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Mu B, Zhu W, Sun J, Zhong J, Wang R, Wang X, Cao J. Enhancement of dewatering from oily sludge by addition of alcohols as cosolvents with dimethyl ether. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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Wang Q, Oshita K, Nitta T, Takaoka M. Evaluation of a sludge-treatment process comprising lipid extraction and drying using liquefied dimethyl ether. ENVIRONMENTAL TECHNOLOGY 2021; 42:3369-3378. [PMID: 32065048 DOI: 10.1080/09593330.2020.1730982] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 02/07/2020] [Indexed: 06/10/2023]
Abstract
Liquefied dimethyl ether (DME) was used to extract lipids from sewage sludge. Factorial experimental analyses were used to evaluate the influence of different variables on raw lipid extraction and sludge drying. The DME method was compared with the Bligh and Dyer (B&D) method for three undigested and two anaerobically digested dewatered sludges. The results indicate that although the raw lipid yield of the B&D method was 5% higher than that of the DME method, the proportion of fatty acid methyl esters (FAMEs) in raw lipids extracted by the DME method was 14.1-33.4%, almost twice that of the B&D method. The FAME composition varied according to sludge type, and the dewatered undigested sludges contained more unsaturated fatty acids (e.g. C18:1, C18:2). The lower heating value (LHV) of product by the DME method ranged from 3.74 to 5.70 MJ/kg compared with 1.21-0.39 MJ/kg for the B&D method. Also, DME could be reused at least five times without significantly reducing the lipid yield and drying efficiency. Finally, an economic analysis of the DME, the conventional solvent extraction, and the heat-drying methods was conducted.
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Affiliation(s)
- Quan Wang
- Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Kazuyuki Oshita
- Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Takashi Nitta
- Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Masaki Takaoka
- Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
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Mu B, Zhu W, Zhong J, Chen L, Lin N, Wang C, Chen S, Li Z. Mechanism of separation and removal of water from oily sludge using liquid dimethyl ether to dissolve hydrocarbons. CHEMOSPHERE 2021; 279:130452. [PMID: 33873064 DOI: 10.1016/j.chemosphere.2021.130452] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 03/06/2021] [Accepted: 03/27/2021] [Indexed: 06/12/2023]
Abstract
The effective disposal of oily sludge generated from the petroleum industry has received increasing concern. The primary difficulty for the reduction and resource utilization of oily sludge is dewatering. Therefore, finding an efficient and energy-saving dewatering technology is an urgent need for the treatment of oily sludge. In this study, an innovative developed method using liquefied dimethyl ether (L-DME) for dewatering is employed to deal with oily sludge for the first time. Oily sludge from a refinery was used to conduct experiments in sequencing dissolution-separation reactors. Changes in the dehydration rate, oil recovery, group components (hydrocarbon series of petroleum, including saturates, aromatics, resins and asphaltenes) at different extraction time, temperatures and L-DME additions were measured. The results revealed that L-DME removed 90% of the water and recovered 40% of the oil, which was an amazing dehydration effect for oily sludge. The water-binding form of oily sludge is different from sewage sludge and other biomass and the water in oily sludge is in a stable water-in-oil (W/O) suspension emulsified state. L-DME was mixed with semi-colloidal like oily sludge to break the structure of the water-in-oil emulsion, making the mixture into a solid-liquid two phase substances that were easy to separate, thus achieving a high degree of separation of water. The dissolution of saturated hydrocarbons, aromatic hydrocarbons, and small amounts of colloid by L-DME played an important auxiliary role in water removal.
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Affiliation(s)
- Biao Mu
- College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Wei Zhu
- College of Environment, Hohai University, Nanjing, 210098, PR China.
| | - Jun Zhong
- College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Le Chen
- College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Naixi Lin
- College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Chenyu Wang
- Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, PR China
| | - Sipeng Chen
- College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Zhuo Li
- College of Environment, Hohai University, Nanjing, 210098, PR China
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Kanda H, Ando D, Hoshino R, Yamamoto T, Wahyudiono, Suzuki S, Shinohara S, Goto M. Surfactant-Free Decellularization of Porcine Aortic Tissue by Subcritical Dimethyl Ether. ACS OMEGA 2021; 6:13417-13425. [PMID: 34056489 PMCID: PMC8158793 DOI: 10.1021/acsomega.1c01549] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 05/07/2021] [Indexed: 05/07/2024]
Abstract
Porcine aortic tissue was decellularized by subcritical dimethyl ether (DME) used as an alternative to the surfactant sodium dodecyl sulfate. The process included three steps. For the first step, lipids were extracted from the porcine aorta using subcritical DME at 23 °C with a DME pressure of 0.56 MPa. Next, DME was evaporated from the aorta under atmospheric pressure and temperature. The second step involved DNA fragmentation by DNase, which was primarily identical to the common method. For the third step, similar to the common method, DNA fragments were removed by washing with water and ethanol. After 3 days of DNase treatment, the amount of DNA remaining in the porcine aorta was 40 ng/dry-mg, which was lower than the standard value of 50 ng/mg-dry. Hematoxylin and eosin staining showed that most cell nuclei were removed from the aorta. These results demonstrate that subcritical DME eliminates the need to utilize surfactants.
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Affiliation(s)
- Hideki Kanda
- Department
of Materials Process Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Daigo Ando
- Department
of Materials Process Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Rintaro Hoshino
- Department
of Materials Process Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Tetsuya Yamamoto
- Department
of Chemical Systems Engineering, Nagoya
University, Nagoya 464-8603, Japan
| | - Wahyudiono
- Department
of Materials Process Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Shogo Suzuki
- Eco
Business Development Center, Ricoh, 1-10 Komakado, Gotemba 412-0038, Japan
| | - Satoshi Shinohara
- Eco
Business Development Center, Ricoh, 1-10 Komakado, Gotemba 412-0038, Japan
| | - Motonobu Goto
- Department
of Materials Process Engineering, Nagoya University, Nagoya 464-8603, Japan
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Qin Z, Cheng XC, Gu LB, Liu HM, Yang QL, Wang XD. Simultaneous dewatering and wax extraction of Chinese winter jujube ( Ziziphus jujuba Mill. cv. Dongzao) fruit by subcritical dimethyl ether. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2021. [DOI: 10.3136/fstr.27.711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Zhao Qin
- College of Food Science and Technology, Henan University of Technology
| | - Xi-Chuang Cheng
- College of Food Science and Technology, Henan University of Technology
| | - Ling-Biao Gu
- Henan Joint International Research Laboratory of Veterinary Biologics Research and Application, Anyang Institute of Technology
| | - Hua-Min Liu
- College of Food Science and Technology, Henan University of Technology
| | - Qiao-Li Yang
- College of Food Science and Technology, Henan University of Technology
| | - Xue-De Wang
- College of Food Science and Technology, Henan University of Technology
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Chen L, Zhu W, Lin NX, Mu B, Fan XH, Wang CY, Chen HM, Zhong J. Mechanism of separation and removal of water from dewatered sludge using L-DME to dissolve hydrophilic organic matter. CHEMOSPHERE 2020; 246:125648. [PMID: 31891851 DOI: 10.1016/j.chemosphere.2019.125648] [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: 09/04/2019] [Revised: 12/07/2019] [Accepted: 12/12/2019] [Indexed: 06/10/2023]
Abstract
Difficulties in advanced dewatering of dewatered sludge hinder sludge reduction and resource utilization. L-DME (liquified dimethyl ether) has been recently used for dewatering, but the effect of organic matter dissolution using L-DME during desorption and dehydration on water removal is not clear. In this study, dewatered sludge from urban sewage treatment plants was used to conduct experiments in sequencing dissolution-separation reactors. The changes in the dehydration rate, bound water and various organic matter levels at different times, L-DME additions, and the temperature were measured. The results show that L-DME can remove 90% of water, 100% of lipids, and 8-12% of organic matter in dewatered sludge. L-DME was mixed with the semi-like colloidal sludge, and high separation of water was achieved by mixing the L-DME with water and dissolving the hydrophilic organic matter to convert the solid-like into a two-phase (solid and liquid) substance, which can be easily separated. The dissolution of hydrophilic organic matter such as polysaccharides and proteins by L-DME promotes the conversion of bound water into free water, which is key to total water removal.
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Affiliation(s)
- Le Chen
- College of Civil and Transportation Engineering, Hohai University, Nanjing, 210098, PR China
| | - Wei Zhu
- College of Environment, Hohai University, Nanjing, 210098, PR China.
| | - Nai-Xi Lin
- College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Biao Mu
- College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Xi-Hui Fan
- College of Civil and Transportation Engineering, Hohai University, Nanjing, 210098, PR China
| | - Chen-Yu Wang
- College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Huai-Min Chen
- College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Jun Zhong
- College of Environment, Hohai University, Nanjing, 210098, PR China
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Extraction of carotenoids and lipids from algae by supercritical CO2 and subcritical dimethyl ether. J Supercrit Fluids 2015. [DOI: 10.1016/j.supflu.2014.10.003] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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