【Daily Question】Utilities - Water Supply and Drainage - 20200508

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Which of the following statements about reclaimed water sources is incorrect? A. When wastewater from general hospitals is used as a source of reclaimed water, it must be disinfected before it can be used for purposes such as car washing and toilet flushing. B. Radioactive wastewater shall not be used as a source of reclaimed water. C. Rainwater from building rooftops can be used as a source of reclaimed water or as a supplement to it. D. The effluent from urban sewage treatment plants can be used as a source of reclaimed water for residential areas. Answer: A. Option B is in line with the provisions of Article 3.1.7 of the current “Code for Design of Reclaimed Water in Buildings”. Radioactive wastewater poses a significant threat to human health; for safety reasons, regulations stipulate that it must not be used as a source of reclaimed water, along with wastewater from hospitals treating infectious diseases and tuberculosis, and this is set as a mandatory requirement. Option C complies with the provisions of Article 3.1.8 of the current Code for Design of Reclaimed Water in Buildings. Rainwater is an excellent source of reclaimed water; regulations stipulate that rainwater from building roofs can be used as a source of reclaimed water or as a supplement to it. Option D complies with the provisions of Article 3.2.2 of the current \"Code for Design of Reclaimed Water in Buildings\"; the effluent from urban sewage treatment plants can serve as one of the possible sources of reclaimed water for building complexes. Urban sewage treatment plants produce large volumes of wastewater with a stable water supply; therefore, it is economical to carry out further treatment within residential areas to meet the standards for reclaimed water. As a result, regulations stipulate that such water can be used as a source of reclaimed water for residential complexes. Option A does not comply with the provisions of Article 3.1.6 of the current Code for Design of Reclaimed Water in Buildings. When wastewater from general hospitals, which contains a high amount of pathogens, is used as a source for reclaimed water, even after disinfection, it can only be utilized in separate systems that do not come into direct contact with people, such as for irrigation purposes. Uses such as car washing and toilet flushing may involve contact with the human body, and such water should not be used for such purposes