The role of fouling mechanisms in a membrane bioreactor

Author:

Di Bella G.1,Durante F.1,Torregrossa M.1,Viviani G.1,Mercurio P.2,Cicala A.2

Affiliation:

1. Dipartimento di Ingegneria Idraulica ed Applicazioni Ambientali dell'Università di Palermo, Viale delle Scienze 90146, Palermo, Italy

2. AMAP S.p.A., Via Volturno 2, Palermo, Italy

Abstract

The present study has aimed to quantify the role of pore blocking and cake layer in a laboratory scale hollow fibre membrane module in submerged configuration. The membrane reactor (MBR) was fed with raw wastewater, only screened with a 2-mm sieve, collected from the Palermo WWTP. The MBR was characterised by an operating volume of 190 L and equipped with an aeration system located on the bottom of the reactor. The MBR operated for 65 days. The permeate was extracted by imposing a constant flux through the membrane (21 Lh−1m−2). The results confirm the importance of pore blocking control during start-up. In particular, it provides a rapid irreversible fouling that takes place at the beginning of the filtration process, before the deposition mechanism. Therefore, low suspended solids concentration in the initial phase causes a fast irreversible fouling. This circumstance creates the need for more frequent chemical cleaning after start-up without inoculum. Finally, the results underline that the cake has a mainly reversible feature.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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