Effect of Thermal And Chemical Disintegratıon on The Enhance of Biogas Production in Waste Activated Sludge

Abstract

Sludge disintegration methods are pre-treatment methods applied to eliminate the hydrolysis phase, which is the rate limiting step in the decay process of wastewater sludge, to increase the degree of stabilization and the amount of biogas formed. In this study, the effect of different disintegration methods (thermal and chemical) on the solubility of the sludge was investigated by examining the changes in the dissolved chemical oxygen demand parameter. In the studies conducted within the scope of thermal disintegration, waste activated sludge is subjected to heat treatment in block heaters in closed tubes. In the case of alkali disintegration experiments, NaOH was added such that the waste activated sludge pH was 10 and 11.
As a result of the study, biogas production was found 202.5, 189.8, 104 and 80.5 ml from thermal disintegration, alkaline disintegration, inoculum+raw sludge and inoculum sludge in a result of BMP test, respectively. Both of the chemical disintegration and thermal disintegration methods applied within the scope of the study have positively affected the efficiency of biogas. Thermal disintegration method seems to be more effective method in terms of biogas productivity. 

Keywords

• waste activated sludge
• biochemical methane potential
• chemical disintegration
• thermal disintegration
• sludge disintegration

ATIK AKTİF ÇAMURDA BİYOGAZ ÜRETİMİNİN ARTIRILMASINA TERMAL VE KİMYASAL DEZENTEGRASYONUN ETKİSİ

Abstract

Çamur dezentegrasyon yöntemleri, atıksu çamurunun çürüme sürecinde hız sınırlayıcı adım olan hidroliz fazını ortadan kaldırmak, oluşan biyogaz miktarını ve stabilizasyon derecesini artırmak için uygulanan ön işlem yöntemleridir. Bu çalışmada, çözünmüş kimyasal oksijen ihtiyacı parametresindeki değişimler incelenerek farklı dezentegrasyon yöntemlerinin (termal ve kimyasal) çamurun çözünürlüğüne etkisi araştırılmıştır. Termal dezentegrasyon kapsamında yapılan çalışmalarda atık aktif çamur, kapalı tüplerdeki blok ısıtıcılarda ısıl işleme tabi tutulmuştur. Kimyasal(alkali) dezentegrasyon için, atık aktif çamurun pH'ı 10 ve 11 olacak şekilde NaOH ilave edilmiştir.
Çalışma sonucunda, BMP testi ile termal dezentegrasyon, alkali dezentegrasyon, aşı+ham çamur ve aşı çamurundan biyogaz üretimi sırasıyla 202.5, 189.8, 104 ve 80.5 ml olarak bulunmuştur. Çalışma kapsamında uygulanan kimyasal ve termal dezentegrasyon yöntemlerinin her ikisi de biyogazın verimini olumlu yönde etkilemiştir. Biyogaz verimliliği açısından termal dezentegrasyon yöntemi daha etkili bir yöntem gibi görünmektedir.

Keywords

• atık aktif çamur
• biyokimyasal metan potansiyeli
• çamur dezentegrasyonu
• termal dezentegrasyon
• kimyasal dezentegrasyonu

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