Because global phosphorus (P) resources are limited, the continued supply of this element is a concern, and the recovery of P from waste is desirable. Carbonized sludge contains aluminum (Al) and iron (Fe) as a result of the addition of coagulants added during dewatering, which hinders the effective use of recovered P. Therefore, it is necessary to develop recovery methods that extract P but not Al or Fe. Zirconium was loaded onto orange waste, a cheap and available agricultural waste in Japan, to investigate the feasibility of its utilization for phosphorus recovery. In the present study, a biomass adsorbent was applied to the selective adsorption of P following extraction using 0.25 mol/l sulfuric acid. This process, based on a batch adsorption system employing a solid-to-liquid ratio of 50 mg/ml or more, was found to adsorb close to 100% of the P but less than 6% of the Al. When the adsorbent was separated and treated with a 0.25 mol/l sulfuric acid solution at a solid-to-liquid ratio of 20 mg/ml, about 75% of the Al was removed but none of the P. Immersion in a NaOH solution was able to strip the P from the adsorbent, giving P and Al concentrations in the desorption solution of 800 and 3 mg/l, respectively.

由于全球磷 (P) 资源有限，该元素的持续供应令人担忧，希望从废物中回收 P。炭化污泥在脱水时加入混凝剂，结果含有铝（Al）和铁（Fe），阻碍了回收P的有效利用。 因此，有必要开发提取P而不提取Al或Fe的回收方法. 将锆装载到日本廉价且可用的农业废物橙色废物中，以研究其用于磷回收的可行性。在本研究中，在使用 0.25 mol/l 硫酸提取后，将生物质吸附剂应用于 P 的选择性吸附。该工艺基于采用 50 mg/ml 或更高固液比的间歇吸附系统，发现吸附接近 100% 的 P 但少于 6% 的 Al。当吸附剂被分离并用 0.25 mol/l 的硫酸溶液以 20 mg/ml 的固液比处理时，去除了约 75% 的铝，但没有去除 P。浸入 NaOH 溶液中能够从吸附剂中去除 P，使解吸溶液中的 P 和 Al 浓度分别为 800 和 3 毫克/升。