深床滤池在污水厂地表Ⅳ类水提标改造中的应用

Application of Deep Bed Filter in WWTP Upgrading Project to Meet Class Ⅳ Standard of Surface Water

合肥市某污水处理厂设计排放主要指标需达到地表水环境质量Ⅳ类标准。该项目深度处理单元采用Leopold elimi-NITE反硝化深床滤池工艺,兼顾了过滤、反硝化脱氮及除磷功能,使污水厂出水稳定达到TN<5 mg/L、TP<0.3 mg/L、SS<10 mg/L的目标。深床滤池设计采用弧形堰、恒液位控制及"前馈+后馈"精确碳源投加控制方式,力求最经济的碳源投加量。

The effluent qualities of a wastewater treatment plant （WWTP） in Hefei City was required to meet the surface water environment quality class Ⅳ standard （TN ≤5 mg/L）. The Leopold elimi-NITE denitrification deep-bed filter, which is a combination of filtration, denitrification and dephosphorization processes, was applied in the WWTP. This technology could ensure the effluent quality as follows： SS 〈 10 mg/L, TN 〈5 mg/L and TP 〈0.3 mg/L. The curve weir and constant level control for better filter operation was installed in the deep bed filter. In addition, an advanced carbon dose control system with forward ＆ backward was used to achieve efficient carbon usage.