Performances and fouling control of a flat sheet membrane in a MBR pilot-plant

This paper deals with the performance and the optimisation of the hydraulic operating conditions of the A3 Water Solutions flat sheet membrane technology in a MBR pilot-plant to achieve a satisfying fouling control and also a reduction in the required aeration. Two vertically stacked modules were te...

Full description

Saved in:
Bibliographic Details
Published in:Water science and technology 2010-01, Vol.61 (9), p.2185-2192
Main Authors: Grélot, A, Grelier, P, Tazi-Pain, A, Lesjean, B, Brüss, U, Grasmick, A
Format: Article
Language:English
Subjects:
Aeration
Air flow
Ammonia
Biological effects
Biological stress
Bioreactors
Chemical oxygen demand
Chemical Sciences
Decks
Filtration - instrumentation
Filtration - methods
Foaming
Fouling
Fouling control
Hydraulics
Liquor
Membranes
Membranes, Artificial
Nitrates
Operating costs
Pain
Pilot Projects
Retention time
Sludge
Solutions
Stress (physiology)
Suspended particulate matter
Suspended solids
Technology
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Water - chemistry
Water Pollutants, Chemical
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper deals with the performance and the optimisation of the hydraulic operating conditions of the A3 Water Solutions flat sheet membrane technology in a MBR pilot-plant to achieve a satisfying fouling control and also a reduction in the required aeration. Two vertically stacked modules were tested at pilot-scale at Anjou Recherche under typical biological operating conditions (mixed liquor suspended solids concentration (MLSS) =10 g/l; sludge retention time (SRT) =28 days; food to microorganism ratio (F/M)=0.12 kg COD/kg MLSS/d). The use of a double-deck and of specific backwashes for this membrane technology enabled to achieve satisfying membrane performances for a net flux of 25 L h(-1) m(-2), 20 degrees C at a low specific aeration demand per membrane surface (SADm = 0.2 Nm(3) h(-1) m(-2)) which corresponds to a specific aeration demand per permeate volume unit (SADp) of 8 Nm(3) air/m(3) permeate, which is lower than reported for many commercial membrane systems. The mixed liquor characteristics (foaming, MLSS concentration) appeared to influence the fouling behaviour of the membranes but no correlation was found with the fouling rate. However, with the new operating conditions, the system is robust and can cope with fouling resulting from biological stress and daily peak flows for MLSS concentrations in the membrane tank up to 18 g/l.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2010.127