曝气动力双侧横向内循环反应器数值模拟和脱氮机理

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Abstract A novel airlift dual transverse internal-loop (ADTL) reactor was set up and operated for the treatment of synthetic municipal wastewater, aiming to eliminate internal circulation energy consumption of conventional biological nitrogen removal process. The key structural parameters, such as the ratio of top clearance height to liquid level height (H_tc/H_l), bottom clearance height/liquid level height (H_bc/H_l) and A/O, were optimized by Computational Fluid Dynamics (CFD) simulation. Subsequently, an optimized ADTL reactor was long-term operated to investigate nitrogen removal performance, functional bacterial activity, enzymatic activity, and microbial community structure characteristics. The CFD numerical simulation results revealed that when the H_tc/H_l、H_bc/H_l and A/O were 0.08,0.08 and 1:1, respectively, the liquid circulation velocity and liquid flow uniformity of the ADTL reactor were better. The long-term operating performance of the reactor demonstrated that, in comparison with the conventional internal circulation mode, the ADTL mode achieved an 11.96% increase in total nitrogen removal efficiency. In addition, the ratio of specific nitrite utilization rate to specific ammonia utilization rate (SNUR/SAUR) decreased from 1.71 to 1.13, while the ratio of specific nitrite reduction rate to specific nitrate reduction rate (NIRR/NARR) increased from 0.39 to 0.66. Corresponding trends were also observed in the enzymatic activity ratios. Additionally, Illumina MiSeq sequencing analysis revealed significant increases in the abundance of nitrite-reducing bacteria such as Levilinea (21.58%), Melioribacter (4.54%), and Burkholderia (1.71%) during the ATDL stage. Conversely, the abundance of nitrate-reducing bacteria like Azospira (0%), Denitratisoma (1.49%), and Dechloromonas (0.84%) was relatively low. These findings suggested that the ADTL reactor effectively repulses the nitrite loop associated with conventional internal circulation mode, leading to reduced aeration energy consumption during nitrification and decreased carbon source requirements during denitrification. Therefore, these results demonstrated the potential of the ADTL reactor to enhance the quality and efficiency of municipal wastewater treatment plants, providing valuable technical support for improving wastewater treatment.

Key words： double transverse internal loop numerical simulation gradient of dissolved oxygen simultaneous nitrification and denitrification nitrite loop

Received: 07 March 2024

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X703

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	Articles by authors
	LIU Ye-xing
	YU Li-fang
	CHEN Qian-yi
	DAI Bu-feng
	CAO Wan
	PENG Dang-cong

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LIU Ye-xing,YU Li-fang,CHEN Qian-yi等. Numerical simulation and nitrogen removal mechanism of a novel airlift dual transverse internal loop reactor[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5490-5498.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I10/5490

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