Simulation of anaerobic digestion processes using stochastic algorithm

Journal of Environmental Health Science Engineering

Sundarambal Palani²  Jegathambal Palanichamy¹ 

[1] Water Institute, Karunya University, Coimbatore 641114, Tamil Nadu, India;Tropical Marine Science Institute, National University of Singapore, Singapore 119227, Singapore

关键词: Modeling;    Gillespie algorithm;    Stochastic algorithm;    Anaerobic digestion;   

Others  :  1164578
DOI  :  10.1186/s40201-014-0121-7

 received in 2013-08-10, accepted in 2014-08-24,  发布年份 2014

【 摘 要 】

Background

The Anaerobic Digestion (AD) processes involve numerous complex biological and chemical reactions occurring simultaneously. Appropriate and efficient models are to be developed for simulation of anaerobic digestion systems. Although several models have been developed, mostly they suffer from lack of knowledge on constants, complexity and weak generalization. The basis of the deterministic approach for modelling the physico and bio-chemical reactions occurring in the AD system is the law of mass action, which gives the simple relationship between the reaction rates and the species concentrations. The assumptions made in the deterministic models are not hold true for the reactions involving chemical species of low concentration. The stochastic behaviour of the physicochemical processes can be modeled at mesoscopic level by application of the stochastic algorithms.

Method

In this paper a stochastic algorithm (Gillespie Tau Leap Method) developed in MATLAB was applied to predict the concentration of glucose, acids and methane formation at different time intervals. By this the performance of the digester system can be controlled. The processes given by ADM1 (Anaerobic Digestion Model 1) were taken for verification of the model.

Results

The proposed model was verified by comparing the results of Gillespie¿s algorithms with the deterministic solution for conversion of glucose into methane through degraders. At higher value of `?` (timestep), the computational time required for reaching the steady state is more since the number of chosen reactions is less. When the simulation time step is reduced, the results are similar to ODE solver.

Conclusion

It was concluded that the stochastic algorithm is a suitable approach for the simulation of complex anaerobic digestion processes. The accuracy of the results depends on the optimum selection of tau value.

【 授权许可】

   
2014 Palanichamy and Palani; licensee BioMed Central Ltd.

【 图 表 】

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