The impact of different operating conditions on membrane fouling and EPS production

• Published in: Bioresource technology Vol. 102; no. 13; pp. 6870 - 6875
• Main Authors: Dvořák, Lukáš, Gómez, Marcel, Dvořáková, Markéta, Růžičková, Iveta, Wanner, Jiří
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-07-2011; Elsevier
• Subjects: Activated sludge; Biofouling; Biological and medical sciences; Biological Oxygen Demand Analysis; Biopolymers - biosynthesis; Bioreactors; Biotechnology; Carbohydrates; Effluents; EPS; Extracellular polymeric substances (EPS); Extracellular Space - chemistry; Fouling; Fundamental and applied biological sciences. Psychology; Hollow fiber; Kinetics; Membrane bioreactor; Membranes; Membranes, Artificial; Methods. Procedures. Technologies; Pilot plants; Pilot Projects; Pressure; Quaternary Ammonium Compounds - analysis; Solubility; Soluble microbial products (SMP); Various methods and equipments; Waste Disposal, Fluid - methods; Waste water; SS; Membrane bioreactor; C; Extracellular polymeric substances (EPS); Fouling; F/M; EPS; HRT; HS; P; Soluble microbial products (SMP); PAC; SRT; TMP; MLVSS; SMP; VSS; Hollow fiber; COD; MLSS; Solubility; Polymer; Extracellular; Operating conditions; Membrane reactor; Bioreactor; Membrane; Microorganism
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2011.04.061

► Two pilot plants with submerged membranes were operated for several months. ► The hollow fiber was more influenced by wastewater pretreatment than flat sheet. ► Carbohydrates were identified as the main compound of EPS affecting the MBR fouling. ► The raw wastewater interruption led to the decrease of activated sludge activity. ► Changes in flux and TMP were not noticeable.
The main goal of this research was to investigate how different factors influence membrane fouling. The impact of the different concentrations of activated sludge and the amount of extracellular polymer substances (EPS) were monitored. Two pilot plants with submerged membrane modules (hollow fiber and flat sheet) were operated and the raw wastewater was used.
Humic substances were identified as the major components of EPS in the activated sludge (more than 34%) in both pilot plants. As the basic constituent in permeate, humic substances were identified as the most dominant components in the effluent (61%) in both pilot plants. Conversely, proteins were mostly analyzed in permeate and supernatant below the detection limit. The total amount of EPS [mg
g
−1 (VSS)] was similar for concentrations of activated sludge 6, 10 and 14
g
L
−1. Carbohydrates were identified as the component of EPS which tends most to clog membranes.