【Daily Question】Utilities - Water Supply and Drainage - 20200318
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A residential building uses a combined sewer system. Based on calculations, the effective volume of the septic tank is 40 m3; if a three-chamber septic tank is used, then the effective volume of each chamber should be ( ). A. 24m3, 8m3, 8m3 B. 13.4m3, 13.3m3, 13.3m3 C. 30m3, 5m3, 5m3 D. 20m3, 10m3, 10m3. Answer: A. According to Article 4.8.7, Paragraph 2 of the current “Code for Design of Building Water Supply and Drainage”, the capacity of the first chamber of a three-chamber septic tank should be 60% of the total capacity (24 m3), while the capacity of each of the second and third chambers should be 20% of the total capacity (8 m3 each). Therefore, A is correct
A. 24m3, 8m3, 8m3
A. 24m3, 8m3, 8m3 60% 20% 20%