混凝联合技术处理昆明市洗车废水的试验研究
发布时间：2019-05-10 03:54
【摘要】：昆明市第三产业发展迅速,尤其是洗车业。随着该行业的不断发展,其用水量和废水量越来越大。洗车废水中含有大量泥沙、洗涤剂等的污染物,直接排入市政管网会加重城市排水设施和污水处理设施的负担。因此,研究洗车废水的处理回用对节约水资源和改善城市水环境具有较大意义。目前昆明市洗车行具有较分散的特点,洗车台废水由排水沟收集汇流进入入沉淀池。对沉淀池的进出水进行连续的水质监测,数据表明昆明市洗车废水中的色度、浊度、COD、LAS这四项指标属于严重污染指标,因此便展开了降低昆明市洗车废水中色度、浊度、COD、LAS浓度的研究,旨在为洗车废水的回用工程实践提供借鉴和参考。本研究主要包含的内容有：①单一混凝剂、复合混凝剂处理洗车废水的效果及其二者的优劣；②粉末活性炭(PAC)处理洗车废水的最佳工况,并对其吸附机理进行初步分析；③粉末活性炭和混凝剂组合的处理情况及组合的最佳方式；④双氧水的引进对③中处理方式的影响,并确定双氧水的影响因素；⑤采用不同组合方式处理洗车废水,明确各种方式的优劣；⑥在"H2O2+Al2(SO4)3-PFS+PAC"工艺基础上增加过滤工艺,研究该工艺的处理效果,并对过滤的滤速和滤层厚度对污染物去除影响进行研究。研究结果表明：通过大量资料的比对分析所筛选出的混凝剂在最合适投加量下对浊度的去除效果较好,Al2(SO4)3投加340mg/L时,浊度的去除率为99-11%；PFS的投加260mg/L时,浊度的去除率为99.00%;Al2(SO4)3-PFS以质量比为1：3混合使用,投加280mg/L,对浊度的去除率达到99.27%。对COD和LAS的去除率而言,A12(S04)3-PFS比A12(S04)3分别约高8%和9%,比PFS分别约高3%和3%。②PAC投加量为1.6g/L,吸附45min时,COD的去除率达到70%以上,LAS的去除率达到85%以上。PAC对洗车废水中还原性类物质(COD)吸附符合Freundlich吸附等温模型,对洗涤剂类物质(LAS)吸附符合Langmuir等温吸附模型。②PAC和混凝组合使用,PAC于混凝之后60s投加可以获得较好的处理效果。④投加双氧水对洗车废水中COD的去除起到了一定的促进作用,但LAS的去除几乎不受影响。当H202于混凝之前投加,且投药量为5 mg/L时,COD能够获得最优的处理效果。⑤PAC、Al2(SO4)3-PFS、PAC+Al2(SO4)3-PFS、H2O2+Al2(SO4)3-PFS+PAC这四种工艺对COD、LAS的去除效果存在较大的差异。四种工艺处理洗车废水处理的效果由优到劣依次为H2O2+Al2(SO4)3-PFS+PAC PAC+Al2(SO4)3-PFSPACAl2(S04)3-PFS。⑥在“H2O2+A12(SO4)3-PFS+PAC"的工艺上增加过滤工艺,滤后水中COD、LAS、色度、浊度指标值分别为22mg/L、0.47 mg/L、3倍、2.3NTU,达到了回用水水质标准(《生活杂用水水质标准》GJ25.1-89),不同滤速下和不同滤料层厚度下对LAS的去除效果有一定的影响。本课题通过室内试验研究,采用'H2O2+A12(SO4)3-PFS+PAC过滤”的工艺很大程度上降低COD、LAS、色度、浊度这四项指标的浓度,出水水质达到了回用水的标准,为工程实践提供了参考和借鉴。
[Abstract]:The tertiary industry in Kunming is developing rapidly, especially the car washing industry. With the development of the industry, the amount of water and waste water is increasing. The car-washing wastewater contains a large amount of pollutants such as silt, detergent and the like, and is directly discharged into the municipal pipe network to increase the burden of the urban drainage facilities and the sewage treatment facilities. Therefore, it is of great significance to study the treatment and reuse of car-washing wastewater to save water resources and improve the urban water environment. At present, the washing line in Kunming has the characteristics of more dispersion, and the wastewater of the car wash station is collected and collected by the drainage ditch into the sedimentation tank. The continuous water quality monitoring of the inlet and outlet water of the sedimentation tank indicates that the four indexes of the color, the turbidity, the COD and the LAS in the car-washing wastewater in Kunming are serious pollution indexes, so the research on the color, the turbidity, the COD and the LAS concentration in the washing wastewater of the Kunming city is expanded, The purpose of this paper is to provide reference and reference for the practice of the recycling of car-washing wastewater. The main contents of this study are as follows: the effect of a single coagulant and a compound coagulant in the treatment of car-washing wastewater and the advantages and disadvantages of the two; the best working condition of the activated carbon (PAC) to treat the car-washing wastewater and the preliminary analysis of its adsorption mechanism; The treatment of the combination of the activated carbon and the coagulant and the best mode of the combination are as follows: the influence of the introduction of hydrogen peroxide on the treatment method in the wastewater and the influencing factors of the hydrogen peroxide are determined; the wastewater of the car washing is treated by different combination methods, and the advantages and disadvantages of various manners are clear; The treatment effect of the process is studied by increasing the filtration process on the basis of the "H2O2+Al2(SO4)3-PFS+PAC" process, and the effect of the filtration rate and the thickness of the filter layer on the removal of the pollutants is studied. The results show that the removal rate of turbidity is 99-11% when adding 340 mg/ L of Al2 (SO4)3, the removal rate of turbidity is 99.00%, and the 3-PFS of Al2 (SO4)3-PFS is used in a mass ratio of 1:3. The removal rate of turbidity was 99.27% with the addition of 280 mg/ L. For COD and LAS removal rates, A12 (S04)3-PFS was about 8% and 9% higher than that of A12 (S04)3, respectively, and about 3% and 3% higher than PFS, respectively. And the removal rate of the LAS reaches more than 70%, and the removal rate of the LAS reaches more than 85%. The adsorption of the reducing substances (COD) in the car-washing wastewater by the PAC is in accordance with the Freundlich adsorption isotherm model, and the adsorption of the detergent substances (LAS) is in accordance with the Langmuir isotherm adsorption model. And the PAC and the coagulation combination are used, and a good treatment effect can be obtained after the PAC is added into the 60s after the coagulation. The removal of COD in the car-washing wastewater by the hydrogen peroxide and the hydrogen peroxide has a certain catalytic effect, but the removal of LAS is almost unaffected. When the H202 is added before coagulation, and the dosage of the H202 is 5 mg/ L, the optimal treatment effect can be obtained by the COD. There were significant differences in the removal of COD and LAS in the four processes including PAC, Al2 (SO4)3-PFS, PAC + Al2 (SO4)3-PFS, H2O2 + Al2 (SO4)3-PFS + PAC. The effect of four processes on the treatment of car-washing wastewater was as follows: H2O2 + Al2 (SO4)3-PFS + PAC PAC + Al2 (SO4)3-PFSPACA12 (S04)3-PFS. In the process of "H2O2+A12(SO4)3-PFS+PAC", the filtration process is increased, and the COD, LAS, chroma and turbidity index value in the filtered water are 22 mg/ L, 0.47 mg/ L,3 times, and 2.3 NTU, respectively, and the water quality standard for water return is achieved (the standard for water quality of water for domestic water use> GJ25.1-89). The effect of the different filtering speed and the thickness of different filter materials has a certain effect on the removal effect of LAS. In this paper, the process of "H2O2 + A12 (SO4)3-PFS + PAC filtration" is used to reduce the concentration of COD, LAS, chromaticity and turbidity, and the water quality of effluent reaches the standard of water return, and provides reference for engineering practice.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X799
本文编号：2473321
[Abstract]:The tertiary industry in Kunming is developing rapidly, especially the car washing industry. With the development of the industry, the amount of water and waste water is increasing. The car-washing wastewater contains a large amount of pollutants such as silt, detergent and the like, and is directly discharged into the municipal pipe network to increase the burden of the urban drainage facilities and the sewage treatment facilities. Therefore, it is of great significance to study the treatment and reuse of car-washing wastewater to save water resources and improve the urban water environment. At present, the washing line in Kunming has the characteristics of more dispersion, and the wastewater of the car wash station is collected and collected by the drainage ditch into the sedimentation tank. The continuous water quality monitoring of the inlet and outlet water of the sedimentation tank indicates that the four indexes of the color, the turbidity, the COD and the LAS in the car-washing wastewater in Kunming are serious pollution indexes, so the research on the color, the turbidity, the COD and the LAS concentration in the washing wastewater of the Kunming city is expanded, The purpose of this paper is to provide reference and reference for the practice of the recycling of car-washing wastewater. The main contents of this study are as follows: the effect of a single coagulant and a compound coagulant in the treatment of car-washing wastewater and the advantages and disadvantages of the two; the best working condition of the activated carbon (PAC) to treat the car-washing wastewater and the preliminary analysis of its adsorption mechanism; The treatment of the combination of the activated carbon and the coagulant and the best mode of the combination are as follows: the influence of the introduction of hydrogen peroxide on the treatment method in the wastewater and the influencing factors of the hydrogen peroxide are determined; the wastewater of the car washing is treated by different combination methods, and the advantages and disadvantages of various manners are clear; The treatment effect of the process is studied by increasing the filtration process on the basis of the "H2O2+Al2(SO4)3-PFS+PAC" process, and the effect of the filtration rate and the thickness of the filter layer on the removal of the pollutants is studied. The results show that the removal rate of turbidity is 99-11% when adding 340 mg/ L of Al2 (SO4)3, the removal rate of turbidity is 99.00%, and the 3-PFS of Al2 (SO4)3-PFS is used in a mass ratio of 1:3. The removal rate of turbidity was 99.27% with the addition of 280 mg/ L. For COD and LAS removal rates, A12 (S04)3-PFS was about 8% and 9% higher than that of A12 (S04)3, respectively, and about 3% and 3% higher than PFS, respectively. And the removal rate of the LAS reaches more than 70%, and the removal rate of the LAS reaches more than 85%. The adsorption of the reducing substances (COD) in the car-washing wastewater by the PAC is in accordance with the Freundlich adsorption isotherm model, and the adsorption of the detergent substances (LAS) is in accordance with the Langmuir isotherm adsorption model. And the PAC and the coagulation combination are used, and a good treatment effect can be obtained after the PAC is added into the 60s after the coagulation. The removal of COD in the car-washing wastewater by the hydrogen peroxide and the hydrogen peroxide has a certain catalytic effect, but the removal of LAS is almost unaffected. When the H202 is added before coagulation, and the dosage of the H202 is 5 mg/ L, the optimal treatment effect can be obtained by the COD. There were significant differences in the removal of COD and LAS in the four processes including PAC, Al2 (SO4)3-PFS, PAC + Al2 (SO4)3-PFS, H2O2 + Al2 (SO4)3-PFS + PAC. The effect of four processes on the treatment of car-washing wastewater was as follows: H2O2 + Al2 (SO4)3-PFS + PAC PAC + Al2 (SO4)3-PFSPACA12 (S04)3-PFS. In the process of "H2O2+A12(SO4)3-PFS+PAC", the filtration process is increased, and the COD, LAS, chroma and turbidity index value in the filtered water are 22 mg/ L, 0.47 mg/ L,3 times, and 2.3 NTU, respectively, and the water quality standard for water return is achieved (the standard for water quality of water for domestic water use> GJ25.1-89). The effect of the different filtering speed and the thickness of different filter materials has a certain effect on the removal effect of LAS. In this paper, the process of "H2O2 + A12 (SO4)3-PFS + PAC filtration" is used to reduce the concentration of COD, LAS, chromaticity and turbidity, and the water quality of effluent reaches the standard of water return, and provides reference for engineering practice.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X799
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