KMnO_4预氧化法处理中草药制药废水技术研究

Study on KMnO_4 preoxidation process treating wastewater from Chinese herbal medicine manufacturing

为了提高制药废水的可生化性,采用KMnO4预氧化法对其进行预处理,探讨了反应温度、反应时间、溶液pH值、氧化剂投加量等因素对去除废水中CODCr等污染物浓度的影响,结果表明,最佳反应条件为:KMnO4投加量为13 mg/L,氧化反应温度为60℃,氧化反应时间为25 min,pH值为6,处理后废水各项指标均达到了GB 8978—1996《污水综合排放标准》的要求。预氧化法显著提高了废水的可生化性,有利于后续生化处理的进行。

In order to improve the biodegradability of the wastewater from Chinese herbal medicine manufacturing, KMn04 preoxidation process was used for its pretreatment, and the effects of reaction temperature, reaction time, pH value of the solution, oxidant dosage and some other factors on CODcr and some other pollutants removal were discussed. The results showed that, the optimal reaction condition was as follows： the KMnO4 dosage was 13 mg/L, the reaction temperature was 60 ℃, the reaction time was 25 min, the pH value was 6. After the treatment, the effluent water quality met the requirement of GB 8978--1996 Intergrated Wastewater Discharge Standard. It could be seen that, preoxidant process could significantly improve the biodegradability of the wastewater, which was benefit for subsequent biochemical treatment.