Abstract
In this paper, we investigated the membrane fouling mechanism according to the coagulant dosage in algal rich water using a ceramic membrane. The algae that were used in this experiment were Microcystis sp. of cyanobacteria, and the fouling mechanism was analyzed through irrigation and filtration resistance through a constant flow operation. The experimental results showed that the filtration resistance decreased as the coagulant dosage increased, but the irreversibility at above optimum coagulant dosage increased. Additionally, as the coagulant dosage increased, the resistance value due to cake and adsorption contamination decreased, and membrane fouling by adsorption was dominant in comparison with cake fouling and adsorption fouling. The specific cake resistance was decreased as the coagulant dosage increased. The characteristics of the cake layer according to the coagulant dosage were found to loosely form the cake layer by increasing micro-size algae as the coagulant dosage increased. The results of this experiment confirmed the membrane fouling mechanism according to coagulant dosage when the ceramic membrane filtered algal rich water.
Highlights
It is expected that global climate changes due to global warming will bring environmental changes that are different from the past
This paper examined membrane fouling according to coagulant dosage using raw water that was sampled from the lake where algae occurred
This study was performed to understand the cake properties of algae particles that were attached to the membrane surface under various coagulation conditions
Summary
It is expected that global climate changes due to global warming will bring environmental changes that are different from the past. The occurrence of algal blooms causes serious problems in conventional water treatment processes, including coagulation, flotation, filtration, and disinfection and eventually causes undrinkable water. Low pressure membrane filtration, such as ultra filtration (UF) and micro filtration (MF), has attracted increasing attention from algal rich water treatment areas because of the higher production of treated water and the lower operating costs. It has been reported that algal cells, including similar substances, such as polysaccharides, proteins, lipids, and humus mainly cause membrane fouling of algae-rich water [4]. The forms of membrane fouling include adsorption or gelation between algal particles and the membrane surface and formation of pore blockage or cake layers [5]
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