大型老旧水厂V型滤池改造实践

Reconstruction Practice of V-type Filter in a Large-scale Old Water Treatment Plant

针对大型老旧水厂V型滤池因设计年代早而存在的滤头堵塞、滤帽破裂、滤板错台、池壁结垢、反洗不匀、滤料磨损、跑砂、浊度超标等问题,对V型滤池进行了改造。结合水质新标准、设计新规范的技术要求,给出技术改造思路和诊断分析。改造后的运行结果表明,V型滤池出水浊度长期稳定在0.3 NTU以下,水质满足《生活饮用水卫生标准》(GB 5749-2006),反冲洗周期由24 h延长至36 h,反洗水量节约56%,节省反洗水量23.5×10^4m^3/a。运行实践表明,在未增设初滤水排放设施的情况下,采取控制滤速、更换滤料、调平滤板、清通滤头、调整反洗工况等措施,仍可显著提升老旧V型滤池的运行效果。

The V-type filter was reconstructed in a large-scale old water treatment plant,in view of the problems due to obsolete design such as filter head blockage,filter cap rupture,filter plate dislocation,tank wall scaling,backwash unevenness,filter material wear,sand loss,and high turbidity,etc.The technical reconstruction ideas and diagnosing analysis were provided according to the requirements of new water quality standards and filter design codes.The operation results showed that the turbidity of V-type filter effluent was stably below 0.3 NTU and met the Standards for Drinking Water Quality(GB 5749-2006).The backwashing cycle was extended from 24 h to 36 h and the backwashing water volume was saved by 56%.Hence,the annual backwashing water was saved by 23.5×10^4 m^3.The operation practice indicated that the operation effect of the old V-type filter could be significantly improved by controlling the filtration rate,changing the filter material,leveling the filter plate,clearing the filter head,and adjusting the backwashing condition without adding the initial filter water discharge.