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Membranes
Volume 11
Issue 12
10.3390/membranes11120964
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Article

Applicability of a Combined DAF-MF Process to Respond to Changes in Reservoir Water Quality through a Two-Year Pilot Plant Operation

by
Joon-seok Kang
1,
Jayeong Seong
1,
Jewan Yoo
1,
Pooreum Kim
1,
Kitae Park
1,
Jaekyu Lee
2,
Jihoon Cheon
2,
Hyungsoo Kim
1,* and
Sangyoup Lee
1,*
1
Graduate School of Water Resources, Sungkyunkwan University, Suwon 16149, Korea
2
Toray Advanced Materials Korea Inc., Seoul 07790, Korea
*
Authors to whom correspondence should be addressed.
Membranes 2021, 11(12), 964; https://doi.org/10.3390/membranes11120964
Submission received: 2 November 2021 / Revised: 30 November 2021 / Accepted: 3 December 2021 / Published: 7 December 2021
(This article belongs to the Special Issue Advanced Membrane Technologies for Water and Wastewater Treatment)
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Abstract

The optimal operating conditions of a combined dissolved air flotation (DAF)-microfiltration (MF) process to respond to changes in raw water quality were investigated by operating a pilot plant for two years. Without DAF pre-treatment (i.e., MF alone), MF operated stably with a transmembrane pressure (TMP) increase of 0.24 kPa/d when the turbidity of raw water was low and stable (max. 13.4 NTU). However, as the raw water quality deteriorated (max. 76.9 NTU), the rate of TMP increase reached 43.5 kPa/d. When DAF pre-treatment was applied (i.e., the combined DAF-MF process), the MF process operated somewhat stably; however, the rate of TMP increase was relatively high (i.e., 0.64 kPa/d). Residual coagulants and small flocs were not efficiently separated by the DAF process, exacerbating membrane fouling. Based on the particle count analysis of the DAF effluent, the DAF process was optimised based on the coagulant dose and hydraulic loading rate. After optimisation, the rate of TMP increase for the MF process stabilised at 0.17 kPa/d. This study demonstrates that the combined DAF-MF process responded well to substantial changes in raw water quality. In addition, it was suggested that the DAF process must be optimised to avoid excessive membrane fouling.
Keywords: dissolved air flotation (DAF); microfiltration (MF); DAF-MF combined process; high-turbidity raw water; membrane fouling dissolved air flotation (DAF); microfiltration (MF); DAF-MF combined process; high-turbidity raw water; membrane fouling

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MDPI and ACS Style

Kang, J.-s.; Seong, J.; Yoo, J.; Kim, P.; Park, K.; Lee, J.; Cheon, J.; Kim, H.; Lee, S. Applicability of a Combined DAF-MF Process to Respond to Changes in Reservoir Water Quality through a Two-Year Pilot Plant Operation. Membranes 2021, 11, 964. https://doi.org/10.3390/membranes11120964

AMA Style

Kang J-s, Seong J, Yoo J, Kim P, Park K, Lee J, Cheon J, Kim H, Lee S. Applicability of a Combined DAF-MF Process to Respond to Changes in Reservoir Water Quality through a Two-Year Pilot Plant Operation. Membranes. 2021; 11(12):964. https://doi.org/10.3390/membranes11120964

Chicago/Turabian Style

Kang, Joon-seok, Jayeong Seong, Jewan Yoo, Pooreum Kim, Kitae Park, Jaekyu Lee, Jihoon Cheon, Hyungsoo Kim, and Sangyoup Lee. 2021. "Applicability of a Combined DAF-MF Process to Respond to Changes in Reservoir Water Quality through a Two-Year Pilot Plant Operation" Membranes 11, no. 12: 964. https://doi.org/10.3390/membranes11120964

APA Style

Kang, J.-s., Seong, J., Yoo, J., Kim, P., Park, K., Lee, J., Cheon, J., Kim, H., & Lee, S. (2021). Applicability of a Combined DAF-MF Process to Respond to Changes in Reservoir Water Quality through a Two-Year Pilot Plant Operation. Membranes, 11(12), 964. https://doi.org/10.3390/membranes11120964

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