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Biofilm and granular systems to improve Anammox biomass retention

Paper ID Volume ID Publish Year Pages File Format Full-Text
4340 221 2008 6 PDF Available
Title
Biofilm and granular systems to improve Anammox biomass retention
Abstract

Appropriate biomass retention in reactors is a crucial factor for the accurate operation of the anaerobic ammonium oxidation (Anammox) process due to the slow growth rate of this bacterial population. In the present work two different approaches were studied and compared to improve Anammox biomass retention minimizing wash-out events: (1) formation of granular biomass using influents with high inorganic salts concentrations by production of saline precipitates acting as promoters for biomass aggregation (reactor SBR1); (2) use of zeolite particles as carrier material for Anammox biofilm formation (reactor SBR2). Both alternatives allowed the reduction of biomass wash-out in the effluent to values as low as 18 mg VSS L−1 (SBR1) and 3 mg VSS L−1 (SBR2). As a consequence the biomass concentration increased significantly inside each reactor. In the case of the SBR2 the specific Anammox activity (SAA) of the biomass was also enhanced increasing from 0.35 up to 0.5 g N (g VSS d)−1. Both approaches allow the improvement of the biomass retention, the first option indicating the suitability of the Anammox process to treat wastewaters with high salt content. The second one with zeolite particles could be a good strategy to apply the Anammox process to low salinity wastewaters.

Keywords
Adsorption; Anaerobic processes; Anammox; Chemoautotrophs; Salinity; Wastewater treatment
First Page Preview
Biofilm and granular systems to improve Anammox biomass retention
Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 42, Issue 3, 1 December 2008, Pages 308–313
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering