Page 150 - 精细化工2019年第10期

第 36 卷第 10 期 精 细 化 工 Vol.36, No.10
2019 年 10 月 FINE CHEMICALS Oct. 2019

水处理技术与环境保护
好氧氨氧化生物膜内氧传质特性及影响因素

2
韩越梅 1,2 ，刘志军
（1. 大连大学 机械工程学院，辽宁 大连 116622；2. 大连理工大学 化工机械与安全学院，辽宁 大连
116024）

摘要：采用理论计算和实验测试相结合的方法，对流化床反应器中好氧氨氧化生物膜内溶解氧传质特性及影响
因素进行了分析。建立了综合考虑反应-扩散-对流作用的一维模型，计算结果表明：溶解氧所能到达的生物膜厚
度受渗流速度等因素的影响；增大渗流速度、扩散系数和进水底物浓度均可以提高膜内溶解氧浓度的最大值。
建立了序批式流化床生物膜反应器，获得了高于 80%的氨氮转化率，实现了好氧氨氧化生物膜的成功挂膜，获
得生物膜厚度为 0.1~0.3 mm，采用微电极测试了膜内溶解氧浓度。实验测试和模型计算结果表明，溶氧浓度沿
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生物膜厚度方向均呈现出抛物线形的不均匀下降趋势，且当扩散系数为 2.2×10 m /s 和渗流速度为 6.0 mm/s 时，
测试结果和计算数值具有较好的吻合度。
关键词：好氧氨氧化；生物膜；一维模型；序批式流化床反应器；水处理技术
中图分类号：X703.1 文献标识码：A 文章编号：1003-5214 (2019) 10-2116-07

Mass Transfer Performance and Influence Factors on Dissolved Oxygen
Inside of Ammonium Oxidizing Biofilm

1,2
2
HAN Yue-mei , LIU Zhi-jun
（1. College of Mechanical Engineering, Dalian University, Dalian 116622, Liaoning, China; 2. School of Chemical
Machinery and Safety Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China）

Abstract: The mass transfer performance and influence factors on dissolved oxygen inside of ammonium
oxidizing bacteria biofilm in fluid-bed bioreactor were analyzed based on the theatrical modelling and
experiments. A one-dimensional model of reaction-diffusion-convection mixing was established. The
results show that the seepage velocity and diffusivity have a great effect on the max depth of biofilm
reached by dissolved oxygen. The higher the seepage velocity, diffusivity and feeding matrix concentration
are, the higher dissolved oxygen concentration is inside of the biofilm. A sequencing batch biofilm reactor
(SBR) was set up to culture aerobatic biofilm enriched by ammonia oxidation bacteria (AOB). Organic was
added to accelerate the biofilm culture process in the startup phase. More than 80% of ammonia in the
influent was converted to nitrite and the biofilm with a thickness of 0.1~0.3 mm was achieved. Oxygen
concentration along the direction of the biofilm depth was tested by PA2000 oxygen microelectrode. The
results from experiments and model calculation demonstrate that the change of dissolved oxygen
concentration along the direction of biofilm depth presents a parabolic and non-uniform downward trend.
2
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When the diffusion coefficient was 2.2×10 m /s and the seepage velocity was 6.0 mm/s, the test results
and the calculated values had a good agreement.
Key words: aerobic ammonia oxidation; biofilm; one-dimensional model; sequencing batch biofilm reactor;
water treatment

好氧氨氧化反应，即亚硝化（partial nitrification， bacteria，简称 AOB）的作用下将氨态氮氧化成亚硝
简称 PN）是在好氧氨氧化细菌（ammonium-oxidizing 态氮的过程，是传统废水脱氮处理工艺硝化反硝化

收稿日期：2019-02-12; 定用日期：2019-05-09; DOI: 10.13550/j.jxhg.20190113
基金项目：国家自然科学基金（11502046）；辽宁省自然科学基金指导计划（20170540042）
作者简介：韩越梅（1972—），女，博士，E-mail：hanyuemei@dlu.edu.cn。