Tertiary nitrification in a new dual-medium aerated filter

Area of Science:

• Environmental Engineering
• Water Treatment Technologies
• Microbial Ecology

Background:

• Tertiary sewage treatment is crucial for removing residual pollutants.
• Nitrification is a key process in wastewater treatment, converting ammonia to nitrate.
• Developing efficient aerated filters is essential for advanced wastewater management.

Purpose of the Study:

• To develop and evaluate a novel dual-medium aerated filter for enhanced nitrification.
• To assess the nitrification performance of the new filter under various operational conditions.
• To compare the efficacy of the new filter against conventional filters for tertiary sewage treatment.

Main Methods:

• Formulation of a two-layer filter: upper plastic medium, lower anthracite.
• Pilot-scale and small-scale apparatus testing with secondary-treated and artificial sewage.
• Evaluation of nitrification characteristics by varying water velocity, air velocity, temperature, and pH.
• Design of a tertiary treatment plant for comparative analysis.

Main Results:

• The dual-medium aerated filter exhibited high nitrification capabilities.
• Performance was evaluated across a range of water and air velocities, temperatures, and pH levels.
• The new filter was found to be effective in tertiary sewage treatment.

Conclusions:

• The developed dual-medium aerated filter is a highly effective device for tertiary sewage treatment.
• The filter's design offers significant advantages in nitrification efficiency.
• This technology presents a promising solution for advanced wastewater treatment plants.