Performance evaluation of a small scale digester for achieving decentralised

Journal article


Gonzalez, R., Hernandez, E., Gomez, X., Smith, R., Gonzales Arias, J., Elias Martínez, J. and Blanco, D. 2020. Performance evaluation of a small scale digester for achieving decentralised. Waste Management. 118, pp. 99-109. https://doi.org/10.1016/j.wasman.2020.08.020
AuthorsGonzalez, R., Hernandez, E., Gomez, X., Smith, R., Gonzales Arias, J., Elias Martínez, J. and Blanco, D.
Abstract

The performance of a small-scale prototype digestion plant (7.2 m3 working volume) intended for decentralised operation was evaluated considering energy efficiency and technical suitability for biogas valorisation in producing electrical and thermal energy. The digester operated in recirculation mode to enhance organic matter conversion and improve volatile solid degradation. An energy assessment of the process assumed the incorporation of a combined heat and power (CHP) unit. The coefficient of overall performance of the plant for electrical energy (COPel) was 0.95 — this values was estimated at an electrical efficiency of 22.5% and represents the ratio between energy production and consumption — for a methane yield of 360 L/kg VS and an organic loading rate (OLR) of 1.06 g VS/L d. This parameter was slightly lower than the unit thus indicating that the micro-plant was close to attaining self-sufficiency regarding electrical energy use. The temperature increase of the feed to process conditions supposed a significant amount of thermal energy which highly compromised the efficiency when operating at low organic load, thus accounting for more than 80% of the total energy demand of the installation. When the energy assessment of the process was performed at higher OLR of 2.7 g VS/ L d, the resulting COPel value was1.68, demonstrating the feasibility of this configuration for decentralised digestion.

KeywordsMicro-plant energy performance; Food waste digestion; Decentralised waste treatment; Prototype evaluation; Anaerobic digestion
Year2020
JournalWaste Management
Journal citation118, pp. 99-109
PublisherElsevier
ISSN0956-053X
Digital Object Identifier (DOI)https://doi.org/10.1016/j.wasman.2020.08.020
Official URLhttps://doi.org/10.1016/j.wasman.2020.08.020
Publication dates
Online03 Sep 2020
Publication process dates
Accepted15 Aug 2020
Deposited23 Nov 2020
Accepted author manuscript
License
Output statusPublished
Permalink -

https://repository.canterbury.ac.uk/item/8wv8z/performance-evaluation-of-a-small-scale-digester-for-achieving-decentralised

Restricted files

Accepted author manuscript

  • 4
    total views
  • 0
    total downloads
  • 1
    views this month
  • 0
    downloads this month

Export as

Related outputs

Dry weight model, capacitance and metabolic data as indicators of fungal biomass growth in solid state fermentation
Botella, Carolina, Hernandez, J.E. and Webb, Colin 2019. Dry weight model, capacitance and metabolic data as indicators of fungal biomass growth in solid state fermentation. Food and Bioproducts Processing. 114, pp. 144-153. https://doi.org/10.1016/j.fbp.2018.12.002
Toxicity and biodegradability of caffeic acid in anaerobic digesting sludge
Hernandez, E. and Edyvean, R.G.J. 2018. Toxicity and biodegradability of caffeic acid in anaerobic digesting sludge. Water SA. 44 (1). https://doi.org/10.4314/wsa.v44i1.04
Conceptualization, modelling and environmental impact assessment of a natural rubber techno-ecological system with nutrient, water and energy integration
Martinez-Hernandez, E. and Hernandez, E. 2018. Conceptualization, modelling and environmental impact assessment of a natural rubber techno-ecological system with nutrient, water and energy integration. Journal of Cleaner Production. 185, pp. 707-722. https://doi.org/10.1016/j.jclepro.2018.02.297
New DNA sequences from bacteria converting phenol into acetate under strict anaerobic conditions
Hernandez, E. and Edyvean, R. 2016. New DNA sequences from bacteria converting phenol into acetate under strict anaerobic conditions. Journal of Medical and Bioengineering. 5 (1), pp. 1-10. https://doi.org/10.12720/jomb.5.1.1-10
A novel process for enhancing oil production in algae biorefineries through bioconversion of solid by-products
Hernandez, E., Colin, W. and Trzcinski, A. 2012. A novel process for enhancing oil production in algae biorefineries through bioconversion of solid by-products. Bioresource Technology. 116, pp. 295-301. https://doi.org/10.1016/j.biortech.2012.03.078