Journal
BIORESOURCE TECHNOLOGY
Volume 114, Issue -, Pages 247-254Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.03.085
Keywords
Critical flux; Gas sparging; Industrial hollow-fibre membranes; Modified flux-step method; Submerged anaerobic membrane bioreactor
Funding
- Spanish Research Foundation (CICYT) [CTM2008-06809-C02-01, CTM2008-06809-C02-02, BES-2009-023712]
- Generalitat Valenciana [GVA-ACOMP2010/130, GVA-ACOMP2011/182]
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A submerged anaerobic MBR demonstration plant with two commercial hollow-fibre ultrafiltration systems (PURON (R), Koch Membrane Systems, PUR-PSH31) was operated using municipal wastewater at high levels of mixed liquor total solids (MLTS) (above 22 gL(-1)). A modified flux-step method was applied to assess the critical flux (J(C)) at different gas sparging intensities. The results showed a linear dependency between J(C) and the specific gas demand per unit of membrane area (SGD(m)). J(C) ranged from 12 to 19 LMH at SGD(m) values of between 0.17 and 0.5 Nm(3)h(-1) m(-2), which are quite low in comparison to aerobic MBR. Long-term trials showed that the membranes operated steadily at fluxes close to the estimated J(C), which validates the J(C) obtained by this method. After operating the membrane for almost 2 years at sub-critical levels, no irreversible fouling problems were detected, and therefore, no chemical cleaning was conducted. (C) 2012 Elsevier Ltd. All rights reserved.
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