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Biofilm formation during the start-up period of an anaerobic biofilm reactor—Impact of nutrient complementation

Paper ID Volume ID Publish Year Pages File Format Full-Text
4923 258 2006 8 PDF Available
Title
Biofilm formation during the start-up period of an anaerobic biofilm reactor—Impact of nutrient complementation
Abstract

This study proposes an approach to understand biofilm formation in polyphasic anaerobic digestion systems. The objective was to better control biofilm formation in order to reduce the time of colonization during the start-up phase of an anaerobic high-rate biofilm reactor.A three-phase (liquid–gas–solid) inverse turbulent bed reactor (ITBR), with low-density particles used as biomass carrier, was started by stepwise increase of the organic loading rate (OLR) from 0.5 to 20 gCOD L−1 day−1 while maintaining a COD removal rate of 80%. The reactor was operated at a short and constant hydraulic retention time to favor biofilm accumulation.Biofilm formation and reactor performance have been followed for 90 days. In the initial phase, a COD removal of more than 90% was observed, together with continuous biofilm growth. Thereafter, at a loading rate of 6 gCOD L−1 day−1, the reactor efficiency suddenly deteriorated, volatile fatty acids (VFA) accumulated in the effluent and the specific methanogenic activity of the biofilm dropped down.This phenomenon was due to a micronutrient limitation, especially cobalt and nickel. After complementation with a mineral solution, optimal methanogenic activity and COD removal were restored. The nutrient supplementation was required to keep on increasing the OLR until the reactor reached a volumetric organic loading rate of 20 gCOD L−1 day−1 with more than 90% of carbon removal efficiency.

Keywords
Wastewater treatment; Biofilms; Anaerobic process; Fluidization; Nutrient complementation; Start-up
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Biofilm formation during the start-up period of an anaerobic biofilm reactor—Impact of nutrient complementation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 30, Issue 1, 1 May 2006, Pages 55–62
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us