南水北调山东受水区老旧管网水质稳定性控制的中试研究
发布时间：2018-12-29 21:22
【摘要】：本文以南水北调水作为主要实验用水,在多水源供水条件下,研究济宁和东营地区老旧管网铁释放的过程,研究的主要内容如下:(1)对济宁和东营两地老旧管网管垢进行微观形态分析和成分分析;(2)针对南水北调水质特性,建立适合的水质化学稳定性判定体系,对南水北调水水质化学稳定性进行评估;(3)研究不同水质条件(不同水源切换、氯离子、硫酸根)对济宁和东营老旧管网铁释放的影响;(4)针对水源切换后,济宁地区老旧管网出水铁超标现象,开展多水源供水情况下铁释放控制性研究。本文的主要研究结果如下:1、通过管网管垢的电镜扫描分析,元素能谱图分析,物质衍射分析,得出管垢主要成分为铁的氧化物,东营地区管网管垢主要成分为Fe3O4(磁铁矿)、α-Fe O(OH)(针铁矿)和CaCO3(石灰石),而济宁地区管垢检测出较多的γ-FeO(OH)(纤铁矿),究其原因,是由两地不同水质、水力条件导致。2、针对南水北调水质特点,选取Langelier饱和指数、CCPP碳酸钙沉淀势以及拉森比率三个判定指数,对水质化学稳定性进行综合评价,水体为结垢性水质,拉森比率较高,管网应对南水北调水切换时,容易发生“黄水”现象。3、济宁和东营地区老旧管网铁释放受进水硫酸根和氯离子浓度的影响较大,随着进水硫酸根离子浓度和氯离子浓度增大,管网铁释放不断增大;通过对南水北调水进行水源切换,运行至出水稳定时,东营地区管网出水总铁量0.27 mg/L,浊度0.87 NTU,满足生活饮用水卫生标准限值,济宁地区管网出水总铁为0.45 mg/L,浊度为1.49 NTU,均超过生活饮用水卫生标准限值。4、研究表明,不同水源掺混可有效控制济宁地区管网铁释放,增加济宁地下水比例,当济宁地下水与南水北调水掺混比例达到1:1时,管网出水总铁和浊度均达标;通过投加NaHCO3药剂调节进水碱度,当进水碱度达到340 mg/L时,管网出水总铁满足限值要求;通过投加Na2HPO3缓蚀剂,当进水磷酸根离子浓度达到2 mg/L,可有效控制管网铁释放;通过增加进水余氯量,当余氯值到达0.5 mg/L左右时,管网铁释放逐渐减少,随着进水余氯值不断增加,管网铁释放现象不再缓解,因此增加余氯量,不能有效控制出水浊度和铁释放量。
[Abstract]:In this paper, the process of iron release from old pipe network in Jining and Dongying areas is studied under the condition of multi-source water supply with South-to-North water transfer water as the main experimental water. The main contents of the study are as follows: (1) the microscopic morphology and composition analysis of the old network pipe scale in Jining and Dongying; (2) according to the water quality characteristics of South-to-North Water diversion Project, a suitable system for judging the chemical stability of water quality is established, and the chemical stability of South-to-North Water diversion Water quality is evaluated. (3) to study the effect of different water quality conditions (different water source switching, chloride ion, sulfate radical) on iron release from old pipe networks in Jining and Dongying; (4) aiming at the phenomenon that the effluent iron of the old pipe network in Jining area exceeded the standard after the water source switch, the control study of iron release was carried out under the condition of multi-source water supply. The main results of this paper are as follows: 1. Through the electron microscope scanning analysis, element energy spectrum analysis and material diffraction analysis, it is concluded that the main composition of the tube scale is the oxide of iron. The main components of pipe network scale in Dongying area are Fe3O4 (magnetite), 伪-Fe O (OH) (goethite (伪-Fe O (OH) (goethite) and CaCO3 (limestone), while more 纬-FeO (OH) (fiberite is detected in Jining area. It is caused by different water quality and hydraulic conditions in both places. According to the characteristics of water quality of South-to-North Water transfer, three judgement indexes, Langelier saturation index, CCPP calcium carbonate precipitation potential and Larson ratio, are selected to evaluate the chemical stability of water quality. The water is scale quality and Larsen ratio is high. Yellow water is easy to occur when the pipe network should switch water from south to north. 3. The iron release of the old pipe network in Jining and Dongying areas is influenced by the concentration of sulfate and chloride ion in the influent. With the increase of sulphate ion concentration and chloride ion concentration, the iron release from the pipe network increases. By switching the source of water from south to north water transfer, when the effluent is stable, the total iron content in Dongying area reaches 0.27 mg/L, turbidity of 0.87 NTU, meets the sanitary limit of drinking water. The total effluent iron of Jining area is 0. 45 mg/L, and turbidity is 1. 49 NTU,. 4. The study shows that mixing different water sources can effectively control iron release in Jining area. When the ratio of Jining groundwater and South-to-North Water transfer reaches 1:1, the total iron and turbidity of the effluent reach the standard. When the influent alkalinity is adjusted by adding NaHCO3 reagent, when the influent alkalinity reaches 340 mg/L, the total iron in the effluent meets the limit requirement, and the iron release can be effectively controlled by adding Na2HPO3 inhibitor when the influent concentration of phosphate ion reaches 2 mg/L,. By increasing the amount of residual chlorine in the influent, when the residual chlorine value reaches about 0.5 mg/L, the iron release decreases gradually. With the increase of the residual chlorine value of the influent, the phenomenon of iron release in the pipe network is no longer alleviated, so the residual chlorine content is increased. Water turbidity and iron release can not be effectively controlled.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU991
[Abstract]:In this paper, the process of iron release from old pipe network in Jining and Dongying areas is studied under the condition of multi-source water supply with South-to-North water transfer water as the main experimental water. The main contents of the study are as follows: (1) the microscopic morphology and composition analysis of the old network pipe scale in Jining and Dongying; (2) according to the water quality characteristics of South-to-North Water diversion Project, a suitable system for judging the chemical stability of water quality is established, and the chemical stability of South-to-North Water diversion Water quality is evaluated. (3) to study the effect of different water quality conditions (different water source switching, chloride ion, sulfate radical) on iron release from old pipe networks in Jining and Dongying; (4) aiming at the phenomenon that the effluent iron of the old pipe network in Jining area exceeded the standard after the water source switch, the control study of iron release was carried out under the condition of multi-source water supply. The main results of this paper are as follows: 1. Through the electron microscope scanning analysis, element energy spectrum analysis and material diffraction analysis, it is concluded that the main composition of the tube scale is the oxide of iron. The main components of pipe network scale in Dongying area are Fe3O4 (magnetite), 伪-Fe O (OH) (goethite (伪-Fe O (OH) (goethite) and CaCO3 (limestone), while more 纬-FeO (OH) (fiberite is detected in Jining area. It is caused by different water quality and hydraulic conditions in both places. According to the characteristics of water quality of South-to-North Water transfer, three judgement indexes, Langelier saturation index, CCPP calcium carbonate precipitation potential and Larson ratio, are selected to evaluate the chemical stability of water quality. The water is scale quality and Larsen ratio is high. Yellow water is easy to occur when the pipe network should switch water from south to north. 3. The iron release of the old pipe network in Jining and Dongying areas is influenced by the concentration of sulfate and chloride ion in the influent. With the increase of sulphate ion concentration and chloride ion concentration, the iron release from the pipe network increases. By switching the source of water from south to north water transfer, when the effluent is stable, the total iron content in Dongying area reaches 0.27 mg/L, turbidity of 0.87 NTU, meets the sanitary limit of drinking water. The total effluent iron of Jining area is 0. 45 mg/L, and turbidity is 1. 49 NTU,. 4. The study shows that mixing different water sources can effectively control iron release in Jining area. When the ratio of Jining groundwater and South-to-North Water transfer reaches 1:1, the total iron and turbidity of the effluent reach the standard. When the influent alkalinity is adjusted by adding NaHCO3 reagent, when the influent alkalinity reaches 340 mg/L, the total iron in the effluent meets the limit requirement, and the iron release can be effectively controlled by adding Na2HPO3 inhibitor when the influent concentration of phosphate ion reaches 2 mg/L,. By increasing the amount of residual chlorine in the influent, when the residual chlorine value reaches about 0.5 mg/L, the iron release decreases gradually. With the increase of the residual chlorine value of the influent, the phenomenon of iron release in the pipe network is no longer alleviated, so the residual chlorine content is increased. Water turbidity and iron release can not be effectively controlled.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU991
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