水污染的三个主要原因化学,水污染的三个主要原因英语是有污染源排放产生水污染的污染物,是水污染的首要条件;污染源超标排放产生水污染的污染物,超过水体的自净能力,产生水污染;多家污染源排放水污染物,即使是达标排放,当超过水里的环境容量时,也会产生水污染的。
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水污染的三个主要原因化学,水污染的三个主要原因英语
有污染源排放产生水污染的污染物,是水污染的首要条件;污染源超标排放产生水污染的污染物,超过水体的自净能力,产生水污染;
多家污染源排放水污染物,即使是达标排放,当超过水里的环境容量时,也会产生水污染。
水污染是由有害化学物质造成水的使用价值降低或丧失,污染环境的水。
污水中的酸、碱、氧化剂,以及铜、镉、汞、砷等化合物,苯、二氯乙烷、乙二醇等有机毒物,会毒死水生生物,影响饮用水源、风景区景观。
污水中的有机物被微生物分解时消耗水中的氧,影响水生生物的生命,水中溶解氧耗尽后,有机物进行厌氧分解,产生硫化氢、硫醇等难闻气体,使水质进一步恶化。
废水从不同角度有不同的分类方法。
据不同来源分为生活废水和工业废水两大类;
据污染物的化学类别又可分无机废水与有机废水;
也有按工业部门或产生废水的生产工艺分类的,如焦化废水、冶金废水、制药废水、食品废水等。
用英语回答:水污染的原因;如何保护水资源
In 21 century, water pollution is a big problem.
we all know water is important to us. but still, some people dont care about it, and keep polluting the water. they thought this will not affect them, but in fact, it does.
there are several ways that tell us how water get polluted.
1. polluted water came to the river from the factory.
2. people throw garbage in to the water.
3. garbage things from the factory polluted the water under ground.
4. oil come out from the boat....
to solve these problems, we need to make a plan. first, we need to know what cause the water pollution, it is the things i worte on the top. second, we should do something at home like: to tell our parent not waste water.....
then, we should do something that can effect other people around us. like to make a poster that tell how important water is....
after that, we should do something globally, like writer a letter and send it to newspaper office to let more people care about it.
now, every one, please take an action, when there is only drop of water in the world, that will be our tears.
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