Anaerobic co-digestion of acetate-rich with lignin-rich wastewater and the effect of hydrotalcite addition

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  • BarcelonaTech

Abstract

The methane potential and biodegradability of different ratios of acetate and lignin-rich effluents from a neutral sulfite semi-chemical (NSSC) pulp mill were investigated. Results showed ultimate methane yields up to 333 ± 5 mL CH4/gCOD when only acetate-rich substrate was added and subsequently lower methane potentials of 192 ± 4 mL CH4/gCOD when the lignin fraction was increased. The presence of lignin showed a linear decay in methane production, resulting in a 41% decrease in methane when the lignin-rich feed had a 30% increase. A negative linear correlation between lignin content and biodegradability was also observed. Furthermore, the effect of hydrotalcite (HT) addition was evaluated and showed increase in methane potential of up to 8%, a faster production rate and higher soluble lignin removal (7-12% higher). Chemical oxygen demand (COD) removal efficiencies between 64 and 83% were obtained for all samples.

Details

Original languageEnglish
Pages (from-to)84-91
Number of pages8
JournalBioresource Technology
Volume218
Publication statusPublished - 1 Oct 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Co-digestion, Evaporator condensate, Hydrotalcite, Lignin, Methane potential

ID: 6597131