Optimizing the thermophilic hydrolysis of grass silage in a two-phase anaerobic digestion system

A. M. Orozco; A. S. Nizami; J. D. Murphy; E. Groom

doi:10.1016/j.biortech.2013.05.118

Optimizing the thermophilic hydrolysis of grass silage in a two-phase anaerobic digestion system

A. M. Orozco
, A. S. Nizami
, J. D. Murphy
, E. Groom

Research output: Contribution to journal › Article › peer-review

Abstract

Thermophilic hydrolysis of grass silage (GS) at 55°C with organic loading rates (OLRs) of 6.5, 5, 2.5 and 1.0kgVSm^-3days^-1 and hydraulic retention times (HRT) of 10, 6, 4 and 2days were evaluated in 12 glass bioreactors side by side. The hydrolytic process was measured by variation in pH, volatile solids (VS), VS destruction, soluble chemical oxygen demand (sCOD), hydrolysis and acidification yields. Biological methane potential (BMP) assays were carried out to measure the upper limit for methane production of grass silage with different hydrolytic pretreatments at mesophilic temperature (37°C). The optimum methane yield of 368L_NCH₄kg^-1VS was obtained at an OLR of 1kgVSm^-3days^-1 and a HRT of 4days, showing an increase of 30% in the methane potential in comparison to non-hydrolysed GS.

Original language	English
Pages (from-to)	117-125
Number of pages	9
Journal	Bioresource Technology
Volume	143
DOIs	https://doi.org/10.1016/j.biortech.2013.05.118
Publication status	Published - Sep 2013

Keywords

Anaerobic digestion
Biogas
Grass silage
Thermophilic hydrolysis
Two-phase anaerobic digestion

Access to Document

10.1016/j.biortech.2013.05.118

Cite this

@article{72c4e973806f47198e2ff449923a93cd,

title = "Optimizing the thermophilic hydrolysis of grass silage in a two-phase anaerobic digestion system",

abstract = "Thermophilic hydrolysis of grass silage (GS) at 55°C with organic loading rates (OLRs) of 6.5, 5, 2.5 and 1.0kgVSm-3days-1 and hydraulic retention times (HRT) of 10, 6, 4 and 2days were evaluated in 12 glass bioreactors side by side. The hydrolytic process was measured by variation in pH, volatile solids (VS), VS destruction, soluble chemical oxygen demand (sCOD), hydrolysis and acidification yields. Biological methane potential (BMP) assays were carried out to measure the upper limit for methane production of grass silage with different hydrolytic pretreatments at mesophilic temperature (37°C). The optimum methane yield of 368LNCH4kg-1VS was obtained at an OLR of 1kgVSm-3days-1 and a HRT of 4days, showing an increase of 30\% in the methane potential in comparison to non-hydrolysed GS.",

keywords = "Anaerobic digestion, Biogas, Grass silage, Thermophilic hydrolysis, Two-phase anaerobic digestion",

author = "Orozco, \{A. M.\} and Nizami, \{A. S.\} and Murphy, \{J. D.\} and E. Groom",

year = "2013",

month = sep,

doi = "10.1016/j.biortech.2013.05.118",

language = "English",

volume = "143",

pages = "117--125",

journal = "Bioresource Technology",

issn = "0960-8524",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Optimizing the thermophilic hydrolysis of grass silage in a two-phase anaerobic digestion system

AU - Orozco, A. M.

AU - Nizami, A. S.

AU - Murphy, J. D.

AU - Groom, E.

PY - 2013/9

Y1 - 2013/9

N2 - Thermophilic hydrolysis of grass silage (GS) at 55°C with organic loading rates (OLRs) of 6.5, 5, 2.5 and 1.0kgVSm-3days-1 and hydraulic retention times (HRT) of 10, 6, 4 and 2days were evaluated in 12 glass bioreactors side by side. The hydrolytic process was measured by variation in pH, volatile solids (VS), VS destruction, soluble chemical oxygen demand (sCOD), hydrolysis and acidification yields. Biological methane potential (BMP) assays were carried out to measure the upper limit for methane production of grass silage with different hydrolytic pretreatments at mesophilic temperature (37°C). The optimum methane yield of 368LNCH4kg-1VS was obtained at an OLR of 1kgVSm-3days-1 and a HRT of 4days, showing an increase of 30% in the methane potential in comparison to non-hydrolysed GS.

AB - Thermophilic hydrolysis of grass silage (GS) at 55°C with organic loading rates (OLRs) of 6.5, 5, 2.5 and 1.0kgVSm-3days-1 and hydraulic retention times (HRT) of 10, 6, 4 and 2days were evaluated in 12 glass bioreactors side by side. The hydrolytic process was measured by variation in pH, volatile solids (VS), VS destruction, soluble chemical oxygen demand (sCOD), hydrolysis and acidification yields. Biological methane potential (BMP) assays were carried out to measure the upper limit for methane production of grass silage with different hydrolytic pretreatments at mesophilic temperature (37°C). The optimum methane yield of 368LNCH4kg-1VS was obtained at an OLR of 1kgVSm-3days-1 and a HRT of 4days, showing an increase of 30% in the methane potential in comparison to non-hydrolysed GS.

KW - Anaerobic digestion

KW - Biogas

KW - Grass silage

KW - Thermophilic hydrolysis

KW - Two-phase anaerobic digestion

UR - https://www.scopus.com/pages/publications/84879433249

U2 - 10.1016/j.biortech.2013.05.118

DO - 10.1016/j.biortech.2013.05.118

M3 - Article

AN - SCOPUS:84879433249

SN - 0960-8524

VL - 143

SP - 117

EP - 125

JO - Bioresource Technology

JF - Bioresource Technology

ER -

Optimizing the thermophilic hydrolysis of grass silage in a two-phase anaerobic digestion system

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this