Application of GMDH and genetic algorithm in fraction in biogas from landfill modeling

Subject Areas : environmental management

Mohammad Javad  Zoqi ¹ (استادیار گروه مهندسی عمران، دانشگاه بیرجند (مسوول مکاتبات))
Mohammad  Ghamgosar ² (Environmental reaserch institute of Jahad Daneshgahi)
Mohammad  Ghamgosar ³ (Phd student Of Applied Mathematics, Faculty Of Mathematical Sciences and Computer, Shahid Chamran University Of Ahvaz,Ahvaz,Iran)
Saeed  Fallahi ⁴ (Phd student Of Applied Mathematics, Guilan University)

Received: 2010-03-29 Accepted : 2010-08-07 Published : 2016-09-22

Keywords: GMDH Neural network, Genetic algorithm, Leachate, Landfill gas, Methane fraction,

Abstract :

Background and Objective: In this study, The Group Method of Data Handling (GMDH) type neural networks whit genetic algorithm was applied to estimate the methane fraction in landfill gas originating from Lab-scale landfill bioreactors. In this study, to predict the methane fraction in landfill gas as a final product of anaerobic digestion, we used input parameters such as pH, Chemical Oxygen Demand, NH4+-N and waste temperature. Method: To this Purpose, two different systems were applied for neural network’s data obtained. In system I (C1), the leachate generated from a fresh-waste reactor was drained to recirculation tank, and recycled every two days. In System II (C2), the leachate generated from a fresh waste landfill reactor was fed through a well-decomposed refuse landfill reactor, and at the same time, the leachate generated from a well-decomposed refuse landfill reactor recycled to a fresh waste landfill reactor. leachate and landfill gas components were monitored for 132 days. Findings: The study results indicate that GMDH is able to predict the methane fraction in landfill gas. The correlation between the observed and predicted values for the training data is 0.98 and for the testing data, it is 0.99. Discussion and Conclusion:  The proposed method can significantly predict the methane fraction in landfill gas originating and, consequently, GMDH can be use to optimize the dimensions of a plant using biogas for energy (i.e. heat and/or electricity) recovery and monitoring system.

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