复合型微污染地下水源饮用水处理工艺方案研究
发布时间：2019-05-14 02:44
【摘要】：地下水是我国重要的饮用水水源。由于污染下渗、超量开采等原因,地下水水质逐年恶化,使得原本只有铁、锰超标的水源逐渐转化为复合型微污染水源,原有处理工艺无法适应恶化后的水质,复合型微污染地下水的达标处理问题亟待解决。采用两种常规的水处理工艺,氧化-过滤、曝气-接触氧化工艺处理复合型微污染地下水进行试验研究,过滤部分采用相同参数设计,对比分析二者的处理效果,优选出可行的处理方法,确定、设计复合型微污染地下水处理方案。考察、比较在相同参数设置的滤柱、滤速的条件下,高锰酸钾预氧化-过滤工艺、曝气-接触氧化工艺的处理效果。高锰酸钾投加量为16.8mg/L,预氧化时间为15min。在滤速为1 m/h时,氧化-过滤法处理后的出水铁、锰、氨氮、有机物的平均质量浓度分别为0.130 mg/L、0.163 mg/L、2.657 mg/L、0.024 mg/L,而曝气-接触氧化法滤料成熟后的出水铁、锰、氨氮、有机物的平均质量浓度分别为0.109 mg/L、0.062 mg/L、0.134 mg/L、2.781 mg/L。氧化-过滤法处理后的出水铁、锰、有机物可以达到《生活饮用水卫生标准》(GB5749-2006)要求,氨氮不能达标；曝气-接触氧化法的出水各项指标均可稳定达标。曝气-接触氧化法可保证达标的最高滤速为4m/h,出水总铁、总锰、氨氮、CODMn的质量浓度分别为0.121mg/L、0.034 mg/L、0.434 mg/L、2.170 mg/L,曝气-接触氧化法在处理该类水质方面优于高锰酸钾预氧化-过滤法。通过对氧化-过滤法、氧化吸附联用和曝气-接触氧化法的技术、经济分析与比较,确定了曝气-接触氧化法作为处理复合型微污染地下水的方法,工艺流程为：喷淋曝气一一级过滤—跌水曝气—二级过滤—二氧化氯消毒。方案设计以李官堡水厂的水源水质为目标水质,设计水量5万t/d,根据所做小试试验结果及相关中试试验成果对主要构筑物进行了论证选择及参数设计,具体参数如下：采用两组相同构筑物并联运行,每组主要由两座串联的普通快滤池组成,选取陶粒作为滤料,每座滤池中滤料层高度为1 m,滤速设置为2 m/h,反冲洗强度12 L/(m2·s),反冲洗时间5-10 min,反冲洗周期2 d。选择二氧化氯作为消毒剂。直接运行成本(不含设备维护与折旧费和人工费)0.051元/m3。
[Abstract]:Groundwater is an important drinking water source in China. Due to the infiltration of pollution and excessive exploitation, the quality of groundwater is deteriorating year by year, which makes the water source with only iron and manganese exceeding the standard gradually transformed into a compound micro-polluted water source, and the original treatment technology can not adapt to the deterioration of the water quality. The problem of reaching the standard of compound micro-polluted groundwater needs to be solved urgently. Two conventional water treatment processes, oxidation-filtration and aeration-contact oxidation, were used to treat composite micro-polluted groundwater. The filtration part was designed with the same parameters, and the treatment effects of the two processes were compared and analyzed. The feasible treatment method is selected, and the compound micro-pollution groundwater treatment scheme is determined and designed. The effects of potassium permanganate pre-oxidation-filtration process and aeration-contact oxidation process were investigated and compared under the condition of filter column and filtration speed with the same parameters. The dosage of potassium permanganate was 16.8 mg / L and the pre-oxidation time was 15 min. When the filtration rate is 1 m 路h, the average mass concentrations of iron, manganese, ammonia nitrogen and organic matter treated by oxidation-filtration method are 0.130 mg/L,0.163 mg/L,2.657 mg/L,0.024 mg/L, respectively. The average mass concentrations of iron, manganese, ammonia nitrogen and organic matter after maturity of aeration-contact oxidation filter media are 0.109 mg/L,0.062 mg/L,0.134 mg/L,2.781 mg/L., respectively. The effluent iron, manganese and organic matter treated by oxidation-filtration method can meet the requirements of drinking Water Sanitary Standard (GB5749-2006), ammonia nitrogen can not reach the standard, and the effluent indexes of aeration-contact oxidation process can reach the standard stably. The maximum filtration rate of aeration and contact oxidation is 4 m 路h, the mass concentrations of total iron, total manganese, ammonia nitrogen and CODMn are 0.121 mg / L, 0.034 mg/L,0.434 mg/L,2.170 mg/L, respectively. Aeration-contact oxidation is superior to potassium permanganate pre-oxidation-filtration in the treatment of this kind of water quality. Through the technical and economic analysis and comparison of oxidation-filtration method, oxidation adsorption combination and aeration-contact oxidation method, the aeration-contact oxidation method as a method for the treatment of compound micro-polluted groundwater is determined. The technological process is as follows: spray aeration one stage filtration, falling water aeration, secondary filtration and chlorine dioxide disinfection. The design of the scheme takes the water quality of Liguanbao Water Plant as the target water quality, and the designed water quantity is 50,000 t / d. According to the results of the small scale test and the related pilot test results, the main structures are demonstrated and selected and the parameters are designed. The specific parameters are as follows: two groups of same structures are used in parallel operation, each group is mainly composed of two ordinary fast filters in series, ceramsite is selected as filter material, the height of filter material layer is 1 m in each filter, and the filter speed is set at 2 m 鈮，
本文编号：2476375
[Abstract]:Groundwater is an important drinking water source in China. Due to the infiltration of pollution and excessive exploitation, the quality of groundwater is deteriorating year by year, which makes the water source with only iron and manganese exceeding the standard gradually transformed into a compound micro-polluted water source, and the original treatment technology can not adapt to the deterioration of the water quality. The problem of reaching the standard of compound micro-polluted groundwater needs to be solved urgently. Two conventional water treatment processes, oxidation-filtration and aeration-contact oxidation, were used to treat composite micro-polluted groundwater. The filtration part was designed with the same parameters, and the treatment effects of the two processes were compared and analyzed. The feasible treatment method is selected, and the compound micro-pollution groundwater treatment scheme is determined and designed. The effects of potassium permanganate pre-oxidation-filtration process and aeration-contact oxidation process were investigated and compared under the condition of filter column and filtration speed with the same parameters. The dosage of potassium permanganate was 16.8 mg / L and the pre-oxidation time was 15 min. When the filtration rate is 1 m 路h, the average mass concentrations of iron, manganese, ammonia nitrogen and organic matter treated by oxidation-filtration method are 0.130 mg/L,0.163 mg/L,2.657 mg/L,0.024 mg/L, respectively. The average mass concentrations of iron, manganese, ammonia nitrogen and organic matter after maturity of aeration-contact oxidation filter media are 0.109 mg/L,0.062 mg/L,0.134 mg/L,2.781 mg/L., respectively. The effluent iron, manganese and organic matter treated by oxidation-filtration method can meet the requirements of drinking Water Sanitary Standard (GB5749-2006), ammonia nitrogen can not reach the standard, and the effluent indexes of aeration-contact oxidation process can reach the standard stably. The maximum filtration rate of aeration and contact oxidation is 4 m 路h, the mass concentrations of total iron, total manganese, ammonia nitrogen and CODMn are 0.121 mg / L, 0.034 mg/L,0.434 mg/L,2.170 mg/L, respectively. Aeration-contact oxidation is superior to potassium permanganate pre-oxidation-filtration in the treatment of this kind of water quality. Through the technical and economic analysis and comparison of oxidation-filtration method, oxidation adsorption combination and aeration-contact oxidation method, the aeration-contact oxidation method as a method for the treatment of compound micro-polluted groundwater is determined. The technological process is as follows: spray aeration one stage filtration, falling water aeration, secondary filtration and chlorine dioxide disinfection. The design of the scheme takes the water quality of Liguanbao Water Plant as the target water quality, and the designed water quantity is 50,000 t / d. According to the results of the small scale test and the related pilot test results, the main structures are demonstrated and selected and the parameters are designed. The specific parameters are as follows: two groups of same structures are used in parallel operation, each group is mainly composed of two ordinary fast filters in series, ceramsite is selected as filter material, the height of filter material layer is 1 m in each filter, and the filter speed is set at 2 m 鈮，
本文编号：2476375
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