Enhancement of sludge granulation in hydrolytic acidogenesis by denitrification.

Abstract:

:Acidogenesis is an important pretreatment process for various industrial wastewater treatments. Granular sludge is an efficient form of a microbial community in anaerobic methanogenic reactors, such as upflow anaerobic sludge blanket (UASB), but it is hard to develop in the acidogenic process due to the short hydraulic retention times (HRTs) of acidogenesis. In this study, nitrate was added into an acidogenic reactor as an electron acceptor to enhance electron exchange between acidogenic and denitrifying bacteria to accelerate sludge growth in the acidogenesis process. The results showed that it developed solid and mature granular sludge with a mean size of 410 ± 35 μm over 84 days of operation. Comparatively, the sludge in a no-nitrate acidogenic reactor showed a flocculent appearance with a mean size of 110 ± 18 μm. Analysis of the microbial community indicated that denitrifying bacteria interwoven with propionate-oxidizing bacteria were distributed in the outer granule layer, which provided an ideal shield for susceptible microorganisms inside the granules. This microbial structure was favorable for the development of granular sludge and made the system possible to respond well to shocks in the operation.

authors

Li Y,Zhang Y,Zhao Z,Sun S,Quan X,Zhao H

doi

10.1007/s00253-015-7194-9

subject

Has Abstract

pub_date

2016-04-01 00:00:00

pages

3313-20

issue

7

eissn

0175-7598

issn

1432-0614

pii

10.1007/s00253-015-7194-9

journal_volume

100

pub_type

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