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http://dx.doi.org/10.17137/korrae.2018.26.1.29

Recovery of Calcium Phosphate from Sewage Sludge Ash  

Jung, Jinmo (Department of Biological and Environmental Engineering, Semyung University)
Yoon, Seok-Pyo (Department of Biological and Environmental Engineering, Semyung University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.26, no.1, 2018 , pp. 29-37 More about this Journal
Abstract
In this study, optimum extraction conditions for phosphorus recovery from sewage sludge ash(SSA) were investigated. For this purpose, an experiment was conducted to determine optimal recovery conditions for Ca-P type phosphorus by using calcium component in the recycled aggregate residue. The phosphorus content of sewage sludge ash was confirmed to be 5.0 %. When $H_2SO_4$ was used as an extract, concentration of 1 N $H_2SO_4$, L/S ratio of 10, and extraction time of 30 min were found to be the optimal extraction conditions. Phosphorus was extracted by using optimal extraction conditions, and then the heavy metals eluted with phosphorus were removed using 1~20 g of cation exchange resin. In 20 g of cation exchange resin, Fe 71.3%, Cu 82.4%, Zn 79.9%, and Cr 15% were removed. After that, the mixing ratio of the calcium extract obtained from the recycled aggregate residue (RAR) was changed to 1:1, 1:5, 1:10. The pH of the SSA to RAR mixture was adjusted to 2, 4, 8 and 12 by the addition of 5 N NaOH to the mixture of 1:5, and the phosphorus was recovered as Ca-P type precipitate. The optimum pH was 8. When recycled aggregate residues were used, the weight of calcium phosphate increased, but the amount of wastewater generated also increased. Therefore, it was concluded that the use of recycled aggregate residue was not economically feasible.
Keywords
sewage sludge ash; phosphorus recovery; optimal condition; calcium phosphate type;
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