Journals / İTÜ Dergisi Seri D: Mühendislik / 2005 / Cilt: 4 - Sayı: 2
The effect of temperature on the nitrification rate in moving bed sequencin batch biofilm systems
- Pages
- 3–10
- DOI
- —
Abstract
This study investigates the effect of temperature on the nitrification rate and the maximum growth rate of an autotrophic biomass sustained in a moving bed sequencing batch biofilm reactor (MBSBBR). This type of a reactor is a novel hybrid system combining the advantages of attached and suspended activated sludge together with sequencing batch reactors. In this system, biofilm grows on small carrier elements that move along with the water in the reactor by aeration (aeration phase) or by mechanical stirring (anoxic/anaerobic phase). Experimental studies were carried out in a lab-scale MBSBBR, receiving a synthetic influent that had domestic wastewater characteristic, and operated at three different temperatures (20, 15, and 10°C). Evaluation of the results revealed that removal of organic matter at high rates and with efficiencies over 90% was secured at all operation conditions applied. Nitrification rate was significantly influenced by changes in temperature, resulting in a decrease from 0.241 g $NO_x-N$ $m^{-2}d^{-1}$ at 20°C to 0.178 g $NO_x-N$ $m^{-2}d^{-1}$ at 10°C. The same influence was observed on maximum autotrophic growth rate; values of 0.50 d-1, 0.32 $d^{-1}$, and 0.09 $d^{-1}$ at 20°C, 15°C, and 10°C were obtained, respectively. In the further studies, heterotrophic and autotrophic kinetic constants should be determined for municipal and different industrial wastewaters.
Özet
Bu çalışmada hareketli yataklı ardışık kesikli biyofilm reaktörlerinde (HYAKBR) sıcaklığın nitrifikasyon hızı ve maksimum ototrofik çoğalma hızı üzerindeki etkilerinin ortaya konulması amaçlanmıştır. Çalışma kapsamında laboratuar ölçekli bir HYAKBR’de evsel nitelikli sentetik atıksu kullanılarak üç farklı sıcaklıkta (20, 15 ve 10°C) nitrifikasyon hızı ve kinetik katsayılar belirlenmiştir. Nitrifikasyon hızı, sıcaklıktan önemli derecede etkilenmiş, 20°C için 0.241 g $NO_x-N$ $m^{-2}gun^{-1}$ ve 10°C için 0.178 g $NO_x-N$ $m^{-2}gun^{-1}$ değerini almıştır. Aynı etki, maksimum ototrofik çoğalma hızı değerleri üzerinde de görülmüş, 20°C için 0.50 $gun^{-1}$, 15°C için 0.32 $gun^{-1}$ ve 10°C için 0.09 $gun^{-1}$ olarak elde edilmiştir.