Chemical-Saving Potential for Membrane Bioreactor (MBR) Processes Based on Long-Term Pilot Trials

Area of Science:

• Environmental Science
• Chemical Engineering
• Water Treatment Technologies

Background:

• Membrane bioreactors (MBRs) are crucial for municipal wastewater treatment, meeting stringent water quality standards and enabling water reuse.
• High chemical consumption for membrane cleaning challenges the operational sustainability and cost-effectiveness of MBR processes.

Purpose of the Study:

• To investigate innovative membrane-cleaning strategies to improve the sustainability of MBR processes.
• To assess the impact of alternative cleaning methods on chemical usage, treatment performance, operational costs, and environmental footprint.

Main Methods:

• Long-term pilot trials were conducted at a large-scale municipal wastewater treatment plant in Stockholm.
• Alternative membrane-cleaning strategies were implemented and compared to conventional methods.

Main Results:

• Alternative cleaning strategies reduced chemical usage by up to 75% without affecting treatment performance.
• Significant cost reductions of up to 70% were observed.
• Environmental impacts were reduced by as much as 95% for specific indicators.

Conclusions:

• The study demonstrates that innovative membrane-cleaning strategies enhance MBR sustainability by reducing resource consumption and costs.
• These findings support the wider adoption of MBRs and offer pathways for optimizing existing installations.
• The research provides practical solutions for lowering operational expenses and environmental impact in wastewater treatment.