Abstract
Processes were developed for recovering phosphate and reusing aluminum from alkaline solutions that have been used for desorbing phosphate from the spent adsorbent. The phosphate was completely recovered as the precipitate of calcium hydroxyphosphate, which can be used as fertilizer, by adding calcium chloride. The aluminum was also completely recovered as the dense precipitate of aluminum hydroxide, which can be reused for regenerating the adsorbent, by slowly adding sulfuric acid in the pH range from 11 to 10
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