英语翻译In addition,natural phenomena such as volcanoes,storms,e

英语翻译
In addition,natural phenomena such as volcanoes,storms,earthquakes etc.also
cause major changes in water quality and the ecological status of water.However,these are not deemed to be pollution.The term “pollution” implies that the poor quality is due to human activities.Human activities cause more serious,longer term and larger scale problems.In general terms,water is considered to be polluted when it contains enough foreign materials to render it inappropriate for an intended use,such as for drinking,recreation,industrial use or fish farming.
11.2 Water Pollutants
Water pollution that varies in extent and variety of pollutant from one region to another has many causes and characteristics.Based on their health effects,wide range of pollutants discharged to surface waters can be grouped into broad classes.For example,the following list identifies eight types of pollutants:
• Pathogens;
• Oxygen-demanding substances;
• Nutrients;
• Suspended solids;
• Heavy metals;
• Toxic organics;
• Inorganic chemicals;
• Heat;
• Hazardous materials.
Each of these types of pollutants and their importance are indicated in Table
11.2.To estimate the hazard of different pollutants,not only their hazardous properties,but also other factors such as the volumes of their input into the environment,the ways and scale of their distribution,the patterns of their behavior in the water ecosystems,their ability to accumulate in living organisms,the stability of their composition and other properties should be taken into consideration.
11.2.1 Sources of Water Pollutants
Another classification of pollutants is according to the nature of their origin as either a point source or a nonpoint (dispersed) source pollutant.Point sources are generally man-made and mediated by man-made devices such as pipes and effluent outfalls.These sources are attributed to a defined location and include domestic sewage and industrial wastewaters which are collected and conveyed to a discharge point into the receiving environment.Domestic sewage consists of
请不要用翻译工具敷衍我，我是真想学点东西。

此外,自然现象,例如火山、暴风雨、地震等
造成重大改变水质和生态状况的水.然而,这些都不认为是污染.术语“污染”意味着那个可怜的质量是由于人类的活动.人类活动造成更严重的、长期的和规模较大的问题.一般而言,水被认为是污染,它含有足够的外国材料来渲染不恰当的使用,如投标人的饮用水、娱乐、工业用或渔业.
11.2水污染物的产生
水的污染程度不同,在各种各样的污染物,从一个地区有许多原因和特点.根据他们的健康效应,广泛的污染物排放到地表水可以划分为广阔的课程.例如,下面的列表识别8种污染物.
•病原体.
•Oxygen-demanding物质.
•营养.
•悬浮固体物.
•重金属.
•有机毒物.
•无机化学.
•热.
•有害物质.
每一种类型的污染物,其重要性都在桌子
4.估计不同污染物的危害,不仅其危害性,但还有其他的因素,如体积的输入到环境、途径和规模的分布情况,他们的行为模式的水生态系统中,他们的能力,在生物积累的稳定性及其它性能的成分,应考虑.
水污染物的来源11.2.1
另一种分类污染物是根据其原产地为点源或nonpoint(分散)源污染.通常是人造的,点源介导的人造装置,例如管道和出水需氧量.这些来源都归结为一定义的位置,包括污水、工业废水,收集并传递到排放点到接收的环境.生活污水组成