不同温度An/A/O-SBR反硝化除磷及N<sub>2</sub>O释放特性

任丽芳; 李晓庆; 孙洪伟

doi:10.13205/j.hjgc.202312013

不同温度An/A/O-SBR反硝化除磷及N₂O释放特性

doi: 10.13205/j.hjgc.202312013

1. 烟台职业学院建筑工程系, 山东烟台 264670;
2. 烟台市环境卫生管理中心, 山东烟台 264000;
3. 烟台大学环境与材料工程学院, 山东烟台 264005

基金项目:

烟职博士基金(2018002)

国家自然科学基金项目(51668031)

详细信息

作者简介:
任丽芳(1977-),女,硕士,副教授,主要研究方向为生活污水新型生物脱氮除磷技术应用。260943813@qq.com

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出版历程
- 收稿日期: 2022-09-02
- 网络出版日期: 2024-03-08

CHARACTERISTICS OF DENITRIFICATION PHOSPHORUS REMOVAL AND N₂O EMISSION IN AN/A/O-SBR UNDER DIFFERENT TEMPERATURES

1. Department of Architecture Engineering, Yantai Vocational College, Yantai 264670, China;
2. Yantai Vocational College of Culture Tourism, Yantai 264000, China;
3. School of Environmental and Material Engineering, Yantai University, Yantai 264005, China

摘要

摘要: 在不同温度(T=32,27,22,17,12 ℃)下驯化厌氧-缺氧-好氧序批式生物反应器(An/A/O-SBR),考察各温度条件下系统同步脱氮除磷性能及N₂O释放量,基于聚磷菌(PAOs)、聚糖菌(GAOs)降解特征和内源物质变化分析,确定了不同温度条件下系统PAOs和GAOs间竞争和N₂O释放特性。结果表明:随温度降低,An/A/O-SBR反硝化除磷性能呈先提升后降低的趋势。T=22 ℃,缺氧阶段NO^-_x和TP去除率最高,分别达95.5%和90.3%,N₂O产率为3.71%。低温促进了PAOs竞争优势,温度由32 ℃降至12 ℃,厌氧阶段合成的PHA中PHB占比(ΔPHB/ΔPHA)、缺氧阶段消耗PHA(PHA_con)中PHB(HB_con)占比(PHB_con/PHA_con)、缺氧阶段合成糖原(Gly_in)占PHA消耗比例(Gly_in/PHA_con)均逐渐接近于PAOs降解特性。温度升高促进了GAOs增殖,其反硝化过程不进行磷过量吸收,缺氧阶段TP去除率降低;低温条件下酶促反应速率下降,PHA提供电子速率降低,导致缺氧阶段NO₃^-去除率下降和N₂O产率增加。
- 温度 /
- 反硝化聚磷菌 /
- 聚糖菌 /
- 反硝化除磷 /
- 氧化亚氮
Abstract: Using an anaerobic/anoxic/aerobic sequencing batch reactor (An/A/O-SBR), the long-term impact of temperature (T=32, 27, 22, 17,12 ℃) on denitrification phosphorus removal performance and N₂O emission characteristics was investigated with five stages. The characteristics of anoxic nitrogen and phosphorus removal, as well as N₂O release in the system under different temperature conditions were investigated. Based on the analysis of the degradation characteristics of microbial flora, the competitive characteristics between the phosphorus accumulating bacteria (PAOs) and the glycogen accumulating bacteria (GAOs) were determined under different temperatures as well. The results showed that the denitrification and phosphorus removal performance of An/A/O-SBR increased first and then decreased with the temperature decreasing. The NO_x^- and TP removal efficiencies reached 95.5% and 90.3%, respectively, and the N₂O yield decreased to 3.71% at 22 ℃. To some extent, the low temperature promoted the competitive advantage of PAOs. The proportion of PHB in the synthetic PHA during the anaerobic stage (ΔPHB/ΔPHA), the proportion of PHB consumed in PHA (PHB_con/PHA_con), the proportion of glycogen synthesized in PHA consumed during the anoxic (Gly_in/PHA_con) were gradually close to the degradation characteristics of PAOs. The denitrification process of GAOs does not absorb excessive phosphorus, resulting in the reduction of TP removal efficiency. Under lower temperatures, both the enzymatic reaction rate and the electron providing rate by PHA decreased, which led to the decrease of NO₃^- removal rate and the increase of N₂O yield in the anoxic stage. Higher temperatures promoted the proliferation of GAOs in the An/A/O-SBR system.
- temperature /
- denitrifying phosphorus accumulating organisms /
- glycogen accumulating organisms /
- denitrifying phosphorus removal process /
- N₂O

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