[en] The worrying and growing trend in the generation of waste in Europe leads States, including Spain, to take actions to mitigate it. Of these, 34% are municipal waste, whose separate collection is intended to be used for the composting of the organic fraction. This technique was applied at the University of A Coruña (UDC) as co-composting between waste collected separately in different faculties (70% of the weight composted) and food waste from the canteen (without improper), whose data is compiled in this text, accompanied by a bibliographic review of this process. The information obtained refers to the monitoring of the process, but also includes the quality of the separation and the final compost produced. This monitoring, carried out by temperature and oxygen concentration measurements, was controlled with irrigation, turning and, exceptionally, with a change of container; offering some usual values in this technique when compared to the composting of canteen waste. The data for this system was obtained by monitoring the 900-liter composter located in the composting area of the Faculty of Sciences and Higher Technical School of Architecture (UDC), where the co-composting of this project was also carried out. The quality of the separation concludes in a percentage of improper of 2.3% of the total collected, while food waste reached 78.4%, completing with other categories. Lastly, the final compost is evaluated with pH, electrical conductivity, humidity, volatile solids, elemental analysis and self-heating, parameters also used as indicators in monitoring. Also, its toxicity was expressed through the microbiological analysis of Escherichia coli and Salmonella, comparing it with mature compost from other composting areas of the UDC. Overall, it is concluded that the cocomposting of these residues is feasible, but it is convenient to improve their C/N ratio.

[gl] A tendencia preocupante e crecente na xeración de residuos en Europa leva aos Estados, entre eles España, a tomar medidas para a súa mitigación. De estes, o 34% son residuos municipais, cuxa recollida separada preténdese aproveitar para a compostaxe da fracción orgánica. Esta técnica foi aplicada na Universidade da Coruña (UDC) como co-compostaxe entre os residuos recollidos separadamente en diferentes facultades (70% do peso compostado) e residuos alimentarios de cafetería (sen impropios), cuxos datos se recompilan neste texto, acompañados dunha revisión bibliográfica deste proceso. A información presentada refírese ao seguimento do proceso, pero tamén inclúe a calidade da separación e do compost final producido. Esta operación, realizada mediante temperatura e concentración de osíxeno, foi controlada con rega, volteo e, excepcionalmente, con cambio de recipiente; ofrecendo uns valores habituais nesta técnica ao ser comparada coa compostaxe de residuos de cafetería. Os datos deste último obtivéronse co seguimento do composteiro de 900 litros situado na zona de compostaxe da Facultade de Ciencias y Escola Técnica Superior de Arquitectura (UDC), lugar no que se efectuou tamén a co-compostaxe deste proxecto. A calidade da separación conclúe nunha porcentaxe de impropios do 4,9% sobre o total recollido, mentres que os residuos alimentarios alcanzaban o 69,3%, completándose con outras categorías. Por último, o compost final é avaliado con pH, condutividade eléctrica, humidade, sólidos volátiles, análise elemental e autoquecemento, parámetros tamén usados como indicadores no seguimento. Ademais, a súa toxicidade expresouse mediante a análise microbiolóxica de Escherichi coli e Salmonella, comparándose co compost maduro doutras zonas de compostaxe da UDC. Globalmente, conclúese que é viable a co-compostaxe destes residuos, pero é conveniente mellorar a relación C/N.