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茶多酚作为饮用水辅助消毒剂的试验研究 总被引:2,自引:0,他引:2
辅助消毒剂是指为防止供水管道内部及管壁有微生物大量滋生与繁殖,保证城市水厂出厂水到达管网末梢时仍满足生活饮用水卫生标准中微生物学指标的要求,而在出厂水中投加的消毒剂。氯有持续消毒效果,水厂通常以氯作为辅助消毒剂。茶多酚为绿色植物制剂,对饮用水具有消毒作用,可探索将其作为辅助消毒剂,以减少氯消毒副产物的产生。试验表明茶多酚作为辅助消毒剂有较强的消毒持续性,不影响出水色度指标,茶多酚作为辅助消毒剂的适宜投加量为3mg/L,茶多酚辅助消毒的药剂成本为0.30元/m~3。 相似文献
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《Planning》2013,(3)
目的调查某企业生活饮用水中硫化物污染原因,为政府预防控制提供科学依据。方法采用现场卫生学调查与实验室检测相结合的方法。结果饮用水中硫化物含量平均值水源水为8.25 mg/L、末梢水为7.78 mg/L,末梢水超过《生活饮用水卫生标准》(GB 5749-2006)规定限值(0.02 mg/L)的389倍,硫化物严重超标。结论在饮用水源地非法建设污染企业,破坏水源地植被,废水、废碴、废气等"三废"物质未经处理直接排放是导致硫化物污染水源的主要原因。要确保企业自备饮用水安全,必须重视水源地的保护。 相似文献
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《Planning》2016,(1)
目的通过在线监测数据,描述北京市2014年生活饮用水水质总体情况,分析各地区水质、水厂及供水管网特点,为卫生监督部门制定监管方案、优化在线监测系统提供参考。方法收集2013年12—2014年10月北京市不同区域7个市政水厂附近在线监测点的管网末梢水监测数据,整理为日平均值后进行统计分析,从数据有效性、月均值、日均值、地区差异等角度,对pH、浑浊度、余氯、电导率和总有机碳(TOC)五项指标进行综合分析比较。结果经统计学分析,各监测点的五项指标数据有效,日均值均有统计学差异。丰台区、大兴区的监测点位于南水北调水源地切换点,电导率变化趋势与水源切换时间相符。结论北京市城区市政管网供水监测点水质监测指标符合标准要求,市政水厂及供水管线中全年水质波动平稳。在线监测系统稳定性较好,通过各参数的实时监测能从一定程度上反映管网中水质变化,可进一步完善综合分析能力,普及推广。 相似文献
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近些年的研究表明:当水厂出水中含有一定量的有机物时,细菌将附着于管网管壁生长形成生物膜,导致管网腐蚀和结垢降低管网的输水能力,继而导致二级泵站动力消耗增加,并会导致用户水质恶化,色度和浊度上升;生物膜与管网水中病源微生物会对饮用者的健康造成直接的威胁,即这类出水的生物稳定性较差。目前,国际上大都采用测定AOC(Assimilable organic carbon)即可同化有机碳来判定饮用水的生物稳定性。本文将针对近些年来针对AOC的研究成果进行论述。 相似文献
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《中国给水排水》2015,(6)
北京第十水厂A厂是北京市采用BOT方式建设的大型供水设施,设计规模为50×104m3/d,最初水源定为北京密云水库。随着近年来北京社会经济的发展,水源条件和水质标准都发生了巨大变化。第十水厂新的水源确定为密云水库和南水北调双水源,要求能够实现本地水源和外地水源的联合调度运行,出厂水水质符合《生活饮用水卫生标准》(GB 5749—2006)。根据双水源特征以及水质风险分析,第十水厂以确保水质、优势互补、运行方便、经济合理的原则对水处理工艺重新进行了设计,采取了长流程、多屏障的工艺处理流程,在混凝沉淀、臭氧气源和紫外-氯胺联合消毒等技术选择上进行了技术经济分析。 相似文献
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北京第十水厂A厂是北京市采用BOT方式建设的大型供水设施,设计规模50万m3/d,最初水源定为北京密云水库。随着近年来北京社会经济的发展,水源条件和水质标准都发生了巨大变化。第十水厂新的水源确定为密云水库和南水北调双水源,要求能够实现本地水源和外地水源的联合调度运行,出厂水要符合新的《生活饮用水卫生标准》。根据双水源特征以及水质风险分析,以确保水质,优势互补,运行方便,经济合理为原则,对第十水厂水处理工艺重新进行了设计,采取了多屏障的工艺处理流程,并选择应用了整体滤板,压块破碎炭和紫外-氯胺联合消毒等新技术。 相似文献
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《Planning》2013,(5)
目的为农村改水摸底调查提供基础数据,对改水工程做出决策提供参考依据。方法全自治区按分层抽样方法选38个县作为监测对象,约78%的农村人口饮用集中式水厂的供水。按照《生活饮用水标准检验方法》(GB/T 5750–2006),对水样的17项指标进行检验。结果影响农村生活饮用水水质的主要因素是细菌污染及硫酸盐、氯化物、总硬度超标。结论农村水厂管网末梢水水质综合指标合格率较低,主要是水厂处理工艺不够完善,消毒不够规范等所致。加强对农村安全饮水工程的卫生学评价与全过程的质量验收,依设计要求完善水处理设施并加强运行管理。 相似文献
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Regulations governing the quality of drinking water within the European Community must be based on Directive 80/778/EC, although Member States may impose tighter or additional limits if they so wish. The Directive is substantially derived from standards set by the World Health Organisation (WHO) in 1970. Revised 'Guidelines Values'for water contaminants were issued by WHO in 1984, and a further revision will be published in 1993. Modest changes in the guidelines set by WHO for microbiological parameters since 1970 have been accompanied by a large increase in the number of limits set for chemical parameters. This is particularly marked for organic compounds including pesticides and disinfection byproducts. The new WHO guidelines will inevitably have an impact on water supplies in the UK, but the timescale for a significant change in the outmoded EC Directive is uncertain. 相似文献
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介绍了国际上通行的制订饮用水源水水质标准的方法和步骤,以及在选择源水水质评价指标和确定标准值时采用的原则.在此基础上,分析了目前我国在饮用水源水水质评价工作中存在的问题,提出从研究典型饮用水源地的源水水质入手,使制订出的标准既符合我国国情,又具有较强的可操作性. 相似文献
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J. K. FAWELL BSc CBiol Dip RCPath D. G. MILLER BSc PhD CEng MIChemE 《Water and Environment Journal》1992,6(2):726-732
Public understanding of water quality is obtained primarily from the extensive media coverage of problems. This has contributed to a distrust of the water supply industry and of specific experts in this field. It is therefore important that the basis of standards for both microbiological and chemical parameters is absoulutely clear and scientifically defensible, since these are the yardsticks against which quality and safety will be judged. They are also the reference point from which political decisions on standards must be made.
It is also important that the public is given some understanding of the comparative risks involved and that a proper balance is struck between maintaining microbiological quality and achieving chemical standards, particularly for disinfection by-products. Without this, the demand for more stringent standards in a search for absolute safety will result in more costly water, while standards approach the unachievable. 相似文献
It is also important that the public is given some understanding of the comparative risks involved and that a proper balance is struck between maintaining microbiological quality and achieving chemical standards, particularly for disinfection by-products. Without this, the demand for more stringent standards in a search for absolute safety will result in more costly water, while standards approach the unachievable. 相似文献
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分析了发展直饮水的必要性,从水处理工艺、用水量确定、管道系统设计、供水管材的选择等方面介绍了直饮水系统的设计方法。指出了发展直饮水应该因地制宜地选择最佳方案,并应加强对供水企业的管理。 相似文献
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自来水用户用水模式的确定方法研究 总被引:2,自引:2,他引:0
针对管网建模过程中用水量变化规律的复杂性,提出了根据实际用水量数据进行聚类分析,合理地对用户进行分类的方法,并通过主成分综合模型确定了每一类用户典型的用水模式曲线.该方法借助电磁水表实时远传的水量数据,能够及时更新用户的用水模式曲线,为提高建模的精确性打下了坚实的基础. 相似文献
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北区水厂净水工艺改造选用高密度澄清池DENSADEG、气水反冲洗滤池工艺,实际运行效果优于设计要求。 相似文献
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C. R. Hayes BSc MSc CBiol A. J. Bates PhD MRSC CChem A. H. Goodman BSc MRSC J. P. Vinson BSc T. P. Sadler MSc DMS CIEH 《Water and Environment Journal》1997,11(4):257-263
During the last twenty years, the UK has made steady progress in the understanding of the 'lead in drinking water'issue and towards compliance with a lead standard which is more stringent than elsewhere in Europe.
Evaluating the needs for corrective action has not been straightforward because of the difficulties in characterizing the pick-up of lead from lead pipes throughout whole water supply zones. Survey methods have developed over the past twenty years as the behaviour of lead pipes has become better understood, but some ambiguities may still need to be addressed.
Information from Bristol Water suggests that compliance with a new lead standard of 10 μg/1 may be feasible by corrective water treatment in some zones, based on the already accepted practice of dosing with phosphoric acid, depending on how this more stringent standard is implemented. This view is also held by Anglian Water, based on their extensive experience with phosphoric acid dosing (without any significant problems) since the mid-1980s. Therefore total lead pipe replacement, at substantially higher cost, can likely be avoided in many zones. 相似文献
Evaluating the needs for corrective action has not been straightforward because of the difficulties in characterizing the pick-up of lead from lead pipes throughout whole water supply zones. Survey methods have developed over the past twenty years as the behaviour of lead pipes has become better understood, but some ambiguities may still need to be addressed.
Information from Bristol Water suggests that compliance with a new lead standard of 10 μg/1 may be feasible by corrective water treatment in some zones, based on the already accepted practice of dosing with phosphoric acid, depending on how this more stringent standard is implemented. This view is also held by Anglian Water, based on their extensive experience with phosphoric acid dosing (without any significant problems) since the mid-1980s. Therefore total lead pipe replacement, at substantially higher cost, can likely be avoided in many zones. 相似文献
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从饮用水安全问题出发,介绍了我国生活饮用水水质标准的现状,剖析和比较了《城市供水水质标准》和《生活饮用水卫生标准》的特点,对检测项目、检测方法和指标值等方面的变革做了分析,同时与国外饮用水水质标准进行了比较,并提出了实施新水质标准存在的问题及建议。 相似文献