However, this method will easily make the water body size of the main pipe become too large, the capacity of sewage will increase a lot correspondingly, and the cost of construction and production operation will also be correspondingly increased significantly; if the closure type combined system is adopted, a small part of mixed sewage can be directly discharged into the urban water body through the overflow well of the main pipe in rainy days, Water body may still be seriously polluted<br>
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