Release and Recovery of Phosphates from Sewage Sludge
نویسنده
چکیده
Some treatment plants in operation have not been designed to fulfill the required standards of phosphorus removal. A possibility to upgrade the efficiency of phosphorus removal could be elimination of the phosphorus returned with sludge processing liquors by releasing and recovering from sewage sludge. The phosphorus recovery can occur from sewage sludge by chemical methods or from supernatant liquor by phosphate precipitation in the form of struvite. The leaching process with base or acid has shown phosphorus release from sewage sludge in the range from 70 to 100 % of the total phosphorus amount. For struvite precipitation from digested sludge supernatant a decrease was observed of phosphate concentration in the order of 95 % in the liquor.
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