1 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, P.R China.
2 Chemical Engineering Department, Vrije University Brussel, Brussels, Belgium.
Waste Manag Res. 2018 Feb;36(2):140-148. doi: 10.1177/0734242X17748364. Epub 2018 Jan 6.
Organic hazardous waste often contains some salt, owing to the widespread use of alkali salts during industrial manufacturing processes. These salts cause complications during the treatment of this type of waste. Molten salt oxidation is a flameless, robust thermal process, with inherent capability of destroying the organic constituents of wastes, while retaining the inorganic ingredients in the molten salt. In the present study, molten salt oxidation is employed for treating a typical organic hazardous waste with a high content of alkali salts. The hazardous waste derives from the production of thiotriazinone. Molten salt oxidation experiments have been conducted using a lab-scale molten salt oxidation reactor, and the emissions of CO, NO, SO, HCl and dioxins are studied. Impacts are investigated from the composition of the molten salts, the types of feeding tube, the temperature of molten carbonates and the air factor. Results show that the waste can be oxidised effectively in a molten salt bath. Temperature of molten carbonates plays the most important role. With the temperature rising from 600 °C to 750 °C, the oxidation efficiency increases from 91.1% to 98.3%. Compared with the temperature, air factor has but a minor effect, as well as the composition of the molten salts and the type of feeding tube. The molten carbonates retain chlorine with an efficiency higher than 99.9% and the emissions of dioxins are below 8 pg TEQ g sample. The present study shows that molten salt oxidation is a promising alternative for the disposal of organic hazardous wastes containing a high salt content.
有机危险废物通常含有一些盐，这是由于在工业制造过程中广泛使用碱盐。这些盐在处理此类废物时会引起一些问题。熔融盐氧化是一种无火焰、坚固的热过程，具有破坏废物中有机成分的固有能力，同时将无机成分保留在熔融盐中。在本研究中，采用熔融盐氧化法处理一种高盐含量的典型有机危险废物。危险废物来自噻二嗪酮的生产。使用实验室规模的熔融盐氧化反应器进行了熔融盐氧化实验，并研究了 CO、NO、SO、HCl 和二恶英的排放。从熔融盐的组成、进料管的类型、熔融碳酸盐的温度和空气因子等方面考察了其影响。结果表明，废物可以在熔融盐浴中有效地氧化。熔融碳酸盐的温度起着最重要的作用。随着温度从 600°C 升高到 750°C，氧化效率从 91.1%提高到 98.3%。与温度相比，空气因子的影响较小，以及熔融盐的组成和进料管的类型。熔融碳酸盐对氯的保留效率高于 99.9%，二恶英的排放量低于 8 pg TEQ g 样品。本研究表明，熔融盐氧化是一种处理高盐含量有机危险废物的有前途的替代方法。
