Effect of ultrasonic density on partial nitrification and ammonia nitrogen removal kinetics

doi:10.16085/j.issn.1000-6613.2018-2498

Abstract

Abstract:

In order to investigate the influence of different ultrasonic density on the partial nitrification rapidly start-up, the partial nitrification start-up performance was studied by using different ultrasonic density treatment in SBR. The start-up time, nitrogen conversion, sludge performance and activity of ammonia-oxidizing bacteria (AOB) were investigated, and the variation of kinetic parameters of ammonia nitrogen removal during partial nitrification were studied. In the ultrasonic group (0.10W/mL, 0.15W/mL, 0.20W/mL, 0.25W/mL, 0.30W/mL), after 25 days of operation, the concentration of NO₂^--N reached 37.56mg/L, and the concentration of NO₃^--N was maintained below 10mg/L, the nitrite accumulation rate (NAR) was higher than 90%, and the ammonia oxidizing bacteria activity(SOURAOB) was 5.69mgO₂/(gMLSS·h), 7.91mgO₂/(gMLSS·h), 10.66mgO₂/(gMLSS·h), 12.80mgO₂/(gMLSS·h), 9.69mgO₂/(gMLSS·h), respectively. It was significantly higher than the control group [(3.93mgO₂/(gMLSS·h)].The ammonia nitrogen half-saturation constant (K_SN) of AOB obtained by double reciprocal method was 75.25mg/L, 23.15mg/L, 24.53mg/L, 9.78mg/L, 24.79mg/L, respectively. When the energy density was 0.10W/mL, K_SN of AOB was slightly larger than the control group (74.21mg/L), and the others were significantly smaller than 74.21mg/L. Therefore, ultrasonic treatment allowed AOB to preferentially obtained the substrate and achieve proliferate, and eventually rapidly realized partial nitrification.

Key words: low-intensity ultrasonic treatment, ultrasonic density, partial nitrification, rapid start-up, kinetics

摘要：

为探究不同声能密度对短程硝化快速启动的影响，在序批式生物反应器（SBR）中采用不同声能密度超声波辐照污泥进行短程硝化启动性能研究，考察了启动时间、氮素转化、污泥性能、氨氧化菌（AOB）活性的差异，并研究了启动短程硝化过程中氨氮去除动力学参数的变化。结果表明，超声组（0.10W/mL、0.15W/mL、0.20W/mL、0.25W/mL、0.30W/mL）运行25天后，NO₂^--N浓度达到37.56mg/L，NO₃^--N浓度维持在10mg/L以下，亚硝酸盐积累率均高于90%，SVI维持在200mL/g左右，氨氧化菌活性（SOUR_AOB）分别为5.69mgO₂/(gMLSS·h)、7.91mgO₂/(gMLSS·h)、10.66mgO₂/(gMLSS·h)、12.80mgO₂/(gMLSS·h)、9.69mgO₂/(gMLSS·h)，显著高于对照组[3.93mgO₂/（gMLSS·h）]，成功启动短程硝化。通过双倒数法拟合得到AOB的氨氮半饱和常数（K_SN）分别为75.25mg/L、23.15mg/L、24.53mg/L、9.78mg/L和24.79mg/L，当声能密度为0.10W/mL时略大于对照组（74.21mg/L），其他超声组均显著小于对照组，超声波辐照可使AOB优先获得基质并实现增殖，从而快速启动短程硝化。

关键词: 低强度超声波, 声能密度, 短程硝化, 快速启动, 动力学

CLC Number:

X703.1

Shuchang HUANG,Yichun ZHU,Zhang ZHANG,Xin LI,Shuai TIAN,Junfeng LIAN,Zuwen LIU. Effect of ultrasonic density on partial nitrification and ammonia nitrogen removal kinetics[J]. Chemical Industry and Engineering Progress, 2019, 38(9): 4335-4341.

黄书昌,朱易春,章璋,李鑫,田帅,连军锋,刘祖文. 声能密度对短程硝化启动及氨氮去除动力学的影响[J]. 化工进展, 2019, 38(9): 4335-4341.

Figures/Tables 6

项目	R₁	R₂	R₃	R₄	R₅	R₆
K_SN/mg·L^-1	74.21	75.25	23.15	24.53	9.78	24.79
r_N,max/h^-1	0.22	0.35	0.15	0.15	0.16	0.20
氨氮去除动力学方程	$μ = 0.22 S N 74.21 + S N$	$μ = 0.35 S N 75.25 + S N$	$μ = 0.15 S N 23.15 + S N$	$μ = 0.15 S N 23.15 + S N$	$μ = 0.16 S N 9.78 + S N$	$μ = 0.20 S N 24.79 + S N$

项目	R₁	R₂	R₃	R₄	R₅	R₆
K_SN/mg·L^-1	74.21	75.25	23.15	24.53	9.78	24.79
r_N,max/h^-1	0.22	0.35	0.15	0.15	0.16	0.20
氨氮去除动力学方程	$μ = 0.22 S N 74.21 + S N$	$μ = 0.35 S N 75.25 + S N$	$μ = 0.15 S N 23.15 + S N$	$μ = 0.15 S N 23.15 + S N$	$μ = 0.16 S N 9.78 + S N$	$μ = 0.20 S N 24.79 + S N$

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