Related Experiment Video
Updated: Dec 12, 2025
09:39
Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination
Published on: March 1, 2020
7.8K
Process water recovery via forward osmosis: membrane and integrated process development.
J Martin1, G Kolliopoulos1, V G Papangelakis1
1University of Toronto, 200 College St., Toronto, ON M5S 3H7, Canada
Summary
This study developed a continuous forward osmosis system for wastewater recycling, optimizing energy use. The trimethylamine-carbon dioxide draw solution regeneration is most energy-efficient when its flow rate is carefully managed.
Area of Science:
- Environmental Science
- Chemical Engineering
- Water Treatment Technologies
Background:
- Wastewater reclamation is crucial for sustainable water management.
- Forward osmosis (FO) offers a promising low-energy water treatment method.
- Optimizing FO systems for energy efficiency is essential for practical application.
Purpose of the Study:
- To develop an integrated continuous forward osmosis system for wastewater recovery.
- To identify critical process parameters for minimizing energy consumption.
- To evaluate the performance of different draw solutions and hydrodynamic conditions.
Main Methods:
- Forward osmosis experiments with varying NaCl concentrations.
- Determination of intrinsic membrane parameters using nonlinear regression in MATLAB.
- Validation of a theoretical water flux model.
- Simulation of FO performance with NaCl and TMA-CO2-H2O draw solutions under different hydrodynamic conditions.
Main Results:
- Intrinsic membrane parameters were determined.
- A theoretical water flux model was validated.
- The TMA-CO2 draw solution regeneration stage's energy efficiency was analyzed.
- Draw solution flow rate significantly impacts energy consumption during regeneration.
- Increased feed flow rate slightly enhanced water flux but had negligible impact on regeneration energy.
Conclusions:
- The developed integrated continuous forward osmosis system shows potential for wastewater recovery.
- Draw solution flow rate is a critical parameter for optimizing energy consumption in the regeneration stage.
- Further optimization of hydrodynamic conditions can improve water flux and energy efficiency.
Related Concept Videos
02:40Osmosis and Osmotic Pressure of Solutions
45.2K
A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
45.2K
01:30Osmosis
10.1K
Osmosis is the movement of free water molecules through a semipermeable membrane. The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
Water, like other substances, moves from a high concentration of...
Water, like other substances, moves from a high concentration of...
10.1K
01:15Dialysis
1.4K
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
1.4K