Evaluation of Biochemical Methane Potential and Kinetics on the Anaerobic Digestion of Vegetable Crop Residues

Abstract

There is a lack of literature reporting the measurement and prediction of biochemical methane potential (BMP) of vegetable crop residues (VCRs) and similarly, the kinetic assessment on the anaerobic digestion process of VCR is rarely investigated. In this paper, the BMP tests of five different vegetable (snap bean, capsicum, cucumber, eggplant, and tomato) crop residues were conducted at feed to inoculum ratio (F/I) of 2.0 under mesophilic (36 ± 1 °C) conditions. A series of single-variable and multiple-variable regression models were built based on organic components (hemicellulose, cellulose, lignin, total fat, total sugar, and crude protein) for BMP prediction. Three kinetic models, including the first-order kinetic model, the Chen and Hashimoto model, and the modified Gompertz model, were used to simulate the methane yield results of VCR and obtain valuable model parameters simultaneously. As a result, the BMPs and volatile solids (VS) degradation degree of different VCRs were respectively in the range of 94.2–146.8 mL g−1 VS and 40.4–49.9%; the regression prediction models with variables lignin (R2 = 0.704, p = 0.076), variables crude protein and lignin (R2 = 0.976, p = 0.048), and variables total fat, hemicellulose, and lignin (R2 = 0.999, p = 0.027) showed the best performance on BMP prediction among the single-factor, two-factor, and three-factor models, respectively. In addition, compared to the other two kinetic models, the modified Gompertz model could be excellently fitted (R2 = 0.986–0.998) to the results of BMP experiment, verification deviations within 0.3%.

A Preliminary Study of the Effect of Bioavailable Fe and Co on the Anaerobic Digestion of Rice Straw

“…Biomethane can be produced from a wide range of lignocellulosic materials (LMs), with the term LM referring to any plant dry matter, which is mainly composed of carbohydrate (i.e., cellulose and hemicellulose) and aromatic (i.e., lignin) polymers [3]. Waste LMs represent the most promising renewable organic feedstock for biogas generation, since their production does not compete for arable land [4]. More than 3 trillion kilos of LMs are available from agricultural sources every year and methane yields from the AD of crop residues are in the range of 3200 to 4500 cubic meters per hectare per year [5].…”

Comparative Analysis of the Amount of Biogas Produced by Different Cultures using the Modified Gompertz Model and Logistic Model

“…The parameters of this model are Rm, P, . The higher the value of 'Rm' the higher the production rate of biogas and λ is essential to determine the efficiency of anaerobic digestion (Li et al, 2019).…”

Biogas Production from Oil Palm Empty Fruit Bunches and Palm Oil Decanter Cake using Solid-State Anaerobic co-Digestion

“…where B t is methane cumulated at time t, B ∞ is the ultimate methane cumulating at the end of an experimental period and t is time (day). R max is the maximum methane production rate (mL-CH 4 /g VS-day); e = exp (1) = 2.7183; and is the lag phase period (day) [14].…”