Abstract
Background: Decanter cake is produced in large amounts, and its disposal is a major concern in palm-producing countries. Growth morphology and biochemical responses of lady's finger (Abelmoschus esculentus) plants grown on soil amended with different ratios of decanter cake (0%, 10%, 20%, and 30%) were investigated. Results: The soil pH decreased (unamended soil), whereas the electrical conductivity increased as compared with the control. There was a significant difference in ascorbic acid content with the increase in treatment ratio. Phenol content was however highest in 20% of the amendment (13.197 ± 0.36mg g �1 ). Conclusions: The results indicate that decanter cake amendments of up to 10% may be a probable substitute for inorganic fertilizers with respect to lady's finger (A. esculentus) plants due to high nutrient content, yield and biomass, as well as morphological characteristics. However, there were observable negative effects after 10% decanter cake amendment ratios.
Highlights
Lignocellulosic agriculture residue and farm waste are abundant biomass of high potential to serve as renewable feedstock for sustainable biogas production and value-added products; they are currently undervalued (Paul and Dutta 2018)
The objective of this study was to assess the adaptation of the anaerobic microbial consortium through the kinetic of biodegradation of lignocellulosic substrates [hemicellulose, cellulose, xylan:cellulose mixture, cow manure, and wheat straw] and methane production in batch reactors at low temperature (20 °C)
The anaerobic digestion experiments were performed in six pairs of (1.0 L; working volume = 0.5 L) bottles maintained at 20 °C for three successive cycles to digest
Summary
Lignocellulosic agriculture residue and farm waste are abundant biomass of high potential to serve as renewable feedstock for sustainable biogas production and value-added products; they are currently undervalued (Paul and Dutta 2018). Anaerobic digestion is a low-cost microbial conversion process (Lynd et al 2008) which converts biodegradable organic substrates such as manure and farm lignocellulosic waste biomass into methane (Lynd et al 2008). A very small fraction of microorganisms may benefit from these stresses and dominate the culture and contribute to its intended functionality. Fastidious microorganisms such as mono-trophic species as well as microorganisms which function in symbiotic interaction with other species will likely be screened out upon the elimination of their substrate or their symbiotic partners, respectively
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