Biological nitrogen removal with excess nitrogen uptake by microorganisms

• Published in: Huanjing kexue Vol. 30; no. 8; p. 2320
• Main Authors: Deng, Jiu-hua, Wang, Dong-bo, Li, Xiao-ming, Zeng, Guang-ming
• Format: Journal Article
• Language: Chinese
• Published: China 15.08.2009
• Subjects: Bacteria, Aerobic - metabolism; Biodegradation, Environmental; Bioreactors - microbiology; Hydrogen-Ion Concentration; Nitrates - isolation & purification; Nitrates - metabolism; Nitrogen - isolation & purification; Nitrogen - metabolism; Quaternary Ammonium Compounds - isolation & purification; Quaternary Ammonium Compounds - metabolism; Waste Disposal, Fluid - methods; Water Pollutants, Chemical - isolation & purification
• ISSN: 0250-3301

The performance of nitrogen removal with sequencing batch reactors were investigated in different pH conditions using simulated municipal wastewater. The experimental results showed that ammonium and nitrate as well as nitrite in R2 (pH controlled at 8.0 +/- 0.2) were 0-1 mg x L(-1) and 8-10 mg x L(-1) respectively, while ammonium and nitrate as well as nitrite in R1 (pH controlled at 7.0 +/- 0.2) were 0-5 mg x L(-1) and 1-2 mg x L(-1) respectively under the operational process of 4-hour aeration --> 4-hour settle/idle phase, which indicated the removal rates of TIN (TIN = NH4+ -N + NO3- -N + NO2- -N) in R1 and R2 were above 85% and about 70% respectively, when the COD and ammonium concentrations in influent were 250-300 mg x L(-11), 30-40 mg x L(-1), respectively. Total nitrogen in sludge was at a high level and increased in the aeration after decreasing in the first hour aeration, the content of total nitrogen in sludge was 214 mg x g(-1) at the beginning of aerobic phase, 210 mg x g(-1) in the first aerati