Study on Permeability Stability of Sand-Based Microporous Ceramic Filter Membrane
Wei Zhou1, Lin Zhang2,3, Pute Wu4,5,6
1Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Xianyang 712100, China.
Materials (Basel, Switzerland)
|July 10, 2019
Summary
This study addresses diafiltration instability in ceramic membranes by analyzing how material properties affect water flow. Findings reveal porosity and pore wall roughness influence permeate flux stability over time.
Area of Science:
- Materials Science
- Chemical Engineering
- Filtration Technology
Background:
- Microporous ceramic membranes are crucial for filtration but suffer from diafiltration instability.
- This instability hinders practical applications and requires solutions for stable permeate flux.
Purpose of the Study:
- To investigate the factors affecting permeate flux stability in ceramic membranes.
- To develop a semi-empirical formula for effective permeability radius over time.
- To propose methods for improving permeate flux.
Main Methods:
- Preparation of ceramic membranes using sand as matrix materials.
- Analysis of water flow response and material properties.
- Establishment of a semi-empirical formula for effective permeability radius.
- Theoretical analysis to propose flux improvement measures.
Main Results:
- Permeate flux showed significant changes initially, stabilizing over time.
- Changes in open and closed porosity affected the seepage area and flux stability.
- Inner wall roughness influenced hydraulic loss and outflow.
- Trace elements formed a glass phase, increasing viscous resistance and affecting flux over time.
Conclusions:
- Porosity, pore wall roughness, and trace element-induced glass phase are key factors in ceramic membrane diafiltration instability.
- The developed semi-empirical formula provides insights into flux behavior.
- Proposed measures can enhance permeate flux stability and efficiency.
More Related Videos
09:25Implementation of a Permeable Membrane Insert-based Infection System to Study the Effects of Secreted Bacterial Toxins on Mammalian Host Cells
Published on: August 19, 2016
11.4K
06:53Additive Manufacturing of Functionally Graded Ceramic Materials by Stereolithography
Published on: January 25, 2019
15.1K
Related Concept Videos
01:20Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry
513
Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
513
01:27Passive Filters
964
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
964
01:25Active Filters
1.3K
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
1.3K
03:18Nuclear Stability
23.0K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
To hold positively charged protons together...
23.0K
01:53RNA Stability
35.6K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.6K
01:25Permeability of Concrete
472
Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
472