, Zhao J. Hydrochar mediated anaerobic digestion of bio-wastes: Advances, mechanisms and perspectives. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 884:163829. [PMID: 37121315 DOI: 10.1016/j.scitotenv.2023.163829] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 04/24/2023] [Accepted: 04/25/2023] [Indexed: 05/05/2023]
Abstract
Bio-wastes treatment and disposal has become a challenge because of their increasing output. Given the abundant organic matter in bio-wastes, its related resource treatment methods have received more and more attention. As a promising strategy, anaerobic digestion (AD) has been widely used in the treatment of bio-wastes, during which not only methane as energy can be recovered but also their reduction can be achieved. However, AD process is generally disturbed by some internal factors (e.g., low hydrolysis efficiency and accumulated ammonia) and external factors (e.g., input pollutants), resulting in unstable AD operation performance. Recently, hydrochar was wildly found to improve AD performance when added to AD systems. This review comprehensively summarizes the research progress on the performance of hydrochar-mediated AD, such as increased methane yield, improved operation efficiency and digestate dewatering, and reduced heavy metals in digestate. Subsequently, the underlying mechanisms of hydrochar promoting AD were systematically elucidated and discussed, including regulation of electron transfer (ET) mode, microbial community structure, bio-processes involved in AD, and reaction conditions. Moreover, the effects of properties of hydrochar (e.g., feedstock, hydrothermal carbonization (HTC) temperature, HTC time, modification and dosage) on the improvement of AD performance are systematically concluded. Finally, the relevant knowledge gaps and opportunities to be studied are presented to improve the progress and application of the hydrochar-mediated AD technology. This review aims to offer some references and directions for the hydrochar-mediated AD technology in improving bio-wastes resource recovery.
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Affiliation(s)
- Qiuxiang Xu
- Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, China; College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315100, PR China
| | - Guojing Yang
- College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315100, PR China
| | - Xuran Liu
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Jonathan W C Wong
- Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Jun Zhao
- Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China.
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