Next Article in Journal
Pilot–Scale Production of Carbon Hollow Fiber Membranes from Regenerated Cellulose Precursor-Part I: Optimal Conditions for Precursor Preparation
Previous Article in Journal
Optimization of Detergent-Mediated Reconstitution of Influenza A M2 Protein into Proteoliposomes
Previous Article in Special Issue
Long-Term Performance of a Full-Scale Membrane Plant for Landfill Leachate Pretreatment: A Case Study
Article Menu

Export Article

Open AccessArticle
Membranes 2018, 8(4), 104; https://doi.org/10.3390/membranes8040104

The Impact of Mechanically-Imposed Shear on Clogging, Fouling and Energy Demand for an Immersed Membrane Bioreactor

1
Gas Processing Center, Qatar University, Doha, Qatar
2
Cranfield Water Science Institute, Cranfield Univeristy, Cranfield, Bedford MK43 0AL, UK
3
Department of Chemical Engineering, Qatar University, Doha, Qatar
*
Author to whom correspondence should be addressed.
Received: 31 August 2018 / Revised: 21 October 2018 / Accepted: 7 November 2018 / Published: 10 November 2018
(This article belongs to the Special Issue Membrane Bioreactor (MBR) Technology for Wastewater Treatment)
Full-Text   |   PDF [1856 KB, uploaded 17 November 2018]   |  

Abstract

The impact of the application of mechanically-imposed shear on the propensity for fouling and clogging (or “sludging”—the agglomeration of sludge solids in the membrane channel) of an immersed flat sheet (iFS) membrane bioreactor (MBR) was studied. The bench-scale test cell used contained a single flat sheet fitted with a crank and motor to allow the membrane to be oscillated (or reciprocated) vertically at a low rate (20 RPM). The membrane was challenged with sludge samples from a local MBR installation treating petroleum industry effluent, the sludge having previously been demonstrated as having a high sludging propensity. Sludging was measured by direct visual observation of membrane surface occlusion by the agglomerated solids, with fouling being notionally represented by the rate of transmembrane pressure increase. Results demonstrated membrane reciprocation to have a more beneficial impact on sludging amelioration than on suppressing fouling. Compared with the stationary membrane, sludging was reduced by an average of 45% compared with only 13% for fouling suppression at the reference flux of 15 L·m−2·h−1 applied. The specific energy demand of the mechanical shear application was calculated as being around 0.0081 kWh·m−3, significantly lower than values reported from a recent pilot scale study on a reciprocated immersed hollow fibre MBR. Whilst results appear promising in terms of energy efficiency, it is likely that the mechanical complexity of applying membrane movement would limit the practical application to low flows, and a correspondingly small number of membrane modules. View Full-Text
Keywords: membrane bioreactor; fouling; clogging; mechanical shear; specific energy demand membrane bioreactor; fouling; clogging; mechanical shear; specific energy demand
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Judd, S.; Odai, A.; Buzatu, P.; Qiblawey, H. The Impact of Mechanically-Imposed Shear on Clogging, Fouling and Energy Demand for an Immersed Membrane Bioreactor. Membranes 2018, 8, 104.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Membranes EISSN 2077-0375 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top