维生素C生产废水处理工艺优化研究

Experimental Study on Optimized Process for Treatment of Vitamin C- Producing Effluents

采用生化-物化-再生化的废水处理优化工艺,研究了利用生产产生的废碳、废酸水为原料对IC厌氧生化出水进行铁炭微电解与Fenton法组合深度处理,净化絮凝沉淀除去反应产生物,提高出水的可生化性,COD去除率提高56%;进行好氧污泥耐盐驯化,COD去除率进一步提高15%。通过单因素实验对比,选定铁炭比为1:1,停留时间为30 min,双氧水投加量为0.2 mL/L,壳聚糖为助凝剂,最终使废水中COD由12 000 mg/L降到50 mg/L以下,COD去除率达到99.5%以上。经过生产试运行,出水COD稳定达到规定的排放标准COD≤50 mg/L,该优化工艺于2011年12月8日通过省级成果鉴定。

This paper described an experiment carried out using a bench scale experimental installation with a combined process incorporating anaerobic, physico/chemical and aerobic techniques for treating vitamin C-producing wastewater, in which physico/chemical process was characterized by iron-carbon micro electrolysis, Fenton process and flocculation/ sedimentation, which followed the IC and played a role to improve biodegradability of the wastewater; furthermore, the acclimatization of salt tolerance of aerobic sludge upgraded COD removal by 15%. By using the single factor experimental comparison method, the optimized result was obtained with COD removal as high as 99.5%. According to the author, a pilot experiment was successfully conducted on a vitamin C production line using process based on the bench-scale experiment.