Gruppo Ricicla labs. - Department of Agricultural and Environmental Sciences - Production, Landscape, Agroenergy, University of Milan, Via Celoria 2, 20133 Milano, Italy.
Grupo de Investigación en Tecnologías de Valorización de Residuos y Fuentes Agrícolas e Industriales para la Sustentabilidad Energética (INTERFASE), Escuela de Ingeniería Química, Universidad Industrial de Santander, Carrera 27, Calle 9 Ciudad Universitaria, Bucaramanga, Colombia.
Waste Manag. 2021 Nov;135:220-228. doi: 10.1016/j.wasman.2021.09.003. Epub 2021 Sep 15.
The aim of this study is to characterize the digestates from three plastic tubular digesters implemented in Colombia fed with: i) cattle manure; ii) cattle manure mixed with cheese whey; iii) pig manure. All the digesters worked under psychrophilic conditions. Physico-chemical characteristics, heavy metals, pathogens, and agronomic quality were investigated. All the digestates were characterized by physico-chemical characteristics and nutrients concentration suitable for their reuse as biofertilizer. However, these digestates may only partially replace a mineral fertilizer due to the high nutrients dilution. Heavy metals were under the detection limit of the analytical method (Pb, Hg, Ni, Mo, Cd, Chromium VI) or present at low concentration (Cu, Zn, As, Se) in all the digestates. Biodegradable organic matter and pathogens (coliform, helminths and Salmonella spp.) analysis proved that all the digestates should be post-treated before soil application in order to prevent environmental and health risks, and also to reduce residual phytotoxicity effects. The digestate from pig manure had a higher nutrient percentage (0.2, 0.6 and 0.05 % w/w of total N, PO and KO, respectively), but also higher residual phytotoxicity than the other digestates. Co-digestion seemed not to significantly improve the digestate fertilizing potential. Finally, further studies should address how to improve fertilizing potential of digestates from plastic tubular digesters, avoiding environmental and health risks.
本研究的目的是描述在哥伦比亚实施的三个塑料管状消化器中产生的消化物，这些消化器分别以以下三种物质为进料：i）牛粪；ii）牛粪与奶酪乳清混合；iii）猪粪。所有消化器均在低温条件下运行。研究了理化特性、重金属、病原体和农业质量。所有消化物均具有适合作为生物肥料再利用的理化特性和养分浓度。然而，由于养分稀释度高，这些消化物可能只能部分替代矿物肥料。所有消化物中的重金属含量均低于分析方法的检测限（Pb、Hg、Ni、Mo、Cd、Cr VI）或浓度较低（Cu、Zn、As、Se）。可生物降解有机物和病原体（大肠菌群、寄生虫和沙门氏菌）分析表明，所有消化物在用于土壤之前都应进行后处理，以防止环境和健康风险，并降低残留的植物毒性影响。猪粪消化物的养分百分比（总氮、磷和钾分别为 0.2、0.6 和 0.05%w/w）较高，但残留植物毒性也高于其他消化物。共消化似乎并没有显著提高消化物的施肥潜力。最后，应进一步研究如何提高塑料管状消化器消化物的施肥潜力，同时避免环境和健康风险。
