Analysis of clogging behaviors of diatomaceous ceramic membranes during membrane filtration based upon specific deposit

AIChE Journal ◽  
2009 ◽  
Vol 56 (7) ◽  
pp. 1748-1758 ◽  
Author(s):  
Eiji Iritani ◽  
Nobuyuki Katagiri ◽  
Tomoaki Tadama ◽  
Hiroaki Sumi
Keyword(s):  
Membrane Filtration ◽  
Ceramic Membranes ◽  
Specific Deposit

scholarly journals Chemical and microstructural analyses for heavy metals removal from water media by ceramic membrane filtration

2016 ◽  
Vol 75 (2) ◽  
pp. 439-450 ◽  
Author(s):  
Asmaa Ali ◽  
Abdelkader Ahmed ◽  
Ali Gad
Keyword(s):  
Heavy Metals ◽  
Chemical Analysis ◽  
Membrane Filtration ◽  
Ceramic Membrane ◽  
Low Cost ◽  
Ceramic Membranes ◽  
Filtration Process ◽  
X Ray ◽  
Before And After ◽  
Water Media

This study aims to investigate the ability of low cost ceramic membrane filtration in removing three common heavy metals namely; Pb2+, Cu2+, and Cd2+ from water media. The work includes manufacturing ceramic membranes with dimensions of 15 by 15 cm and 2 cm thickness. The membranes were made from low cost materials of local clay mixed with different sawdust percentages of 0.5%, 2.0%, and 5.0%. The used clay was characterized by X-ray diffraction (XRD) and X-ray fluorescence analysis. Aqueous solutions of heavy metals were prepared in the laboratory and filtered through the ceramic membranes. The influence of the main parameters such as pH, initial driving pressure head, and concentration of heavy metals on their removal efficiency by ceramic membranes was investigated. Water samples were collected before and after the filtration process and their heavy metal concentrations were determined by chemical analysis. Moreover, a microstructural analysis using scanning electronic microscope (SEM) was performed on ceramic membranes before and after the filtration process. The chemical analysis results showed high removal efficiency up to 99% for the concerned heavy metals. SEM images approved these results by showing adsorbed metal ions on sides of the internal pores of the ceramic membranes.

Ceramic membranes for direct river water treatment applying coagulation and microfiltration

2006 ◽  
Vol 6 (4) ◽  
pp. 89-98 ◽  
Author(s):  
A. Loi-Brügger ◽  
S. Panglisch ◽  
P. Buchta ◽  
K. Hattori ◽  
H. Yonekawa ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Pilot Study ◽  
River Water ◽  
Membrane Filtration ◽  
Ceramic Membrane ◽  
Drinking Water Treatment ◽  
Ceramic Membranes ◽  
Operating Conditions ◽  
Optimum Operating

A new ceramic membrane has been designed by NGK Insulators Ltd., Japan, to compete in the drinking water treatment market. The IWW Water Centre, Germany, investigated the operational performance and economical feasibility of this ceramic membrane in a one year pilot study of direct river water treatment with the hybrid process of coagulation and microfiltration. The aim of this study was to investigate flux, recovery, and DOC retention performance and to determine optimum operating conditions of NGK's ceramic membrane filtration system with special regards to economical aspects. Temporarily, the performance of the ceramic membrane was challenged under adverse conditions. During pilot plant operation river water with turbidities between 3 and 100 FNU was treated. Membrane flux was increased stepwise from 80–300 l/m2h resulting in recoveries between 95.9 and 98.9%. A DOC removal between about 20–35% was achieved. The pilot study and the subsequent economical evaluation showed the potential to provide a reliable and cost competitive process option for water treatment. The robustness of the ceramic membrane filtration process makes it attractive for a broad range of water treatment applications and, due to low maintenance requirements, also suitable for drinking water treatment in developing countries.

Behavior of micro-particles in monolith ceramic membrane filtration with pre-coagulation

2004 ◽  
Vol 50 (12) ◽  
pp. 317-325 ◽  
Author(s):  
H. Yonekawa ◽  
Y. Tomita ◽  
Y. Watanabe
Keyword(s):  
Membrane Filtration ◽  
Ceramic Membrane ◽  
Membrane Surface ◽  
Flow Analysis ◽  
Ceramic Membranes ◽  
End Point ◽  
Micro Particles ◽  
Dead End ◽  
Cake Layer ◽  
The Dead

This paper is intended to clarify the characteristics unique to monolith ceramic membranes with pre-coagulation by referring to the behavior of micro-particles. Flow analysis and experiments have proved that monolith ceramic membranes show a unique flow pattern in the channels within the element, causing extremely rapid flocculation in the channel during dead-end filtration. It was assumed that charge-neutralized micro-particles concentrated near the membrane surface grow in size due to flocculation, and as a result, coarse micro-particles were taken up by the shearing force to flow out. As the dead end points of flow in all the channels are located near the end of the channels with higher filterability, most of the flocculated coarse particles are formed to a columnar cake intensively at the dead end point. Therefore cake layer forming on the membrane other than around the dead end point is alleviated. This behavior of particle flocculation and cake formation at the dead end point within the channels are unique characteristics of monolith ceramic membranes. This is why all monolith ceramic membrane water purification systems operating in Japan do not have pretreatment equipment for flocculation and sedimentation.

Kraft lignin as feedstock for chemical products: The effects of membrane filtration

Holzforschung ◽  
2009 ◽  
Vol 63 (3) ◽  
Author(s):  
Ida Brodin ◽  
Elisabeth Sjöholm ◽  
Göran Gellerstedt
Keyword(s):  
Molecular Mass ◽  
Carbon Fibers ◽  
Membrane Filtration ◽  
Molecular Mass Distribution ◽  
Ceramic Membranes ◽  
Kraft Pulping ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Chemical Products ◽  
Technical Lignins

Abstract The use of technical lignins as feedstock for chemical products will require improvements in purity, molecular mass distribution, and thermal behavior. Therefore, industrial black liquors from kraft pulping of softwood (spruce/pine) and hardwood (birch and Eucalyptus globulus) have been subjected to fractionation according to molecular mass by ceramic membranes. After acidification and isolation of the lignin fractions, a variety of analytical methods have been applied to help understand their structure – property relationships. From all types of lignin, the chemical and polymeric properties of fractions isolated from the membrane permeates were more homogeneous. This demonstrates that technical kraft lignins, irrespective of origin, may constitute an interesting feedstock for products, such as carbon fibers, adhesives, and phenol-based polymers.

scholarly journals The Use of Flat Ceramic Membranes for Purification of the Liquid Fraction of the Digestate from Municipal Waste Biogas Plants

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3947
Author(s):  
Agnieszka Urbanowska ◽  
Małgorzata Kabsch-Korbutowicz
Keyword(s):  
Membrane Fouling ◽  
Membrane Filtration ◽  
Liquid Fraction ◽  
Ceramic Membranes ◽  
Municipal Waste ◽  
Recycled Water ◽  
Sedimentation Process ◽  
Biogas Plants ◽  
Plant Membranes

Due to the rising water deficit in agriculture, digestate is increasingly being considered not only as an alternative fertiliser but also as a potential source of water. The use of recycled water for crop irrigation requires that it be treated in such a way that contaminants from the fermented biomass are not returned to the environment. Membrane processes can provide promising results in this regard. This study seeks to achieve membrane filtration using flat ceramic membranes for effective digestate liquid fraction treatment from a municipal waste biogas plant. Membranes of 1, 5, 15, and 50 kDa, and 0.14 and 0.45 µm are examined. The results obtained show that the application of a sedimentation process, as a preliminary step in the purification of the digestate, allows for a significant reduction in the content of contaminants in the solution. By analysing the effectiveness of the liquid fraction of the digestate purification in the sedimentation-membrane filtration process using flat ceramic membranes, it can be stated that all the membranes tested can be applied in the digestate purification. With an increase in the cut-off value, a deterioration in the quality of the digestate can be observed. The use of the sedimentation process before the membrane process not only improves the final quality of the digestate but also reduces the intensity of membrane fouling.

scholarly journals Enhanced Degradation of Sulfamethoxazole (SMX) in Toilet Wastewater by Photo-Fenton Reactive Membrane Filtration

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 180
Author(s):  
Shaobin Sun ◽  
Hong Yao ◽  
Xinyang Li ◽  
Shihai Deng ◽  
Shenlong Zhao ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Membrane Filtration ◽  
Natural Waters ◽  
Ceramic Membrane ◽  
Removal Rate ◽  
Ceramic Membranes ◽  
Feed Solution ◽  
Apparent Quantum Yield ◽  
Fenton Catalyst ◽  
Reactive Membrane

Pharmaceutical residuals are increasingly detected in natural waters, which made great threat to the health of the public. This study evaluated the utility of the photo-Fenton ceramic membrane filtration toward the removal and degradation of sulfamethoxazole (SMX) as a model recalcitrant micropollutant. The photo-Fenton catalyst Goethite (α-FeOOH) was coated on planar ceramic membranes as we reported previously. The removal of SMX in both simulated and real toilet wastewater were assessed by filtering the feed solutions with/without H2O2 and UV irradiation. The SMX degradation rate reached 87% and 92% respectively in the presence of UV/H2O2 for the original toilet wastewater (0.8 ± 0.05 ppb) and toilet wastewater with a spiked SMX concentration of 100 ppb. The mineralization and degradation by-products were both assessed under different degradation conditions to achieve deeper insight into the degradation mechanisms during this photo-Fenton reactive membrane filtration. Results showed that a negligible removal rate (e.g., 3%) of SMX was obtained when only filtering the feed solution through uncoated or catalyst-coated membranes. However, the removal rates of SMX were significantly increased to 67% (no H2O2) and 90% (with H2O2) under UV irradiation, respectively, confirming that photo-Fenton reactions played the key role in the degradation/mineralization process. The highest apparent quantum yield (AQY) reached up to approximately 27% when the H2O2 was 10 mmol·L−1 and UV254 intensity was 100 μW·cm−2. This study lays the groundwork for reactive membrane filtration to tackle the issues from micropollution.

Kinetic analysis of PAC cake-layer formation in hybrid PAC-MF systems

2008 ◽  
Vol 8 (1) ◽  
pp. 1-7 ◽  
Author(s):  
S. Takizawa ◽  
P. Zhao ◽  
S. Ohgaki ◽  
H. Katayama
Keyword(s):  
Membrane Filtration ◽  
Specific Resistance ◽  
Experimental Studies ◽  
Ceramic Membranes ◽  
Layer Formation ◽  
Void Space ◽  
Filtration Resistance ◽  
Saw Dust ◽  
Cake Layer ◽  
The Difference

Experimental studies were conducted to evaluate the effectiveness of backwashing and air-scouring to prevent cake-layer formation on the membranes in a hybrid PAC-MF process. The membrane filtration chamber used in this study was separated into two zones; namely, the PAC adsorption zone (PAZ) and the membrane filtration zone (MFZ). In MFZ tubular ceramic membranes were installed, and powdered activated carbon (PAC) was suspended in PAZ at a concentration of 20 g/L by aeration. Air-scouring and backwashing rates were gradually increased to see if these physical cleaning measures can reduce or maintain the filtration resistance due to formation of PAC cake layer on the membrane. Two types of saw-dust PAC having different sizes were used to find the difference of the effects of air-scouring and backwashing. A smaller PAC (Shirasagi C1, Japan EnviroChemicals, Co.) showed a slower increasing rate of filtration resistance than the larger PAC (Shirasagi S-10, Japan EnviroChemicals, Co.). It was found that air-scouring didn't reduce the rate of cake fouling formation of PAC S-10, but can quite effectively reduce the rate of PAC C-1 attachment to the membrane. On the contrary, backwashing was not effective for PAC C-1, but quite effective for PAC S-10. PAC C1 formed a porous cake with low specific resistance, which can be easily removed by air-scouring, but cannot be removed by backwashing. On the other hand, PAC S-10 formed a tight cake layer because suspended particles get in to the void space between the PAC S-10. A dynamic model was proposed to explain the effect of air-scouring and backwashing to removal cake layer from the membranes.

Ozone enhanced ceramic membrane filtration for wastewater recycling

2019 ◽  
Vol 14 (2) ◽  
pp. 331-340
Author(s):  
P. Spencer ◽  
S. Domingos ◽  
B. Edwards ◽  
D. Howes ◽  
H. Shorney-Darby ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Pilot Plant ◽  
Membrane Filtration ◽  
Ceramic Membrane ◽  
Treatment Plant ◽  
Ceramic Membranes ◽  
Treated Wastewater ◽  
Wastewater Recycling ◽  
Pre Treatment ◽  
Uf Membranes

Abstract The Water Corporation of Western Australia uses polymeric ultrafiltration (UF) membranes across a range of applications including surface waters with high natural organic matter (NOM), recycling of secondary treated wastewater and pre-treatment for seawater reverse osmosis (SWRO). These challenging raw water conditions require expensive chemical dosing and clean-in-place (CIP) regimes, high frequency of membrane replacement and reduced membrane life. The greater durability of ceramic membranes, with optimal ozone and coagulant dosing, offer a potential capital and operating advantage over polymeric UF membranes. The Water Corporation collaborated with PWN Technologies (PWNT) to establish a ceramic membrane pilot plant at the Beenyup Wastewater Treatment Plant (WWTP). Optimised performance of the pilot plant was established and compared with existing UF membranes treating secondary treated wastewater prior to reverse osmosis (RO) in an indirect potable wastewater recycling application. Findings show a sustainable flux rate of 150 L/m2/h is achievable with ceramic MF membranes while filtering secondary treated wastewater. Higher flux rates up to 250 L/m2/h have been tested and are possibly sustainable, however, other bottlenecks in the pilot plant (ozone generator capacity) prevented longer test runs at this flux. Comparable design flux rates for polymeric UF membranes are 50 L/m2/h.

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