Design Method and Operate Process of Initial Rainwater and Wastewater Storage Tank of Nanfei Creek Drainage District in Eastern China

摘要

A design method of an initial rainwater storage tank of combined sewer overflows of Nanfei Creek in Eastern China was discussed. The drainage district of the storage tank was almost a rectangle and the capacity of the tank can be calculated by an equation derived from the accumulation flux. The velocity and concentration time of the drainage ditch depended on the rain intensity, while calculating the storage tank capacity by the adopted equation. The capacity of the initial rainwater storage tank of QING I and QING II ditch, calculated by the equation, was 10,101 m3, which was approximate to the result calculated by Germany sewerage society standard. The operation of the storage tank could be controlled by a programmable logic controller, and devided into seven models: rest model, influent model 1, influent model 2, effluent model, effluent model 1, effluent model 2 and rinse model.