Model development and parameter estimation for a hybrid submerged membrane bioreactor treating Ametryn

Area of Science:

• Environmental Engineering
• Biotechnology
• Water Treatment

Background:

• Wastewater treatment often faces challenges with recalcitrant organic pollutants like Ametryn.
• Membrane bioreactors (MBRs) are effective but susceptible to fouling, impacting performance.
• Understanding microbial community dynamics and fouling mechanisms is crucial for optimizing MBRs.

Purpose of the Study:

• To evaluate the removal of Ametryn from synthetic wastewater using a lab-scale membrane bioreactor (MBR).
• To investigate the impact of Ametryn introduction on MBR operational parameters, including biomass characteristics and membrane fouling.
• To develop a mathematical model for simulating MBR performance during Ametryn treatment.

Main Methods:

• Operation of a lab-scale membrane bioreactor (MBR) with synthetic wastewater spiked with Ametryn.
• Monitoring of mixed liquor suspended solids (MLSS) and extracellular polymeric substances (EPS) concentrations.
• Analysis of membrane fouling rates, transmembrane pressure, and membrane resistance.
• Development and application of a mathematical model to estimate kinetic parameters.

Main Results:

• Ametryn introduction caused a 40-day transition period with fluctuating MLSS and EPS levels.
• Higher organic loading rates resulted in low net biomass yield and accelerated membrane fouling, particularly within the first 48 hours.
• Increased levels of bound EPS (eEPS) were identified as a key factor in membrane fouling.

Conclusions:

• Ametryn significantly alters MBR microbial dynamics and biomass characteristics.
• Enhanced membrane fouling is a critical issue during Ametryn treatment, linked to increased bound EPS.
• The developed mathematical model provides a valuable tool for predicting MBR performance, including flux, fouling, and treatment efficiency.