Evaluation of the Solubility and Dewaterability of Sludges Treated with Different Disintegration Methods

Yıl 2024, Cilt: 29 Sayı: 2, 479 - 488, 30.08.2024

Fatma Olcay Topaç , Melike Yalılı Kılıç

https://doi.org/10.17482/uumfd.1488231

Öz

Sludge disintegration methods are particularly used as pretreatment techniques prior to the anaerobic digestion of waste sludge, and they can improve various sludge characteristics. In this study, hydrodynamic cavitation, acidic disintegration, and alkaline disintegration methods were applied to waste activated sludge obtained from a wastewater treatment plant of a canned food production facility. The changes in soluble chemical oxygen demand (SCOD), capillary suction time (CST), and centrifugal settleability index (CSI) were examined, and the effects of the applied methods on sludge solubility and dewaterability were compared. All disintegration methods applied in the study positively influenced the solubility of waste activated sludge and significantly increased the SCOD concentration in the sludge. Among the applied methods, hydrodynamic cavitation and alkaline disintegration (at pH 11) were found to be the most effective in increasing sludge solubility. On the other hand, these methods, which significantly increased sludge solubility, were also found to increase CST and CSI values, indicating a negative impact on the dewatering performance of the sludge.

Anahtar Kelimeler

Waste activated sludge, sludge disintegration, capillary suction time, soluble COD, centrifugal settleability index

FARKLI DEZENTEGRASYON YÖNTEMLERİYLE İŞLEM GÖRMÜŞ ÇAMURLARIN ÇÖZÜNEBİLİRLİKLERİNİN VE SUYUNU VERME ÖZELLİKLERİNİN DEĞERLENDİRİLMESİ

Öz

Çamur dezentegrasyon yöntemleri özellikle atık çamurların anaerobik çürütülmesinden önce ön arıtım yöntemi olarak kullanılmakta ve çeşitli çamur özelliklerinde iyileşmeler sağlayabilmektedir. Bu çalışmada, konserve gıda üretimi yapan bir işletmenin atıksu arıtma tesisinden alınan atık aktif çamura hidrodinamik kavitasyon, asidik dezentegrasyon ve alkali dezentegrasyon yöntemleri uygulanmış, çözünebilir kimyasal oksijen ihtiyacı (ÇKOİ), kapiler emme süresi (KES) ve santrifüjlenebilir çökelebilirlik indeksi (SÇİ) değerlerinde meydana gelen değişimler incelenmiş ve uygulanan yöntemlerin, çamur çözünebilirliği ile susuzlaştırılabilirliği üzerindeki etkileri kıyaslanmıştır. Çalışmada çamura uygulanan tüm dezentegrasyon yöntemleri atık aktif çamurun çözünebilirliğini olumlu yönde etkilemiş ve çamurdaki ÇKOİ konsantrasyonunu önemli derecede arttırmıştır. Uygulanan yöntemler içerisinde çamurun çözünebilirliğini en fazla arttıran yöntemlerin hidrodinamik kavitasyon ve alkali dezentegrasyon (pH 11) olduğu tespit edilmiştir. Diğer yandan çamurun çözünebilirliğini en fazla arttıran bu yöntemlerin çamurun KES ve SÇİ değerlerini de arttırdığı, yani çamurun su verme performansını olumsuz yönde etkilediği sonucuna ulaşılmıştır.

Anahtar Kelimeler

Atık aktif çamur, çamur dezentegrasyonu, kapiler emme süresi, çözünebilir KOİ, santrifüjlenebilir çökelebilirlik indeksi

Kaynakça

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