Abstract:

In arid areas，the fine chemical wastewater is treated to various reuse water quality standards such as park greening，fiber crop water and ecological forest greening water through new sewage treatment projects. It can provide auxiliary water sources for the local area while preventing wastewater pollution. In response to the poor biodegradability of fine chemical wastewater in a certain park in Hexi region of Gansu Province，ozone oxidation was designed to increase the B/C of wastewater from 0.12 to 0.33，creating conditions for biological treatment. After biochemical and advanced treatment，refractory organics were removed by using electrochemical oxidation，so that the CODof the effluent was less than 30 mg/L. Electrochemical oxidation played a guarantee role in meeting the effluent standards，with a removal rate of over 75% for difficult to degrade organic compounds，including 91.25% for toluene，85.71% for volatile phenols，and 85.71% for amines. Cost accounting showed that the total investment of project construction was 265.967 6 million yuan，and the direct cost during the operation period was 2.580 yuan/t. The operation effect of this project was good，which could save over 2.3 million cubic meters of fresh water annually in the local area.

Key words: fine chemical wastewater, ozone oxidation, electrochemistry, reuse water, arid area

摘要：

在干旱地区通过新建污水处理工程将精细化工废水处理至达到园区绿化、纤维作物用水及生态林地绿化用水等多种回用水水质标准要求，在防止废水污染环境的同时可为当地提供辅助水源。针对甘肃省河西地区某园区精细化工废水可生化性极差的特点，设计利用臭氧氧化将废水B/C从0.12提升至0.33，为生物处理创造条件，之后经过生化及深度处理后采用电化学氧化进一步去除难降解有机物，使出水COD低于30 mg/L。电化学氧化对出水达标起到了保障作用，其对难降解有机物去除率达75%以上，其中对甲苯、挥发酚、胺类的去除率分别为91.25%、85.71%、85.71%。成本核算表明，项目建设总投资26 596.76万元，运行期直接费用2.580元/t。该工程运行效果良好，每年可节约当地新鲜用水量230万m³以上。

关键词: 精细化工废水, 臭氧氧化, 电化学, 回用水, 干旱地区

CLC Number: 

• X703.1