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Related Experiment Video

Updated: Jun 6, 2025

Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination

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Purification of harvested rainwater using gravity-driven ceramic membrane: A visualization study combining Micro-CT

Mingfei Yang¹, Yaohui Cai², Juan Yu¹

¹College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China; Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi, 712100, China.

Journal of Environmental Management

|December 2, 2024

Summary

Biofilms significantly reduce water flow through gravity-driven ceramic membranes (GDCMs) by altering surface pores. Uniform pore structures in GDCMs are more effective at maintaining water flux when biofilms are present.

Keywords:

Biofilm COMSOL simulation GDCM Micro-CT RWH Seepage visualization

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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

Published on: April 7, 2017

Area of Science:

Water purification
Membrane science
Environmental engineering

Background:

Rainwater harvesting offers a solution for water-scarce regions, but harvested water requires purification.
Gravity-driven ceramic membranes (GDCMs) are energy-efficient for purifying rainwater.
The impact of biofilms on GDCM performance is not well understood.

Purpose of the Study:

To investigate the fouling mechanisms of biofilms on GDCMs.
To understand how biofilms affect the pore and seepage properties of GDCMs.
To identify optimal GDCM pore structures for maintaining flux under fouling conditions.

Main Methods:

Integrated indoor seepage experiments with microcomputed tomography (micro-CT).
Utilized COMSOL simulations to model biofilm impact.
Analyzed changes in surface pore structure and seepage flux.

Main Results:

Biofilm growth altered GDCM surface pore structure, increasing small pore sizes.
Surface pore constriction led to a rapid reduction in seepage flux.
Simulations showed high-pressure regions and obstructed flow paths due to biofilm attachment.

Conclusions:

Biofilms primarily impact the surface pores of GDCMs, not internal ones.
Uniform GDCM pore throat channels are more effective than complex ones for maintaining flux.
Understanding biofilm fouling is crucial for optimizing rainwater purification systems.