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Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation

In response to the current problem of the high energy consumption of direct thermal desorption systems when treating soils with a high moisture content, we propose using the waste heat of the system to pre-dry soil to reduce its moisture. Taking chlorine–organic-contaminated soil as an object, an ex...

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Autores principales: Chai, Rui, Wang, Jinqing, Zhan, Mingxiu, Yuan, Dingkun, Chi, Zuohe, Gu, Hailin, Mao, Jiani
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9779612/
https://www.ncbi.nlm.nih.gov/pubmed/36554489
http://dx.doi.org/10.3390/ijerph192416607
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author Chai, Rui
Wang, Jinqing
Zhan, Mingxiu
Yuan, Dingkun
Chi, Zuohe
Gu, Hailin
Mao, Jiani
author_facet Chai, Rui
Wang, Jinqing
Zhan, Mingxiu
Yuan, Dingkun
Chi, Zuohe
Gu, Hailin
Mao, Jiani
author_sort Chai, Rui
collection PubMed
description In response to the current problem of the high energy consumption of direct thermal desorption systems when treating soils with a high moisture content, we propose using the waste heat of the system to pre-dry soil to reduce its moisture. Taking chlorine–organic-contaminated soil as an object, an experimental study on the drying and pollutant desorption characteristics of soil in an indirect rotary dryer was carried out. The results show that the non-isothermal drying process was divided into warm-up and falling rate periods, and no constant period was observed. The higher the rotation speed, the lower the soil outlet temperature and the higher the drying tail gas temperature. Soil outlet and dry tail gas temperatures were lower for soils with a higher moisture content. Benzene and cis-1,2-dichloroethylene are easily desorbed. Therefore, the disposal of dry tail gas should be determined according to the type and concentration of soil pollutants present. The volumetric heat transfer coefficient was found to be 85–100 W m(−3) °C(−1), which provides a key parameter for the size design of a rotary dryer.
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spelling pubmed-97796122022-12-23 Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation Chai, Rui Wang, Jinqing Zhan, Mingxiu Yuan, Dingkun Chi, Zuohe Gu, Hailin Mao, Jiani Int J Environ Res Public Health Article In response to the current problem of the high energy consumption of direct thermal desorption systems when treating soils with a high moisture content, we propose using the waste heat of the system to pre-dry soil to reduce its moisture. Taking chlorine–organic-contaminated soil as an object, an experimental study on the drying and pollutant desorption characteristics of soil in an indirect rotary dryer was carried out. The results show that the non-isothermal drying process was divided into warm-up and falling rate periods, and no constant period was observed. The higher the rotation speed, the lower the soil outlet temperature and the higher the drying tail gas temperature. Soil outlet and dry tail gas temperatures were lower for soils with a higher moisture content. Benzene and cis-1,2-dichloroethylene are easily desorbed. Therefore, the disposal of dry tail gas should be determined according to the type and concentration of soil pollutants present. The volumetric heat transfer coefficient was found to be 85–100 W m(−3) °C(−1), which provides a key parameter for the size design of a rotary dryer. MDPI 2022-12-10 /pmc/articles/PMC9779612/ /pubmed/36554489 http://dx.doi.org/10.3390/ijerph192416607 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chai, Rui
Wang, Jinqing
Zhan, Mingxiu
Yuan, Dingkun
Chi, Zuohe
Gu, Hailin
Mao, Jiani
Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation
title Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation
title_full Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation
title_fullStr Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation
title_full_unstemmed Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation
title_short Pre-Drying of Chlorine–Organic-Contaminated Soil in a Rotary Dryer for Energy Efficient Thermal Remediation
title_sort pre-drying of chlorine–organic-contaminated soil in a rotary dryer for energy efficient thermal remediation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9779612/
https://www.ncbi.nlm.nih.gov/pubmed/36554489
http://dx.doi.org/10.3390/ijerph192416607
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