Dairy Wastewater for Production of Chelated Biodegradable Zn Micronutrient Fertilizers

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• 作者：Hanyu Zhang ; Megan Frey ; Criztel Navizaga ; Courtney Lenzo ; Julian Taborda ; William Taifan ; Abdolhamid Sadeghnejad ; Alfredas Martynas Sviklas ; Jonas Baltrusaitis
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：March 7, 2016
• 年：2016
• 卷：4
• 期：3
• 页码：1722-1727
• 全文大小：368K
• ISSN：2168-0485

文摘

Zinc containing organic materials were synthesized using dairy wastewater and solid zinc waste derived from zinc nitrate with the goal of obtaining biodegradable, slow release, micronutrient containing fertilizers. The developed synthesis procedure involved heating at mild 55 °C temperature, followed by pH adjustment to 7, precipitation, and drying. The resulting solid materials were characterized using weight analysis, thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transformed infrared spectroscopy (FTIR). Higher wastewater-to-zinc nitrate ratios of 1:¹/₅ yielded amorphous materials with no inorganic zinc compounds detected. TGA analysis showed very complex thermal behavior due to the large amount of organics present while FTIR analysis suggested the presence of both coordinated and uncoordinated carboxylic acid and ester groups. The developed process can have a variety of applications in recovering Zn from waste sources, such as tire crumb, while returning this valuable micronutrient into soil as a slow release biodegradable fertilizer.