塘沽市政用水水质控制稳定性研究

发布时间：2018-07-06 08:43

本文选题：塘沽市政源水 + MIEX　；参考：《天津科技大学》2015年硕士论文

【摘要】：市政源水中有机物浓度随季节变化对水质影响显著,有机物的有效去除是保证市政源水水质的关键。海水淡化水是缓解淡水资源短缺的有效方法。由于海水淡化水的化学稳定性较差,对现有的市政旧铸铁管网存在一定侵蚀性和腐蚀性,因此如何结合天津市塘沽市政源水的季节性水质特性,研究海水淡化水与市政源水混配的稳定性问题,对于实现利用旧市政管网输送海水淡化水及保证市政供水的稳定性具有重要意义。本文研究了树脂吸附的方法去除塘沽市政源水中有机物的机理及工艺,确定了提高海水淡化水化学稳定性的措施及技术参数。首先,针对不同季节的天津市塘沽市政源水,研究了磁性离子交换树脂(MIEX)对市政源水中有机物的吸附处理工艺,确定了处理不同季节市政源水MIEX最佳投加量(春、夏、秋、冬季分别为6mL/L、8mL/L、8mL/L、8mL/L)及最佳吸附时间(30min)。结果表明：MIEX具有良好的再生性能,MIEX吸附有机物的过程可由Freundlich模型及准二级动力学方程描述,吸附过程为放热过程。与常规混凝工艺相比,MIEX与混凝工艺联用能够提高CODMn去除率(约为45%)。MIEX对于去除市政源水中有机物效果显著。其次,研究了海水淡化水与塘沽市政供水的混配工艺,考察了混配比、pH、搅拌速率对混配水水质稳定性的影响。采用正交试验方法优化了海水淡化水与不同季节塘沽市政源水最佳混配工艺参数为：海水淡化水与春季市政源水混配体积比为1：2.5,pH为8.2,搅拌速率为100r/min:海水淡化水与夏季市政源水混配体积比为1：2.5,pH为8.2,搅拌速率为100r/min；海水淡化水与秋季市政源水混配体积比为1：2.5,pH为8.4,搅拌速率为100e/min；海水淡化水与冬季市政源水混配体积比为1：2,pH为8.4,搅拌速率为100r/min。经混配工艺处理海水淡化水LSI由-5.11提高到0.5,IL由2.16降低到1.0,海水淡化水化学稳定性明显提高。最后,探讨了现有市政旧管网对市政用水水质稳定性的影响。采用管龄约为20年的塘沽市政铸铁旧管道,考察了连续运行条件下海水淡化水、自来水、混配水对现有市政旧管网的腐蚀性,考察了水体中总铁浓度、硬度、浊度和色度的变化规律。研究结果表明：海水淡化水对现有市政旧管网具有较强的腐蚀性。在循环运行72h后,海水淡化水中总铁浓度由0提高至0.27gg/mL,通过对海水淡化水进行混配处理,混配水中总铁浓度由0.05μg/mL提高至0.20μg/mL,混配工艺能够有效降低海水淡化水对市政铸铁旧管道的腐蚀性。
[Abstract]:The concentration of organic matter in municipal source water has a significant influence on water quality with seasonal variation. The effective removal of organic matter is the key to ensure the water quality of municipal source water. Seawater desalination is an effective method to alleviate the shortage of fresh water resources. Because of the poor chemical stability of desalination water and the corrosion and corrosion of the existing municipal iron cast pipe network, how to combine the seasonal water quality characteristics of Tianjin Tanggu municipal water source water, It is of great significance to study the stability of the mixture of desalination water and municipal source water, which is of great significance to realize the transportation of desalination water by using the old municipal pipe network and to ensure the stability of municipal water supply. In this paper, the mechanism and process of removing organic matter from Tanggu municipal source water by resin adsorption method are studied, and the measures and technical parameters to improve the chemical stability of desalination water are determined. Firstly, the adsorption process of magnetic ion exchange resin (miex) on organic matter in municipal source water was studied for Tanggu municipal water in different seasons, and the optimum dosage of miex (spring, summer and autumn) was determined. In winter, it is 6 mL / L / L ~ (8) mL / L ~ (8) mL / L ~ (-1) and the best adsorption time (30min) is 8 mL / L ~ (-1) / L ~ (-1) / L ~ (-1), respectively. The results show that the process of adsorption of organic matter by miex with good regeneration performance can be described by Freundlich model and quasi-second-order kinetic equation, and the adsorption process is exothermic. Compared with the conventional coagulation process, the combined use of miex and coagulation process can improve the removal rate of COD _ (mn) (about 45%). Miex has a remarkable effect on the removal of organic matter in municipal source water. Secondly, the mixing process of seawater desalination water and Tanggu municipal water supply was studied, and the effects of mixing ratio (pH) and mixing rate on the stability of mixed water quality were investigated. The optimum mixing process parameters of desalination water and Tanggu municipal source water in different seasons were optimized by orthogonal test. The volume ratio of desalination water to municipal water in spring was 1: 2. 5 and pH was 8. 2, and the mixing rate was 100 r / min: seawater desalination. The mixed volume ratio of water to municipal source water in summer is 1: 2.5, pH is 8.2, and the mixing rate is 100 r / min. The volume ratio of seawater desalination water to municipal source water in autumn is 1: 2.5, pH is 8.4, the mixing rate is 100 e/ min, and the volume ratio of desalinated water to municipal water in winter is 1: 2, pH is 8.4, and the mixing rate is 100 r / min. The LSI of seawater desalination water was increased from -5.11 to 0.5 L IL from 2.16 to 1.0, and the chemical stability of seawater desalination water was improved obviously. Finally, the influence of the old municipal pipe network on the stability of municipal water quality is discussed. The corrosion of seawater desalinated water, tap water and mixed water on the existing municipal old pipe network under continuous operation condition was investigated by using Tanggu municipal cast iron pipeline with the age of about 20 years. The total iron concentration and hardness in the water body were also investigated. The change of turbidity and chromaticity. The results show that seawater desalination has a strong corrosive effect on the old municipal pipe network. After 72 hours of cycle operation, the total iron concentration in seawater desalination water increased from 0 to 0.27 g / mL. The total iron concentration in mixed water was increased from 0.05 渭 g / mL to 0.20 渭 g / mL. The mixing process can effectively reduce the corrosion of desalination water to municipal cast iron pipes.
【学位授予单位】：天津科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU991.2

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