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Production for compost (frass) from coffee pulp by biotransformation with black soldier fly larvae (hermetia illucens)
The research contemplates the feeding of black soldier fly (MSN) larvae for the biotransformation of coffee pulp into organic fertilizer. The transformation method was carried out with larvae five days after hatching, in a scale reactor, controlling the temperature between 27 and 30 °C and relative humidity between 60 and 70%. The coffee pulp, used as substrate, contained an initial humidity of 82.67%. The feeding rates chosen were 222.2, 444.4, 666.6 and 777.7 mg/larva.day in wet mass. The experimentation period was 15 days. For the germination test, the feeding rate of 666.6 mg/larva.day was chosen, corresponding to 3 tomato (Solanum lycopersicum) seeds per container, in synthetic soil mixture constructed with concentrations of 100:0, 75:25, 50:50, 25:75, 0:100, frass (MSN larvae compost) and coco peat respectively, with 10 replicates for each test. The characterization methods include in NTC 5167:2022, pH, moisture, ash, density, total organic carbon and total phosphorus. The Klason method was used for lignin content. The best compost obtained in the experiment was
666.6 mg/larva.day, which presented pH 8.12, density 0.42 g/cm3, lignin 43.91%, total organic carbon 46.49%, final moisture 76.92%, ash 49.08%, total phosphorus 0.0013%. The plants with the best growth were those of the 25:75 frass and coco peat treatment, showing a height of 96.23 mm, diameter 1.9 mm, number of leaves 14 and germination of 86.67%; this measurement was carried out during 27 days.
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