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Self-Regulating pH Pyrite-Construction waste Biofilter: Denitrification Performance, Metabolic Pathways, and Clogging
Yinzhou Bao1, Suhao Feng1, Fan Yu1
1College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
Bioresource Technology
|April 9, 2025
Summary
This study introduces a novel construction waste and pyrite filter for efficient wastewater denitrification, overcoming common issues like clogging and low efficiency. The innovative filter demonstrates high nitrogen removal and self-regulating pH, offering an eco-friendly solution.
Area of Science:
- Environmental Engineering
- Environmental Microbiology
- Materials Science
Background:
- Conventional denitrification filters struggle with alkalinity buildup, reduced efficiency, and clogging.
- Construction waste and pyrite offer potential as sustainable filter materials.
Purpose of the Study:
- To develop and evaluate a novel denitrification filter using construction waste and pyrite (WPDF).
- To assess WPDF's performance, safety, and underlying mechanisms for wastewater treatment.
- To investigate WPDF's impact on biofilm formation, clogging, and nutrient removal.
Main Methods:
- Performance evaluation through effluent measurement.
- Analysis of filler characteristics and biofilm accumulation.
- Metagenomic analysis to understand microbial community and metabolic pathways.
Main Results:
- Achieved a high total nitrogen removal load of 88.65 g N m⁻³d⁻¹.
- Minimized biofilm (13%) and filler accumulation (39%), effectively preventing clogging.
- Demonstrated pH self-regulation and enhanced fulvic acid production.
- Pyrite addition boosted bio-metabolism, enriching energy and transporter capacities.
- Metagenomics revealed increased genes for denitrification, glycolysis, and electron transport.
Conclusions:
- WPDF presents a novel, efficient, and eco-friendly solution for wastewater denitrification.
- The filter effectively mitigates common operational challenges like clogging and alkalinity accumulation.
- Study provides molecular insights into carbon and nitrogen metabolism in WPDF systems.
