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两种典型高级氧化工艺降解污水厂尾水

作者:完美论文网  来源:www.wmlunwen.com  发布时间:2019/10/29 8:06:52  

摘要:有色可溶性有机物(CDOM)在自然水体中分布广泛,其不仅会对水体环境造成一定的影响,而且会使水处理过程面临重大的挑战。本文使用三维荧光技术组合PARAFAC表征污水厂尾水CDOM,探究CDOM中有效组分的时空演变规律;利用响应面设计评估UV/H2O2工艺对污水厂尾水CDOM降解效果,并对CDOM降解的影响因素进行分析与优化;研究时间、O3浓度、pH、H2O2投加量、抑制剂等对O3/H2O2工艺的影响。

本文针对某城市污水厂尾水,采用三维荧光光谱对尾水及受纳水体进行12个月的测量,同时使用PARAFAC对尾水中CDOM解析,提取出3个有效组分。尾水中CDOM在时间变化上呈现先增长后下降的趋势,夏季尾水中难降解物质含量高。在空间分布方面,受纳水体(尾水闸口)表现出和污水厂尾水基本一致的荧光特征,尾水CDOM的组成和结构特征对受纳水体有明显的影响,下游80 m处受到外来污染的影响荧光强度和组分有一定的差异。

本文进一步利用UV/H2O2高级氧化工艺深度处理污水厂尾水中CDOM,使用响应面设计20组实验,考察紫外光强、时间和H2O2投加量等因素对反应的影响,基于三维荧光和PARAFAC提取出3个有效组分色氨酸、类腐殖酸、酪氨酸。使用响应面分析优化实验结果,预测值接近实验结果,这表明响应面模型能够有效模拟实验过程并优化反应条件,为UV/H2O2工艺的工程应用和尾水深度处理技术优化提供参考。

最后,本文使用O3/H2O2高级氧化工艺对CDOM进行深度处理,研究降解过程中荧光谱图的变化规律,评估尾水中CDOM的处理效果,探究反应时间、pH、H2O2投加量和抑制剂等对处理工艺的影响。使用PARAFAC得出3个有效荧光组分C1(腐殖质类)、C2(腐殖质类)和C3(蛋白类)。在不同反应条件下,荧光组分C3的去除率均大于荧光组分C1和C2,这说明蛋白类组分更容易被O3/H2O2工艺降解。O3对处理工艺起促进作用,H2O2超过一定范围后去除效果下降,碱性体系不利于O3/H2O2降解效果。

Colored dissolved organic matter(CDOM) iswidely distributed in natural water bodies.CDOM notonly has a certain impact on the water environment,butalso presents challenges to the water treatment processes. In this paper, threedimensional fluorescence combined with parallel factor analysis was used tocharacterize CDOM of sewage plant tail water. The temporal and spatialevolution of effective fluorescence components in CDOM was explored. Thedegradation effect of O3/H2O2 advanced oxidation process on CDOM was evaluatedby using the response surface design, as well as the influencing factors ofCDOM removal were analyzed and optimized. The effects of reaction time, O3 flowrate, initial pH, H2O2 dosage and inhibitor on advanced oxidation process ofO3/H2O2 were investigated.

In this paper, three dimensionalfluorescence was used to measure the tail water and the receiving water for 12months in wastewater treatment plant. Three effective fluorescent componentswere successfully extracted. CDOM in tail water showed a trend of firstincrease and then decrease. The concent of insoluble organics was high insummer. In terms of spatial distribution, the fluorescence characteristics ofthe receiving water is basically the same as the tail water of the wastewaterplant. The composition and structural characteristics of tail water CDOM had asignificant effect on the receiving water. Affected by external pollution,there were some differences in fluorescence intensity and composition at 80meters downstream.

In this paper, UV/H2O¬2 advanced oxidationprocess was used to treat CDOM in tail water of wastewater treatment plant. 20groups of experiments were designed by response surface methodology, and theeffects of UV intensity, time and H2O2 dosage on the reaction wereinvestigated. Based on the three-dimensional fluorescence contained withPARAFAC, the results show that three effective fluorescence components weresuccessfully extracted from tail water CDOM, including C1(humic-likesubstances), C2(humic-like substances) and C3(protein-like substances).Response surface model can effectively reflect and predict the reaction resultsand optimize reaction conditions. The research provides reference for UV/H2O2oxidation process engineering application.

Finally, we used the advanced oxidationprocess of O3/H2O2 to further process CDOM. The changes of fluorescence spectraduring the degradation process were investigated and the degradation effect ofCDOM in tailing was evaluated. The effects of reaction time, dosage of pH, H2O2and inhibitors on the treatment process were explored. Based on thethree-dimensional fluorescence spectrum and PARAFAC, three effectivefluorescence components were successfully extracted from tail water CDOM. Underdifferent reaction conditions, the removal rate of fluorescence component C3was greater than that of fluorescence components C1 and C2, indicating that theprotein components are more easily degraded by the O3/H2O2 process. The O3 flowrate promoted the degradation, and the removal rate decreased when the H2O2dosage exceeds a certain range. Alkaline reaction system is unfavorable toO3/H2O2 reaction.

关键词:有色可溶性有机物;响应面分析;荧光光谱;平行因子分析(PARAFAC)

Colored dissolved organic matter(CDOM);Response surface analysis;fluorescence spectrum;PARAFAC

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