The recovery of nutrients especially from sewage shows a growing interest due to its capability in enhancing environmental and economic benefit. The nutrients such as N and P that are rich in sewage can be recovered to be used as fertilizers. Over the years, many natural adsorbents such as NZs, chitosan, and biochar have been investigated for nutrient recovery. However, those adsorbents have low mechanical strength as well as a low affinity towards various charged contaminants. Hence, grafting them into hybrid absorbents may enhance their adsorption capacity (AC) in nutrients removal. The nutrients that can be recovered are up to 96 %. This review summarizes the physical properties, performance in nutrient removal and recovery of NZs, chitosan, biochar, and respective hybrid adsorbents.

由于其增强环境和经济效益的能力，尤其是从污水中回收养分的兴趣日益增长。富含污水的氮和磷等营养物质可以回收用作肥料。多年来，人们已经对许多天然吸附剂（例如NZs，壳聚糖和生物炭）进行了营养回收研究。然而，那些吸附剂具有低机械强度以及对各种带电污染物的低亲和力。因此，将它们接枝到混合吸收剂中可以增强它们在去除营养物方面的吸附能力（AC）。可以回收的营养物高达96％。这篇综述总结了NZs，壳聚糖，生物炭和各自的混合吸附剂的物理性质，在营养去除和回收方面的性能。