Optimal low-frequency mechanical vibration enhances extracellular polymeric substances-mediated phosphorus removal in...

Area of Science:

• Environmental Microbiology
• Biotechnology
• Water Treatment Engineering

Background:

• Biological phosphorus removal (BPR) is crucial for wastewater treatment.
• Limited mass transfer restricts BPR efficiency.
• Enhancing mass transfer is key to improving BPR performance.

Purpose of the Study:

• To investigate the impact of low-frequency mechanical vibration (LFMV) on BPR efficiency.
• To elucidate the mechanisms by which LFMV affects phosphorus removal.
• To provide a novel strategy for optimizing BPR systems.

Main Methods:

• Introduction of LFMV (40 Hz) into anaerobic/oxic reactors.
• Assessment of mass transfer coefficients and sludge characteristics.
• Analysis of phosphorus distribution, EPS composition, and microbial gene expression (16S rRNA).

Main Results:

• LFMV at 40 Hz improved BPR efficiency by ~13%.
• Enhanced mass transfer (>30%) due to altered sludge physicochemical properties.
• LFMV promoted EPS-mediated phosphorus adsorption, storage, and transformation, increasing polyphosphate content.

Conclusions:

• Optimal LFMV (40 Hz) effectively accelerates phosphorus removal.
• LFMV enhances BPR by improving EPS-mediated processes and phosphorus transformation.
• This study presents a promising technical strategy for BPR enhancement.