Wastewater treatment using a modified A2O process based on fiber polypropylene media

Area of Science:

• Environmental Science
• Water Treatment Engineering
• Microbiology

Background:

• Municipal wastewater treatment requires efficient removal of organic matter and nutrients.
• Conventional Anaerobic/Anoxic/Oxic (A2O) processes can be enhanced for improved performance.
• Biofilm reactors are effective but often complex and costly.

Purpose of the Study:

• To evaluate a modified A2O process using fiber polypropylene media for enhanced wastewater treatment.
• To determine the impact of operational conditions on the removal of organics and nutrients.
• To assess the cost-effectiveness compared to existing advanced systems.

Main Methods:

• A laboratory-scale A2O process was modified with fiber polypropylene media.
• Experiments were conducted under varying operational conditions, including organic loading rate (OLR) and hydraulic retention time (HRT).
• Removal efficiencies for chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) were measured.

Main Results:

• The modified A2O system achieved high removal rates: 91%-98% for COD, 48%-63% for TN, and 56%-71% for TP.
• Significant COD reduction (55%-68%) was observed even in the anaerobic stage.
• Removal efficiencies slightly decreased with higher OLR or shorter HRT, potentially due to bacterial competition or insufficient uptake time.

Conclusions:

• Fiber polypropylene media significantly enhances the efficacy of A2O processes for removing organics and nutrients.
• This modified A2O system offers a cost-effective strategy for advanced wastewater treatment.
• The findings suggest a promising approach for improving municipal wastewater quality.