Leaching of phosphorus from incinerated sewage sludge ash by means of acidextraction followed by adsorption on orange waste gel
Biplob Kumar Biswas , Hiroyuki Harada , Keisuke Ohto , Hidetaka Kawakita
DOI:
Received January 27, 2009,Revised April 27, 2009, Accepted , Available online
Volume 21,2009,Pages 1753-1760
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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 e ects
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 e ciently recover phosphorus and thus can be considered a potentially renewable source of phosphorus.
