High organic loading influences the physical characteristics of aerobic sludge granules.

Abstract:

AIMS:The effect of high organic loading rate (OLR) on the physical characteristics of aerobic granules was studied. METHODS AND RESULTS:Two column-type sequential aerobic sludge blanket reactors were fed with either glucose or acetate as the main carbon source, and the OLR was gradually raised from 6 to 9, 12 and 15 kg chemical oxygen demand (COD) m(-3) d(-1). Glucose-fed granules could sustain the maximum OLR tested. At a low OLR, these granules exhibited a loose fluffy morphology dominated by filamentous bacteria. At higher OLRs, these granules became irregularly shaped, with folds, crevices and depressions. In contrast, acetate-fed granules had a compact spherical morphology at OLRs of 6 and 9 kg COD m(-3) d(-1), with better settling and strength characteristics than glucose-fed granules at similar OLRs. However, acetate-fed granules could not sustain high OLRs and disintegrated when the OLR reached 9 kg COD m(-3) d(-1). CONCLUSIONS:The compact regular microstructure of the acetate-fed granules appeared to limit mass transfer of nutrients at an OLR of 9 kg COD m(-3) d(-1). The looser filamentous microstructure of the glucose-fed granules and the subsequent irregular morphology delayed the onset of diffusion limitation and allowed significantly higher OLRs to be attained. SIGNIFICNACE AND IMPACT OF THE STUDY: High organic loading rates are possible with aerobic granules. This research would be helpful in the development of aerobic granule-based systems for high-strength wastewaters.

journal_name

Lett Appl Microbiol

authors

Moy BY,Tay JH,Toh SK,Liu Y,Tay ST

doi

10.1046/j.1472-765x.2002.01108.x

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

407-12

issue

6

eissn

0266-8254

issn

1472-765X

pii

1108

journal_volume

34

pub_type

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