给排水工程与环境工程专业英语 节选

《给水排水工程与环境工程专业英语》共有5部分内容：概述、给水与废水收集系统、水处理、废水处理和环境管理。每部分为4个单元，每单元一篇课文，两篇阅读材料，并附有难点注释、词汇表和练习题。附录包括词汇汇总表、课文译文和科技英语语法特点等。《给水排水工程与环境工程专业英语》既注重学生专业英语学习，又考虑拓宽相关专业知识面，能使读者在较短时期内掌握给水排水工程与环境工程专业常用词汇。《给水排水工程与环境工程专业英语》特点之一是语言的文体广泛，难易程度循序渐进；特点之二是兼顾专业性与学术性；特点之三是突出对阅读和翻译能力的培养。《给水排水工程与环境工程专业英语》可以作为给水排水工程与环境工程专业英语教材，亦可作为与之相关专业的工作者、教师和工程技术人员自学专业英语的读本。《给水排水工程与环境工程专业英语》配有电子课件，免费提供给选用本教材的授课教，师。课件索取方式参见书末“信息反馈表”。

给排水工程与环境工程专业英语 相关资料

插图：In addition to transporting water over long distances, modern water-supply systems also use several techniques for purification. One of them is filtration. The water is passed through a filter that consists of a bed of sand or gravel, which removes a large proportion of the solids that might otherwise contaminate the supply. Another process is aeration. Sprays of water are shot into the air, where sunlight and oxygen help kill bacteria and also remove gases with an unpleasant odor or taste; or air is bubbled into or through the water. A third method involves treatment with chemicals, usually chlorine, to kill harmful bacteria. The process is known as chlorination.Part of providing a safe water supply is disposing of liquid and solid wastes. This problem has become acute in recent years not only because of world-wide population growth, but also because of the vast amount of waste created by industrial processes and by the great mountains of trash that are the by-product of increased consumption. A large number of modern drainage systems use the same sewers to dispose of domestic wastes and runoff water from storms. Many of these systems were designed to empty into streams or other bodies of water where nature itself purified the water over a period of time. Now, however, the amount of waste has become so great that many streams and lakes and even the seas have become polluted. More and more treatment plants are being built to purify water before it is released back into the environment. Therefore, the modern trend is to build separate drainage systems for storm runoff and domestic wastes so that the treatment plants do not have to process the runoff water, which is relatively unpolluted.There are a number of different methods by which solid wastes can be removed or rendered harmless. Several of them are ordinarily used in combination in treatment plants. One of the processes is filtration. Anothe

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