【作者】 刘源月；

【导师】 郑爽英；

【作者基本信息】 西南交通大学 ， 环境工程， 2004， 硕士

【摘要】 中药制药废水具有COD、BOD、SS浓度高以及pH值低的特点，是一种难处理的酸性有机废水。受废水高酸度的影响，采用常规的生物或物理化学方法难以满足处理的技术和经济要求，处理这类高浓度工业废水已成为现阶段国内外环境保护技术领域中亟待解决的一个难题。为解决废水酸度对处理方法的限制，本文采用二氧化氯氧化法对中药废水进行了氧化降解试验研究，初步发现了二氧化氯处理中药废水的氧化规律。本项试验工作的完成不仅为二氧化氯处理中药废水的进一步研究提供基础数据，而且也为酸性高浓度废水的处理提供了新思路。 使用稳定性二氧化氯溶液氧化降解中药废水，以废水COD变化作为评价氧化效率的重要指标，考察了常温、常压（291～298K，1.013×10⁵Pa）下二氧化氯起始浓度（以[ClO₂]：[COD]表示）、pH值、氧化反应时间等主要因素对中药制药废水处理效果的影响。 采用正交设计方法确定试验方案，进行了三组48次氧化降解试验，对试验结果的分析研究表明：（1）当ClO₂与COD比值在1.0～0.4范围时，COD的平均去除率达到42％以上：当该比值大于1.0或小于0.4时，COD平均去除率仅为27％～35％。（2）当pH=2.0～4.0时，COD去除率可以达到40％以上，且pH≥10.0时，COD去除率高达59％。（3）COD去除率随着反应时间的延长而升高，氧化反应30min左右，COD去除率即能达到40％以上，105min后处理效率达到63％。（4）在常温、常压下，影响处理效果的各因素的主次顺序是：反应时间，二氧化氯起始浓度，pH值；处理的最佳工艺条件为：[ClO₂]：[COD]为0.7：1，反应pH值6.0，反应时间105min，COD去除率为49％，BOD₅去除率75％。更多还原

【Abstract】 Chinese traditional medicine wastewater is a kind of acidic organic wastewater to be hardly treated with the characteristics of high concentration of COD, BOD, SS and low pH value. Because of this, the traditional biological or physical chemistry techniques can not make the wastewater clean enough to satisfy the treatment criteria at an acceptable expense. Thus, it is a difficult problem to be solved to treat the high concentrated industrial wastewater in the field of environmental protection techniques in our country. In order to solve the problem of wastewater acidity restricting the treatment ways, the oxidation method of chlorine dioxide is adapted to dispose the Chinese traditional medicine wastewater in laboratory scale studies in this thesis. The oxidation law of that the Chinese traditional medicine wastewater is treated by chlorine dioxide has been discovered. The experimental researches provide not only the basic data for the further studies of chlorine dioxide disposing Chinese traditional medicine wastewater, but also the new idea of treating the acidic wastewater with high concentration.The contaminations of Chinese traditional medicine wastewater are oxidated and decomposed by using stabilized chlorine dioxide solution as an oxidant. Taking the chemical oxygen demand (COD) of the wastewater as the index of oxidation efficiency, the influences of the original concentration of chlorine dioxide (expressed by [ClO2]: COD), pH value and reaction time on the disposal effect of the Chinese traditional medicine wastewater are investigated under the condition of the normal temperature (291-298K) and normal atmospheric pressure (1.013x105 Pa).The experiment project is determined by orthogonal design method and 48 oxidation decomposition experiments divided into 3 groups are carried out. The analyses and researches of the experimental results show that: (1) when the ratio of C1O2 to COD is the range of 1.0 ~ 0.4, the average removal rate of COD exceeds 42%, and when this ratio is greater than 1.0 or smaller than 0.4, the average removal rate of COD is only 27 ~ 35%; (2) when the pH value equals 2.0 ~ 4.0, the removal rate of COD exceeds 40%, and when the pH value is equal to or greater than 10.0, the removal rate of COD can reach 59%; (3) with the increase of the reaction time, the removal rate of COD increases, and whenthe time of oxidation reaction is about 30 min, the removal rate of COD can arrive at 40%, besides, when the time is 105 min the corresponding value reaches 63%; (4) under the condition of the normal temperature and normal atmospheric pressure, the primary and secondary order of the factors affecting the disposal effect of Chinese traditional medicine wastewater is the reaction time, the initial concentration of chlorine dioxide and the pH values, the best technological conditions of treating Chinese traditional medicine wastewater are that the ratio of ClO2 to COD is 0.7, the pH value is 6.0 and the reaction time is 105 min, the corresponding removal rate of COD is 49% and that of BOD5 is 75%.更多还原