Water problems in the future will become more intense and more complex. Our increasing population will tremendously increase urban wastes, primarily sewage. On the other hand, increasing demands for water will decrease substantially the amount of water available for diluting wastes. Rapidly expanding industries which involve more and more complex chemical processes will produce larger volumes of liquid wastes, and many of these will contain chemicals which are noxious. To feed our rapidly expanding population, agriculture will have to be intensified. This will involve ever-increasing quantities of agricultural chemicals. From this, it is apparent that drastic steps must be taken immediately to develop corrective measures for the pollution problem.
将来水的问题会变得更加尖锐复杂。不断增长的人口将大量增加城市废物,主要是生活污水。另一方面,用水需求的不断增长将使得可用于稀释废水的水量大大减少。快速发展的工业越来越多地采用各种复杂 的化学方法,从而使废水大量增多,而很多废水中含有种种有害的化学 物质。为了养活迅速增长的人口,农业必须集约化,这就会不断增加农 用化学品的用量。由此看来,必须立即采取果断行动研究污染问题的整治措施。
There are two ways by which the pollution problem can be dwindled. The first relates to the treatment of wastes to decrease their pollution hazard. This involves the processing of solid wastes prior to disposal and the treatment of liquid wastes, or effluents, to permit the reuse of the water or minimize pollution upon final disposal.
整治污染问题的方法有两种。第一种是通过废物处理减少污染的危害,包括固体废物排放? 之前?的处理和液体废物或污水的处理,从而实现水的循环利用或者尽量降低最终排放前的污染程度。
A second approach is to develop an economic use for all or a part of the wastes. Farm manure is spread in fields as a nutrient or organic supplement. Effluents from sewage disposal plants are used in some areas both for irrigation and for the nutrients contained. Effluents from other processing plants may also be used as a supplemental source of water. Many industries, such as meat and poultry processing plants, are currently converting former waste products into marketable byproducts. Other industries are exploring potential economic uses
第二种方法是开发全部或部分废物的经济利用。农田中施用农家肥 补充肥分或有机肥。有些地区使用污水处理厂排放的污水进行灌溉施肥。其他水处理厂排出的废水也可用作补充水源。现在,禽肉加工等许 多行业正在把原先废弃的下脚料加工成可供出售的副产品,其他行业也在研究废弃物的经济利用可能途径。
烦恼要说出来 独自担忧真的会变内伤!
神奇奶奶:对抗引力水上漂
躺枪否?17个证据你已成宇宙黄金剩斗士
新加坡女子用针线“绣出”旅行记忆
经济学家教你如何坚持去健身房
囧研究 我们为什么都爱抠鼻屎?
情人节必备 来一发情感测试嘛?
斑马条纹到底有何用?
贱熊归来 超级碗曝光泰迪熊2预告
大学生每个月需要多少零花钱?
从秘书到作家 JK罗琳自述成功之路
一招脱单 世界上最有用搭讪情话
大学生上“甜心干爹”网站挣学费
山姆抱四奖满载而归 2017格莱美获奖名单
12年婚姻 我们如何顺利度过七年之痒
霍金现身英国奥斯卡 众星排队求见
办公室午睡好处多 3招让你睡的更香
御驾亲征 约旦国王欲上前线空袭ISIS
太聪明的人为何不适合创业
如何在独身旅行时交朋友 谈恋爱
会9国外语的超级学霸 看他怎么学?
情人节 达令的多种英文表达你造吗
维他命饮料 究竟是好是坏
大蒜味可乐 日本暗黑料理又出新成员
自拍也能开户 银行业务一拍就搞定
伊朗建盐巴餐厅 可净化城市空气
老娘单身肿么了 一个人过情人节完美攻略
歪果仁纠结了:羊年的羊到底是goat还是sheep?
The Chance to Close to Nature 接触自然的机会
美国保安一生清贫 死后捐款600万刀
| 不限 |
| 英语教案 |
| 英语课件 |
| 英语试题 |
| 不限 |
| 不限 |
| 上册 |
| 下册 |
| 不限 |