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Insight into the mechanism of nutrients removal and response regulation of denitrifying phosphorus removal system under calcium ion stress

Bioresource Technology, ISSN: 0960-8524, Vol: 388, Page: 129747
2023
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Article Description

The influent quality is an important factor affecting the nutrients removal and operational stability of denitrifying phosphorus removal (DPR) system. This study investigated the effects of calcium ion (Ca 2+ ) on the nutrients removal, nitrogen oxide (N 2 O) release, microbial community, and quorum sensing in DPR system. Results showed that high accumulation of Ca 2+ had a significant impact on the carbon footprint of DPR system. Specifically, N 2 O release reached 2.11 mg/L under Ca 2+ of 150 mg/L, which represented 214.93% increase compared to 0 mg/L of Ca 2+. The DPR system demonstrated its adaptability to elevated Ca 2+ concentrations by modifying key enzyme activities involved in nitrogen and phosphorus removal, altering the microbial community structure, and adjusting the type and content of signal molecules. These findings hold significant implications for understanding the stress mechanism of Ca 2+ on DPR system, ultimately aiding in the maintenance and enhancement of stable operational performance in biological wastewater treatment process.

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