CHARACTERISTICS OF DENITRIFICATION PHOSPHORUS REMOVAL AND N<sub>2</sub>O EMISSION IN AN/A/O-SBR UNDER DIFFERENT TEMPERATURES

REN Lifang; LI Xiaoqing; SUN Hongwei

doi:10.13205/j.hjgc.202312013

Volume 41 Issue 12

Dec. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(12): 107-115

REN Lifang, LI Xiaoqing, SUN Hongwei. CHARACTERISTICS OF DENITRIFICATION PHOSPHORUS REMOVAL AND N2O EMISSION IN AN/A/O-SBR UNDER DIFFERENT TEMPERATURES[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 107-115. doi: 10.13205/j.hjgc.202312013

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REN Lifang, LI Xiaoqing, SUN Hongwei. CHARACTERISTICS OF DENITRIFICATION PHOSPHORUS REMOVAL AND N₂O EMISSION IN AN/A/O-SBR UNDER DIFFERENT TEMPERATURES[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(12): 107-115. doi: 10.13205/j.hjgc.202312013

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

doi: 10.13205/j.hjgc.202312013

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

Received Date: 2022-09-02
Available Online: 2024-03-08

Abstract

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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References(35)

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