【Daily Question】Utilities - Water Supply and Drainage - 20200319

2020-03-19View Original

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The wastewater from the public restrooms in the basement of a shopping mall must be collected in a collection tank, and then pumped out using a sewage pump. Given that the maximum hourly wastewater flow is 2 m3/h, and two wastewater pumps with a flow rate of 10 L/s each are used (one in use and one as a backup, under automatic control), the minimum effective volume of the collection tank is ( ) m3. A. 2 B. 3 C. 5 D. 6.5 Answer: B According to Article 4.7.8, Paragraph 1 of the current Code for Design of Building Water Supply and Drainage, the effective volume of the collection tank should not be less than the discharge volume of the largest sewage pump over a period of 5 minutes; therefore, its minimum effective volume V = 10 × 5 × 60 ÷ 1000 = 3 m3. Therefore, B is correct

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【Daily Question】Utilities - Water Supply and Drainage - 20200319

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