Utilization of incineration ashes of sewage sludge as the fertilizer

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  • 下水汚泥焼却灰の緑農地利用に関する研究
  • ゲスイ オデイ ショウキャクバイ ノ リョクノウチ リヨウ ニ カンスル ケンキュウ

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In order to effective utilize the sewage sludge as the fertilizer; we clarified the characteristics of the incineration ashes of sewage sludge. Concentration of cadmium and lead contained in the incineration ashes material decreased dramatically with burnt up at temperature more than 700°C, as result of volatilization. Zinc and cupper contained in ashes of sewage sludge did not decreased after burnt up at temperature of 950°C but were transformed into in-soluble form by incineration treatments. Sequential fraction of heavy metals as affected by application of the incineration ashes material to soil was analyzed. A greenhouse experiment was conducted to compare the effect of application on the growth of grasses species. Application effect of phosphorus contained in the ashes was larger than that contained in the dried sludge cakes.

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