Of: A Comparison of Membrane Bioreactor and Conventional-Activated-Sludge Mixed Liquor and Biosolids Characteristics/Closure to Discussions

The authors present a valuable contribution to a better understanding of membrane bioreactor (MBR) performance, especially related to biomass properties and process operation. From a practical point of view, the claim that "the amount of sludge produced as quantified by the observed yield was d...

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Bibliographic Details
Published in:Water environment research 2006-12, Vol.78 (13), p.2524
Main Authors: Hermanowicz, S W, Trussell, R S, Merlo, R P, Jenkins, D
Format: Article
Language:English
Subjects:
Chemical oxygen demand
Membrane reactors
Sludge
Water pollution
Water treatment plants
Online Access:Get full text
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Summary:The authors present a valuable contribution to a better understanding of membrane bioreactor (MBR) performance, especially related to biomass properties and process operation. From a practical point of view, the claim that "the amount of sludge produced as quantified by the observed yield was different" for MBR and activated sludge systems is very important and warrants additional examination. Substituting the values reported in Table 1 for the activated sludge system (i.e., MCRT = 9.6 days, HRT = 7.4 hours, X = mixed liquor suspended solids [MLSS] = 1440 mg/L, FfM = 0.38 kg COD/kg MLSS . d, and S^sub out^ = 37.5 mg/L), we obtain the value K^sub obs^ = 0.35 kg SS/kg COD^sub rem^. The authors repeatedly stated that the turbulence intensity, as measured by the average velocity gradient G, "did not substantially contribute to the differences in the mixedliquor characteristics or digestion-and-dewatering behavior", while, at the same time, admitting that they did not know the value of G for their activated sludge process.
ISSN:1061-4303
1554-7531