The issue of the size of the accident emergency pool
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I sought help in the environmental protection section; some users said this question should be posted here, and experts provided answers, so it was posted here again. When calculating the size of an accident emergency pool, according to the latest guidelines for designing measures to prevent and control water pollution, the formula for the size of such a pool is: V_total = (V1 + V2 – V3)max + V4 + V5, where V5 = 10qF, with q being the rainfall intensity in mm； Based on average daily rainfall ； q=qa/n where qa is the annual average rainfall, in mm ； n —— Average annual number of rainy days. F – the area from which rainwater must be collected and sent to the accident wastewater treatment system. The problem is that if we use qa=9 mm and F=5 hectares as the area of the factory site (since there is only one main rainwater pipe in the factory, the area from which rainwater can be collected equals the total area of the factory), then V5 comes out to be 4,500 cubic meters. This is not feasible in actual production. How do you guys solve this problem?
You can set them up separately in locations where leaks may occur. We no longer need to consider things like rainwater; it is sufficient as long as the capacity of the accident tank is greater than the maximum volume that can be stored in each respective device.
Bro: You’ve misunderstood. Under normal circumstances, factory sites require the separation of clean and waste water streams. Factory areas typically have external ditches and ditches adjacent to the equipment; water from the roads between the various pieces of equipment flows into the external ditches, while water from within the production equipment goes into the ditches adjacent to that equipment. In the event of an accident, the water in the external ditches is discharged directly, whereas the water in the internal ditches flows into the emergency containment tanks. When calculating the area, you need to determine the area of the area where the accident occurred. You say that there is only one rainwater pipe for an entire plant covering five hectares – that’s a serious problem with your equipment; fix it as soon as possible.
Under normal conditions, your rainwater will not enter the accident emergency pool. In the event of an anomaly, not all the rainwater from the entire plant flows into the accident emergency pool; only the fluids from the area where the accident occurs and the rainwater falling in that area at that time do so. Therefore, the volume is not as large as you calculated.
V5 – the amount of rainfall that may enter this collection system in the event of an accident. If an accident occurs inside a facility, V5 can be 0; only in the case of an accident at an outdoor installation is it necessary to calculate the rainfall in that area. Personal opinion, for reference only
Nowadays, companies require the separation of rainwater and wastewater. The size of the emergency spill containment tank is generally determined based on the amount of water needed to handle an incident over a period of 2 hours, (which corresponds to the water output from fire hydrants)