Synergistic Effects of Initial Moisture Content and Particle Size on Drying Rate and Heat Production during Bio-Drying of Sludge after Electro-Dewatering

Synergistic Effects of Initial Moisture Content and Particle Size on Drying Rate and Heat Production during Bio-Drying of Sludge after Electro-Dewatering

Electro-dewatered sludge (EDS) can be bio-dried alone, instead of adding bulking agents. The initial moisture content (IMC) and particle size of the electro-dewatered sludge affect the efficiency and energy consumption during the bio-drying process. This study aimed to investigate the synergistic ef...

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Veröffentlicht in:ACS sustainable chemistry & engineering 2023-01, Vol.11 (1), p.278-289
Hauptverfasser: Li, Qian, Yang, Zengjun, Kong, Hao, Zhang, Keqiang, Guo, Haigang, Zheng, Xiangqun
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Yang, Zengjun
Kong, Hao
Zhang, Keqiang
Guo, Haigang
Zheng, Xiangqun
description Electro-dewatered sludge (EDS) can be bio-dried alone, instead of adding bulking agents. The initial moisture content (IMC) and particle size of the electro-dewatered sludge affect the efficiency and energy consumption during the bio-drying process. This study aimed to investigate the synergistic effects of sludge IMC and particle size on the drying rate and heat production of bio-drying with EDS. Experiments were conducted with two different IMC sludge and two different sludge particle sizes. Results showed that the highest moisture removal rate was 43.18% in treatment T4, which had materials with a smaller particle size (
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The initial moisture content (IMC) and particle size of the electro-dewatered sludge affect the efficiency and energy consumption during the bio-drying process. This study aimed to investigate the synergistic effects of sludge IMC and particle size on the drying rate and heat production of bio-drying with EDS. Experiments were conducted with two different IMC sludge and two different sludge particle sizes. Results showed that the highest moisture removal rate was 43.18% in treatment T4, which had materials with a smaller particle size (&lt;3 mm) and lower IMC (38.69%). And bio-drying of T4 had the highest biological heat production (7413.14 kJ, i.e., 741.31 kJ/kg sludge), and the lowest bio-drying index (the ratio of water loss to volatile solid loss) was 7.10 among the four treatments. Five thin-layer drying kinetic models and a nonlinear regression method were analyzed to estimate the bio-drying kinetic parameters. The Midilli et al. model had a better fitting result, and the highest R 2 value was 0.9929 during bio-drying of EDS. The new coefficients k (0.1465) and n (1.0898) were obtained. Through the heat balance, the heat used for evaporation was 40–57% of the total energy consumption (5873–9140 kJ). According to the PCA, the particle size had a great influence on the bio-drying process. Also, the particle size positively correlated with temperature, moisture ratio, and drying rate.</description><identifier>ISSN: 2168-0485</identifier><identifier>EISSN: 2168-0485</identifier><identifier>DOI: 10.1021/acssuschemeng.2c05429</identifier><language>eng</language><publisher>American Chemical Society</publisher><ispartof>ACS sustainable chemistry &amp; engineering, 2023-01, Vol.11 (1), p.278-289</ispartof><rights>2022 American Chemical Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-a243t-1f9cb1f7f78fd8a9d140d88a74e940e0c9f2cf569c4f437fb87f98362180a8b33</cites><orcidid>0000-0002-6136-0929 ; 0000-0002-5791-7907</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/acssuschemeng.2c05429$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/acssuschemeng.2c05429$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>315,781,785,2766,27078,27926,27927,56740,56790</link.rule.ids></links><search><creatorcontrib>Li, Qian</creatorcontrib><creatorcontrib>Yang, Zengjun</creatorcontrib><creatorcontrib>Kong, Hao</creatorcontrib><creatorcontrib>Zhang, Keqiang</creatorcontrib><creatorcontrib>Guo, Haigang</creatorcontrib><creatorcontrib>Zheng, Xiangqun</creatorcontrib><title>Synergistic Effects of Initial Moisture Content and Particle Size on Drying Rate and Heat Production during Bio-Drying of Sludge after Electro-Dewatering</title><title>ACS sustainable chemistry &amp; engineering</title><addtitle>ACS Sustainable Chem. 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Five thin-layer drying kinetic models and a nonlinear regression method were analyzed to estimate the bio-drying kinetic parameters. The Midilli et al. model had a better fitting result, and the highest R 2 value was 0.9929 during bio-drying of EDS. The new coefficients k (0.1465) and n (1.0898) were obtained. Through the heat balance, the heat used for evaporation was 40–57% of the total energy consumption (5873–9140 kJ). According to the PCA, the particle size had a great influence on the bio-drying process. 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Eng</addtitle><date>2023-01-09</date><risdate>2023</risdate><volume>11</volume><issue>1</issue><spage>278</spage><epage>289</epage><pages>278-289</pages><issn>2168-0485</issn><eissn>2168-0485</eissn><abstract>Electro-dewatered sludge (EDS) can be bio-dried alone, instead of adding bulking agents. The initial moisture content (IMC) and particle size of the electro-dewatered sludge affect the efficiency and energy consumption during the bio-drying process. This study aimed to investigate the synergistic effects of sludge IMC and particle size on the drying rate and heat production of bio-drying with EDS. Experiments were conducted with two different IMC sludge and two different sludge particle sizes. Results showed that the highest moisture removal rate was 43.18% in treatment T4, which had materials with a smaller particle size (&lt;3 mm) and lower IMC (38.69%). And bio-drying of T4 had the highest biological heat production (7413.14 kJ, i.e., 741.31 kJ/kg sludge), and the lowest bio-drying index (the ratio of water loss to volatile solid loss) was 7.10 among the four treatments. Five thin-layer drying kinetic models and a nonlinear regression method were analyzed to estimate the bio-drying kinetic parameters. The Midilli et al. model had a better fitting result, and the highest R 2 value was 0.9929 during bio-drying of EDS. The new coefficients k (0.1465) and n (1.0898) were obtained. Through the heat balance, the heat used for evaporation was 40–57% of the total energy consumption (5873–9140 kJ). According to the PCA, the particle size had a great influence on the bio-drying process. Also, the particle size positively correlated with temperature, moisture ratio, and drying rate.</abstract><pub>American Chemical Society</pub><doi>10.1021/acssuschemeng.2c05429</doi><tpages>12</tpages><orcidid>https://orcid.org/0000-0002-6136-0929</orcidid><orcidid>https://orcid.org/0000-0002-5791-7907</orcidid></addata></record>
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