NP-bioTech: a circular economy approach to catalyst-based biostabilization of citrus processing waste.

Background: Biowaste accounts for about 40% of total waste. Food-industry waste is one major biowaste stream. The available technological approaches to biowaste treatment are expensive, not circular, unsustainable, and they require pre-treatments such as dehydration, extraction of inhibitors, pH correction, or the addition of other organic matrices. The NP-bioTech process uses a biocatalyst adsorbed onto an inert material enabling accelerated fermentation of critical biomass without pre-treatments, transforming it into biostabilized and pasteurized material, and converting waste into new usable products rapidly. Biocatalysts consist of naturally fortified selections of microbial colonies, enzymes, and fungi that are resistant to the action of d-limonene and other fermentation inhibitors.

Results: The NP-bioTech process was able to activate vigorous fermentation of citrus waste without any of the pre-treatments required by other available biowaste-treatment technologies. The horticultural use of the biostabilized output of such process for greenhouse crops was verified. The addition of such output to the growth media was beneficial for plants and did not show negative effects on quality and yield of tomatoes (Lycopersicon esculentum L.). The concentration of Ca, K, Zn, Fe, and polyphenol increased; the average number of berries per plant was improved; the concentration of Pb and Cd contaminants decreased.

Conclusion: The NP-bioTech process emits no odors or pollutants. It does not generate leachate, and its output can be used in agriculture. It is capable of reconciling compliance with strict environmental restrictions, industrial feasibility, and economic sustainability. Its potential impact thus aligns well with the circular economy model. © 2025 Society of Chemical Industry.