化工进展2017，Vol.36Issue(5)：1906-1913,8.DOI:10.16085/j.issn.1000-6613.2017.05.044
湿式氧化降解高氯化工废水实验研究及经济性分析
Research on wet air oxidation of high-chloride chemical wastewaters and economic analysis
摘要
Abstract
High-chloride chemical wastewaters with higher organics concentration and strong causticity,is a great challenge in industrial wastewater treatment. We have investigated the effects of reaction temperatures,residence time,and catalyst Fe2+ content on TOC removal of the wastewater during wet air oxidation,and corrosion characteristics of candidate materials under atmospheres higher 20oC than obtained optimal reaction temperature. On the basis of the above research,a comprehensive treatment process for this wastewater was also built. The results showed that a residence time of 60 min,a reaction temperature of 280℃,and catalyst Fe2+ amount of 100 mg/L was the optimum set of technological parameters for the degradation of the high-chloride chemical wastewater,under which the TOC removal rate was as high as 97.9%. For condition of 300℃,pH=13,nickel alloys(N10276 and N06625)suffered serious corrosion due to trans-passivation dissolution of alloying elements such as chromium and molybdenum in strong oxidizing & alkaline solutions,alkaline dissolution of solid nickel oxides or hydroxides,along with attacks of chloride ions against protective oxides film produced on alloys surface,while surface damage of titanium alloy TA10 also occurred,which mainly derived from strong alkalinity of environmental mediums(pH=13)causing chemical dissolution of the protective titanium oxides. If initial pH value of the corrosion media was adjusted to about 7.5,the corrosion rate of three alloys decreased obviously,and alloy TA10 showed satisfactory corrosion resistance. The economic analysis of wet air oxidation process for the high-chloride chemical wastewater with a capacity of 30 tons per day,indicated that the project total investment is 20.78 million Yuan,while the wastewater processing cost is 470.2 Yuan per ton.关键词
湿式氧化/废水/高氯化工废水/废物处理/镍基合金/钛合金/腐蚀/经济性分析Key words
wet air oxidation/wastewater/high-chloride chemical wastewater/waste treatment/nickel alloy/titanium alloy/corrosion/economic analysis分类
资源环境引用本文复制引用
李艳辉,王树众,孙盼盼,杨闯,王来升,张拓,郭洋..湿式氧化降解高氯化工废水实验研究及经济性分析[J].化工进展,2017,36(5):1906-1913,8.基金项目
国家自然科学基金(51406146)、中国博士后科学基金(126540)、江苏省自然科学基金(BK20140406)及陕西省自然科学基金(BK20140406)项目. （51406146）
