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

Rui Chai, Jinqing Wang (), Mingxiu Zhan, Dingkun Yuan, Zuohe Chi, Hailin Gu and Jiani Mao
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Rui Chai: College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Jinqing Wang: College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Mingxiu Zhan: College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Dingkun Yuan: College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Zuohe Chi: College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Hailin Gu: College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
Jiani Mao: College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China

IJERPH, 2022, vol. 19, issue 24, 1-11

Abstract: 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.

Keywords: soil pre-drying; non-isothermal drying; indirect rotary dryer; pollutant desorption; volumetric heat transfer coefficient (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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