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Yan Y, Tong K, Li C, Pan L. The methods for improving the biodegradability of oily sludge: a critical review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:41844-41853. [PMID: 38866932 DOI: 10.1007/s11356-024-33950-2] [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: 03/18/2024] [Accepted: 06/05/2024] [Indexed: 06/14/2024]
Abstract
Biological degradation method, as an environmentally friendly, low-carbon, and clean pollution treatment technology, is widely used for the harmless disposal of oily sludge. The biodegradability of oily sludge with stable emulsification system, high oil, and water content is poor. Therefore, it is necessary to pre-treat the oily sludge to improve its biodegradability, including recover the petroleum resources and remove heavy metals and bio-toxic organic matters. This review systematically summarizes five oily sludge treatment methods and their influences on sludge biodegradability, including pyrolysis, chemical hot washing, solvent extraction, chemical oxidation, and hydrothermal. Pyrolysis at temperatures above 750 °C produces high molecular weight polycyclic aromatic hydrocarbons, chemical hot washing and chemical oxidation would cause secondary pollution, solvent extraction method could not be applied due to the high cost and high toxicity of the extractant, and the oil removal of hydrothermal method is inefficient. Additionally, the principles, advantages, and disadvantages of those treatments and the factors affecting microbial degradation were analyzed, which provide the development direction of pretreatment technology to improve the biodegradability of oily sludge.
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Affiliation(s)
- Yuhao Yan
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China
- CNPC Research Institute of Safety and Environmental Technology, Beijing, 102206, China
- College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, China
| | - Kun Tong
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China.
- CNPC Research Institute of Safety and Environmental Technology, Beijing, 102206, China.
| | - Chengtao Li
- College of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, China
| | - Lifang Pan
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China
- CNPC Research Institute of Safety and Environmental Technology, Beijing, 102206, China
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Wang Y, Yang T, Ding L, Wei R, Qian L, Long H, Xu CC. Subcritical hydrothermal oxidation of semi-dry ash from iron ore sintering flue gas desulfurization: Experimental and kinetic studies. WASTE MANAGEMENT (NEW YORK, N.Y.) 2023; 160:156-164. [PMID: 36827884 DOI: 10.1016/j.wasman.2023.02.002] [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: 10/11/2022] [Revised: 01/07/2023] [Accepted: 02/04/2023] [Indexed: 06/18/2023]
Abstract
Realization of low temperature and high efficiency oxidation of CaSO3 is the key to solve the issue of ecological hazards caused by semi-dry sintering flue gas desulfurization ash. The subcritical hydrothermal technology was employed for the oxidation of CaSO3, achieving 89.83% of CaSO3 at 180 °C, 2 MPa for 120 min with a solid-to-liquid ratio of 1:20. The macroscopic oxidation kinetics of CaSO3 in the subcritical hydrothermal reaction system was investigated. A mathematical model was established, incorporating the intrinsic reaction, CaSO3 dissolution, oxygen diffusion and CaSO4 precipitation. It was concluded that the macroscopic oxidation of CaSO3 was co-controlled by the oxygen diffusion and CaSO4 precipitation. Subcritical hydrothermal technology promises not only higher efficiency, but more importantly, potentially "one-step" preparation of CaSO4 whiskers, enabling cost-effective and high value-added resource utilization of the semi-dry FGD ash.
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Affiliation(s)
- Yifan Wang
- School of Metallurgical Engineering, Anhui University of Technology, Maxiang road, Ma'anshan, Anhui province 243032, China; Department of Chemical/Biochemical Engineering, Institute for Chemicals and Fuels from Alternative Resources (ICFAR), Western University, 1151 Richmond St, London, Ontario N6A 5B9, Canada
| | - Tao Yang
- School of Metallurgical Engineering, Anhui University of Technology, Maxiang road, Ma'anshan, Anhui province 243032, China
| | - Long Ding
- School of Metallurgical Engineering, Anhui University of Technology, Maxiang road, Ma'anshan, Anhui province 243032, China
| | - Rufei Wei
- School of Metallurgical Engineering, Anhui University of Technology, Maxiang road, Ma'anshan, Anhui province 243032, China
| | - Lixin Qian
- School of Metallurgical Engineering, Anhui University of Technology, Maxiang road, Ma'anshan, Anhui province 243032, China
| | - Hongming Long
- School of Metallurgical Engineering, Anhui University of Technology, Maxiang road, Ma'anshan, Anhui province 243032, China; Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education, No. 59 Hudong road, Ma'anshan, Anhui province 243002, China.
| | - Chunbao Charles Xu
- Department of Chemical/Biochemical Engineering, Institute for Chemicals and Fuels from Alternative Resources (ICFAR), Western University, 1151 Richmond St, London, Ontario N6A 5B9, Canada.
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Kakar FL, Liss SN, Elbeshbishy E. Impact of solid content on hydrothermal pretreatment of municipal sludge prior to fermentation and anaerobic digestion. CHEMOSPHERE 2022; 308:136363. [PMID: 36087725 DOI: 10.1016/j.chemosphere.2022.136363] [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: 02/01/2022] [Revised: 08/26/2022] [Accepted: 09/04/2022] [Indexed: 06/15/2023]
Abstract
This study investigated the impact of the solid sludge content concentrations (SC) on hydrothermal pretreatment (HTP) before fermentation and anaerobic digestion. Five different SC of 3.5%, 7%, 10%, 12%, and 16% were investigated in two different scenarios. The first scenario entailed using only the pretreated samples as substrates, whereas in scenario two, the substrates included pretreated samples combined with the supernatant. Results revealed that the highest overall pCOD solubilization (considering HTP and fermentation) of 64% was achieved for the sample with 12% SC combined with supernatant. The maximum volatile fatty acids production of 2.8 g COD/L occurred with 10% SC without supernatant. The maximum methane yield of 291 mL CH4/g VSS added was attained at 7% SC without supernatant. Furthermore, the results indicated that increasing the SC beyond 7% in scenario 1 and 10% in scenario two led to a decrease in methane yield. Additionally, optimizing for all desired endpoints may be difficult, and there are limits on the increase in SC concerning methane production.
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Affiliation(s)
- Farokh Laqa Kakar
- Environmental Research Group for Resource Recovery, Department of Civil Engineering, Faculty of Engineering, Architecture and Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada
| | - Steven N Liss
- Department of Chemistry and Biology, Faculty of Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada; School of Environmental Studies, Queen's University, Kingston, ON, K7L 3N6, Canada; Department of Microbiology, Stellenbosch University, Private Bag, XI, Matieland, 7602, Stellenbosch, South Africa
| | - Elsayed Elbeshbishy
- Environmental Research Group for Resource Recovery, Department of Civil Engineering, Faculty of Engineering, Architecture and Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada.
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Dan W, Xu F, Fanhai Z, Su H. Toxic effect of fracturing flow-back fluid on Vibrio fischeri, Daphnia, and specific industry microorganisms Aspergillus niger and S. cerevisiae. ENVIRONMENTAL MONITORING AND ASSESSMENT 2022; 194:728. [PMID: 36064812 DOI: 10.1007/s10661-022-10308-0] [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: 11/27/2021] [Accepted: 07/12/2022] [Indexed: 06/15/2023]
Abstract
Previous studies have shown that the soil microbial population and soil enzyme activity are seriously affected by fracturing flow-back fluid (FFBF) from the shale gas mining process. However, the toxic effect of FFBF on specific bacteria, fungi, and plankton has not been systematically confirmed in detail. In this paper, a toxic effect evaluation of FFBF was conducted using the representative toxicity test organisms Vibrio fischeri, Daphnia, Aspergillus niger, and S. cerevisiae, indicating that FFBF can significantly decrease the survival rate of these species. The results also showed that there was a significant negative correlation between the concentration of some inorganic toxicity factors and the survival rate when Daphnia was used as the test organism, indicating that the toxicity degree order for these inorganic toxicity factors is Ba2+ > Li+ > As3+ > Cl- > Cu2+ > Rb2+ > Ga2+ > V2+ > Na+. In addition, other toxic factors, including polycyclic aromatic hydrocarbons (PAHs), were also determined, and the order of toxic effects with a negative correlation to the Daphnia survival rate was confirmed. These results showed that the biological toxicity of FFBF was caused not only by inorganic toxicity factors such as heavy metals but also by organic compounds such as PAHs. The results not only provide a significant reference value for the systematic assessment of biological toxicity by FFBF, but they also have great significance for developing approaches to appropriate FFBF treatment.
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Affiliation(s)
- Wang Dan
- Chongqing Environmental Protection Engineering Technology Center for Shale Gas Development, Fuling, 408000, People's Republic of China
| | - FengLin Xu
- Chongqing Environmental Protection Engineering Technology Center for Shale Gas Development, Fuling, 408000, People's Republic of China
| | - Zeng Fanhai
- Chongqing Environmental Protection Engineering Technology Center for Shale Gas Development, Fuling, 408000, People's Republic of China
| | - HaiFeng Su
- Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Science, Fangzheng Avenue, Shuitu High-tech Park, Beibei, Chongqing, 266400714, China.
- Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Natural and Resources, ShanXi province, XiAn, 710075, People's Republic of China.
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Mei X, Zeng F, Xu F, Su H. Toxic effects of shale gas fracturing flowback fluid on microbial communities in polluted soil. ENVIRONMENTAL MONITORING AND ASSESSMENT 2021; 193:786. [PMID: 34755223 DOI: 10.1007/s10661-021-09544-7] [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: 06/23/2021] [Accepted: 10/19/2021] [Indexed: 06/13/2023]
Abstract
A large amount of shale gas fracturing flowback fluid (FFBF) from the process of shale gas exploitation causes obvious ecological harm to health of soil and water. However, biological hazard of soil microbial populations by fracturing flowback fluid remains rarely reported. In this study, the microbiological compositions were assessed via analyzing diversity of microbial populations. The results showed significant differences between polluted soil by fracturing flowback fluid and unpolluted soil in different pH and temperature conditions. And then, the microbe-index of biological integrity (M-IBI) was used to evaluate the toxicity of the fracturing flowback fluid based on analysis of microbial integrity. The results showed that polluted soil lacks key microbial species known to be beneficial to soil health, including denitrifying bacteria and cellulose-decomposing bacteria, and 35 °C is a critical value for estimating poor and sub-healthy level of damage to microbial integrity by fracturing flowback fluid. Our results provide a valuable reference for the evaluation of soil damage by fracturing flowback fluid.
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Affiliation(s)
- Xudong Mei
- Chongqing Environmental Protection Engineering Technology Center for Shale Gas Development, Fuling, 408000, People's Republic of China
| | - Fanhai Zeng
- Chongqing Environmental Protection Engineering Technology Center for Shale Gas Development, Fuling, 408000, People's Republic of China
| | - FengLin Xu
- Chongqing Environmental Protection Engineering Technology Center for Shale Gas Development, Fuling, 408000, People's Republic of China
| | - HaiFeng Su
- Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Science, 266 Fangzheng Avenue, Shuitu High-tech Park, Beibei, Chongqing, 400714, People's Republic of China.
- Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Natural and Resources, XiAn, ShanXi province, 710075, People's Republic of China.
- Zhejiang A&F University, No.666 Wusu Street, Lin'an District, Hangzhou, Zhejiang, 311300, People's Republic of China.
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Dang Z, Zhu X, Wang L, Ji G. Titanium dioxide catalytic hydrothermal liquefaction to treat oily sludge: As hydrogen production catalyst. CHEMICAL ENGINEERING JOURNAL ADVANCES 2021. [DOI: 10.1016/j.ceja.2021.100139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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