那个化工厂排出大量有毒的废水。
A lot of poisonous waste water comes from that chemical factory.
有些工厂将生产废水向海中倾泻。
我们可以如何处理废水？
处理废水是为我们提供淡水的一种好方法。
Treating wastewater is a good way to provide fresh water for us.
现在我们已经掌握了处理和再利用废水的技术。
Now we have got the technology to treat and reuse the wastewater.
据说有些工厂把废水排入我们城市附近的河里。
It's said some factories pour waste water into the river near our city.
政府应该采取严厉的措施阻止工业废水非法排放。
The government should take extreme measures against illegal industrial waste-water discharge.
世界上80%的废水根本没有得到处理，它们正在流入海洋。
80% of wastewater around the world is not treated at all, and it is running into oceans.
现在芝加哥的废水正在排入芝加哥河，该城市的下一步是清理被污染的河流。
Now Chicago's waste water was draining into the Chicago River, the city's next step was to clean the polluted river.
在贫穷、干旱的地区，未经处理的废水是让农民维持生计的唯一可用灌溉资源。
In poor, dry regions, untreated wastewater is the only viable irrigation source to keep farmers in business.
从沉降池流出的废水被加入消毒剂以杀死一切有害生物。
Effluent from the sedimentation tank is dosed with disinfectant to kill any harmful organisms.
通常，废水来自家庭、工厂、医院等。
Usually, wastewater comes from homes, factories, hospitals and so on.
一些工厂阻止废水流入河流。
其中，废水问题尤为严重。
为什么我们必须处理废水？
工厂废水在回归自然之前必须进行净化。
Factory wastewater has to be cleaned before it goes back to nature.
暴风雨的雨水流经街道时也会变成废水。
The rain also changes into wastewater when it is running down the street during a storm.
家庭废水可以重复使用。
废水处理厂截留了其中的83%到99%。
Wastewater treatment plants hold back 83 to 99 percent of them.
废水会更少。
本实验采用光电催化法处理大量马扎林废水。
This experiment applied photo-electric-catalyzed to treat substantive mazarine wastewater.
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