KMnO4与PAC联用技术在净水厂工艺改造中的应用研究  

Application of KMnO4/PAC technology to process modification of water purifying plants

作　　者：董颖 吴喜军 武宏梅 高亚飞 张鹏 DONG Ying;WU Xi-jun;WU Hong-mei;GAO Ya-fei;ZHANG Peng(School of Civil Engineering,Yulin University,Yulin 719000,Shaanxi,China;Yulin High-Tech Zone Water Co.,Ltd.,Yulin 719000,Shaanxi,China;Shaanxi 185 Coalfield Geology Co.,Ltd.,Yulin 719000,Shaanxi,China)

机构地区：[1]榆林学院建筑工程学院,陕西榆林719000 [2]榆林高新区水务有限责任公司,陕西榆林719000 [3]陕西省一八五煤田地质有限公司,陕西榆林719000

出　　处：《安全与环境学报》2020年第5期1855-1861,共7页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51969031);陕西省重点研发计划项目(2020SF-412,2020SF-409);榆林市科技局项目(2019-101-3);榆林市水资源保护与高效利用重点实验室项目(2018-152-43);西北旱区生态水利国家重点实验室开放基金项目(2019KFKT-13)。

摘　　要：针对国内外部分水厂出现原水季节性锰、色度超标,出厂水存在异臭味的问题,以陕北榆林高新区水厂为例,在现有工艺基础上,提出KMnO4与PAC联用的处理工艺。首先通过室内模拟试验,确定药剂投加顺序、投加量和预氧化时间等最佳工艺参数,结果表明,先投加KMnO4、预氧化5min之后再投加PAC,KMnO4和PAC的最优投加量分别为0.3 mg/L、5 mg/L,相应滤后水的浊度、色度、锰质量浓度分别为0.28 NTU、6度、<0.05 mg/L。在模拟试验的基础上进行现场投加,结果表明,7—10月KMnO4和PAC质量浓度的生产运行投加量分别为0.3~0.6 mg/L、5.0~9.0 mg/L,其他季节为0.15~0.25 mg/L、2.5~4.5 mg/L;出水浊度、色度、锰质量浓度分别为0.18~0.49 NTU、<5度、<0.05mg/L,且有效去除了异臭味。KMnO4氧化产物水合二氧化锰对Mn2+有很好的吸附作用,因此模拟试验中KMnO4最优投加量低于理论值;而且KMnO4具有助凝作用,减少了PAC的投加量,使单方水的生产成本降低了4%。KMnO4与PAC联用技术在净水厂工艺改造中具有很好的适用性,该研究成果可为原水出现突发性、季节性锰超标的水厂提供经验借鉴。The present paper has proposed the KMnO4/PAC technology and its extended application to the water purification plants in Yulin High-Tech Zone of northern Shaanxi based on the currently adopted technological process.Its purpose is to overcome such problems like the over concentration rate of the manganese and chroma in the raw water seasonally as well as the abnormal odor in the water treated.To achieve the purpose,we have,first of all,managed to determine the optimum parameters,such as the dosing sequence,dosing amount,and pre-oxidation time through a series of simulation experiments.The experiments we have conducted demonstrate that:it is reasonable to add KMnO4,first of all,and,then,to add PAC after stirring during the time length of 62 r/min to oxidize the water to be treated for 5 min,and finally to get the optimized dosages of KMnO4and PAC per 0.3 mg/L and 5 mg/L.The turbidity,chroma,and manganese in the filtered water should be made equal to0.28 NTU,6 degree,and<0.05 mg/L,respectively,thus,showing that the water quality proves to be up to the standard.And,secondly,based on the simulation experiments,we have managed to conduct the field tests,with the outcome of the experiments revealing that the respective dosages of KMnO4and PAC were turning to be equal to 0.3-0.6 mg/L and 5.0-9.0mg/L from July to October,0.15-0.25 mg/L and 2.5-4.5mg/L for the other seasons.Besides,the content rates of turbidity,chroma,and manganese in the treated water prove to be equal to 0.18-0.49 NTU,<5 degree,and<0.05 mg/L,correspondingly and respectively.This may suggest that the abnormal odor has also been successfully removed,so that the water quality turns out much better than that before KMnO4added.At the same time,through Mn2+being oxidized from KMnO4,Mn2+can also is adsorbed through manganese dioxide hydrated,so that the dosage of KMnO4has been made lower than the theoretical indicators nominated in the simulation experiment.And,furthermore,KMnO4can also help to promote coagulation,so as to reduce the dosage of PAC required and

关 键 词：环境工程学 净水厂 高锰酸钾 锰超标 色度 异臭味 

分 类 号：X524[环境科学与工程—环境工程]