专业英语PPTUnit13

1、、供水、团队成员：整体供水需求on a municipal供水系统is the sum of all the individual demands during a stated period。城市供水系统对水的总需求是一段时间内个人水的总和。water quality requirements、water demand、water demand in a partictular community is normally specified in terms of average daily demaily社区对水的平均日需求=一年总水需求/365天单位m3/d、百万加仑日、it is of

2、fen consenience to express the rate of demand per person 3360 average daily demandthe units here may be litters per son per day or gallons per person per day。人均水需求也很好地描述了：天的平均每日水需求=社区平均每日水需求/年度社区数量。这个单位是人均/日/升或人均/日/加仑。the demands on a water system vary not only from year to year and from season，but

3、also from day to day and hour to hour。水的需求每年，每个季节，甚至每天都不同。fluctuations in water use、water quality standards、water contains a variety of chemical、physical、and biological subsances水中含有各种融化或漂浮的化学、物理和生物物质。water is evaluated for quality in terms of its physical、chemical、and micro biographical properties

4、. it is necessary that the tests水质评价包括物理、化学、微生物学特性。这种标准对分析上述特性很重要，分析结果被公众认可，因此与水质标准比较非常重要。tasks、odors、color、and turbidty are controlled in public water supplies partly because they make drinking water un pallatable公共供水控制水的味道、气味、颜色和浊度。这些因素不仅会使水变质，还会严格控制水的各个方面，因为饮料、食品加工和纺织品中的水使用。physical characteristi

5、cs，the many chemical compounds dissolve in water may be of nature or industrial origin and may be beneficial or harm ficial许多溶于水的化合物可能是自然的、工业的来源，也可能有益或有害，具体取决于它们的组成和浓度。chemical character istics、synth eic organic compounds、like ddt、which are products or byp products of chemicals used in agricultults、

6、southrses of water、the quality and quanlity of water from surface water and ground water、the two main sourses、are influenced by地表水和地下水(两个主要来源)的水质和数量受地理、气候和人类活动的影响。ground water is water that has percolated downward from the ground surface through the soil pores。there is growing concern that vast stre

7、tches of prod uc战略farms may lose irrigation water as well s do dry。地下水是从地面通过土壤孔隙向下流动的水。越来越多的生产性农场可能因水井干燥而失去灌溉水。，surface waters from rivers and lakes are important sources of public water supplies because of the high with drawal rates they can normally susts河流和湖泊的地表水通常是公共供水的重要来源，因为它可以保持高利用率，并通过几个过程将几

8、乎无限制的海水转化为淡水。desaliation is the general term used for the removal of dissolved salts from water . electro dialysis invoices forced migration of charged ions thhe脱盐是去除水中溶解盐的常用术语。电渗析与将电位应用于包含光水的细胞，强迫带电离子通过阳离子渗透或通过负离子渗透的膜有关。reclaimed waste water refers to water that has been treated sufficiently for direct reuse in industry and agriculture，and for limited municipal回收废水已经在工业和农业中直接重复使用，并为有限的市政应用充分处理了水。allowing water to cleaning se itself by percolating through soil is an