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Assessing the effects of intra-granule precipitation in a full-scale industrial anaerobic digester

Feldman, H. ; Flores-Alsina, X. ; Ramin, P. ; Kjellberg, K. ; Jeppsson, U. LU ; Batstone, D. J. LU and Gernaey, K. V. LU (2019) In Water Science and Technology 79(7). p.1327-1337
Abstract

In this paper, a multi-scale model is used to assess the multiple mineral precipitation potential in a full-scale anaerobic granular sludge system. Reactor behaviour is analysed under different operational conditions (addition/no addition of reject water from dewatering of lime-stabilized biomass) and periods of time (short/long term). Model predictions suggest that a higher contribution of reject water promotes the risk of intra-granule CaCO3 formation as a result of the increased quantity of calcium arriving with that stream combined with strong pH gradients within the biofilm. The distribution of these precipitates depends on: (i) reactor height; and (ii) granule size. The study also exposes the potential undesirable... (More)

In this paper, a multi-scale model is used to assess the multiple mineral precipitation potential in a full-scale anaerobic granular sludge system. Reactor behaviour is analysed under different operational conditions (addition/no addition of reject water from dewatering of lime-stabilized biomass) and periods of time (short/long term). Model predictions suggest that a higher contribution of reject water promotes the risk of intra-granule CaCO3 formation as a result of the increased quantity of calcium arriving with that stream combined with strong pH gradients within the biofilm. The distribution of these precipitates depends on: (i) reactor height; and (ii) granule size. The study also exposes the potential undesirable effects of the long-term addition of reject water (a decrease in energy recovery of 20% over a 100-day period), caused by loss in biomass activity (due to microbial displacement), and the reduced buffer capacity. This demonstrates how both short-term and long-term operational conditions may affect the formation of precipitates within anaerobic granules, and how it may influence methane production and consequently energy recovery.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ADM1, Biofilm, Industrial wastewater, Multiple mineral precipitation, Physico-chemical modelling, Space competition within granules
in
Water Science and Technology
volume
79
issue
7
pages
11 pages
publisher
IWA Publishing
external identifiers
  • pmid:31123232
  • scopus:85066849685
ISSN
0273-1223
DOI
10.2166/wst.2019.129
language
English
LU publication?
yes
id
11e967e9-c728-4b3a-bcb8-5b902f625fd2
date added to LUP
2019-06-19 09:53:42
date last changed
2020-10-27 04:02:02
@article{11e967e9-c728-4b3a-bcb8-5b902f625fd2,
  abstract     = {<p>In this paper, a multi-scale model is used to assess the multiple mineral precipitation potential in a full-scale anaerobic granular sludge system. Reactor behaviour is analysed under different operational conditions (addition/no addition of reject water from dewatering of lime-stabilized biomass) and periods of time (short/long term). Model predictions suggest that a higher contribution of reject water promotes the risk of intra-granule CaCO<sub>3</sub> formation as a result of the increased quantity of calcium arriving with that stream combined with strong pH gradients within the biofilm. The distribution of these precipitates depends on: (i) reactor height; and (ii) granule size. The study also exposes the potential undesirable effects of the long-term addition of reject water (a decrease in energy recovery of 20% over a 100-day period), caused by loss in biomass activity (due to microbial displacement), and the reduced buffer capacity. This demonstrates how both short-term and long-term operational conditions may affect the formation of precipitates within anaerobic granules, and how it may influence methane production and consequently energy recovery.</p>},
  author       = {Feldman, H. and Flores-Alsina, X. and Ramin, P. and Kjellberg, K. and Jeppsson, U. and Batstone, D. J. and Gernaey, K. V.},
  issn         = {0273-1223},
  language     = {eng},
  month        = {04},
  number       = {7},
  pages        = {1327--1337},
  publisher    = {IWA Publishing},
  series       = {Water Science and Technology},
  title        = {Assessing the effects of intra-granule precipitation in a full-scale industrial anaerobic digester},
  url          = {http://dx.doi.org/10.2166/wst.2019.129},
  doi          = {10.2166/wst.2019.129},
  volume       = {79},
  year         = {2019},
}