Potato peel (PP) waste are generated in huge quantities, causing environmental pollution and health problems. Therefore, obtaining value-added products from PP is a current research challenge. In this work, novel Ca-biocomposites for phosphorus (P) removal were prepared by pyrolysis (500–800 °C) using eggshell (ES) and PP (ES/PP = 1:2 ratio by weight). ESPP-700 (pyrolyzed at 700 °C), reached a Q_max of 174.8 mg P/g, while the application of Ca-biocomposites in domestic wastewater showed 85.96% of P removal. According to the pseudo-second-order kinetic model, P adsorption was dominated by chemisorption, follows by apatite precipitation. The P solubility (62.5 wt.%) in formic acid (2.0 wt.%) and the water-soluble P (3.2 wt.%) for ESPP-700 after P adsorption, indicated that the final product would work as fertilizer for acidic soils. This is an important step in the management of agricultural wastes to implement the 3R slogan “Reduce, Reuse, Recycle” towards a circular economy.

马铃薯皮（PP）废弃物产生量巨大，造成环境污染和健康问题。因此，从 PP 中获取增值产品是当前的研究挑战。在这项工作中，使用蛋壳 (ES) 和 PP (ES/PP = 1:2 重量比) 通过热解 (500–800 °C) 制备了用于除磷 (P) 的新型 Ca 生物复合材料。ESPP-700（在 700 °C 下热解），达到Q _max174.8 mg P/g，而钙生物复合材料在生活废水中的应用显示出 85.96% 的 P 去除率。根据拟二级动力学模型，磷吸附以化学吸附为主，其次是磷灰石沉淀。磷在甲酸 (2.0 wt.%) 中的溶解度 (62.5 wt.%) 和磷吸附后 ESPP-700 的水溶性 P (3.2 wt.%) 表明最终产品可用作酸性土壤的肥料. 这是农业废弃物管理中实施3R口号“减少、再利用、再循环”迈向循环经济的重要一步。