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| Effect of aged biological activated carbon on the filtration resistance and performance of biological activated carbon filter |
| LIU Jing-yan1,2, LU Xiao-yan2, YOU Zuo-liang2, ZHANG Jin-song2, GUO Jian-ning2 |
1. College of Civil Engineering, Hunan University, Changsha 410082, China;
2. Shenzhen Water (Group) co., Ltd, Shenzhen 518033, China |
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Abstract Biological activated carbon (BAC) used for about 10years was collected from drinking water treatment plant. The filtration resistance and performance of the aged BAC filter were investigated. The ageing of BAC produced a lot of small BAC particles. The small particles deposited on the surface of the BAC column after backwash and formed a dense filtration layer. The specific resistance of the dense filtration layer was 22 times higher than that of the deep layer of the aged BAC column. Enhanced backwash only decreased the initial filtration resistance and the removal of the dense filtration layer was the most effective method to reduce the filtration resistance. Enhanced backwash had no significant effect on the performance of the aged BAC column. The removal efficiency of the total organic carbon decreased from 24.71% to 7.04% after the removal of the dense filtration layer. However, the removal efficiencies of UV254 and particle count larger than 2μm did not change greatly and the values were nearly the same as those of the control group. There are several methods to increase the life cycle of the aged BAC, including decreasing the backwashing strength and prolonging the filtration cycle.
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Received: 07 December 2015
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