碱催化脱氯技术处理氯代新POPs研究及示范工程

以硫丹作为氯代新POPs的代表,通过实验室小试研究,探讨反应温度、NaOH和石蜡油投加量对硫丹在NaOH/石蜡油碱催化反应体系中的去除和脱氯效率(RE和DE)的影响,并寻找出最优条件,开展示范工程研究.实验室小试结果表明,反应温度、NaOH投加量和石蜡油投加量对硫丹脱氯效率的影响要大于对其去除率的影响.当温度为250℃,硫丹和NaOH及石蜡油的质量比为1:3:6和1:3:10时,反应3h后,硫丹去除率和脱氯效率分别达到99.99%和99%以上.采用硫丹和得克隆两种氯代有机物开展示范工程研究,中试设备处理能力达到15kg/批次,在250~300℃下反应3~10h后,对硫丹和得克隆的去除效率均达到99.9%以上,表明硫丹和得克隆被有效分解.示范工程的成功实施为我国履行斯德哥尔摩公约提供技术支持.

Lab and pilot scale studies of chlorinated new POPs destruction using base-catalyzed dechlorination method

Base-catalyzed dechlorination (BCD) is a mature non-incineration method for the detoxification of persistent organic pollutants (POPs). However, little research has focused on the destruction of chlorinated new POPs with this method. In this study, endosulfan was used as a case compound to investigate the influences of temperature, NaOH and paraffin oil amounts on the removal and dechlorination efficiencies (RE and DE) in NaOH/paraffin oil BCD system. The optimal condition obtained from the lab-scale experiments was further verity in a pilot-study. Laboratory study results indicated that the influences of temperature, NaOH and paraffin oil amounts on DE were more obvious than RE. When the optimal mass ratio of endosulfan: NaOH: paraffin oil was 1:3:6~10 and incubated at 250℃ for 3h, the RE and DE was over 99.99% and 99.9%, respectively. The optimal condition was applied to pilot-experiment, with a treatment capacity of 15kg/batch. In addition to endosulfan, dechlorane plus was also used in the pilot-experiment. After heating at 250~300℃ for 3~10h, the RE of endosulfan and dechlorane plus was higher than 99.9%, which implied the wastes were effectively destructed. The successful performance of the pilot scale study would technically support the obligation of Stockholm Convention of country.