ResumenEn los sistemas de producción animal se generan grandes cantidades de excretas que ocasionan impactos ambientales negativos. No obstante, éstas son fuentes de nutrimentos para la elaboración de abonos orgánicos. La siguiente investigación tiene como objetivo proponer un sistema biológico acelerado (5 días) para la obtención de abonos orgánicos. De este modo, se pretrataron excretas frescas de ganado vacuno y se aplicaron 25 tratamientos con las excretas tratadas (ET) en una proporción hasta del 100%, melaza de caña de azúcar y como inóculo el consorcio microbiano ácido láctico (B-lac) en la proporción de 0, 5, 10, 15 y 20 % (v/p) respectivamente, bajo un Diseño Completo al Azar (DCA) con arreglo factorial 5x5. Se utilizó la prueba de la comparación de rangos múltiples de Tukey a un nivel de significancia de 0.05 y la de Mínimos Cuadrados para el efecto de interacción melaza y B-lac. Los tratamientos fueron evaluados por un período de 21 días y los resultados mostraron al tratamiento T20 (20% melaza, 15 %B-lac y 65% ET) como el mejor tratamiento que cumplió los requerimientos planteados de pH más bajo 4.02 y acidez más alta en el menor tiempo de 2.06% en ácido láctico; además T20 estuvo exento de agentes patógenos y presentó buenas propiedades agronómicas de nitrógeno 4 200 mg L -1 , de fósforo 744 mg L -1 , potasio 17 200 mg L -1 , materia orgánica 181 g L -1 y un alto contenido de micronutrimentos. El tratamiento biotecnológico usado permitió darle valor agregado a las excretas, transformándolas en abonos orgánicos de interés agronómico, estables y libres de agentes patógenos. Palabras clave: biol, excretas pretratadas, consorcio microbiano, ácido láctico. AbstractAnimal production systems generate large amounts of excreta that cause negative environmental impacts. However, these are a source of nutrients for the production of organic fertilizers. The following research had the objective of proposing a rapid biological system (5 days) devised to obtain an agronomic organic fertilizer. Thus, 25 treatments (ET) were applied to initially pretreated fresh cattle manure in proportions up to 100% of molasses of sugar cane and lactic acid inoculum (B-lac) in ratios of 0, 5, 10, 15 and 20% (v / w) respectively. A Random Complete Design with factorial arrangement 5x5 was used and mean differences were established with Tukey and Least Square Means for the effect of molasses and B-lac. Treatments were evaluated for a period of 21 days and the results showed that T20 treatment (20 % molasses, 15 % B-lac and 65 %-lac ET) resulted in the best treatment which fulfilled elevated requirements of lower pH 4.02, higher acidity in shortest time of 2.06 % lactic acid. T20 was free of pathogens and had good agronomic properties of 4 200 mg L -1 of nitrogen, 744 mg L -1 of phosphorus and 17 200 mg L -1 of potassium, 181 g L -1 of organic material and a high content of micronutrients. The biotechnological treatment used enabled to provide a higher value to the excreta, transforming them into a stable, pathogen free agronomic or...
ResumenLos residuos pesqueros se producen en grandes volúmenes en el Perú, generando problemas de contaminación, sin embargo, estos pueden ser un favorable sustrato para aplicaciones biotecnológicas. El ensilado biológico de pescado puede suplir a los medios de cultivo masivo basados en fertilizantes agrícolas para la producción de microalgas. Se cultivó a Nannochloropsis oculata en lote durante 12 días hasta alcanzar la fase estacionaria, con temperatura e iluminación constantes las 24 horas del día. Se compararon siete diferentes medios de cultivo (T1, Guillard F/2, T2, Yashima y T3-T6, cuatro medios basados en ensilado de pescado, y T7 harina de pescado). Los medios basados en ensilado de pescado fueron dos con diferentes ensilados (hidrolizados y no-hidrolizado) y dos por enriquecimiento del medio Yashima con ensilado nohidrolizado en diferentes concentraciones. El mejor de los tratamientos experimentales fue el del medio basado en ensilado de pescado no-hidrolizado (T6), no encontrándose diferencias significativas en la productividad máxima de este cultivo comparado con la del medio Yashima (1.65 g.L -1 .d -1 ). La producción mensual estimada utilizando este medio fue de 41.5 g.mes -1 .L -1 . Se evaluó la calidad nutricional de la biomasa de N. oculata obtenida como alimento vivo para el rotífero Brachionus plicatilis y se encontró que el tratamiento T6 obtuvo un mayor índice de fecundidad, en comparación al tratamiento T2, lo que es un indicador de buena calidad nutricional. El medio basado en ensilado de pescado mostró una alta producción, bajo costo y buena calidad nutricional para la producción de microalgas. Palabras clave: Acuicultura, medios orgánicos, residuos pesqueros, microalgas, Nannochloropsis, Brachionus Abstract Fishing residues are produced in large volumes in Peru, generating pollution problems, but conversely can be a favourable substrate for biotechnological applications. Biological fish ensilage can replace massive culture media based on agricultural fertilizers for microalgae production. Nannochloropsis oculata was grown in batch culture during 12 days until stationary phase, under constant temperature and an illumination of 24 h.d -1 . Seven different culture media (T1, Guillard F/2, T2, Yashima and T3-T7 d four culture media based on biological fish ensilage and T7 fish floor) were compared. Media based on biological fish ensilage were: two with different kinds of ensilages (hidrolized and non-hidrolized) and two with Yashima medium plus non-hidrolized ensilage at two different concentrations. The best experimental treatment was the medium based on non-hidrolized biological fish ensilage (T6), but non significant differences in maximum productivity were found compared with culture on Yashima medium (1.65 g.L -1 .d -1 ). Monthly production using this medium was estimated in 41.5 g.month -1 .L -1 . N. oculata biomass nutritional quality as live food for Brachionus plicatilis rotifer was evaluated and it was found that nonhidrolized ensilage treatment T6 had a greater fecundity index in ...
The purpose of this research was to evaluate the capability of lactic acid bacteria (LAB) to remove pathogens present in domestic wastewater, generated in the eco-touristic circuit Lomas de Lucumo (Lima, Peru). The pH decrease was used as an indicator of the elimination of fecal coliform bacteria in the treated water. Experiments included 36 treatments, which consisted of different mixtures of sugar molasses and a lactic acid bacteria inoculum (B-Lac) in proportions of 0, 1, 3, 5, 7 and 10% (v/v) and wastewater in a fixed proportion of 200 ml, under a completely randomized design (CRD) with factorial arrangement 6x6. The pH values on the third day were evaluated using an Analysis of Variance (ANOVA) followed by Tukey´s range test for mean differences (p < 0.05). The different treatments were analyzed in a first stage for 9 days, after which the best three were selected for a second evaluation: T16 (3% molasses and 5% B-Lac), T22 (5% molasses and 5% B-Lac) and T33 (10% molasses and 3% B-Lac); results show that the interaction effect between the two variables is significant. Finally, treatment T16 was selected as the most efficient, reaching a pH of 4.08 in a short time (3 days) that assured the complete removal of fecal coliform bacteria (9.65x10 5 MPN/100 ml) in the wastewater.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.