Nitrogen removal with anammox process in an UASB reactor

Abstract

Anaerobik amonyak oksidasyonu (Anammox) atıksulardan yüksek konsantrasyonlu azotun_x000B_gideriminde yeni bir yöntemdir. Bu çalısmada, altı farklı hidrolik alıkonma süresinde (HRT)_x000B_'de ve anaerobik amonyak giderim verimleri ve giderim kinetiği incelenmistir. KO?_x000B_konsantrasyonu 300 ve 1000 mg/l arasına, hidrolik alıkonma süresi 4,4 günden 0,73 güne_x000B_azalan, debisi 0,5 l/günden 3 L/güne artacak sekilde ayarlandı._x000B_UASB reaktörde farklı amonyum, nitrit, nitrat ve KO? konsantrasyonlarındaki sentetik_x000B_atıksuyun amonyum, nitrit, nitrat ve KO?, giderim verimleri arastırıldı toplam azot gazı,_x000B_hidrojen sülfür gazı, metan gazı üretimi ve metan yüzdesi oranları hesaplandı. Maksimum_x000B_amonyum giderim verimi, KO? konsantrasyonu 600 mg /L, nitrit konsantrasyonu 131 mg/ L,_x000B_nitrat konsantrasyonu 0,1 mg/L iken % 55 olarak bulunmustur. Hidrolik bekleme süreleri bu_x000B_esnada 4.4 gündür. Giris atık suyu için COD/NH4-N/NO3-N/NO2-N oranları 20/2/2.6/1 ve_x000B_15/1.25/1/2.5 arasında iken Maksimum nitrit-azotu giderimi %100 dür . Hidrolik bekleme_x000B_süreleri bu esnada 2.2 gün ,1.1 gün ve 0.73 gündür. Maksimum KOI giderimi % 90 olarak_x000B_bulunmustur. Bu esnada giris amonyum, nitrit, nitrat ve KO?, oranları 6:1:1.3, hidrolik_x000B_bekleme süresi 4.4 gündür. Sürekli çalısmalarda, maksimum azot gazı üretimi 130,4 l/gün,_x000B_olarak bulunmustur, bu durum bize UASB reaktörde anaerobik kosullarda amonyak_x000B_gideriminin olustuğunu (anammox) göstermistir. UASB rektörde yapılan kinetik çalısmalar_x000B_amonyak azotu ve KOI' nin Stevor Kin-Cannon and Grau Second order Kinetic modellerine_x000B_göre giderildiğini göstermistir. UASB reaktörde anammox prosesi için uygun bulunmustur. Anaerobic ammonia oxidation (ANAMMOX) is a novel process in which is a new_x000B_powerful tool especially for remove the strong nitrogenous wastewaters. In this study, the_x000B_anaerobic ammonia removal efficiencies was investigated in an UASB RECTOR and_x000B_ammonia and COD removal kinetics was researched at six different hydraulic retention times_x000B_(HRT). The COD concentrations were adjusted between 300 and 1000 mg/L and HRTs were_x000B_decreased from 4,4 to 0,73 days by adjusting the up-flow rates from 0,5 to 3 l/d. Thought_x000B_continuous operation of anammox -UASB reactor using synthetic wastewater for 294 days._x000B_Ammonium, nitrit, nitrat and chemical oxygen demand (COD), removal efficiencies, total,_x000B_nitrogen gas, hydrogen sulfide gas, metan gas productions and methane percentage ratios_x000B_were investigated in UASB reactor at different Ammonium, nitrit, nitrat and chemical oxygen_x000B_demand (COD) concentration, and decreasing HRTs. The maximum ammonium removal_x000B_efficiency was found as 55 % when the influent nitrit, nitrat and chemical oxygen demand_x000B_(COD)concentrations were 600 mg/l 131 mg/L, 0,1 mg/L, respectively in run 1 at a HRT of_x000B_4,4 days. The maximum nitrit removal efficiency was 100 % when the influent COD/NH4-_x000B_N/NO3-N/NO2-N ratios were between 20/2/2.6/1 and 15/1.25/1/2.5 in runs 3,4 and 5 at_x000B_HRTs of 2, 1,1 and 0,73 days. The maximum COD removal efficiency was obtained as %90_x000B_when the COD/NH4-N/NO3-N ratios were 6:1:1,3 in runs 1 and 2 at a HRT of 4.4 days._x000B_The maximum nitrogen gas production was found as 130,4 l/day, in continuous operation of_x000B_the UASB reactor indicating the anaerobic ammonia removal process (anammox process)_x000B_occurred. The kinetic studies performed in the UASB reactor showed that Stover Kin-cannon_x000B_and Grau kinetic models were meaningful for ammonia and COD removal in the UASB_x000B_rector.