Paper details

Title:

Mathematical Optimisation of a Case Study Wastewater Anaerobic Digestion System using ADM1 Coupled with the Transformer Tool

Author(s):

Ashraf, R.J., Nixon, J.D.

Document(s):

Abstract:

This paper presents a method to model and optimise a case study wastewater anaerobic digestion (AD) system with thermal hydrolysis (TH) pre-treatment. The aim is to optimise the substrate feeding rate and temperature of the digesters so that the overall biogas yield is maximised. Biogas yield from the digesters is predicted using the state-of the-art Anaerobic Digestion Model No. 1 (ADM1), coupled with the transformer tool, which updates ADM1 coefficients based on the daily dry solids content of sludge. The predicted biogas yield values are validated with measured data and genetic algorithm (GA) in Python is used to solve the optimisation problem. The results show that by optimising the substrate feeding rate and temperature, the daily average biogas yield can be increased from 0.494 m3/kgVS to 0.519 m3/kgVS. This can be achieved by varying the sludge input and temperature for each of the digesters, on a daily basis, instead of keeping a consistent value each day. Results from this paper will help in optimising the performance of wastewater AD systems, while considering varying daily sludge properties.

Keywords:

biogas, wastewater, case study, optimisation, thermal hydrolysis

Topic:

Biomass Conversion for Bioenergy

Subtopic:

Anaerobic digestion for biogas and biomethane production

Event:

31st European Biomass Conference and Exhibition

Session:

4DO.4.4

Pages:

656 - 661

ISBN:

978-88-89407-23-3

Paper DOI:

10.5071/31stEUBCE2023-4DO.4.4

Price:

FREE