地下水源除铁锰滤池调试运行实践及思考

为了解决沈阳市辽中区西水厂出水锰含量长期超标问题,对该水厂除铁除锰滤池进行调试。采用扫洗、翻砂和添加10~15 cm成熟滤料等措施对滤池进行调试,68 d后出水Mn2+浓度低于0.1 mg/L,滤池恢复期为68 d;只采用扫洗、翻砂措施时,滤池恢复期为80 d;未进行调试滤池的出水锰浓度会逐渐升高,可达到0.48~0.61 mg/L,出水铁、锰不达标。用高压水枪对滤层表面进行扫洗和翻砂能够有效解决滤池堵塞问题,调试成熟且稳定以后的滤池过滤周期可达25~30h。水厂成功运行时滤池的平均滤速为7~14 m/h、反冲洗强度为11~12 L/(s·m2)、反冲洗时间为20~25 min、过滤周期为24 h,滤池出水水质能够达到《生活饮用水卫生标准》(GB 5749—2006)的要求。

Practice and Consideration of Commissioning and Operation of Iron and Manganese Removal Filter Treating Groundwater in Liaozhong District of Shenyang City

An iron and manganese removal filter of the West Waterworks in Liaozhong District of Shenyang City was debugged to solve the problem of excessive manganese content in effluent for a long time.The filter was debugged by cleaning,sanding and adding 10-15 cm mature filter materials.After68 days,Mn2+in the effluent was lower than 0.1 mg/L,and recovery period of the filter was 68 days.The recovery period of the filter was 80 days when only cleaning and sanding were adopted.The effluent manganese concentration of the filter without commissioning gradually increased and it eventually reached0.48-0.61 mg/L,and the effluent iron and manganese concentration couldn’t meet the standard.Using a high-pressure water gun to clean and scrape the surface of the filter layer could effectively solve the problem of filter blockage.The filtration period reached 25-30 hours after successfully commission of the filter.During the operation of the waterworks,average filtration velocity of the filter was 7-14 m/h,backwash intensity was 11-12 L/(s·m2),backwash time was 20-25 min,and filtration period was24 hours.The effluent quality could meet Standards for Drinking Water Quality(GB 5749-2006).