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The prediction and recovery of the flux of PVDF membrane during dead‐end microfiltration
Author(s) -
Zhou Yuenan,
Zhu Zhongya,
Wang Zhan,
Zhang Ximing,
Gao Kui,
Liu Liping,
Cheng Lina
Publication year - 2016
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4688
Subject(s) - microfiltration , fouling , flux (metallurgy) , filtration (mathematics) , membrane fouling , sodium hydroxide , dead end , sodium hypochlorite , membrane , chemistry , chemical engineering , chromatography , environmental engineering , materials science , pulp and paper industry , environmental science , mechanics , engineering , biochemistry , statistics , mathematics , flow (mathematics) , organic chemistry , physics
Abstract BACKGROUND This research focused on the fouling behavior of 0.1 µm PVDF membrane caused by activated sludge suspension in dead‐end filtration mode and the chemical cleaning of the fouled PVDF membrane by alkaline solutions. A combined intermediate pore blockage and cake filtration model was established to describe flux decline behavior. A series of experiments were performed to validate the proposed model and to explore the impacts of operating conditions on flux decline and recovery. RESULTS Flux decline was much faster with increasing transmembrane pressure ( TMP ) and concentration of mixed liquor suspended solids ( MLSS ). The proposed model predictions in this paper showed good agreement with the experimental data. The cleaning effect of sodium hypochlorite solution was superior to that of sodium hydroxide solution. Temperature was the dominant factor affecting flux recovery in the cleaning operation and the optimum chemical cleaning operating conditions were as follows: C NaOCl = 1%, r = 300 rpm, t = 30 min, T = 318 K. CONCLUSIONS The combined model was valid in predicting the flux decline process and more accurate than classical fouling models under the same operating conditions. Flux recovery was significantly improved under optimized cleaning conditions. © 2015 Society of Chemical Industry