氧浓度对调节NO x 氧化度协同CABR法脱硝性能及菌群结构的影响

doi:10.16085/j.issn.1000-6613.2022-0152

化工进展 ›› 2022, Vol. 41 ›› Issue (11): 6139-6148.DOI: 10.16085/j.issn.1000-6613.2022-0152

氧浓度对调节NO _x 氧化度协同CABR法脱硝性能及菌群结构的影响

杨景瑞¹(), 王莹², 陈虎³, 吕永康²()

^1.山西能源学院资源与环境工程系，山西太原 030000
^2.太原理工大学省部共建煤基能源清洁高效利用国家重点实验室，山西太原 030024
^3.太原理工大学环境科学与工程学院，山西太原 030024

收稿日期:2022-01-22 修回日期:2022-04-09 出版日期:2022-11-25 发布日期:2022-11-28
通讯作者: 吕永康
作者简介:杨景瑞（1992—），女，讲师，研究方向为大气污染物及污水治理。E-mail：yangjingrui0809@126.com。
基金资助:
国家自然科学基金(51778397);山西省高等学校科技创新项目(2020L0081)

Effects of O₂ concentration on adjusting NO _x oxidation ratio cooperated with CABR system denitration performance and microbial community structure

YANG Jingrui¹(), WANG Ying², CHEN Hu³, LYU Yongkang²()

^1.Department of Resources and Environmental Engineering, Shanxi Institute of Energy, Taiyuan 030000, Shanxi, China
^2.State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
^3.College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

Received:2022-01-22 Revised:2022-04-09 Online:2022-11-25 Published:2022-11-28
Contact: LYU Yongkang

摘要/Abstract

摘要：

针对调节NO _x 氧化度协同化学吸收-生物还原法在不同氧气体积分数下的NO _x 去除性能及微生物群落结构的动态变化，研究了氧气体积分数对该体系的影响机制。结果表明，调节模拟烟气中NO _x 氧化度为50%时，烟气中包含的氧气体积分数在0~8%的范围内，化学吸收-生物还原（CABR）体系的脱硝效率稳定在99%以上；当氧气体积分数达到10%时，系统脱硝效率仍可超过94%。EPS含量检测显示，氧体积分数从0增加至5%，导致LB-EPS中PN/PS值由1.72上升到2.18，TB-EPS中PN/PS值从1.21降至0.706。高通量测序结果表明，不同氧气体积分数下微生物的优势菌门均为Proteobacteria，其相对丰度达到55.0%~85.7%，它是典型的具有好氧反硝化能力的菌门，这保证了该系统脱硝性能的稳定。综上所述，氧体积分数对调节NO _x 氧化度协同CABR集成系统的脱硝效果影响较小，为烟气中NO _x 的去除提供了新的思路。

关键词: 氮氧化物, O₂体积分数, NO _x 氧化度, 化学吸收-生物还原, 微生物群落分析

Abstract:

Aiming at the NO _x removal efficiency and microbial community structure change of chemical absorption-biological reduction integrated system (CABR) cooperated with the adjusting NO _x oxidation ratio under different oxygen volume frations, the effect mechanism of oxygen on the CABR system was studied. Results showed that when the NO _x oxidation ratio in the simulated flue gas was adjusted to 50% and the oxygen volume fration in the flue gas was in the range of 0—8%, the NO _x removal efficiency of CABR system was stable above 99%. When the oxygen volume fration reached 10%, the denitration efficiency of the system could still exceed 94%. The detection of EPS content showed that when the oxygen volume fration increased from 0 to 5%, the PN/PS value in LB-EPS increased from 1.72 to 2.18, and the PN/PS value in TB-EPS decreased from 1.21 to 0.706. High-throughput sequencing results indicated that Proteobacteria was the dominant phylum under different oxygen volume frations, and its relative abundance reached 55.0%—85.7%. Proteobacteria was a typical phylum with aerobic denitrification capacity, which ensured the stability of denitration performance of the system. In conclusion, the oxygen volume fration had little influence on the denitration effect of the CABR method cooperated with adjusting NO _x oxidation ratio, which provided a new idea for the removal of NO _x in the flue gas.

Key words: nitrogen oxides, O₂volume fration, NO _x oxidation ratio, chemical absorption-biological reduction, microbial community analysis

中图分类号:

X511

杨景瑞, 王莹, 陈虎, 吕永康. 氧浓度对调节NO _x 氧化度协同CABR法脱硝性能及菌群结构的影响[J]. 化工进展, 2022, 41(11): 6139-6148.

YANG Jingrui, WANG Ying, CHEN Hu, LYU Yongkang. Effects of O₂ concentration on adjusting NO _x oxidation ratio cooperated with CABR system denitration performance and microbial community structure[J]. Chemical Industry and Engineering Progress, 2022, 41(11): 6139-6148.

图/表 8

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阶段	时间/d	水力停留时间 /h	氧体积分数 /%	气流量 /L·min^-1	入口硝氮浓度 /mg·L^-1	入口亚硝氮浓度 /mg·L^-1	入口NO浓度 /μL·L^-1	入口NO₂浓度 /μL·L^-1	NaHCO₃浓度 /mol·L^-1
Ⅰ	1~7	24	5	1	100	0	0	0	0
Ⅱ	8~9	24	5	1	100	0	0	0	0
Ⅲ	10~11	24	5	1	75	25	0	0	0
Ⅳ	12~13	24	5	1	50	50	0	0	0
Ⅴ	14~15	24	5	1	25	75	0	0	0
Ⅵ	16~17	24	5	1	0	100	0	0	0
Ⅶ	18~22	—	5	1	0	0	250	250	0.1

阶段	时间/d	水力停留时间 /h	氧体积分数 /%	气流量 /L·min^-1	入口硝氮浓度 /mg·L^-1	入口亚硝氮浓度 /mg·L^-1	入口NO浓度 /μL·L^-1	入口NO₂浓度 /μL·L^-1	NaHCO₃浓度 /mol·L^-1
Ⅰ	1~7	24	5	1	100	0	0	0	0
Ⅱ	8~9	24	5	1	100	0	0	0	0
Ⅲ	10~11	24	5	1	75	25	0	0	0
Ⅳ	12~13	24	5	1	50	50	0	0	0
Ⅴ	14~15	24	5	1	25	75	0	0	0
Ⅵ	16~17	24	5	1	0	100	0	0	0
Ⅶ	18~22	—	5	1	0	0	250	250	0.1

样本	Reads	OTU	Shannon	ACE	Chao1	Coverage	Simpson
S1	40385	244	2.43	615.86	595.05	1.00	0.16
S2	37765	227	2.02	975.77	705.12	1.00	0.23
S3	69407	271	2.31	1068.33	713.27	1.00	0.18
S4	82718	432	2.35	3172.34	1719.19	1.00	0.17
S5	120482	630	2.27	4035.95	2152.5	1.00	0.22

样本	Reads	OTU	Shannon	ACE	Chao1	Coverage	Simpson
S1	40385	244	2.43	615.86	595.05	1.00	0.16
S2	37765	227	2.02	975.77	705.12	1.00	0.23
S3	69407	271	2.31	1068.33	713.27	1.00	0.18
S4	82718	432	2.35	3172.34	1719.19	1.00	0.17
S5	120482	630	2.27	4035.95	2152.5	1.00	0.22

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氧浓度对调节NO _x 氧化度协同CABR法脱硝性能及菌群结构的影响

Effects of O₂ concentration on adjusting NO _x oxidation ratio cooperated with CABR system denitration performance and microbial community structure

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氧浓度对调节NO x 氧化度协同CABR法脱硝性能及菌群结构的影响

Effects of O2 concentration on adjusting NO x oxidation ratio cooperated with CABR system denitration performance and microbial community structure

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氧浓度对调节NO _x 氧化度协同CABR法脱硝性能及菌群结构的影响

Effects of O₂ concentration on adjusting NO _x oxidation ratio cooperated with CABR system denitration performance and microbial community structure