For non-open-type chemical plant buildings, is it necessary to consider initial polluted rainwater? Why?

Thread Content

This post was last edited by cyj2065cyj2065 on 2016-6-1 11:12. According to Section 2.0.1 of the \"Design Code for Wastewater Treatment and Reuse in the Chemical Industry\" (GB50684-2011), initial rainwater refers to the rainwater that collects on the surfaces of areas potentially contaminated by materials. 3.0.2 The maximum hourly wastewater volume for wastewater treatment projects shall be determined as the sum of the wastewater generated from production processes, domestic activities, initial pollution from rainfall, and unforeseen wastewater volumes... In 3.0.2, the amount of initial pollution from rainfall should be calculated based on the total amount of pollution-causing rainwater during the initial stage of a rainfall event and the time required to empty the storage facilities for such water; the calculation can be done using the following formula: qs = (Fs * Hs) / (ts * 1000), where Fs represents the area of the polluted area in square meters, Hs represents the rainfall depth in 10–30 mm, and ts represents the time required to empty the storage tanks for initial pollution rainwater, which should be less than 120 hours. --------------------------------------------- From the “Environmental Protection Design Code for Chemical Industry Construction Projects” (GB50486-2009), 2.0.11 defines initial rainfall as rainwater that has just fallen. Precipitation volume during the first 10–20 minutes of a rainfall event --------------------------------------------- Question: For non-open (highly controlled) chemical manufacturing facilities, is it necessary to take initial polluted rainwater into account? Why?