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Zheng X, Zou D, Wu Q, Zhang L, Tang J, Liu F, Xiao Z. Speciation, leachability, and phytoaccessibility of heavy metals during thermochemical liquefaction of contaminated peanut straw. WASTE MANAGEMENT (NEW YORK, N.Y.) 2024; 176:20-29. [PMID: 38246074 DOI: 10.1016/j.wasman.2024.01.024] [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: 10/19/2023] [Revised: 12/14/2023] [Accepted: 01/13/2024] [Indexed: 01/23/2024]
Abstract
In this study, the speciation, leachability, phytoaccessibility, and environmental risks of heavy metals (Cd, Zn, and Cu) during liquefaction of contaminated peanut straw in ethanol at different temperatures (220, 260, 300, 340, and 380 °C) were comprehensively investigated. The results showed that elevated temperatures facilitated heavy metal accumulation in the biochar. The acid-soluble/exchangeable and reducible fraction percentages of heavy metals were substantially reduced in the biochar after liquefaction as the temperature increased, and the oxidizable fraction became the dominant heavy metal fraction, accounting for 44.14-78.67%. Furthermore, although an excessively high liquefaction temperature (380 °C) increased the residual fraction percentages of Zn and Cu, it was detrimental to Cd immobilization. The acid-soluble/exchangeable Cd in the contaminated peanut straw readily migrates to the bio-oil during liquefaction, with the highest concentration of 1.60 mg/kg at 260 °C liquefaction temperature, whereas Zn and Cu are predominantly bound to the unexchangeable fraction in the bio-oil. Liquefaction inhibited heavy metal leachability and phytoaccessibility in biochar, the lowest extraction rates of Cd, Zn, and Cu were 0.71%, 1.66% and 0.95% by diethylenetriamine pentaacetic acid, respectively. However, the leaching and extraction concentrations increased when the temperature was raised to 380 °C. Additionally, heavy metal risk was reduced from medium and high risk to no and low risk. In summary, liquefaction reduces heavy metal toxicity and the risks associated with contaminated peanut straw, and a temperature range of 300-340 °C for ethanol liquefaction can be considered optimal for stabilizing heavy metals.
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Affiliation(s)
- Xiaochen Zheng
- College of Environment and Ecology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha 410128, PR China
| | - Dongsheng Zou
- College of Environment and Ecology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha 410128, PR China
| | - Qingdan Wu
- College of Environment and Ecology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha 410128, PR China
| | - Liqing Zhang
- Moutai Institute, Renhuai, Guizhou 564507, PR China
| | - Jialong Tang
- College of Environment and Ecology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha 410128, PR China
| | - Fen Liu
- College of Environment and Ecology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha 410128, PR China; College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan 410128, PR China
| | - Zhihua Xiao
- College of Environment and Ecology, Hunan Agricultural University, Changsha, Hunan 410128, PR China; Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha 410128, PR China.
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Song H, Zhou J, He S, Ma Q, Peng L, Yin M, Lin H, Zeng Q. Efficient Removal of Heavy Metals from Contaminated Sunflower Straw by an Acid-Assisted Hydrothermal Process. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:1311. [PMID: 36674067 PMCID: PMC9858727 DOI: 10.3390/ijerph20021311] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 12/29/2022] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
The removal of heavy metals is crucial to the utilization of contaminated biomass resources. In this study, we report an efficient process of hydrothermal conversion (HTC) of sunflower straw (Helianthus annuus L.) to remove heavy metals. The effect of different HTC temperatures and concentrations of HCl additives on heavy metal removal efficiency was investigated. The results revealed that increasing the temperature or concentration of HCl promoted the transfer of heavy metals from hydrochar to liquid products during HTC. The heavy metals removed to the liquid products included up to 99% of Zn and Cd, 94% of Cu, and 87% of Pb after hydrothermal conversion with a temperature of 200 °C and HCl 2%. The species of heavy metals in hydrochars converted from unstable to stable with an increase in temperature from 160 °C to 280 °C. The stable fractions of heavy metals in the acidic condition decreased as the acid concentration increased. This aligns well with the high transfer efficiency of heavy metals from the solid phase to the liquid phase under acidic conditions. The FTIR indicated that the carboxy and hydroxy groups decreased significantly as the temperature increased and the concentration of HCl increased, which promoted the degradation of sunflower straw. A scan electron microscope showed that the deepening of the destruction of the initial microstructure promotes the transfer of heavy metals from hydrochars to liquid phase products. This acid-assisted hydrothermal process is an efficient method to treat biomass containing heavy metals.
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Affiliation(s)
- Huijuan Song
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, China
- Department of Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Jun Zhou
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, China
| | - Shilong He
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, China
| | - Qiao Ma
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, China
| | - Liang Peng
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, China
| | - Miaogen Yin
- Department of Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Hui Lin
- Department of Materials Science, Hunan Agricultural University, Changsha 410128, China
| | - Qingru Zeng
- Department of Environmental Science & Engineering, Hunan Agricultural University, Changsha 410128, China
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Cao M, Li H, Zhao X, Liu Z. Rethinking quantified methods for arsenic speciation and risk in a biowaste hydrothermal liquefaction system. CHEMOSPHERE 2022; 308:136153. [PMID: 36029856 DOI: 10.1016/j.chemosphere.2022.136153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 08/18/2022] [Accepted: 08/19/2022] [Indexed: 06/15/2023]
Abstract
Controversy exists to quantify the fate and speciation of Arsenic (As). We investigated its characteristics by As-containing algae in various pH hydrothermal liquefaction (HTL) system, specifically via two classical methods, i.e. the European Community Bureau of Reference (BCR) and Wenzel's method. Solid residue immobilized 11.23-16.55% of As, and 88.07-82.44% was in aqueous by the pH regulators (e.g., CH3COOH, HCl, and KOH). ICP-MS and XRD analysis revealed that As (V) was converted into As (III) and As (0) in the solid residue, while the As (V) was mainly converted into As (III) in the aqueous phase during HTL. When the classified forms of As in solid residue are compared, Wenzel's method was more appropriate for dividing the bio-availability forms of As, whereas BCR was better for estimating the toxic-potential forms of As. Subsequently, pH regulators raised the risk of As in solid residue associated with the increasing of unstable forms. The amide was hydrolyzed to carboxylic acid with acidic additives, which weakened the reducing environment in the HTL process. In contrast, the amide was hydrolyzed to ammonia with the alkaline additives, which enhanced the reducing environment and increased the risk of As in products. This work provided a new insight in systematically evaluating the risk and speciation of As in HTL.
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Affiliation(s)
- Maojiong Cao
- Laboratory of Environment-Enhancing Energy (E2E), College of Water Resources and Civil Engineering, China Agricultural University, Beijing, 100083, China
| | - Hugang Li
- College of Ecology, Taiyuan University of Technology, Taiyuan, 030024, PR China
| | - Xiao Zhao
- Laboratory of Environment-Enhancing Energy (E2E), College of Water Resources and Civil Engineering, China Agricultural University, Beijing, 100083, China
| | - Zhidan Liu
- Laboratory of Environment-Enhancing Energy (E2E), College of Water Resources and Civil Engineering, China Agricultural University, Beijing, 100083, China.
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Zhou M, Li Y, Sun R, Fan X, Li Y, Zhang X. Fe2(SO4)3-assisted anaerobic digestion of pig manure: the performance of biogas yield and heavy metal passivation. SN APPLIED SCIENCES 2022. [DOI: 10.1007/s42452-022-05161-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Abstract
The harmless disposal and recycling treatment technology of livestock manure has received increasing attention in recent years. In this study, Fe2(SO4)3 was added during anaerobic digestion (AD) of pig manure (PM) to investigate the effects of different doses of Fe2(SO4)3 on biogas yield and heavy metal passivation. The results showed that the highest biogas yield was observed after adding a moderate dose of Fe2(SO4)3 (3%, based on the total solids), while the elevated result was inhibited as the Fe2(SO4)3 dosage increased. The analysis of solid digestate (solid matter remaining after AD) revealed that AD effectively passivated Cu, Zn, and As, which can be further improved with the addition of Fe2(SO4)3. However, the passivated Cd performance during this process was negligible. Furthermore, seed germination index (GI) trial results indicated that Fe2(SO4)3-assisted AD reduced the toxicity of end products to plants. To summarize, AD assisted by the addition of an appropriate amount of Fe2(SO4)3 is feasible to treat PM, and the addition of Fe2(SO4)3 at 3% was the most economic and environmental-friendly. This work could provide useful methods for the control of heavy metal pollution in the soil.
Article highlights
Adding 3% dose of Fe2(SO4)3 could increase methane yield by 66.76%.
Fe2(SO4)3-assisted AD passivated HMs and reduced their bioavailability.
The 3% Fe2(SO4)3-assisted AD significantly reduced the toxicity of end products to plants.
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Speciation and transformation of nitrogen for swine manure thermochemical liquefaction. Sci Rep 2022; 12:12056. [PMID: 35835911 PMCID: PMC9283412 DOI: 10.1038/s41598-022-16101-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Accepted: 07/05/2022] [Indexed: 12/05/2022] Open
Abstract
The nitrogen conversion mechanism of swine manure by thermochemical liquefaction with ethanol as solvent was investigated at a lower temperature range (180–300 °C). The fate of nitrogen in liquid phase products, bio-oil and biochar was evaluated by XPS, GC–MS and other methods. After thermochemical liquefaction, most of the nitrogen in swine manure was transferred to biochar (63.75%). As the temperature increased to 220 °C, the biochar-N yields decreased to 43.29%, accompanied by an increase in bio-oil-N and liquid phase product-N by 7.99% and 1.26% respectively. The results indicated that increasing the temperature could facilitate solid nitrogen structure cracking into bio-oil-N. Amines and heterocyclic nitrogen from protein peptide bond cracking and Maillard reactions made up the main nitrogen compounds in bio-oil, and high temperatures favored the further cyclization and condensation of heterocyclic nitrogen (e.g., indole, quinoline). In the case of biochar, the inorganic nitrogen disappeared at 260 °C and was obviously transformed into liquid phase products. The rising temperature promoted the polymerization of pyridine nitrogen and pyrrole nitrogen, which formed more stabilized nitrogen formation (such as quaternary nitrogen). Nitrogen conversion and possible reaction schematics during swine manure thermochemical liquefaction were explored in this study.
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Chai Y, Bai M, Chen A, Peng L, Shao J, Shang C, Peng C, Zhang J, Zhou Y. Thermochemical conversion of heavy metal contaminated biomass: Fate of the metals and their impact on products. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 822:153426. [PMID: 35090917 DOI: 10.1016/j.scitotenv.2022.153426] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 01/22/2022] [Accepted: 01/22/2022] [Indexed: 06/14/2023]
Abstract
With the rapid depletion of fossil energy and increasingly severe environmental pollution, the development of biomass resources for biorefineries has become a new research focus. However, heavy metals may be released during the thermochemical treatment when the biomass materials used in biomass conversion are contaminated by heavy metals. This can cause secondary environmental pollution or transference to the target products, reducing product quality. Therefore, having a systematic understanding of the fate of heavy metals in biomass conversion is necessary for alleviating potential risks. This study presents the current status of contaminated biomass and conversion products involving thermochemical processes, the migration, transformation, and impact of heavy metals in biomass conversion was investigated, and the utilization of heavy metals in contaminated biomass was briefly outlined. This review aims to link biomass conversion to the fate of heavy metals, avoid existing risks as much as possible to produce cleaner products efficiently, and promote the sustainable development of heavy metal contaminated biomass resources.
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Affiliation(s)
- Youzheng Chai
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Ma Bai
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Anwei Chen
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.
| | - Liang Peng
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Jihai Shao
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Cui Shang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Cheng Peng
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Jiachao Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Yaoyu Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
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Zhang J, Wang Y, Wang X, Wu W, Cui X, Cheng Z, Yan B, Yang X, He Z, Chen G. Hydrothermal conversion of Cd/Zn hyperaccumulator (Sedum alfredii) for heavy metal separation and hydrochar production. JOURNAL OF HAZARDOUS MATERIALS 2022; 423:127122. [PMID: 34509743 DOI: 10.1016/j.jhazmat.2021.127122] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 08/30/2021] [Accepted: 09/01/2021] [Indexed: 06/13/2023]
Abstract
The harmless treatment of heavy metal-enriched hyperaccumulator biomass is the main barrier to the industrialization of phytoremediation. Hydrothermal conversion of Sedum alfredii using different solvents (i.e ·H2O and HCl) at 210-300 ℃ was performed to investigate the behaviors of Cd and Zn, and the characteristics and potential application of the derived hydrochars were determined. Low temperature and HCl addition favored the removal of Cd/Zn from the solid phase. The highest removal efficiencies of Cd (95.0%) and Zn (89.3%) were achieved at 210 ℃ with the presence of HCl. The yield, pH, ash content, element concentration, functional groups, and crystalline minerals of the derived hydrochar were influenced by the reaction temperature and addition of HCl. The leaching risk of Cd and Zn was significantly reduced by hydrothermal conversion. The addition of HCl facilitated the immobilization of Zn, while it enhanced the mobility of Cd. Moreover, the hydrochar derived at 210 ℃ showed increased sorption capacity towards Cu, and the addition of HCl greatly improved the energy density of hydrochar. These results suggest that HCl-mediated hydrothermal conversion could be a promising technique to achieve the separation of Cd and Zn from hyperaccumulator biomass as well as the production of value-added hydrochar.
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Affiliation(s)
- Jianwei Zhang
- School of Environmental Science and Engineering/ Tianjin Key lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, PR China
| | - Yuting Wang
- School of Environmental Science and Engineering/ Tianjin Key lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, PR China
| | - Xutong Wang
- School of Environmental Science and Engineering/ Tianjin Key lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, PR China
| | - Wenzhu Wu
- School of Environmental Science and Engineering/ Tianjin Key lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, PR China
| | - Xiaoqiang Cui
- School of Environmental Science and Engineering/ Tianjin Key lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, PR China.
| | - Zhanjun Cheng
- School of Environmental Science and Engineering/ Tianjin Key lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, PR China
| | - Beibei Yan
- School of Environmental Science and Engineering/ Tianjin Key lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, PR China
| | - Xiaoe Yang
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, PR China
| | - Zhenli He
- Soil and Water Sciences Department/Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL 34945, USA
| | - Guanyi Chen
- School of Environmental Science and Engineering/ Tianjin Key lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, PR China; School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, PR China
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