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Which of the following statements regarding the design of hospital wastewater treatment is correct? ( ) A. When septic tanks are used for pre-treatment of hospital wastewater prior to disinfection, their capacity should be calculated such that the wastewater remains in the tank for at least 24 hours. B. Disinfected hospital wastewater must not be discharged into water bodies located within 100 meters upstream of points where potable water is drawn. C. When discharging hospital wastewater into surface water bodies, a first-stage wastewater treatment process should be employed. D. Chlorine disinfection is generally the preferred method for disinfecting hospital wastewater. Answer: D. Option A is in line with the provisions of Article 4.8.13 of the Code for Design of Building Water Supply and Drainage Systems. The retention time of wastewater in the tank should be no less than 36 hours. Option B does not comply with the provisions of Article 4.8.12 of the Code for Design of Building Water Supply and Drainage. Disinfected hospital wastewater must not be discharged into water bodies within 1000 meters upstream and 100 meters downstream of the points where potable water is collected. Option C does not comply with the provisions of Article 4.8.9 of the Code for Design of Building Water Supply and Drainage. A secondary wastewater treatment process should be used when discharging hospital wastewater into surface water bodies. Option D complies with the provisions of Article 4.8.14 of the Code for Design of Building Water Supply and Drainage Systems