生物慢滤池处理径流雨水的运行优化研究

Study on Operation Optimization of Biological Slow Filter to Treat Runoff Rainwater

针对传统的生物慢滤池滤层厚度大、滤速低、产水量少的问题,进行优化滤料、提高滤速、改进池型、减小滤层厚度的调整,将装置运行4个月。试验表明,当生物慢滤池的滤层厚度均采用0.11m、滤速提高至0.4~0.6m/h时,CODMn、浊度、TP、TN的去除率与滤层厚度0.15~0.18m、滤速0.1~0.3m/h的传统生物慢滤池相当。采用折返式滤箱,降低装置总高度,在保障出水水质前提下降低了电耗。因此,以径流雨水为水源,通过改进池型、提高滤速、减小提升泵扬程,可满足《城市污水再生利用-景观环境用水水质》(GB/T18921-2002)标准和《生活饮用水卫生标准》(GB5749-2006)标准。

The traditional biological slow filtration has been facing problems such as larger filter layer thickness,lower filtration rate and lower production.So,operation plan of biological slow sand filtration was discussed,which include optimizing filter material,improving filter speed and type as well as reducing the filter thickness.The improved device had been operated four months.Test shows that when the layer thickness was chosen 110 cm and the filtration rate was increased to 0.4-0.6 m/h,the removal rate of CODMn,turbidity,TP and TN in biological slow sand filtration was the same as the traditional ones with 0.15-0.18 mfilter thickness and 0.1-0.3 m/h filter speed.The folded-type filter was used to reduce the height of the device and electric energy consumption on the premise of ensuring outlet water quality.Therefore,taking the runoff rainwater as water source,improving the device structure,increase of filtration rate and reducing pump lift can meet the reuse of urban recycling water-water quality standard for scenic environment use and standards for drinking water quality.