【Daily Question】Utilities - Water Supply and Drainage - 20200115
Thread Content
A combined sewer system is adopted in the following situations ( ). A. The community is equipped with a drainage system that separates domestic sewage from domestic waste water. B. When there is a sewage treatment plant in the city. C. When buildings have high requirements regarding sanitary standards. D. When domestic sewage must be treated in septic tanks before it can be discharged into the municipal drainage system. Answer: B is the correct answer. The layout of outdoor drainage pipes is one of the main factors to consider when determining the indoor drainage system. When the outside uses a separate system for sewage and wastewater, the indoor drainage pipes should also be arranged in a separate system; therefore, a combined system is not suitable in the scenario described in option A.
B. When the city has a sewage treatment plant