Effect of hydraulic retention time on ABR tail water treatment by contact oxidation process under low oxygen condition

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Huang, Xiaolong^1,2 ; Shi, Chunhong^1,2 ; Wang, Zhenbao^1,2 ; Jiang, Kai^1,2

School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing

100083, China^1

Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing

100083, China^2

关键词: Biological contact oxidation;    Contact oxidation;    Hydraulic retention time;    Low dissolved oxygen;    Low oxygen conditions;    National standard;    Removal of cods;    Removal rate of cods;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/2/022020/pdf
DOI  :  10.1088/1755-1315/121/2/022020

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Biological contact oxidation process of low dissolved oxygen was applied to the treatment of ABR tail water, which were pretreatment effluent for Island sewage. The reactor was built and filled with polyurethane suspension filler as carrier for biofilm growth in laboratory. The dissolved oxygen in the reactor is kept at 1.3-1.8mg/L to distinguish between traditional method which is 2.5-3.5mg/L. Influence of hydraulic retention time(HRT) on ABR tail water treatment by the process was studied. Results show that the system has good effect on removal of COD and TN under this condition. When HRT is among 4h to 12h, the removal rate of COD can be maintained at 80-90%.From period 1 to period 3, the removal rate of NH4+N and TN at the end of each period can be recovered to a higher level, and the average removal rate after stabilization is 99% and 67% respectively which can come up to first grade of the national standard GB18918-2002. It is remarkable that when HRT is 4h, the removal rate of NH4+-N and TN showed a significant decrease trend, the concentration of effluent was 14.79mg/L and 19.5mg/L, respectively.