Effect of Hydraulic Loading Rate on Acidogenesis in a Membrane-Coupled Anaerobic VFAs Fermenter

A membrane-coupled anaerobic VFAs fermenter (MCAVF) was operated with five different hydraulic loading rates (3, 2, 1, 0.5 and 0.25 day −1 ) to evaluate its influence on acid phase VFAs production from coagulated raw sludge. Results show that C 2 to C 5 volatile fatty acids were formed as predominan...

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Bibliographic Details
Published in:Environmental technology 2001-01, Vol.22 (1), p.91-99
Main Authors: Kim, J.-O., Somiya, I.
Format: Article
Language:English
Subjects:
acidogenesis
Acids - chemistry
Applied sciences
Biological and medical sciences
Biological treatment of waters
Biotechnology
Chemical Phenomena
Chemistry, Physical
coagulated raw sludge
Environment and pollution
Exact sciences and technology
Fatty Acids, Volatile - metabolism
Fermentation
Fundamental and applied biological sciences. Psychology
General purification processes
Hydraulic loading rate
Hydrogen-Ion Concentration
Hydrolysis
Industrial applications and implications. Economical aspects
Kinetics
membrane-coupled anaerobic VFAs fermenter
Pollution
Sewage - chemistry
volatile fatty acids (VFAs)
Wastewaters
Water treatment and pollution
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Summary:A membrane-coupled anaerobic VFAs fermenter (MCAVF) was operated with five different hydraulic loading rates (3, 2, 1, 0.5 and 0.25 day −1 ) to evaluate its influence on acid phase VFAs production from coagulated raw sludge. Results show that C 2 to C 5 volatile fatty acids were formed as predominant compounds. At constant solids retention time (SRT) of 10 days, VFAs production ratio moderately increased over the range of hydraulic loading rate (HLR) of 3 day −1 to 2 day −1 , but significantly decreased at other HLR conditions. First order hydrolysis rate constant decreased with a decrease in HLR. The relatively high degradation percentages of carbohydrate and protein were observed, ranging from 25 to 47%, 27 to 47%, respectively. However, lipid and fiber component were degraded at much lower ratio than the previous other two organic materials. On the other hand, despite some variation in the minor acids in five HLR cases, VFAs speciation appeared to be independent of HLR. The results obtained emphasize that; at least in the range investigated, the optimal HLR for VFAs production and recovery from coagulated raw sludge is in the range of 2 day −1 and 1 day −1 .
ISSN:0959-3330
1479-487X
DOI:10.1080/09593332208618310