合肥市老城区全地下雨水调蓄池工程设计

Project Design of the Full Underground Stormwater Detention Tank for Old Urban Area of Hefei City

在合肥市老城区初期雨水污染控制工程中,通过修建雨水调蓄池,降低合流制排水系统溢流频率和溢流量,经济有效地控制初期雨水和合流污水的污染。调蓄标准为8 mm降雨量,杏花调蓄池的调蓄容积为17 500 m^3。结合老城区内公园绿地及水体,采用全地下式建设模式。调试期间,在格栅后增设穿孔花墙,降低进水前期过栅流速;将格栅间内的风机更换为双速风机,在进水期间,有大量臭气外逸时风机切换至高速运行。一年多的运行证明,通过设置调蓄池,有效降低了合流制排水系统雨天放江量,对南淝河水质改善起到了积极的作用。

In the rain water pollution control project in the initial stage of the old urban area of Hefei,in order to control the pollution of initial stage of rainwater and combined wastewater economically and effectively,the stormwater detention tank was constructed to reduce the overflow frequency and discharge of the combined drainage system. The regulation and storage standard was 8 mm of rainfall,the storage capacity of Xinghua detention tank was 17 500 m^3. Combined with the park green spaces and water bodies in old urban area,the underground construction mode was adopted in the detention tank.During the commissioning period,a perforated wall was placed behind the grille to decrease the flow velocity of the gate in the pre-inlet stage;the draught fans in the grille room were replaced with double speed fans,so that the fans could switch to high-speed mode when a large amount of odor would overflow during flooding. It was proved that the overflow discharge of the combined drainage system was obviously reduced during the rainy days after one-year operation of detention tanks. The project is benefited to the improvement of the Nanfei River’s water quality.