Studies on Composting Spent Coffee Grounds by <i>Aspergillus sp</i> and <i>Aspergillus sp</i> in Aerobic Static Batch Temperature Control

Abstract

Spent Coffee Ground (SCG) is characterized by high organic content, in the form of insoluble polysaccharides bound and phenol compounds. Phenol compounds are toxic to nature and are a cause of environmental pollution. Composting method of this study is aerobic static batch composting with temperature control with adding activators of some fungi such as Aspergillus sp, and Penicillium sp. The purpose of the research is to fill the research gap from previous studies of spent coffee grounds compost, which requires a long time in composting, so that if it is used directly on the soil and plants, the positive effect also requires a long time. The result of composting for 28 days with this method is that mature compost has black crumb and normal pH, with characteristics of C/N ratio below 10: C1 (7.06), C2 (6.99). This value is far from the control with a C/N ratio of 8.33. Decompose rate of macromolecule are above 40% for lignin and 70% for cellulose. Implementation of compost in radish plants, resulting Germination Index above 80% which indicates that the compost is ripe: control (92.39%), C1 (183.88%), C2 (191.86%). The results of the analysis with FTIR also showed that the compost was mature and stable, and rich in minerals. So, it can be concluded that this composting method can speed up composting time and optimize the results of compost produced.

Green Synthesis of Phosphorous-Containing Hydroxyapatite Nanoparticles (nHAP) as a Novel Nano-Fertilizer: Preliminary Assessment on Pomegranate (Punica granatum L.)

“…As opposed to nHAPs_CE, the XRD spectrum of nHAPs mediated by PPE showed sharper peaks, and this might be explained by differences in pH of the two extracts used. The pH of pomegranate peel extract was 4.83 [40], while that of coffee grounds extract was close to neutral (6.5 to 6.8) [41]. Changes in pH (from alkaline to acidic), temperature, and reaction time affect the degree of crystallinity [42].…”

Spent Coffee Grounds Characterization and Reuse in Composting and Soil Amendment

“…Spectroscopic techniques have also been reported in SCG composting for fertilizers to identify the compost maturity [19,59] and organic matter humification [60]. SCG applications as agriculture fertilizers are discussed in Section 4.…”

“…Recent studies showed that SCGs have excellent potential to be used in agriculture because of their high amount of nutrients and low risk of heavy metal contamination [14,15]. Therefore, SCGs have already been reported to be a soil amendment or a top dressing to improve soil quality and control weeds [12,16,17], as well as composting with animal manure and other wastes to improve soil quality, enhance plant growth, and avoid intoxicating the soil [18,19]. Environmental pollution problems due to solid waste and new environmental regulations have forced the industry to pay more attention to waste management.…”

Stabilization of Spent Grains by Composting: Case of the BB Brewery in Lomé (Togo)

“…The choice of activators (bacteria and fungi) also plays an important role in the degradation rate of raw materials rich in lignin and hemicellulose such as spent grains. Adding specific fungi like Aspergillus and Penicillium would degrade lignin and hemicellulose faster [16].…”