BIOGAS PRODUCTION FROM CHICKEN MANURE: CHARACTERIZATION AND KINETIC MODELS

Abstract

Characterizing chicken manure (CM) before anaerobic digestion (AD) and the knowledge of the kinetics of the process resulting in minimum and maximum biogas product is important. CM is a hazardous animal residue and kinetics is rarely studied without co-digesting with other feedstocks. Therefore, the objectives is to use POLYMATH 6.10 Educational Release and the Origin 2018 softwares to determine kinetic parameters in Modified Gompertz, Transfert, Cone and Logistic models used in biogas kinetic study and to propose the best model based on the characteristic of the CM used and the regression fitting. This was achieved by using regression parameters estimated by the two softwares using the Levenberg-Marquadt nonlinear technique. Findings shows that Logistic gave the best prediction, followed by Cone, Modified Gompertz, and Transfert model, in that order; though the above models puts biogas potential of CM at approximately 1m³ from 1:1 water-to-CM digestion with 63% methane, 29% carbondioxide, 5.8% hydrogen, 1.4% hydrogen sulphide, 0.6% ammonia, 0.1% nitrogen and 0.1% moisture.