Nigar ZEYNALOVA, Bülent YORULMAZ, Ahmet DEMİRAK, Feyyaz KESKİN

Arıtma Çamuru Küllerinden Kimyasal Ekstraksiyonla Fosfor Geri Kazanımının Araştırılması

Arıtma çamurlarının yakılarak bertarafı sonucu oluşan küllerin yüksek fosfor içeriğinden dolayı fosfor geri kazanımı, oluşan bu küllerin değerlendirilmesinde önemli bir seçenektir. Bu çalışmada Köyceğiz-Dalyan bölgesindeki arıtma tesisinden alınan arıtma çamurunda kimyasal ekstraksiyon yöntemi ile fosfor geri kazanımı araştırıldı. Arıtma çamurları 850 °C’de kül haline getirilmiş ve HCI, H2SO4 ve NaOH’ın farklı derişimlerdeki çözeltileri ile ekstrakte edilerek fosfor miktarları spektrofotometrik olarak tespit edilmiştir. Sonuç olarak en yüksek verim 38,3 g/kg olarak 1M H2SO4 çözeltisi ile elde edildiği belirlenmiştir. Ancak ekonomik ve çevresel faktörler göz önüne alındığında 0.05 M H2SO4 çözeltisi ile elde edilen 36 g/kg verimin daha etkin olabileceği vurgulanmıştır. Bu sonuçlarla birlikte metal toksisitesi düşük olan arıtma çamuru örneklerinin bu alandaki arıtma çamurlarından, çevresel riski daha düşük fosfor elde edileceğini göstermektedir.

Anahtar Kelimeler:

Arıtma çamuru, Fosfor geri kazanımı, Kimyasal ekstraksiyon

Investigation of Phosphorus Recovery by Chemical Extraction from Sewage Sludge Ashes

Phosphorus recovery due to the high phosphorus content of the ashes formed as a result of the burning and disposal of treatment sludge is an important option in the evaluation of these ashes. In this study, phosphorus recovery was investigated by chemical extraction method in the treatment sludge taken from the treatment plant in the Köyceğiz-Dalyan region. Treatment sludge was ashed at 850 °C and extracted with solutions of HCI, H2SO4 and NaOH in different concentrations and phosphorus quantities were detected spectrophotometrically. As a result, the highest yield was determined to be obtained with 1 M H2SO4 solution as 38.3 g/kg. However, considering the economic and environmental factors, it is emphasized that the yield of 36 g/kg obtained with 0.05 M H2SO4 solution may be more effective. These results show that treatment sludge samples with low metal toxicity will obtain phosphorus with lower environmental risk from the treatment sludge in this area.

Keywords:

Treatment sludge, Phosphorus recovery, Chemical extraction,

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