School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China; Graduate School of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama, Ehime 790-8566, Japan.
Ehime Prefectural Institute of Public Health and Environmental Science, 8-234, Sanbancho, Matsuyama, Ehime 790-0003, Japan.
Waste Manag. 2021 Feb 1;120:41-49. doi: 10.1016/j.wasman.2020.11.017. Epub 2020 Dec 4.
Phosphorus is an essential nutrient but faces foreseeable resource depletion. The incinerated sewage sludge ash (ISSA) is a promising source for recovering phosphorus. In this study, we proposed a new system for recovering phosphorus from ISSA. This innovative system uses phosphorus-selective adsorbent to purify phosphorus from the ISSA acid leachate. Laboratory scale batch and column tests were performed to demonstrate the feasibility of the system. Note that >70% of phosphorus in ISSA can be recovered as a high-purity recovery product. The product showed a structure similar to hydroxyapatite (Ca(PO)OH). The total amount of Ca, P, and O in the product was above 90 wt%. The content of trace elements (As, Cd, Cr, and Pb) in the product was below the fertilizer limits, suggesting that the health and environmental risks of using fertilizer in agriculture are negligible. The expected costs of the system were estimated. The reusability of the adsorbent can reduce the operational costs to a satisfactory level. This study provides a practical alternative for recovering phosphorus from ISSA.
磷是一种必需的营养物质，但面临着可预见的资源枯竭。焚烧后的污水污泥灰（ISSA）是回收磷的一种很有前途的资源。在本研究中，我们提出了一种从 ISSA 中回收磷的新系统。该创新系统使用磷选择性吸附剂从 ISSA 的酸浸出液中纯化磷。进行了实验室规模的批量和柱试验以证明该系统的可行性。请注意，ISSA 中超过 70%的磷可以作为高纯度回收产物回收。该产物的结构类似于羟基磷灰石（Ca(PO)OH）。产物中 Ca、P 和 O 的总量超过 90wt%。产物中痕量元素（As、Cd、Cr 和 Pb）的含量低于肥料限量，这表明在农业中使用肥料对健康和环境的风险可以忽略不计。对系统的预期成本进行了估算。吸附剂的可重复使用性可以将运营成本降低到一个满意的水平。本研究为从 ISSA 中回收磷提供了一种实用的替代方案。
