Department of Applied Chemistry, Saga University, Honjo 1, Saga 840-8502, Japan.
J Environ Sci (China). 2009;21(12):1753-60. doi: 10.1016/s1001-0742(08)62484-5.
Ashes from sewage sludge incineration have a high phosphorus content, approximately 8% (W/W), which indicates a potential resource of the limiting nutrient. Incineration of sewage sludge with subsequent recovery of phosphorus is a relatively new sludge treatment technique. In this article, the leaching of phosphorus by using sulfuric acid as well as hydrochloric acid by means of several batch experiments was presented. At the same time a selective recovery of phosphorus by adsorption was also discussed. The effects of acid concentration, temperature and time on extraction were studied. The phosphorus leaching increased with the increase in acid concentration and temperature. Kinetic studies showed that the complete leaching of phosphorus took place in less than 4 h. Selective adsorption of phosphorus by using orange waste gel provided a hint for recovery of this natural resource, which eventually could meet the ever-increasing requirement for phosphorus. The overall results indicated that the incinerated sewage sludge ash can be treated with acid to efficiently recover phosphorus and thus can be considered a potentially renewable source of phosphorus.
污水污泥焚烧灰含有高含量的磷，约为 8%（W/W），这表明它是一种具有潜在限制养分资源。焚烧污水污泥并随后回收磷是一种相对较新的污泥处理技术。本文介绍了使用硫酸和盐酸通过多个批量实验浸出磷的方法，同时还讨论了通过吸附选择性回收磷的方法。研究了酸浓度、温度和时间对提取的影响。随着酸浓度和温度的升高，磷的浸出率增加。动力学研究表明，不到 4 小时即可完成磷的完全浸出。利用橙皮废物凝胶进行磷的选择性吸附为回收这种自然资源提供了线索，最终可以满足对磷的日益增长的需求。总体结果表明，焚烧后的污水污泥灰可以用酸处理，以有效地回收磷，因此可以被认为是一种具有潜在可再生磷源。
