Process-based LCA of ultrafiltration for drinking water production

Area of Science:

• Environmental science and engineering
• Process engineering
• Water treatment technologies

Background:

• Decision-making tools are crucial for environmental mitigation and ecodesign in industrial processes.
• Membrane filtration is widely used but has significant environmental considerations.

Purpose of the Study:

• To develop a coupled model integrating membrane filtration process simulation and life cycle analysis (LCA).
• To evaluate environmental impacts of membrane filtration for drinking water production.
• To identify optimal operating strategies for mitigating environmental hotspots.

Main Methods:

• Developed a generic model coupling membrane filtration process simulation with LCA.
• Calculated material and energy flows under variable operating conditions.
• Applied the model to dead-end ultrafiltration of ground and surface water using cellulose triacetate hollow fibers.

Main Results:

• Identified electricity and backwash cleaning chemicals as major environmental hotspots.
• Demonstrated that adjusting filtration cycle duration and filtration flux can significantly mitigate environmental impacts.
• The model provides a quantitative basis for environmental impact assessment.

Conclusions:

• The developed integrated model offers a flexible and modular tool for environmental assessment of membrane processes.
• Optimizing operational parameters like filtration flux and cycle duration is key to reducing the environmental footprint of water treatment.
• The model can be adapted for various membrane materials, configurations, and applications.