In cases where sewage mud is used, expensive chemical fertilizer use can be avoided.

在使用污泥的情况下，可以避免使用昂贵的化肥。

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The Liujiang River, which is the main source of drinking and industrial water use of the city, suffered from pollution from untreated sewage and rainwater flows.

作为柳州市工业和居民生活用水主要水源的柳江则受到部分未经处理的污水和雨水排放污染。

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After its use, the waste water then has to be treated, and some methane from the sewage escapes into the atmosphere.

水使用过之后的废水需要处理，而污水中的一些甲烷会逃逸到大气中。

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Osman says other concerns include sewage,unregulated restaurants, and the use of all-terrain vehicles for recreation.

VOA: standard.2010.08.05

Use of sewage and industrially contaminated water for irrigation has drenched Punjab's soils in heavy metals and other poisons.

ECONOMIST: Punjabis are poisoning themselves

Simply, the manufactured high-rises of today allow greater economies of scale regarding energy use, building materials, sewage and waste, and overall footprint on the land.

FORBES: Going Vertical

Do we really want future generations to not be able to use the river because of the high level of sewage in it?

BBC: Thames Water bills rise to pay for Thames super sewer