Ad/Ar对曝气动力横向内循环反应器中混合液内循环比及脱氮性能影响研究

廖驰; 于莉芳; 曹皖; 蒋睿; 戴步峰; 彭党聪

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (11) : 6137-6145.

水污染与控制

A_d/A_r对曝气动力横向内循环反应器中混合液内循环比及脱氮性能影响研究

廖驰¹, 于莉芳¹, 曹皖², 蒋睿¹, 戴步峰², 彭党聪¹

作者信息 +

Effect of A_d/A_r on internal recycle ratioofmixed liquor and nitrogen removal performance in an airlift transverse internal loop reactor

LIAO Chi¹, YU Li-fang¹, CAO Wan², JIANG Rui¹, DAI Bu-feng², PENG Dang-cong¹

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摘要

采用一种新型曝气动力横向内循环反应器(ATIR)进行模拟城市污水生物脱氮研究,考察4种不同的下降区/上升区过流断面比值(A_d/A_r)对ATIR混合液内循环比与脱氮性能的影响.结果表明,ATIR利用曝气动能可以实现高内循环比(52~176).在A_d/A_r为1:1.5,HRT为9h时,出水总氮为(8.12 ± 1.21) mg/L.与常规内循环模式相比,ATIR在此A_d/A_r时曝气量降低了27.5%,亚硝酸盐氧化速率/氨氧化速率由1.31降至0.95,亚硝酸盐氧化菌(NOB)-Nitrospira丰度由3.66%降至0.88%.而且,此时ATIR同步硝化反硝化率达到(26.77 ± 2.36)%,短程硝化反硝化脱氮贡献率达16.71%.由此可见,ATIR在A_d/A_r为1:1.5时具有淘汰NOB潜力,且脱氮途径趋向于同步短程硝化反硝化.

Abstract

An airlift transverse internal loop reactor (ATIR) was operated for the treatment of synthetic municipalwastewater. The nitrogen removal performance and internal recycle ratio of the ATIR with four different ratios of the cross-sectional areas of the downcomer to the riser (A_d/A_r) were investigated. The results indicated that the ATIR achieved high internal recycle ratio (52~176) by utilizing aeration kinetic energy. The efficient nitrogen removal was obtained at an A_d/A_r of 1:1.5 and a hydraulic retention time (HRT) of 9h, with the effluent total nitrogen of (8.12 ± 1.21) mg/L. Compared to the conventional internal recycle mode, the ATIR at this A_d/A_r demonstrated a 27.5% reduction in aeration rate. Furthermore, the ratio of specific nitrite utilization rate to specific ammonia utilization rate decreased from 1.31 to 0.95 and the abundance of nitrite-oxidizing bacteria (NOB-Nitrospira) decreased from 3.66% to 0.88%. Meanwhile, the simultaneous nitrification-denitrification efficiency increased to 26.77%, and the contribution of partial nitrification and denitrification to nitrogen removal corresponding increased to 16.71%. These indicate that spontaneous nitrite-oxidizing bacteria washout in the ATIR had occurred and the nitrogen removal pathway at an A_d/A_r of 1.5 tends towards simultaneous partial nitrification and denitrification.

导出引用

廖驰, 于莉芳, 曹皖, 蒋睿, 戴步峰, 彭党聪. A_d/A_r对曝气动力横向内循环反应器中混合液内循环比及脱氮性能影响研究[J]. 中国环境科学. 2025, 45(11): 6137-6145

LIAO Chi, YU Li-fang, CAO Wan, JIANG Rui, DAI Bu-feng, PENG Dang-cong. Effect of A_d/A_r on internal recycle ratioofmixed liquor and nitrogen removal performance in an airlift transverse internal loop reactor[J]. China Environmental Science. 2025, 45(11): 6137-6145

中图分类号： X703

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