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Extraction of raw sewage sludge containing iron phosphate for phosphorus recovery |
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| Authors: | Akira Sano Makoto KanomataHiroki Inoue Norio SugiuraKai-Qin Xu Yuhei Inamori |
| Institution: | a Environmental Restoration and Conservation Technology Section, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan b Agrobiological Resource Sciences and Technology, Graduate School of Life and Environmental Sciences, Tsukuba University, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan c The Building Center of Japan, Testing Laboratory for Wastewater Treatment Tanks, Oyama, Inashiki-gun, Ibaraki 300-0402, Japan d School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China e Facility of Symbiotic System Science, Fukushima University, 1 Kanayagawa, Fukushima 960-1296, Japan |
| Abstract: | The objective of the present study was to establish an alkali extraction technology for FePO4-containing sewage sludge obtained from a wastewater treatment system that includes phosphorous removal by iron electrolysis. By clarifying the extraction properties of phosphorous, organic matter, and inorganic matter, conditions for alkali extraction were optimized. As a result, it was suggested that unheated phosphorous extraction would be superior for FePO4-containing sewage sludge. And, extraction methods and sewage sludge properties were also compared, and the noteworthy result that extraction of metals can be suppressed to extremely low amounts with alkali extraction as compared with acid extraction was obtained. A new insight was also gained that, as compared with the use of incinerated ash reported in previous studies, alkali extraction was more efficient when raw sewage sludge was used. |
| Keywords: | Sewage sludge Phosphorus recovery Alkali extraction Iron phosphate |
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