含有机砷废物无害化处理方法

Study on the treatment of organic arsenic containing waste

含砷农药中间体生产过程中产生1种含有机砷的釜残,属于《国家危险废物名录》中第HW24类废物,釜残的含砷量高,现有的焚烧法、固化填埋处理方法无法使其达到无害化处理的标准.本处理方法的研究是采取在一定条件下,用氧化剂氧化釜残,使固态废物中的砷通过有机物氧化破链溶解转移至水溶液中,同时将含有的三价砷全部转化成五价砷降低毒性,然后进行固液分离,废水经处理达到国家相关排放标准后,排放至城镇污水处理厂,废水处理过程中产生的废渣连同氧化分离出的废渣进行固化填埋处理,达到无害化处理的目的.

The production of organic arsenic containing pesticides intermediates results in the residue with high concentration of organic arsenic,the residue is classified as HW24 in the national catalogue of hazardous wastes.Conventional treatments,such as incineration and landfill,can not realize the innocent treatment of this kind of waste.In this paper,organic arsenic is oxidized from aesenite to arsenate,which is soluble in water,solid residue and waste water are separated.The waste water is treated before it is discharged to municipal waste water plant,the residue are disposed at landfill site.