Presence of nutrients in municipal sewage water in high concentrations has raised awareness of their reuse as a vital limiting resource. With an aim to recover the nutrients in a form that can be used as a soil amendment, a novel biocompatible nanocomposite (BC-P@MNP) was fabricated using green methods. Polysaccharide induced biogenic magnetite nanoparticles (P@MNP) were immobilized onto the biochar of jackfruit peel (BC) to fabricate BC-P@MNP. Microwave irradiation employed during the fabrication of BC-P@MNP involved less energy consumption, high yields and better adsorption performance as compared to BC and other reported biochar-composites. Structural features like mesoporosity, crystallinity, magnetism, functionality and nano-sized dimension was demonstrated in BC-P@MNP. Under optimized conditions, batch studies revealed a maximum adsorption efficiency of 7.94 mg/g and 5.26 mg/g for phosphates and nitrates respectively. Thermodynamics revealed the feasibility and exothermicity of the system. The high selectivity in the presence of competing co-anions, high regeneration capacity and better separability enable BC-P@MNP to be used as advanced, economical adsorbent for wastewater applications. High nutrient recovery and biocompatibility ensured the potential of the spent adsorbent to be used as a soil amendment. Breakthrough curves obtained from fixed-bed column tests conducted on agricultural wastewater demonstrated the use of higher bed depths and lower flow rates for achieving higher phosphate removal as well as for ensuring lower unused column bed. The study demonstrated the technological advancement of a biogenic nanocomposite fabricated from green methods over other reported adsorbents for removal and recovery of nutrients from water.

城市污水中高浓度营养物质的存在提高了人们对其作为重要限制性资源再利用的认识。为了以可用作土壤改良剂的形式回收养分，使用绿色方法制造了一种新型的生物相容性纳米复合材料（BC-P@MNP）。将多糖诱导的生物磁铁矿纳米颗粒（P@MNP）固定在菠萝蜜皮（BC）的生物炭上以制备 BC-P@MNP。与 BC 和其他报道的生物炭复合材料相比，在制造 BC-P@MNP 过程中使用的微波辐射涉及更少的能耗、高产率和更好的吸附性能。BC-P@MNP 展示了介孔性、结晶度、磁性、功能性和纳米尺寸等结构特征。在优化条件下， 毫克/克和 5.26 磷酸盐和硝酸盐分别为 mg/g。热力学揭示了该系统的可行性和放热性。存在竞争性共阴离子时的高选择性、高再生能力和更好的分离性使 BC-P@MNP 能够用作废水应用的先进、经济的吸附剂。高养分回收率和生物相容性确保了用过的吸附剂作为土壤改良剂的潜力。从对农业废水进行的固定床柱测试中获得的突破曲线表明，使用更高的床深和更低的流速来实现更高的磷酸盐去除率以及确保更低的未使用柱床。