共查询到19条相似文献,搜索用时 484 毫秒
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海水淡化水由于水质不稳定,直接进入市政公共输配水管网可能引起管垢"溶解",造成水质污染。文中结合碳酸根体系模型、碳酸钙溶度积模型、不同水质水体混合模型及各水质稳定指标模型,研究海水淡化水与地表水掺混的水质稳定性。结果表明,随着掺混倍数的提高,混合水中溶解性无机碳、碱度、钙离子浓度均显著提高。饱和钙离子浓度曲线向pH低值区偏移。RSI指数、缓冲容量μ_(pH)、碳酸钙饱和度缓冲强度μ_S均表明掺混有利于水质稳定和腐蚀控制。 相似文献
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通过对目前应用较为广泛的市政供水管网材料特性的研究,介绍了在管道工程设计施工中,如何对管材的技术性能、施工条件、经济性进行比较,选择适宜的给水管网材料:同时介绍了提高出厂水水质及其生物和化学稳定性;对于水质影响较大的管网,要加快改造步伐;加强管网的日常管理和维护工作。 相似文献
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城市供水管网水质二次污染与防治对策 总被引:9,自引:0,他引:9
防治管网水质二次污染,将优质饮用水安全输送到终端用户,是城市供水的重要环节,也是城镇供水企业急需解决的问题。论文系统分析了城市供水管网水质二次污染的成因,并提出了相应的防治对策。 相似文献
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对2013年南方某城市供水管网各采样点数据进行整理,根据管网的拓扑结构选取其中具有代表性的14个采样点进行水质调查分析,阐明该区管网的水质现状。分析所选用的水质因子为浊度、余氯、p H、耗氧量和菌落总数,并采用Pearson和Spearman相关性分析法进行分析。结果表明不同采样点水样的浊度、p H和耗氧量相差不大,而余氯则与菌落总数呈显著的负相关关系;耗氧量季节性变化最明显,与水温呈显著地负相关关系;管网中水的p H受原水p H影响,呈折线下降趋势;管网末梢与供水交界区域水质稳定性差,需加强监控。 相似文献
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对2013年南方某城市供水管网各采样点数据进行整理,根据管网的拓扑结构选取其中具有代表性的14个采样点进行水质调查分析,阐明该区管网的水质现状。分析所选用的水质因子为浊度、余氯、p H、耗氧量和菌落总数,并采用Pearson和Spearman相关性分析法进行分析。结果表明不同采样点水样的浊度、p H和耗氧量相差不大,而余氯则与菌落总数呈显著的负相关关系;耗氧量季节性变化最明显,与水温呈显著地负相关关系;管网中水的p H受原水p H影响,呈折线下降趋势;管网末梢与供水交界区域水质稳定性差,需加强监控。 相似文献
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文章以广州市中心城区供水管网水质情况监测与评价为例。在广州市中心城区选择具有代表性的监测点进行水质监测。根据布置的监测点水质情况,分析广州市供水管网水质情况,对造成水质下降的原因进行分析,提出相应的改进意见。 相似文献
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通过研究水质化学稳定性随水处理工艺流程的变化,探讨影响水质化学稳定性的因素。结果表明:水处理中碱度消耗工艺(混凝、生物活性炭和臭氧氧化工艺)均使水质化学稳定性下降。生物活性炭滤池运行初期生物膜未形成或尚不成熟时,对水质化学稳定性基本无影响,相反,初期活性炭表面金属溶出还可能改善水质化学稳定性。氯胺消毒基本不影响水质化学稳定性,投加NaClO可提高水质化学稳定性。混凝剂投加后增加水中无机阴离子(SO42-和Cl-),增加水体对管道的腐蚀倾向。 相似文献
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The aim of this study was to assess the physiochemical and microbiological quality of the domestic water through one-year long surveillance in Gaza Strip, Palestine. Water samples were taken from rain-fed cisterns, groundwater from the water network, and desalinated water. For certain chemical parameters, such as nitrate, a high percentage of water samples from all sources exceeded the limits of the Palestinian Standard Institution and the World Health Organization (WHO). Total dissolved solid (TDS) readings were non-compliant for most samples from groundwater and water from rain-fed cisterns, but the TDS quality was far better in desalinated water. As far as microbiological quality is concerned, high percentages of non-compliance were observed for total Coliform and fecal Coliform in most water samples, which was also reflected by the high incidence of water-borne diseases in Gaza Strip. The study reveals a clear superiority of quality for desalinated water, but also the need to adopt better practices (maintenance and pre- and post-treatment) in the desalination plants. 相似文献
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通过模拟试验改进某电厂以弱酸阳离子交换处理出水为补充水源的循环冷却水系统的补水方式和水质稳定剂配方,有效解决了该电厂循环冷却水系统同时存在结垢和腐蚀的问题,同时提高了浓缩倍率、节约了用水量,并使系统金属的腐蚀速率大大下降,有效保护系统设备。 相似文献
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In this paper, an attempt has been made to study a single stage solar desalination system to get a daily yield of 10 1 of potable water. The experimental system consists of a flat plate collector, an evaporator, a single stage vacuum pump and a condenser. The input parameters such as solar irradiance and vacuum pressure in the flash evaporator are varied to find its influence on the performance output viz., system efficiency and yield per day. Efficiency of this plant is found to vary from 15% to 26% for the variation in beam solar radiation from 400 W/m2 to 900 W/m2. A maximum distillate yield of 8.5 1/d is obtained with collector area of 2 m2. The frequency of operation of the vacuum pump and the yield of desalinated water for various beam solar radiations is carried out from which the cost of water is determined. The cost of desalinated water is found to be 0.9 e/l. The desalinated water is tested for various parameters and the results indicate that the quality of water is satisfactory and well below the permissible limits. 相似文献
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浑江作为通化钢铁公司的生产用水水源近年来受到工业废水污染,造成该水厂在冬季运行时,易产生反应池污泥上浮,出水达不到用水标准的问题,通过改变混凝剂的种类,采用新型混凝剂聚合氯化铝铁(PAFC)与聚丙烯酰胺(PAM)配合使用,可以满足用水水质要求,且药剂费用也较低,在最佳实验条件PAFC投加量为30mg/L,PAM投加量为0.1mg/L时,出水浊度可以降到4.1(NTU).结果表明运行中出现的反应池污泥上浮主要是由于水泵夹气现象产生的,可以通过对水泵调节,增加进水水面高度等方法加以解决. 相似文献