Effect of HRT on Denitrifying Phosphorus and Nitrogen Removal in Modified A2/O-BAF

被引：1
|
作者：
Zhao K.-L. [1 ,2 ]
Liu A.-D. [1 ,2 ]
Nan Y.-B. [1 ,2 ]
Liang L.-M. [1 ,2 ]
Wang Y.-X. [1 ,2 ]
Chen Y.-Z. [1 ,2 ]
机构：
[1] School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou
[2] Technical Center of Sewage Treatment Industry in Gansu, Lanzhou
来源：
Huanjing Kexue/Environmental Science | 2020年 / 41卷 / 06期
关键词：
Denitrifying phosphorus removal probability density; Formula of material balance for COD; Hydraulic retention time(HRT); Sludge activity; ΔPO[!sub]4[!/sub] [!sup]3-[!/sup]/ΔNO[!sub]3[!/sub] [!sup]-[!/sup]-N;
D O I：
10.13227/j.hjkx.201907167
中图分类号：
学科分类号：
摘要：
The effect of hydraulic retention time (HRT) on denitrifying phosphorus and nitrogen removal in a modified two sludge A2/O-BAF system was studied. The influent COD, NH4 +-N, and TP were 189.6, 60.4, and 5.1 mg•L-1, respectively. When HRT was 9, 8, 7, and 6 h, the average effluent COD was less than 42 mg•L-1. The average effluent NH4 +-N levels were 2.4, 2.8, 3.3, and 6.5 mg•L-1, respectively. The average effluent TP values were 0.3, 0.4, 0.7, and 0.8 mg•L-1, respectively. The ratio of the denitrifying phosphorus accumulation organisms (DPAOs/PAOs) in the system of anoxic zone was reduced from 76.8% to 48.8%. When HRT was 8 h, the ratio of denitrifying phosphorus to nitrogen (ΔPO4 3-/ΔNO3 --N) was increased by 37.5% by a mathematical statistics method. The ΔPO4 3-/ΔNO3 --N in the anoxic zone was 1.24 (the theoretical value is 1.41). At this time, the effect of denitrifying phosphorus to nitrogen was the best. The SVI value was lower than 100 mL•g-1 throughout the experiment, and the MLVSS/MLSS gradually decreased from 0.74 to 0.63, indicating that the sludge activity was reduced. © 2020, Science Press. All right reserved.
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页码：2771 / 2778
页数：7
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