补全短文
A. decrease B. liquid C. are used Phrases: A. The first relates to the treatment of wastes to【T7】______their pollution hazard B. Effluents from sewage disposal plants【T8】______in some areas C. "prior to" disposal and the treatment of【T9】______wastes There are two ways by which the pollution problem can be dwindled.【T10】______This involves the processing of solid wastes【T11】______, or effluents, to permit the reuse of the water or minimize pollution upon final disposal. A second approach is to develop an economical use for all or a part of the wastes. Farm manure is spread in fields as a nutrient or organic supplement.【T12】______both for irrigation and for the nutrients contained.