Phosphorus Recovering from Carbonized Sewage Sludge by Hydrothermal Processes

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  • 水熱法による炭化汚泥からのリン回収
  • スイネツホウ ニ ヨル タンカ オデイ カラ ノ リン カイシュウ

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Abstract

In order to establish the phosphorus recovering technique from charcoal of sewage sludge, studies on the alkali-extraction methods using sodium hydroxide are going way. Phosphorus is thought to exist as a form of aluminum phosphate in the sludge. Aluminum phosphate is expected to react with silicone components in the sludge in addition to the sodium compounds under hydrothermal condition, and form a zeolite like substances. Consequently, aluminum free phosphorus reacts with sodium compounds to form sodium phosphate, and can be easily extracted from them. Based on this idea, investigation of phosphorus recovery from carbonized sewage sludge was investigated. Carbonized sewage sludge was mixed with sodium hydroxide aqueous solution, and treated in hydrothermal conditions. After this treatment, phosphorus was successfully recovered from charcoal of sewage sludge. The phosphorus was considered sodium phosphate（Na3PO4）, and the recovering rate was estimated to be about 60%. The charcoal treated by this method has lower concentration of phosphorus, and can be more useful compared to a non-treated one because of its lower phosphorus concentration.

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