Modelling mono-digestion of grass silage in a 2-stage CSTR anaerobic digester using ADM1.

This paper examines 174 days of experimental data and modelling of mono-digestion of grass silage in a two stage wet process with recirculation of liquor; the two vessels have an effective volume of 312 L each. The organic loading rate is initiated at 0.5 kg VS m(-3) d(-1) (first 74 days) and subsequently increased to 1 kg VS m(-3) d(-1). The experimental data was used to generate a mathematical model (ADM1) which was calibrated over the first 74 days of operation. Good accuracy with experimental data was found for the subsequent 100 days. Results of the model would suggest starting the process without recirculation and thus building up the solids content of the liquor. As the level of VFA increases, recirculation should be employed to control VFA. Recirculation also controls solids content and pH. Methane production was estimated at 88% of maximum theoretical production.

[1]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[2]  C. Walla,et al.  Farm biogas plants in Austria - an economic analysis. , 2003 .

[3]  F. Blumensaat,et al.  Modelling of two-stage anaerobic digestion using the IWA Anaerobic Digestion Model No. 1 (ADM1). , 2005, Water research.

[4]  T. Thamsiriroj,et al.  Difficulties Associated with Monodigestion of Grass as Exemplified by Commissioning a Pilot-Scale Digester , 2010 .

[5]  Ulf Jeppsson,et al.  Aspects on ADM1 Implementation within the BSM2 Framework , 2005 .

[6]  J. M. Owens,et al.  Renewable methane from anaerobic digestion of biomass , 1997 .

[7]  J. C. Converse,et al.  Improved alkalimetric monitoring for anaerobic digestion of high-strength wastes , 1986 .

[8]  Jerry D. Murphy,et al.  What type of digester configurations should be employed to produce biomethane from grass silage , 2010 .

[9]  J. Mata-Álvarez,et al.  Modified version of ADM1 model for agro-waste application. , 2009, Bioresource technology.

[10]  Monika Heiermann,et al.  Seasonal Pattern of Biomethanisation of Grass from Landscape Management , 2005 .

[11]  Fezzani Boubaker,et al.  Modelling of the mesophilic anaerobic co-digestion of olive mill wastewater with olive mill solid waste using anaerobic digestion model No. 1 (ADM1). , 2008, Bioresource technology.

[12]  Manfred Lübken,et al.  Monofermentation of grass silage under mesophilic conditions: measurements and mathematical modeling with ADM 1. , 2009, Bioresource technology.

[13]  D Vrecko,et al.  Implementing ADM1 for plant-wide benchmark simulations in Matlab/Simulink. , 2006, Water science and technology : a journal of the International Association on Water Pollution Research.

[14]  Manfred Lübken,et al.  Modelling the energy balance of an anaerobic digester fed with cattle manure and renewable energy crops. , 2007, Water research.

[15]  Gerasimos Lyberatos,et al.  MODELLING OF ANAEROBIC DIGESTION - A REVIEW , 1999 .

[16]  J. Azevedo,et al.  Estimating the higher heating value of biomass fuels from basic analysis data , 2005 .

[17]  Zhaobo Chen,et al.  Modeling of two-phase anaerobic process treating traditional Chinese medicine wastewater with the IWA Anaerobic Digestion Model No. 1. , 2009, Bioresource technology.

[18]  Nicholas E. Korres,et al.  Review of the integrated process for the production of grass biomethane. , 2009, Environmental science & technology.