Integrating bioprocess and metagenomics studies to enhance humic acid production from rice straw

This study aimed to examine the influence of a microbial consortium and other additives (chicken manure, urea, olive mill waste, zeolite, and biochar) on the composting process of rice straw and the subsequent production of humic acid. Results showed that among the fungal species,Thermoascus aurantiacus exhibited the most prominent impact in expediting maturation and improving compost quality, andBacillus subtilis was the most abundant bacterial species based on metagenomics analysis. The highest temperature, C/N ratio reduction, and amount of humic acid production (Respectively in lab 61  °C, 54.67%, 298 g kg−1 and in pilot level 65  °C, 72.11%, 310 g kg−1) were related to treatments containing these microorganisms and other additives except urea. Consequently,T. aurantiacus andB. subtilis can be employed on an industrial scale as compost additives to further elevate quality. Functional analysis showed that the bacterial enzymes in the treatments had the highest metabolic activities, including carbohydrate and amino acid metabolism compared to the control. The maximum enzymatic activities were in the thermophilic phase in treatments which were significantly higher than that in the control. The research emphasizes the importance of identifying and incorporating enzymatically active strains that are suitable for temperature conditions, alongside the native strains in decomposing materials. This strategy significantly improves the composting process and yields high-q...
Source: World Journal of Microbiology and Biotechnology - Category: Microbiology Source Type: research