Extraction of phosphorous from thermally treated sludge and separation of aluminum by adsorption
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT(2021)
摘要
Because global phosphorus (P) resources are limited, the continued supply of this element is a concern, and the recovery of P from waste is desirable. Carbonized sludge contains aluminum (Al) and iron (Fe) as a result of the addition of coagulants added during dewatering, which hinders the effective use of recovered P. Therefore, it is necessary to develop recovery methods that extract P but not Al or Fe. Zirconium was loaded onto orange waste, a cheap and available agricultural waste in Japan, to investigate the feasibility of its utilization for phosphorus recovery. In the present study, a biomass adsorbent was applied to the selective adsorption of P following extraction using 0.25 mol/l sulfuric acid. This process, based on a batch adsorption system employing a solid-to-liquid ratio of 50 mg/ml or more, was found to adsorb close to 100% of the P but less than 6% of the Al. When the adsorbent was separated and treated with a 0.25 mol/l sulfuric acid solution at a solid-to-liquid ratio of 20 mg/ml, about 75% of the Al was removed but none of the P. Immersion in a NaOH solution was able to strip the P from the adsorbent, giving P and Al concentrations in the desorption solution of 800 and 3 mg/l, respectively.
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关键词
Activated sludge charcoal, Phosphorus adsorption, Zirconium, Extraction, Adsorption, Aluminum
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