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Water 2018, 10(3), 238; https://doi.org/10.3390/w10030238

Influence of the Backwash Cleaning Water Temperature on the Membrane Performance in a Pilot SMBR Unit

1
Department of Chemical Science, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou St., 15780, Athens, Greece
2
Department of Water Resources and Environmental Engineering, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., 15780, Athens, Greece
*
Author to whom correspondence should be addressed.
Received: 5 January 2018 / Revised: 22 February 2018 / Accepted: 22 February 2018 / Published: 25 February 2018
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Abstract

In this work, different backwash (BW) schemes were applied on identical hollow fiber (HF) membranes in a membrane bioreactor (MBR) treating municipal wastewater. The effect of BW duration (1 min, 3 min and 8 min) and water temperature (8 °C, 18 °C, 28 °C and 38 °C) on membrane fouling were investigated. Specifically, the transmembrane pressure (TMP) drop and the membrane permeability increase caused by the BW was investigated. Furthermore, the time required for the membrane to return to the state just before each BW experiment, was also examined. It was found that membranes presented better operating performance, as the BW temperature and the backwash duration were increased. Specifically, for 1 min backwash duration at the BW temperatures of 8 °C, 18 °C, 28 °C and 38 °C, TMP decreased by 7.1%, 8.7%, 11.2% and 14.2% respectively. For 8 min BW duration at 8 °C, 18 °C, 28 °C and 38 °C, TMP values decreased by 12%, 17.5%, 23.7% and 30.2% respectively. Increased BW water temperature and duration also improved the membrane permeability. Using higher BW water temperatures, more hours were required to return the membranes to the condition just before cleaning. The selected BW water temperatures did not adversely affect the permeate quality. View Full-Text
Keywords: Membrane Bioreactor; hollow fiber membranes; TMP; backwash duration; temperature; membrane fouling Membrane Bioreactor; hollow fiber membranes; TMP; backwash duration; temperature; membrane fouling
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Lintzos, L.; Chatzikonstantinou, K.; Tzamtzis, N.; Malamis, S. Influence of the Backwash Cleaning Water Temperature on the Membrane Performance in a Pilot SMBR Unit. Water 2018, 10, 238.

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