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Thermo-economic analysis of a thermophilic biogas plant integrated with membrane distillation

Ullah Khan, Ershad and Nordberg, Åke and Malmros, Peter (2019). Thermo-economic analysis of a thermophilic biogas plant integrated with membrane distillation. I/In: UNSPECIFIED.
[Conference Paper]

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Abstract

This study assessed the thermo-economic performance of membrane distillation (MD) for concentrating nutrients and recover process water from digestate at a thermophilic biogas plant. The input data were derived from mapping the Uppsala Vatten och Avfall biogas system, present knowledge on anaerobic digestion process management and technologies for biogas system operating conditions in Sweden. The study evaluated the potential for recovering waste heat from the digestate effluent and boiler flue gas for use in the MD system. The thermal energy requirement, size, and separation efficiency of the MD unit were based on a previous laboratory study. The study assessed the overall energy efficiency and costs estimation of a full-scale codigestion plant with thermally integrated MD. Presented results shows that the proposed model of integrated MD system has the best thermal performance. The recovered waste heat contributed total thermal energy demand of MD and additionally it could save 19% boiler energy by heating incoming slurry. The results showed that the MD product water permeate was 3.5 L/(m2 h) at 65°C digestate inlet temperature. Specific heat demand for MD was 100 kWh/m3 with internal heat recovery. Cost estimation showed that the unit cost of MD permeate water was 3.6 €/m3 at a digestate feed temperature of 65°C. The economic assessment indicated that thermal integration of a biogas plant with MD could be economically feasible. However, long-term continuous studies are needed to determine impact of fouling and membrane lifetime.

Authors/Creators:Ullah Khan, Ershad and Nordberg, Åke and Malmros, Peter
Title:Thermo-economic analysis of a thermophilic biogas plant integrated with membrane distillation
Year of publishing :2019
Article number:0001
Number of Pages:5
Associated Programs and Other Stakeholders:?? SLU.id.research.prog-standup ??
ISBN for printed version:978-91-985634-4-3
Language:English
Publication Type:Conference Paper (UNSPECIFIED)
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 209 Industrial Biotechnology > Bioenergy
(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 208 Environmental Biotechnology > Water Treatment
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Renewable Bioenergy Research
Keywords:biogas plant, digestate, membrane distillation, concentrated nutrients and water recovery, thermo-economic analysis
URN:NBN:urn:nbn:se:slu:epsilon-p-105432
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-105432
ID Code:17608
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:28 Sep 2020 09:00
Metadata Last Modified:28 Sep 2020 09:01

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