EFFECT OF DISSOLVED OXYGEN AND CHEMICAL OXYGEN DEMAND TO NITROGEN RATIOS ON THE PARTIAL NITRIFICATION/DENITRIFICATION PROCESS IN MOVING BED BIOFILM REACTORS

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ZAFARZADEH ALI; BINA BIJAN; NIKAEEN MAHNAZ; MOVAHEDIAN ATTAR HOSSEIN; HAJI KHIADANI MEHDI

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Journal: Iranian Journal of Biotechnology Year:2011 | Volume:9 | Issue:3 Page(s): 197-205

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Title

EFFECT OF DISSOLVED OXYGEN AND CHEMICAL OXYGEN DEMAND TO NITROGEN RATIOS ON THE PARTIAL NITRIFICATION/DENITRIFICATION PROCESS IN MOVING BED BIOFILM REACTORS

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Keywords

DISSOLVED OXYGENQ3

CODQ2

NQ2

MOVING BED BIOFILM REACTORS (MBBRS)Q2

PARTIAL NITRIFICATIONQ2

Abstract

Partial nitrification was reported to be technically feasible and economically favorable, especially for wastewater with high ammonium concentration or low C/N ratio. In this study, the effect of DISSOLVED OXYGEN (DO) and influent ratio of chemical oxygen demand to nitrogen (COD/N) ratio on biological nitrogen removal from synthetic wastewater was investigated. Experiments were conducted in moving bed biofilm reactors (MBBRs) on PARTIAL NITRIFICATION process in pilot-plant configuration for 300 days. DO levels were changed from 0.04 to 0.12 and 0.42 to 3.4 mg/l in the anoxic (R1) and aerobic (R2) reactors, respectively. The optimum DO for PARTIAL NITRIFICATION was between 1-1.5 mg/l in the aerobic reactor (R2). Influent COD/N ratios between 20 and 2 g COD/g-N were tested by changing the nitrogen loading rate (NLR) supplied to the pilot plant. During operational conditions when the DO concentration in aerobic reactor was above 1 mg/l, near complete organic carbon removal occurred in the total MBBRs system. The effluent total nitrogen concentration in the operational conditions (1.7-2.1 mg O2/l and NH+4-N=35.7 mg N/l) was obtained in the range of 0.85-2 mg/l. The highest nitrite accumulation (50%- 52%) took place at the DO concentration of 1-1.5 mg/l and increased with decreasing COD/N ratio in aerobic reactor (R2). This study showed that the average nitrification rate at various COD/N ratios is about 0.96 gN/m2 perday while the maximum nitrification rate is about 2 gN/m2 per day at COD/N ratios lower than 6.The experimental COD/N ratio for denitrification was close to complete sum of NO2 - and NO3 - (NOx) removal efficiency (about 99%) at COD/N ratio equal 14 in the operational conditions in the anoxic reactor (R1).

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APA: Copy

ZAFARZADEH, ALI, BINA, BIJAN, NIKAEEN, MAHNAZ, MOVAHEDIAN ATTAR, HOSSEIN, & HAJI KHIADANI, MEHDI. (2011). EFFECT OF DISSOLVED OXYGEN AND CHEMICAL OXYGEN DEMAND TO NITROGEN RATIOS ON THE PARTIAL NITRIFICATION/DENITRIFICATION PROCESS IN MOVING BED BIOFILM REACTORS. IRANIAN JOURNAL OF BIOTECHNOLOGY, 9(3), 197-205. SID. https://sid.ir/paper/139202/en

Vancouver: Copy

ZAFARZADEH ALI, BINA BIJAN, NIKAEEN MAHNAZ, MOVAHEDIAN ATTAR HOSSEIN, HAJI KHIADANI MEHDI. EFFECT OF DISSOLVED OXYGEN AND CHEMICAL OXYGEN DEMAND TO NITROGEN RATIOS ON THE PARTIAL NITRIFICATION/DENITRIFICATION PROCESS IN MOVING BED BIOFILM REACTORS. IRANIAN JOURNAL OF BIOTECHNOLOGY[Internet]. 2011;9(3):197-205. Available from: https://sid.ir/paper/139202/en

IEEE: Copy

ALI ZAFARZADEH, BIJAN BINA, MAHNAZ NIKAEEN, HOSSEIN MOVAHEDIAN ATTAR, and MEHDI HAJI KHIADANI, “EFFECT OF DISSOLVED OXYGEN AND CHEMICAL OXYGEN DEMAND TO NITROGEN RATIOS ON THE PARTIAL NITRIFICATION/DENITRIFICATION PROCESS IN MOVING BED BIOFILM REACTORS,” IRANIAN JOURNAL OF BIOTECHNOLOGY, vol. 9, no. 3, pp. 197–205, 2011, [Online]. Available: https://sid.ir/paper/139202/en

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