SONGZhuang-zhuang,LüShuang,ZHOUShun,et al.Effect of NO2--N to NH4+-N Ratio on Nitrogen and Carbon Removal Performance of Simultaneous ANAMMOX and Denitrification Process[J].China Water & Wastewater,2022,38(21):20-29.
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Effect of NO2--N to NH4+-N Ratio on Nitrogen and Carbon Removal Performance of Simultaneous ANAMMOX and Denitrification Process

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第21期 Page: 20-29 Column: Date of publication: 2022-11-01
Author(s):
SONG　Zhuang-zhuang1;  Lü　Shuang2;  ZHOU　Shun3;  ZHANG　Zhi3
（1. Municipal Planning and Engineering Design Institute， Jiangsu Provincial Planning and Design Group Co. Ltd.， Nanjing 210036， China； 2. Jiangsu Branch， North China Municipal Engineering Design & Research Institute Co. Ltd.， Nanjing 210019， China； 3. College of Environmental and Ecology， Chongqing University， Chongqing 400045， China）
Keywords:
NO2--N to NH4+-N ratio;  simultaneous ANAMMOX and denitrification (SAD);  nitrogen and carbon removal;  sludge activity
Abstract:
Continuous flow test and batch test were carried out respectively to investigate the effect of different substrate ratios (NO2--N/NH4+-N) on nitrogen and carbon removal performance of simultaneous ANAMMOX and denitrification (SAD) process. During the fluctuation of influent NO2--N/NH4+-N, the NO2--N removal effect of SAD process remained good. The removal rate of NH4+-N decreased slightly, but still remained above 90%. The removal rate of COD was relatively stable, indicating that the SAD process had good impact resistance to influent NO2--N/NH4+-N fluctuation. When the influentNO2--N/NH4+-N were 1.69-1.95 and 1.38-1.42, denitrification was enhanced, and the NO2--N/NH4+-N and contribution rate of denitrification for nitrogen removal was higher. The effluent NO3--N and ΔNO3--N/ΔNH4+-N were also higher than those when the influent NO2--N/NH4+-N were 0.58-0.60 and 0.77-0.83. When the influent NO2--N/NH4+-N was between 1.69 and 1.95, the denitrification activity of sludge was significantly enhanced. After the recovery of NO2--N/NH4+-N, the ANAMMOX activity and the denitrification activity of the upper sludge decreased, and the denitrification activity of the lower sludge increased and was higher than that of the upper sludge. In a typical cycle, NO2--N and NH4+-N concentrations decreased linearly in the first 10 h, and gradually stabilized after 10 h. NO3--N concentration increased first and then decreased, which reached a maximum value in 10-12 h. With the increase of the influent NO2--N/NH4+-N, the maximum NO3--N concentration gradually increased. After 24 h of reaction, ΔNO2--N/ΔNH4+-N, COD removal rate and contribution rate of denitrification for nitrogen removal all showed an overall upward trend with the increase of the influent NO2--N/NH4+-N.
Last Update: 2022-11-01