Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment
In this study, two types of sewage sludge (primary sludge and waste activated sludge) were hydrothermally treated at 125–250 °C to enhance the lipid extraction efficiency and obtain a higher biodiesel yield. The enhanced efficiency of the lipid extraction method was compared with the efficiency of t...
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MDPI AG
2020-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/23/6392 |
| _version_ | 1827700819330334720 |
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| author | Jongkeun Lee Oh Kyung Choi Dooyoung Oh Kawnyong Lee Ki Young Park Daegi Kim |
| author_facet | Jongkeun Lee Oh Kyung Choi Dooyoung Oh Kawnyong Lee Ki Young Park Daegi Kim |
| author_sort | Jongkeun Lee |
| collection | DOAJ |
| description | In this study, two types of sewage sludge (primary sludge and waste activated sludge) were hydrothermally treated at 125–250 °C to enhance the lipid extraction efficiency and obtain a higher biodiesel yield. The enhanced efficiency of the lipid extraction method was compared with the efficiency of the organic solvent extraction method. The results confirmed that a hydrothermal reaction could be an appropriate option for disrupting sludge cell walls and increasing the lipid extraction from sewage sludge. The highest lipid recovery efficiency was observed at 200 °C, and the lipid recovery efficiency of primary sludge and waste activated sludge increased from 7.56% and 5.35% to 14.01% and 11.55% by weight, respectively. Furthermore, transesterified lipids, such as biodiesel from sewage sludge, mostly consist of C16 and C18 methyl esters, and have features similar to those of jatropha oil-based biodiesel. During the hydrothermal treatment, the carbon content in the sludge decreased as the carbon transformed into lipids and the lipids were extracted. The volatile matter and fixed carbon content in the solid residue decreased and increased, respectively, through chemical dehydration and decarboxylation reactions under hydrothermal reaction conditions. |
| first_indexed | 2024-03-10T14:20:18Z |
| format | Article |
| id | doaj.art-3e59bf45875d425a8f71f32a28f25764 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T14:20:18Z |
| publishDate | 2020-12-01 |
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| series | Energies |
| spelling | doaj.art-3e59bf45875d425a8f71f32a28f257642023-11-20T23:23:53ZengMDPI AGEnergies1996-10732020-12-011323639210.3390/en13236392Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal PretreatmentJongkeun Lee0Oh Kyung Choi1Dooyoung Oh2Kawnyong Lee3Ki Young Park4Daegi Kim5Department of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul 05029, KoreaDepartment of Environmental Engineering, College of Science and Technology, Korea University, Sejong-si 30019, KoreaDepartment of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul 05029, KoreaDepartment of Environment & Health, Jangan University, Gyeonggi-do 18331, KoreaDepartment of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul 05029, KoreaDepartment of Environmental Engineering, College of Engineering, Daegu University, Gyeongsangbuk-do 38453, KoreaIn this study, two types of sewage sludge (primary sludge and waste activated sludge) were hydrothermally treated at 125–250 °C to enhance the lipid extraction efficiency and obtain a higher biodiesel yield. The enhanced efficiency of the lipid extraction method was compared with the efficiency of the organic solvent extraction method. The results confirmed that a hydrothermal reaction could be an appropriate option for disrupting sludge cell walls and increasing the lipid extraction from sewage sludge. The highest lipid recovery efficiency was observed at 200 °C, and the lipid recovery efficiency of primary sludge and waste activated sludge increased from 7.56% and 5.35% to 14.01% and 11.55% by weight, respectively. Furthermore, transesterified lipids, such as biodiesel from sewage sludge, mostly consist of C16 and C18 methyl esters, and have features similar to those of jatropha oil-based biodiesel. During the hydrothermal treatment, the carbon content in the sludge decreased as the carbon transformed into lipids and the lipids were extracted. The volatile matter and fixed carbon content in the solid residue decreased and increased, respectively, through chemical dehydration and decarboxylation reactions under hydrothermal reaction conditions.https://www.mdpi.com/1996-1073/13/23/6392hydrothermal reactionlipid recoverysewage sludgebiodieselrenewable energy |
| spellingShingle | Jongkeun Lee Oh Kyung Choi Dooyoung Oh Kawnyong Lee Ki Young Park Daegi Kim Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment Energies hydrothermal reaction lipid recovery sewage sludge biodiesel renewable energy |
| title | Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment |
| title_full | Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment |
| title_fullStr | Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment |
| title_full_unstemmed | Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment |
| title_short | Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment |
| title_sort | stimulation of lipid extraction efficiency from sewage sludge for biodiesel production through hydrothermal pretreatment |
| topic | hydrothermal reaction lipid recovery sewage sludge biodiesel renewable energy |
| url | https://www.mdpi.com/1996-1073/13/23/6392 |
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