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Comparative assessment of raw and digested pig slurry treatment in bioelectrochemical systems

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10.1016/j.bioelechem.2016.03.004
 
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hdl:2117/116587

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Cerrillo Moreno, MíriamMés informacióMés informacióMés informació
Viñas Canals, Marc
Bonmatí Blasi, August
Oliveras, Judit
Document typeArticle
Defense date2016-08
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Both raw and anaerobically digested pig slurries were investigated in batch assays in two chambered bioelectrochemical systems (BES) run in Microbial Fuel Cell (MFC) and Microbial Electrolysis Cell (MEC) mode. Chemical Oxygen Demand (COD) removal, nitrogen recovery, cation transport and anode microbial population evolutions were assessed. The Anaerobic Digestion-MEC (AD-MEC) integrated system achieved the highest COD removal (60% in 48 h); while the maximum NH4+ removal efficiency (40%, with an ammonia flux of 8.86 g N–NH4+ d-1 m-2) was achieved in MFC mode fed with digested pig slurry in 24 h. On the other hand, the high pH (12.1) achieved in MEC mode (NaCl solution as catholyte), could favour ammonium recovery in a subsequent stripping and absorption process. Ammonia was the main cation involved in maintaining the electroneutrality between both compartments. Regarding microbial population, Desulfuromonadaceae, a known family of exoelectrogenic bacteria, was enriched under MEC mode, whereas hydrogenotrophic and methylotrophic methanogen phylotypes belonging to Thermoplasmatales were also favoured against acetotrophic Methanosaetaceae. From these results, the integration of anaerobic digestion in BES seems to be an interesting alternative for the treatment of complex substrates, since a polished effluent can be obtained and ammonium can be simultaneously recovered for further reuse as fertilizer.
CitationCerrillo, M., Viñas , M., Bonmatí, A., Oliveras, J. Comparative assessment of raw and digested pig slurry treatment in bioelectrochemical systems. "Bioelectrochemistry", Agost 2016, vol. 110, p. 68-78. 
URIhttp://hdl.handle.net/2117/116587
DOI10.1016/j.bioelechem.2016.03.004
ISSN0302-4598
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  • GREA - Grup de Recerca d'Enginyeria Agroambiental - Articles de revista [100]
  • Departament d'Enginyeria Electrònica - Articles de revista [1.531]
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