title: Nonlinear Autoregressive Exogenous modeling of a large anaerobic digester producing biogas from cattle waste.
abstract: In waste-to-energy plants, there is every likelihood of variations in the quantity and characteristics of the feed. Although intermediate storage tanks are used, but many times these are of inadequate capacity to dampen the variations. In such situations an anaerobic digester treating waste slurry operates under dynamic conditions. In this work a special type of dynamic Artificial Neural Network model, called Nonlinear Autoregressive Exogenous model, is used to model the dynamics of anaerobic digesters by using about one year data collected on the operating digesters. The developed model consists of two hidden layers each having 10 neurons, and uses 18days delay. There are five neurons in input layer and one neuron in output layer for a day. Model predictions of biogas production rate are close to plant performance within ±8% deviation.
authors.affiliation: Ministry of New and Renewable Energy, Govt. of India, Block-14, CGO Complex, Lodhi Road, New Delhi 110 003, India.
authors.forename: Anil K
authors.initials: AK
authors.lastname: Dhussa
authors.affiliation: University School of Chemical Technology, Guru Gobind Singh Indraprastha University, Sector - 16 C, Dwarka, Delhi 110078, India.
authors.forename: Surinder S
authors.initials: SS
authors.lastname: Sambi
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India.
authors.forename: Shashi
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India.
authors.forename: Sandeep
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India. Electronic address: skumar.iitroorkee@gmail.com.
authors.forename: Surendra
authors.initials: S
authors.lastname: Kumar
mesh_terms: D000818:Animals; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D056804:Biofuels / Q000032:analysis*; D002417:Cattle / Q000378:metabolism*; D003198:Computer Simulation; D007194:India; D008372:Manure / Q000032:analysis* / Q000382:microbiology; D008697:Methane / Q000096:biosynthesis*; D016571:Neural Networks, Computer; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
chemical_list: D056804:Biofuels; D008372:Manure; D008697:Methane
keywords: Anaerobic digester; Artificial Neural Network; Biogas; Cattle waste treatment; NARX model