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

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ID: 25521
2019
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Ranked #32 of 69 articles by views in water science and technology : a journal of the international association on water pollution research

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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 CaCO 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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feldman2019assessingwater Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Feldman, H;Flores-Alsina, X;Ramin, P;Kjellberg, K;Jeppsson, U;Batstone, D J;Gernaey, K V;
Journal water science and technology : a journal of the international association on water pollution research
Year 2019
DOI
10.2166/wst.2019.129
URL
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