【Daily Question】Utilities - Water Supply and Drainage - 20200317

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This post was last edited by hesonchang214 on 2020-3-19 at 13:01. Among the statements regarding the design of oil separators, which one does not conform to the \"Code for Design of Building Water Supply and Drainage Systems\"? A. The wastewater flow rate shall be determined based on the design peak flow rate. B. The retention time of wastewater containing edible oil in the tank should be between 2 and 10 minutes. C. The volume of the oil-containing portion in the oil separation tank must not be less than 25% of the tank’s total effective volume. D. The depth from the bottom of the outlet pipe in the oil separation tank to the bottom of the tank shall not exceed 0.8 meters. Answer: D. The design of oil separation tanks shall comply with the following requirements: 1. The wastewater flow rate shall be calculated based on the design peak flow rate ； 2. The flow velocity of wastewater containing edible oil in the tank shall not exceed 0.005 m/s ； 3. The residence time of wastewater containing edible oil in the tank should be 2–10 minutes ； 4. The volume of the oil-containing portion in the oil removal tank for manual oil removal must not be less than 25% of the tank’s effective volume ； 5. The oil separator should be equipped with a movable cover. The water inlet pipe should be designed to allow for cleaning ； 6. The depth from the bottom of the oil separator outlet pipe to the bottom of the tank shall not be less than 0.6 m