Development of functional composts using spent coffee grounds, poultry manure and biochar through microbial bioaugmentation

Abstract

Spent coffee grounds (SCG), poultry manure, and agricultural waste-derived biochar were used to manufacture functional composts through microbial bioaugmentation. The highest yield of tomato stalk-based biochar (40.7%) was obtained at 450°C with a surface area of 2.35 m g. Four pilot-scale composting reactors were established to perform composting for 45 days. The ratios of NH-N/NO-N, which served as an indicator of compost maturity, indicate rapid, and successful composting via microbial bioaugmentation and biochar amendment. Moreover, germination indices for radish also increased by 14-34% through augmentation and biochar amendment. Microbial diversity was also enhanced in the augmented and biochar-amended composts by 7.1-8.9%, where two species of Sphingobacteriaceae were dominant (29-43%). The scavenging activities of 2,2-diphenyl-1-picrylhydrazyl (DPPH) were enhanced by 14.1% and 8.6% in the fruits of pepper plants grown in the presence of the TR-2 (augmentation applied only) and TR-3 (both augmentation and biochar amendment applied) composts, respectively. Total phenolic content was also enhanced by 68% in the fruits of the crops grown in TR-3. Moreover, the other compost, TR-L (augmentation applied only), boosted DPPH scavenging activity by 111% in leeks compared with commercial organic fertilizer, while TR-3 increased the phenolic content by 44.8%. Composting facilitated by microbial augmentation and biochar amendment shortened the composting time and enhanced the quality of the functional compost. These results indicate that functional compost has great potential to compete with commercially available organic fertilizers and that the novel composting technology could significantly contribute to the eco-friendly recycling of organic wastes such as spent coffee grounds, poultry manure, and agricultural wastes.

An Insight into Microbial Inoculants for Bioconversion of Waste Biomass into Sustainable “Bio-Organic” Fertilizers: A Bibliometric Analysis and Systematic Literature Review

“…However, the identity of the microbial agent (MA-1) mentioned in [ 52 ], used for the composting of a combination of wastes consisting of spent coffee grounds, poultry manure and biochar, was undetermined. Furthermore, one of the studies determined the biodegradation of sludge produced by the petroleum industry by the application of Effective Microorganisms (EM) bokashi under anaerobic conditions.…”

Ameliorant for Improving the Growth Characters of Garut Indigenous Arabica Coffee

“…The response of plants to enlargement of stem diameter is slow because it is more influenced by genetic factors of the plant itself. The functional compost has a lot of potential to compete with commercially available organic fertilizers, and the new composting technique has the ability to help recycle organic wastes like discarded coffee grounds, chicken manure, and agricultural wastes in an environmentally friendly way [6]. According to [3], the number and size of leaves is more influenced by the genotype and the environment in which it grows.…”

The Efficacy of Functional Composts Manufactured Using Spent Coffee Ground, Rice Bran, Biochar, and Functional Microorganisms

“…The phytotoxicity test for the composts was performed based upon the germination index of the test plants. Seed germination rate (GR) and root elongation (RE) were measured and calculated using the formula GI = GR × RE/100, where GI is the germination index, GR is the germination rate, and RE indicates root elongation [32].…”