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Wu X, Nawaz S, Li Y, Zhang H. Environmental health hazards of untreated livestock wastewater: potential risks and future perspectives. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:24745-24767. [PMID: 38499926 DOI: 10.1007/s11356-024-32853-6] [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: 10/13/2023] [Accepted: 03/07/2024] [Indexed: 03/20/2024]
Abstract
Due to technological and economic limitations, waste products such as sewage and manure generated in livestock farming lack comprehensive scientific and centralized treatment. This leads to the exposure of various contaminants in livestock wastewater, posing potential risks to both the ecological environment and human health. This review evaluates the environmental and physical health risks posed by common pollutants in livestock wastewater and outlines future treatment methods to mitigate these risks. Residual wastes in livestock wastewater, including pathogenic bacteria and parasites surviving after epidemics or diseases on various farms, along with antibiotics, organic wastes, and heavy metals from farming activities, contribute to environmental damage and pose risks to human health. As the livestock industry's development increasingly impacts society's future negatively, addressing the issue of residual wastes in livestock wastewater discharge becomes imperative. Ongoing advancements in wastewater treatment systems are consistently updating and refining practices to effectively minimize waste exposure at the discharge source, mitigating risks to environmental ecology and human health. This review not only summarizes the "potential risks of livestock wastewater" but also explores "the prospects for the development of wastewater treatment technologies" based on current reports. It offers valuable insights to support the long-term and healthy development of the livestock industry and contribute to the sustainable development of the ecological environment.
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Affiliation(s)
- Xiaomei Wu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China
| | - Shah Nawaz
- Department of Anatomy, Faculty of Veterinary Science, University of Agriculture, Faisalabad, Pakistan
| | - Ying Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China
| | - Hui Zhang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China.
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Zhou Y, Russel M, Guo W, Zheng Z, Hu C, Li C, Li H. A green approach to copper biodetoxification and sustainable agriculture application by vermicomposting in pig manure. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 873:162329. [PMID: 36805068 DOI: 10.1016/j.scitotenv.2023.162329] [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: 01/30/2023] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
A green approach of copper (Cu) contaminated pig manure composting by earthworm Eisenia fetida was optimized. This work aims to assess the relationship between the bio-fertility properties and bioaccumulation of Cu during vermicomposting with five different doses of Cu. The optimal concentration of copper largely promoted the enrichment of nitrogen, phosphorus, and potassium, but the biological activities of earthworms could be inhibited once the Cu concentration exceed the threshold. When the Cu doses at 300 mg kg-1, the nutrient recovery rate (Irecovery) of available nitrogen, phosphorus and potassium reached their highest value, concomitant with largest C/N ratio reduced at 46.01 %. Moreover, nutrients recovery mechanism of total phosphorus increased up to 0.11 % h-1 and higher bioaccumulations in faces and intestine were detected by 1.79 and 0.99, respectively, during vermicomposting. The maximal enzyme activity rates (kmax) indicate that the enzyme activities, such as ROS and SOD, are sensitive bioindicators, which can be used to estimate the stress response of earthworms and Cu biotoxicity. The maximum specific growth rate (μmax) of the actinomycetes (TAct) increased gradually from 0.02 to 0.04 with the increase of Cu doses, but total fungi (TF) showed different response to μmax, which decreased firstly and then increased. It was demonstrated that Cu influenced the gut microbial community to vary the bio-fertility properties and bioaccumulation of Cu in the pig manure. All the findings refer that the vermicomposting could be the sustainable agricultural practices.
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Affiliation(s)
- Yong Zhou
- Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables, College of Life Sciences and Technology, Hubei Engineering University, Xiaogan 432000, PR China.
| | - Mohammad Russel
- School of Ocean Science and Technology, Department of Environmental Ecological Engineering, Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Dalian University of Technology, Liaoning, Panjin 124221, PR China
| | - Wenwei Guo
- College of Culture and Tourism, Zhangzhou Institute of Technology, Zhangzhou 363000, PR China
| | - Zuhong Zheng
- Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables, College of Life Sciences and Technology, Hubei Engineering University, Xiaogan 432000, PR China
| | - Chao Hu
- Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables, College of Life Sciences and Technology, Hubei Engineering University, Xiaogan 432000, PR China
| | - Changchun Li
- Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables, College of Life Sciences and Technology, Hubei Engineering University, Xiaogan 432000, PR China
| | - Huankai Li
- College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
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Shurson GC, Urriola PE, Hung YT. Too Much of a Good Thing: Rethinking Feed Formulation and Feeding Practices for Zinc in Swine Diets to Achieve One Health and Environmental Sustainability. Animals (Basel) 2022; 12:3374. [PMID: 36496895 PMCID: PMC9739216 DOI: 10.3390/ani12233374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 11/26/2022] [Accepted: 11/30/2022] [Indexed: 12/03/2022] Open
Abstract
The objectives of this review were to summarize current knowledge of Zn in swine nutrition, environmental concerns, potential contribution to antimicrobial resistance, and explore the use of alternative feeding strategies to reduce Zn excretion in manure while capturing improvements in productivity. Zinc is a required nutrient for pigs but is commonly supplemented at concentrations that greatly exceed estimated requirements. Feeding pharmacological concentrations of Zn from ZnO to pigs for 1 to 2 weeks post-weaning reduces post-weaning diarrhea and improves growth performance. Feeding elevated dietary levels of Zn to sows during the last 30 days of gestation can reduce the incidence of low-birth-weight pigs and pre-weaning mortality. Most of the dietary Zn consumed by pigs is not retained in the body and is subsequently excreted in manure, which led several countries to impose regulations restricting dietary Zn concentrations to reduce environmental impacts. Although restricting Zn supplementation in swine diets is a reasonable approach for reducing environmental pollution, it does not allow capturing health and productivity benefits from strategic use of elevated dietary Zn concentrations. Therefore, we propose feeding strategies that allow strategic use of high dietary concentrations of Zn while also reducing Zn excretion in manure compared with current feeding practices.
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Affiliation(s)
- Gerald C. Shurson
- Department of Animal Science, University of Minnesota, St. Paul, MN 55108, USA
| | - Pedro E. Urriola
- Department of Animal Science, University of Minnesota, St. Paul, MN 55108, USA
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Ezzariai A, Hafidi M, Ben Bakrim W, Kibret M, Karouach F, Sobeh M, Kouisni L. Identifying Advanced Biotechnologies to Generate Biofertilizers and Biofuels From the World's Worst Aquatic Weed. Front Bioeng Biotechnol 2022; 9:769366. [PMID: 35004639 PMCID: PMC8727915 DOI: 10.3389/fbioe.2021.769366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 11/25/2021] [Indexed: 11/13/2022] Open
Abstract
Water hyacinth (Eichhornia crassipes L.) was introduced as an invasive plant in freshwater bodies more particularly in Asia and Africa. This invasive plant grows rapidly and then occupies a huge layer of freshwater bodies. Hence, challenges are facing many countries for implementing suitable approaches for the valorization of the world's worst aquatic weed, and water hyacinth (WH). A critical and up-to-date review article has been conducted for more than 1 year, based on more than 100 scientific journal articles, case studies, and other scientific reports. Worldwide distribution of WH and the associated social, economic, and environmental impacts were described. In addition, an extensive evaluation of the most widely used and innovative valorization biotechnologies, leading to the production of biofertilizer and bioenergy from WH, and was dressed. Furthermore, an integrated search was used in order to examine the related advantages and drawbacks of each bioprocess, and future perspectives stated. Aerobic and anaerobic processes have their specific basic parameters, ensuring their standard performances. Composting was mostly used even at a large scale, for producing biofertilizers from WH. Nevertheless, this review explored some critical points to better optimize the conditions (presence of pollutants, inoculation, and duration) of composting. WH has a high potential for biofuel production, especially by implementing several pretreatment approaches. This review highlighted the combined pretreatment (physical-chemical-biological) as a promising approach to increase biofuel production. WH valorization must be in large quantities to tackle its fast proliferation and to ensure the generation of bio-based products with significant revenue. So, a road map for future researches and applications based on an advanced statistical study was conducted. Several recommendations were explored in terms of the choice of co-substrates, initial basic parameters, and pretreatment conditions and all crucial conditions for the production of biofuels from WH. These recommendations will be of a great interest to generate biofertilizers and bioenergy from WH, especially within the framework of a circular economy.
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Affiliation(s)
- Amine Ezzariai
- African Sustainable Agriculture Research Institute, Mohammed VI Polytechnic University, Laayoune, Morocco
| | - Mohamed Hafidi
- Laboratoire Biotechnologies Microbiennes, Agrosciences et Environnement (BioMagE), Unité de Recherche Labellisée, Faculty of Science Semlalia, Cadi Ayyad University, Marrakech, Morocco.,Agrobiosciences Department, Mohammed VI Polytechnic University, Benguérir, Morocco
| | - Widad Ben Bakrim
- African Sustainable Agriculture Research Institute, Mohammed VI Polytechnic University, Laayoune, Morocco.,Agrobiosciences Department, Mohammed VI Polytechnic University, Benguérir, Morocco
| | - Mulugeta Kibret
- African Sustainable Agriculture Research Institute, Mohammed VI Polytechnic University, Laayoune, Morocco.,Department of Biology, Bahir Dar University, Bahir Dar, Ethiopia
| | - Fadoua Karouach
- African Sustainable Agriculture Research Institute, Mohammed VI Polytechnic University, Laayoune, Morocco
| | - Mansour Sobeh
- Agrobiosciences Department, Mohammed VI Polytechnic University, Benguérir, Morocco
| | - Lamfeddal Kouisni
- African Sustainable Agriculture Research Institute, Mohammed VI Polytechnic University, Laayoune, Morocco
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Harun I, Pushiri H, Amirul-Aiman AJ, Zulkeflee Z. Invasive Water Hyacinth: Ecology, Impacts and Prospects for the Rural Economy. PLANTS (BASEL, SWITZERLAND) 2021; 10:plants10081613. [PMID: 34451658 PMCID: PMC8401593 DOI: 10.3390/plants10081613] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 07/04/2021] [Accepted: 07/04/2021] [Indexed: 06/01/2023]
Abstract
Water hyacinth (WH) is notorious for causing severe environmental degradation and being an economic burden to manage. However, it offers substantial prospects if exploited, especially by rural communities. High temperatures, eutrophic conditions and other environmental factors promote the proliferation of the plant in regions where it has been introduced. Regarded as among the world's worst invasive weeds, WH is nearly impossible to control and eradicate without an integrated approach and community participation. The effectiveness of control methods varies, yet sustained community involvement determines the long-term success of these methods. Reproducing rapidly, WH has the resource capacity to support a unique microeconomic ecosystem, incentivising WH control by generating sustainable income. The WH ecology, the socioeconomic impacts of its invasion and its various applications are reviewed, and revenue generation and cost-saving options are highlighted. A circular microeconomic model is proposed by integrating WH valorisation into the general limitations of a rural community. Empowering locals with opportunities and enticing them with potential economic gains can be a nudge towards a pro-environment behavioural change in managing WH. This would aid in upgrading local livelihoods and could foster resilience within the community in tackling both environmental problems and economic setbacks through the management of WH invasions.
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Ding H, Zhang Q, Xu H, Yu X, Chen L, Wang Z, Feng J. Selection of copper and zinc dosages in pig diets based on the mutual benefit of animal growth and environmental protection. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 216:112177. [PMID: 33839484 DOI: 10.1016/j.ecoenv.2021.112177] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 03/17/2021] [Accepted: 03/19/2021] [Indexed: 06/12/2023]
Abstract
Dietary copper and zinc additives facilitate the growth and development of animals, but heavy metal in feces threatens the ecological environment, and balance is the key to solving the problem. In this study, a trial of 2000 pigs (early nursery, 9-15 kg; late nursery, 15-25 kg; grower: 25-60 kg) was conducted to analyze the effects of different diets (gradient dosage of copper and zinc additives) on growth performance, antioxidant performance, immune function, and fecal heavy metal excretion of piglets and growing pigs. Although no significant differences were observed in average daily gain (ADG) and average daily feed intake (ADFI) between treatments during the entire nursery-grower period, the addition of appropriate high doses of copper and zinc to the diet had a beneficial effect on the antioxidant status and immune function of weaned piglets. Especially at early nursery, compared with the low-copper group (5 mg/kg Cu), the high-copper group (120 mg/kg Cu) could significantly increase the peroxidase (POD), glutathione peroxidase (GSH-PX), total antioxidant capacity (T-AOC), catalase (CAT) and copper/zinc superoxide dismutase (Cu/Zn-SOD), cortisol in the serum. Moreover, the addition of zinc and copper in the diet not only increased the concentration of corresponding trace elements in the serum, but also affected the concentration of other trace elements in the serum. The reduction of copper and zinc content in the diet contributed to reducing the copper and zinc content in feces. In conclusion, we have formulated the mutual benefit dosages of copper and zinc (9-15 kg: 5 mg/kg Cu and 50 mg/kg Zn; 15-25 kg: 4 mg/kg Cu and 50 mg/kg Zn; 25-60 kg: 4 mg/kg Cu and 10 mg/kg Zn) for weaning piglets and growing pigs, which would help ensure the healthy growth of animals and reduce environmental heavy metal residues. CAPSULE: This study developed a mutually beneficial dose of copper and zinc in pig diets, which promotes animal growth and protects the environment.
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Affiliation(s)
- Haoxuan Ding
- College of Animal Sciences, Zhejiang University, Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, China
| | - Qian Zhang
- College of Animal Sciences, Zhejiang University, Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, China
| | - Huangen Xu
- Research Center of Zhejiang Kesheng Feed Co., Ltd., Shaoxing, Zhejiang, China
| | - Xiaonan Yu
- College of Animal Sciences, Zhejiang University, Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, China
| | - Lingjun Chen
- College of Animal Sciences, Zhejiang University, Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, China
| | - Zhonghang Wang
- College of Animal Sciences, Zhejiang University, Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, China
| | - Jie Feng
- College of Animal Sciences, Zhejiang University, Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Hangzhou, China.
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Wang Y, Chen Z, Wen Q, Ji Y. Variation of heavy metal speciation, antibiotic degradation, and potential horizontal gene transfer during pig manure composting under different chlortetracycline concentration. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:1224-1234. [PMID: 32839909 DOI: 10.1007/s11356-020-10557-x] [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: 03/11/2020] [Accepted: 08/17/2020] [Indexed: 06/11/2023]
Abstract
Overuse of heavy metal and antibiotics in livestock husbandry has led to the accumulation of heavy metal resistance genes (HMRGs) and antibiotic resistance genes (ARGs) in environment. This research aims to reveal the variation of heavy metal speciation and potential horizontal gene transfer (HGT) of HMRGs and ARGs in manure composting under different initial chlortetracycline (CTC) concentrations. Treatments spiked with 20 mg/kg CTC (treatment P1), 100 mg/kg CTC (treatment P2), and the control (treatment CK) were operated. Results showed that CTC could be completely removed in the thermophilic phase of all the treatments despite of the initial concentrations. Bioavailable Cu in treatments CK, P1, and P2 declined by 14.5%, 27.1%, and 26.7% and bioavailable Zn declined by 15.3%, 29.5%, and 12.1%, respectively, after the composting, respectively. Relative abundance of HMRGs decreased by 6.49 log, 8.88 log, and 5.77 log, respectively, in treatments CK, P1, and P2. Relative abundance of ARGs decreased by 3.37 log, 4.86 log, and 3.32 log, respectively, in treatments CK, P1, and P2. Composting could effectively reduce genes pcoD, pcoA, zntA, tetQ, and tetA, which might locate on the same plasmid. CTC of 100 mg/kg promoted the co-selection of ARGs and HMRGs and increased the potential HGT of gene cusA.
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Affiliation(s)
- Yao Wang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin, 150090, China
| | - Zhiqiang Chen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin, 150090, China
| | - Qinxue Wen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin, 150090, China.
- School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, People's Republic of China.
| | - Ye Ji
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (SKLUWRE, HIT), Harbin, 150090, China
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Xu Y, Li X, Cong C, Gong G, Xu Y, Che J, Hou F, Chen H, Wang L. Use of resistant Rhizoctonia cerealis strains to control wheat sharp eyespot using organically developed pig manure fertilizer. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 726:138568. [PMID: 32305767 DOI: 10.1016/j.scitotenv.2020.138568] [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: 02/20/2020] [Revised: 04/02/2020] [Accepted: 04/07/2020] [Indexed: 06/11/2023]
Abstract
The effects of Rhizoctonia cerealis resistant strains to control wheat sharp eyespot in pig manure developed organic fertilizer were investigated. Organic fertilizer was produced in a self-built aerated static composting box (0.37 m3) and later assessed using values of temperature, moisture, pH, C/N ratio, nitrogen transformation, fluvic- and humic acid composition and germination index. Together, these assessments indicated that disposed pig manure could be considered as a non-hazardous fertilizer. By adding R. cerealis resistant strains (Bacillus flexus, B. amyloliquefaciens, B. amyloliquefaciens, B. licheniformis and Paenibacillus sp.), we were successfully able to develop wheat sharp eyespot inhibiting bio-organic fertilizer. Our results showed that soil applied with 10 t/hm2 of the developed bio-organic fertilizer significantly improved the dry weight of the wheat, promoted chlorophylls and soluble protein composition and effectively prevented the wheat from sharp eyespot. The protection rate (77.1%) of our developed bio-organic fertilizer is 42.3% higher than the tested commercially available organic fertilizer (34.8%), and the disease index is significantly lower (P < 0.001) than both the control and commercial organic fertilizer. In conclusion, the prevention and control effects of our developed bio-organic fertilizer on wheat sharp eyespot were both significant and promising.
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Affiliation(s)
- Yanlong Xu
- School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China
| | - Xiaoyu Li
- School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China; Center for Food Safety of Animal Origin, Ministry of Education, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China; Xinjiang Western Animal Husbandry Co., Ltd, No. 29 Beisandonglu, Shihezi 832099, China
| | - Cong Cong
- School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China
| | - Gailin Gong
- School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China
| | - Yongping Xu
- School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China; Center for Food Safety of Animal Origin, Ministry of Education, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China
| | - Jian Che
- School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China
| | - Fuqin Hou
- Xinjiang Western Animal Husbandry Co., Ltd, No. 29 Beisandonglu, Shihezi 832099, China
| | - Hongli Chen
- Xinjiang Tianshan Military Reclamation and Animal Husbandry Co., Ltd, No. 19 Beisandonglu, Shihezi 832099, China
| | - Lili Wang
- School of Bioengineering, Dalian University of Technology, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China; Center for Food Safety of Animal Origin, Ministry of Education, No. 2 Linggong Road, Hi-Tech Zone, Dalian 116024, China; Xinjiang Western Animal Husbandry Co., Ltd, No. 29 Beisandonglu, Shihezi 832099, China.
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Yin Y, Gu J, Wang X, Tuo X, Zhang K, Zhang L, Guo A, Zhang X. Effects of copper on the composition and diversity of microbial communities in laboratory-scale swine manure composting. Can J Microbiol 2018; 64:409-419. [DOI: 10.1139/cjm-2017-0622] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study investigated the effects of adding copper at 3 treatment levels (0 (control: CK), 200 (low: L), and 2000 (high: H) mg·kg−1 treatments) on the bacterial communities during swine manure composting. The abundances of the bacteria were determined by quantitative PCR and their compositions were evaluated by high-throughput sequencing. The results showed that the abundance of bacteria was inhibited by the H treatment during days 7–35, and principal component analysis clearly separated the H treatment from the CK and L treatments. Actinobacteria, Firmicutes, and Proteobacteria were the dominant bacterial taxa, and a high copper concentration decreased the abundances of bacteria that degrade cellulose and lignin (e.g., class Bacilli and genus Truepera), especially in the mesophilic and thermophilic phases. Moreover, network analysis showed that copper might alter the co-occurrence patterns of bacterial communities by changing the properties of the networks and the keystone taxa, and increase the competition by increasing negative associations between bacteria during composting. Temperature, water-soluble carbohydrates, and copper significantly affected the variations in the bacterial community according to redundancy analysis. The copper content mainly contributed to the bacterial community in the thermophilic and cooling phases, where it had positive relationships with potentially pathogenic bacteria (e.g., Corynebacterium_1 and Acinetobacter).
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Affiliation(s)
- Yanan Yin
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Jie Gu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
- Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Xiaojuan Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
- Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Xiaxia Tuo
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Kaiyu Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Li Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Aiyun Guo
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Xin Zhang
- College of Science, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
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