Department of Animal Production Technology and Fishery, School of Agricultural Technology, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand.
Advanced Functional Phosphate Material Research Unit, Department of Chemistry, School of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, 10520, Thailand.
Sci Rep. 2021 Jul 26;11(1):15143. doi: 10.1038/s41598-021-94643-1.
Egg consumption is very high throughout the world and with it comes enormous amount of waste eggshells. To reduce and utilize these wastes, eggshell wastes were simply transformed to low- or high-purity calcium carbonate grades by washing, crushing, and drying to use as raw materials for producing highly valuable calcium phosphate products. Low-purity calcium carbonate grade was used to prepare triple superphosphate for using in fertilizer industry, whereas high-purity calcium carbonate grade was used to produce dicalcium phosphate dihydrate, monocalcium phosphate monohydrate, and tricalcium phosphate for using in mineral feed and food additive industries. All calcium phosphate samples obtained by simple, rapid, cheap, and environmentally safe method using eggshells and phosphoric acid were identified and their structural phases and impurities were determined by XRF, XRD and FTIR techniques. Thermal behaviors of raw materials and the prepared calcium phosphates excepted tricalcium phosphate were investigated by TG/DTG techniques. The methodologies described here will be useful to manage eggshells by converting them to highly valuable products, which can solve eggshell wastes problem from industries and communities. This finding supports the viewpoint of zero waste operation to produce value-added products for obtaining sustainable development, which may be selected as an alternative way for material recycling and waste management in the future.
鸡蛋的消耗量在全球范围内都非常高，随之而来的是大量的蛋壳废物。为了减少和利用这些废物，可以通过清洗、粉碎和干燥等简单方法将蛋壳废物转化为低纯度或高纯度碳酸钙，将其作为生产高价值磷酸盐产品的原料。低纯度碳酸钙可用于生产过磷酸钙，用作肥料工业的原料，而高纯度碳酸钙则用于生产磷酸氢钙二水合物、磷酸一钙一水合物和磷酸三钙，用于矿物饲料和食品添加剂工业。所有的磷酸盐样品都是通过使用鸡蛋壳和磷酸的简单、快速、廉价和环境安全的方法获得的，通过 XRF、XRD 和 FTIR 技术对其结构相和杂质进行了鉴定。除了磷酸三钙之外，通过 TG/DTG 技术研究了原材料和制备的磷酸钙的热行为。这里描述的方法将有助于通过将蛋壳转化为高价值产品来管理蛋壳，从而解决工业和社区的蛋壳废物问题。这一发现支持了零废物操作的观点，即生产附加值产品以实现可持续发展，这可能成为未来材料回收和废物管理的一种替代方法。
