【Daily Question】Utilities - Water Supply and Drainage - 20200510
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In a certain building, reclaimed water is used for landscaping and toilet flushing. The source water for this reclaimed water is water from showers, washing basins, and laundry; kitchen wastewater is not recycled. The water collected for showering, washing up, and laundry is 149 m3/day, 45 m3/day, and 63 m3/day respectively, while the kitchen wastewater amounts to 44 m3/day. 49 m3/d of recycled wastewater is required for toilet flushing, with a discharge coefficient of 90%; 83 m3/d of recycled wastewater is needed for landscaping. If the self-water consumption of the reclaimed water treatment equipment is set at 15% of the reclaimed water usage, then the overflow volume of the reclaimed water system is ( ) m³/day. A.105.2 B.125.0 C.149.2 D.169.0 Answer: A Raw wastewater volume = 149 + 45 + 63 = 257 m3/d ； Recycled water consumption = (83 + 49) × 1.15 = 151.8 m³/day ； System overflow water volume = 257 - 151.8 = 105.2 m³/day
In a certain building, reclaimed water is used for landscaping and toilet flushing. The source water for this reclaimed water is water from showers, washing basins, and laundry; kitchen wastewater is not recycled. The water collected for showering, washing up, and laundry is 149 m3/day, 45 m3/day, and 63 m3/day respectively, while the kitchen wastewater amounts to 44 m3/day. 49 m3/d of recycled wastewater is required for toilet flushing, with a discharge coefficient of 90%; 83 m3/d of recycled wastewater is needed for landscaping. The self-water consumption of the reclaimed water treatment equipment is set at 15% of the reclaimed water usage; thus, the overflow volume from the reclaimed water system is (A. 105.2) m³/day.
No correct option: (149+45+63)*0.9 – (49+83)*1.15 = 79.5