ANAEROBİK ÇÜRÜTÜCÜ SUYUNDAN PİLOT ÖLÇEKLİ AKR SİSTEMİ İLE BİYOLOJİK AZOT GİDERİMİNİN OPTİMİZE EDİLMESİ

Öz

Pilot ölçekli tek kademe ardışık kesikli reaktör (AKR) uygulaması ile anaerobik çamur çürütücü süzüntü suyundan (AÇSS) N, P ve organik madde giderimi 2 ve 4 fazlı ve farklı sıralı olarak çalışılmıştır. Biyolojik azot gideriminde kısmi nitrifikasyon ve nitrit üzerinden denitrifikasyon (denitritasyon) prosesleri uygulanmıştır. Azot giderimine etki eden iki sınırlayıcı faktör, amonyum için bikarbonat ve nitrit için basit yapıda organik madde eksikliği olarak oluşmuştur. Nitritasyonla eşzamanlı organik maddenin oksitlenmesi, teorik alkalinite gereksinimini düşürürken oluşan uçucu yağ asitleri (UYA) denitritasyonu desteklememiştir. Fosfat sadece biyosentez amaçlı giderilmiştir. Aerobik oksidasyonda oluşan UYA’nın denitritasyonla gideriminin çok düşük seviyede kalması UYA’nın sistemde oluşan fakültatif bakterilerin tüketebileceğinden daha kompleks yapıda oluştuğunu göstermektedir. Yüksek UYA gideriminin elde edildiği durumda ise AÇSS ile gelen anaerobik bakterilerin etkin olduğu gözlenmiştir. Elde edilen nitritasyon hızları artan amonyum yükleme hızında artış göstermiş ve 20 oC için literatürle uyumlu olarak elde edilmiştir. Çamur yaşı nitrifikasyon için gerekli seviyelerde elde edilmiştir. Sonuçlar, AKR teknolojisi ile kısmi nitrifikasyonun gerçekleşmesi için yüksek sıcaklık ve düşük çamur yaşı ihtiyacı olmadığını göstermiştir.

Anahtar Kelimeler

• Azot, biyolojik arıtım, AKR, anaerobik çürütücü süzüntü suyu.

Optimization of Biological Nitrogen Removal from Anaerobic Reject Water at Pilot-scale SBR System

Öz

Anaerobic reject water (ARW) treatment at pilot-scale sequential batch reactor (SBR) was conducted with 2 and 4-phase at mixed order for N, P and organic matter removal. Short-cut biological nitrogen removal (SBNR) process was implemented with partial nitrification and denitrification over nitrite. Bicarbonate and simple structure organic matter defiencies were determined as the two major limiting factors. Simultaneous organic matter oxidation with nitritation reduced theoratical alkalinity requirement whereas volatile fatty acids (VFA) produced did not promote denitritation. Phosphate was removed onyl via biosynthesis. VFA proved to be of complex structure and not amenable for facultative bacteria. In case of high VFA degradation anaerobic bacteria transported with ARW was believed to be efficient. Nitritation rates were competible with the reported values at 20 oC and increased with increasing ammonium loading rate. Sludge age was obtained at an optimum level for nitrification without control. Results showed that high temperature and low sludge age are not necessarily required for partial nitrification at SBR technology.

Anahtar Kelimeler

• Nitrogen, biological removal, SBR, anaerobic reject water, side-line treatment

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