Chlorobenzene Release During Thermal Drying of Sludge: Mechanism and Source

Dai, Zhixi; Tian, Lixun; Liu, Chongxuan; Weng, Huanxin

Chlorobenzene Release During Thermal Drying of Sludge: Mechanism and Source

2017

Dai, Zhixi | Tian, Lixun | Liu, Chongxuan | Weng, Huanxin

A dispersive liquid–liquid microextraction (DLLME) method was optimized for the detection of chlorobenzene (CB) compounds in the drying process of municipal and dyeing sludge. Compared with traditional methods, the optimized DLLME not only has a lower limit of detection but also saves analysis time and requires less amount of organic solvent. Using this method in analyzing CB release during sludge drying, we found that drying temperature is the main factor controlling the amount of chlorobenzene release during sludge drying. In addition, we found that most CBs were released when sludge drying entered into the second falling rate stage, i.e., a period when sludge moisture content was low and temperature was high. By analyzing organic matter content in association with CB release during sludge drying, the relationship between organic matter transformation and chlorobenzene release was established. The results provide scientific basis and technical support for assessing the risks of the secondary pollution of CBs from sludge drying.

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