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进行节约用水设计时需要考察发达国家的典型用水方式。下列表1为美国的水平衡表,表2为美国商业部公布的工业用水量表。由表1可见,农业用水大于工业用水。例如生产1Kg钢要用300Kg水,而生产1Kg小麦要用1500Kg水。一个好的设计师必须考虑用水的全部费用,明显的费用有:从水源供水的费用、要求专门处理的费用、控制水质和水量的设备费、废水的处理和处置费。由于设计不当而
When designing for water conservation, it is necessary to examine the typical water use patterns in developed countries. Table 1 below shows the U.S. water balance sheet and Table 2 shows the U.S. Department of Commerce’s industrial water consumption table. Table 1 shows that agricultural water is greater than industrial water. For example, 300 kg of water is used to produce 1 kg of steel, while 1500 kg of water is used to produce 1 kg of wheat. A good designer must consider the full cost of water. The obvious costs are: the cost of water supply from the water source, the cost of special treatment, the equipment cost to control the water quality and quantity, the waste water treatment and disposal fee. Due to improper design