The metabolic strategy of phosphorus-accumulating organisms in response to low temperature in micro pressure swirl reactor

IF 7.4 2区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Environmental Chemical Engineering Pub Date : 2025-02-01 DOI:10.1016/j.jece.2024.115036

Xi Tian , Xue Yin , Xiaona Ji , Hongyan Li , Huanyun Duan , Kunyu Zhang , Dejun Bian

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Abstract

The impact of low temperature on the growth and metabolism of phosphorus-accumulating organisms (PAO) is crucial for maintaining the stability of organic removal efficiency. To investigate how lowering the temperature affects PAO's metabolic strategy, a micro pressure swirl reactor (MPSR) was operated at temperatures of 15, 12, and 10℃. The interactions and metabolic pathways of the microbial community in the system were examined. The results showed total phosphorus (TP) removal rate efficiencies were 97.0 %, 94.0 %, and 94.8 % in 15, 12 and 10℃, respectively. As the temperature decreased, glycogen consumption decreased by 27.44 mg/gMLSS, while poly-β-hydroxybutyrate (PHB) accumulation and consumption increased by 33.80 and 37.88 mg/gMLSS, respectively. Two essential genera of PAO, Rhodocyclus, and Dechloromonas increased from 0.70 % and 0.31–3.04 % and 2.79 % respectively. The metabolism of PAO changed as the temperature decreased. Glycolysis was inhibited at temperatures 12 and 10℃, and PAO applied an increase in phosphorus metabolism to meet the energy requirements for growth metabolism. This conversion in metabolic strategy helped PAO gain a competitive advantage and ensured that MPSR maintained good phosphorus organic matter removal at low temperatures.

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微压漩涡反应器中聚磷生物应对低温的代谢策略

低温对磷积累生物（PAO）生长和新陈代谢的影响对于保持有机物去除效率的稳定性至关重要。为了研究降低温度如何影响 PAO 的代谢策略，在 15、12 和 10℃的温度下运行了微压漩涡反应器（MPSR）。对系统中微生物群落的相互作用和代谢途径进行了研究。结果表明，总磷（TP）去除率在 15、12 和 10℃时分别为 97.0%、94.0% 和 94.8%。随着温度的降低，糖原消耗量减少了 27.44 mg/gMLSS，而聚-β-羟基丁酸（PHB）的积累量和消耗量则分别增加了 33.80 和 37.88 mg/gMLSS。PAO 的两个重要属 Rhodocyclus 和 Dechloromonas 分别从 0.70 % 和 0.31 % 增加到 3.04 % 和 2.79 %。PAO 的新陈代谢随着温度的降低而变化。在温度为 12 和 10℃时，糖酵解受到抑制，PAO 增加了磷代谢，以满足生长代谢对能量的需求。这种代谢策略的转变有助于 PAO 获得竞争优势，并确保 MPSR 在低温条件下保持良好的磷有机物去除率。

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来源期刊

Journal of Environmental Chemical Engineering Environmental Science-Pollution

CiteScore

11.40

自引率

6.50%

发文量

2017

审稿时长

27 days

期刊介绍： The Journal of Environmental Chemical Engineering (JECE) serves as a platform for the dissemination of original and innovative research focusing on the advancement of environmentally-friendly, sustainable technologies. JECE emphasizes the transition towards a carbon-neutral circular economy and a self-sufficient bio-based economy. Topics covered include soil, water, wastewater, and air decontamination; pollution monitoring, prevention, and control; advanced analytics, sensors, impact and risk assessment methodologies in environmental chemical engineering; resource recovery (water, nutrients, materials, energy); industrial ecology; valorization of waste streams; waste management (including e-waste); climate-water-energy-food nexus; novel materials for environmental, chemical, and energy applications; sustainability and environmental safety; water digitalization, water data science, and machine learning; process integration and intensification; recent developments in green chemistry for synthesis, catalysis, and energy; and original research on contaminants of emerging concern, persistent chemicals, and priority substances, including microplastics, nanoplastics, nanomaterials, micropollutants, antimicrobial resistance genes, and emerging pathogens (viruses, bacteria, parasites) of environmental significance.