期刊
BIODEGRADATION
卷 28, 期 5-6, 页码 437-452出版社
SPRINGER
DOI: 10.1007/s10532-017-9807-8
关键词
Anammox; Influent substrate ratio; Nitrogen removal performance; Kinetic analysis
资金
- National Natural Scientific Foundation [41376016]
- Shandong Provincial Natural Science Foundation [BS2015HZ007]
- Shandong Province Higher Educational Science and Technology Program [J15LC61]
Effect of influent substrate ratio on anammox process was studied in sequencing batch reactor. Operating temperature was fixed at 35 +/- 1 degrees C. Influent pH and hydraulic retention time were 7.5 and 6 h, respectively. When influent NO2--N/NH4+-N was no more than 2.0, total nitrogen removal rate (TNRR) increased whereas NH4+-N removal rate stabilized at 0.32 kg/(m(3) d). Delta NO2--N/Delta NH4+-N increased with enhancing NO2--N/NH4+-N. When NO2--N/NH4+-N was 4.5, Delta NO2--N/Delta NH4+-N was 1.98, which was much higher than theoretical value (1.32). The IC50 of NO2--N was 289 mg/L and anammox activity was inhibited at high NO2--N/NH4+-N ratio. With regard to influent NH4+-N/NO2--N,the maximum NH4+-N removal rate was 0.36 kg/(m(3) d), which occurred at the ratio of 4.0. Anammox activity was inhibited when influent NH4+-N/NO2--N was higher than 5.0. With influent NO3--N/NH4+-N of 2.5-6.5, NH4+-N removal rate and NRR were stabilized at 0.33 and 0.40 kg/(m(3) d), respectively. When the ratio was higher than 6.5, nitrogen removal would be worsened. The inhibitory threshold concentration of NO2--N was lower than NH4+-N and NO3--N. Anammox bacteria were more sensitive to NO2--N than NH4+-N and NO3--N. TNRR would be enhanced with increasing nitrogen loading rate, but sludge floatation occurred at high nitrogen loading shock. The Han-Levenspiel could be applied to simulate nitrogen removal resulting from NO2--N inhibition.
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