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DOI : 10.17640/KSWST.2020.28.6.13 , Vol.28, No.6, 13 ~ 21, 2020
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| Title |
| Reduction of Particulate Matter in a Deep Bed GAC/sand Process |
| 백영애 Baek Youngae , 조우현 Joe Woohyun , 이광제 Lee Kwangjae , 홍숭희 Hong Seounghee , 박현 Park Hyeon |
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| Abstract |
| A water purification plant does not have a filter-to-waste valve, and the lack of free space makes the installation of such a valve difficult. In this study, we tried to reduce particulate matter by laying sand under the activated carbon without installing additional facilities. As a result of laying the lower sand to reduce the leakage of granular activated carbon, it was possible to reduce the particulate matter by about 15-20 % compared to the granular activated carbon process alone. The operating head rose about 10-20 cm when sand was laid, but there was no sharp rise and it was considered to be acceptable on site. In addition, the bacterial activity in the granular activated carbon column immediately after backwashing was detected at a maximum of about 120 per 100 mL. Despite the low water temperature (below 15℃), bacteria that are uncommon in the sand-filtered water proliferate and act as biological activated carbon in the granular activated carbon process, but it was found that it decreased by about 20% when sand was laid under the activated carbon. Regarding backwashing, it was confirmed that the activated carbon and sand layers were well mixed during air washing and then well separated again during rinsing due to the difference in specific gravity between the activated carbon and sand. A result of this study is that, in order to reduce leakage particles from granular activated carbon, it is recommended to use sand with a commercially available sand size of 0.55-0.6 mm (uniformity coefficient of 1.4 or less) when laying sand under granular activated carbon with an effective size of 0.65 mm. |
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| Key Words |
| Backwashing, Bacterial activity, Filter to waste, Granular activated carbon, Operating head, Particulate matter, Uniformity coefficient, 역세척, 생물활성도, 시동방수, 입상활성탄, 운영수두, 입자물질, 균등계수 |
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