Treatment Performance of Photocatalysis/H2O2/Metal Membrane Process for Organics Removal

2008 ◽  
Vol 569 ◽  
pp. 5-8 ◽  
Author(s):  
Jong Tae Jung ◽  
Jong Oh Kim ◽  
Won Youl Choi
Keyword(s):  
Hydrogen Peroxide ◽  
Humic Acid ◽  
Pore Size ◽  
Removal Efficiency ◽  
Membrane Surface ◽  
Membrane System ◽  
Oh Radicals ◽  
Metal Membrane ◽  
Tio2 Particles ◽  
Organics Removal

The objective of this study is to evaluate the performance of photocatalysis/hydrogen peroxide/metal membrane system. Metal membrane for the separation of TiO2 particles was used in an experiment and nominal pore size is 0.5 μm. Hydrogen peroxide was tested as oxidants. The removal efficiency of CODCr and color for initial hydrogen peroxide concentration increases rapidly with an increase in the hydrogen peroxide concentration up to 50 mg/L. The removal efficiency of of CODCr and color for 50 mg/L of initial hydrogen peroxide concentration was about 95 % and 98 %, respectively. However, the addition of hydrogen peroxide over 50 mg/L inhibits the system efficiency. The addition of hydrogen peroxide in UV/TiO2 system enhanced removal efficiency of CODCr and color compared to no addition of hydrogen peroxide. This may be ascribed to capture the electrons ejected from TiO2 and to produce OH radicals. The application of metal membrane in UV/ TiO2/H2O2 system enhanced removal efficiency of CODCr and color due to the adsorption of metal membrane surface as well as the production of OH radical. In application of metal membrane with nominal pore size 0.5 μm, TiO2 particles were effectively separated from the treated water by metal membrane rejection. Photocatalytic metal membrane was much smaller resistance than these of humic acid, TiO2 and humic acid/ TiO2 due to humic acid degradation of photocatalytic reaction.

Application of Photocatalytic Metal Membrane System for Water Purification

2006 ◽  
Vol 326-328 ◽  
pp. 1317-1320 ◽  
Author(s):  
Jong Oh Kim ◽  
Jong Tae Jung ◽  
Won Youl Choi
Keyword(s):  
Heavy Metals ◽  
Humic Acid ◽  
Uv Light ◽  
Removal Rate ◽  
Membrane System ◽  
Tio2 Powder ◽  
Metal Membrane ◽  
Tio2 Particles ◽  
Positive Effect

This study was conducted to evaluate the applicability of photocatalytic metal membrane system for the treatment of humic acid and heavy metals in aqueous solution. The catalysts, TiO2 powder P25 Degussa and metal membrane with 0.5 μm nominal pore size were used for experiments. Removal efficiency of humic acid and heavy metals increased with the increase of TiO2 dosage, however decreased over 0.3 g/L of TiO2 dosage. The addition of H2O2 as an oxidation reagent had a positive effect for the removal rate of humic acid and heavy metals. Metal membrane with stainless steel seemed to be quite stable to UV light with oxidation reagent in long-term operational periods over 6 months. Moreover, TiO2 particles can be effectively separated from the treated water by membrane rejection and the permeation flux was also enhanced by the combination of photocatalytic reaction.

Performance of Photocatalytic Microfiltration with Hollow Fiber Membrane

2007 ◽  
Vol 544-545 ◽  
pp. 95-98 ◽  
Author(s):  
Jong Tae Jung ◽  
Jong Oh Kim ◽  
Won Youl Choi
Keyword(s):  
Heavy Metals ◽  
Humic Acid ◽  
Rate Constant ◽  
Hollow Fiber ◽  
Reaction Rate ◽  
Hollow Fiber Membrane ◽  
Membrane Surface ◽  
Reaction Rate Constant ◽  
Operational Parameters ◽  
Tio2 Particles

The purpose of this study is to investigate the effect of the operational parameters of the UV intensity and TiO2 dosage for the removal of humic acid and heavy metals. It also evaluated the applicability of hollow fiber microfiltration for the separation of TiO2 particles in photocatalytic microfiltration systems. TiO2 powder P-25 Degussa and hollow fiber microfiltration with a 0.4 μm nominal pore size were used for experiments. Under the conditions of pH 7 and a TiO2 dosage 0.3 g/L, the reaction rate constant (k) for humic acid and heavy metals increased with an increase of the UV intensity in each process. For the UV/TiO2/MF process, the reaction rate constant (k) for humic acid and Cu, with the exception of Cr in a low range of UV intensity, was higher compared to that of UV/TiO2 due to the adsorption of the membrane surface. The reaction rate constant (k) increased as the TiO2 dosage increased in the range of 0.1~0.3 g/L. However it decreased for a concentration over 0.3 g/L of TiO2. For the UV/TiO2/MF process, TiO2 particles could be effectively separated from treated water via membrane rejection. The average removal efficiency for humic acid and heavy metals during the operational time was over 90 %. Therefore, photocatalysis with a membrane is believed to be a viable process for humic acid and heavy metals removal.

Sonochemical Composition of Humic Substances with Magnetic Nanoparticles and H2O2

2014 ◽  
Vol 522-524 ◽  
pp. 439-444
Author(s):  
Song Lin Wang ◽  
Ming Dan ◽  
Si Wu ◽  
Ning Zhou ◽  
Qi Zhang
Keyword(s):  
Magnetic Nanoparticles ◽  
Humic Acid ◽  
Humic Substances ◽  
Removal Efficiency ◽  
Enhancement Effect ◽  
Oh Radicals ◽  
Acid Degradation ◽  
Adsorption Surface

The experiments of TOC and UV254 removal of humic acid (HA) solution by ultrasound (US) irradiation with the presence of H2O2 and Fe3O4 nanoparticles (NP) were carried out. The comparison of enhancement effect of humic acid sonolysis by H2O2 and NP was investigated. It was found that removal efficiency of TOC and UV254 increased significantly in the order of US< US/NP< US/H2O2< NP/H2O2< US/NP/H2O2. During US/NP/H2O2 combining process, the contribution of H2O2 should be presenting most OH radicals for humic acid degradation, Fe3O4 nanoparticles would supply adsorption surface for humic acid to have more chance to be oxidized, and ultrasonic would work as main energy for OH radicals generation and offer sonochemical environment.

scholarly journals Production of High Flux Poly(Ether Sulfone) Membrane Using Silica Additive Extracted from Natural Resource

Membranes ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 17 ◽  
Author(s):  
Sri Mulyati ◽  
Syawaliah Muchtar ◽  
Mukramah Yusuf ◽  
Nasrul Arahman ◽  
Sofyana Sofyana ◽  
...  
Keyword(s):  
Humic Acid ◽  
Pore Size ◽  
Membrane System ◽  
Contact Angles ◽  
Angle Measurement ◽  
Water Contact ◽  
Minimum Diameter ◽  
Membrane Pore ◽  
Membrane Pore Size ◽  
Pes Membrane

This paper reports the application of silica derived from natural biomasses of rice husk and bagasse ashes as membrane modifying agents. The modification was conducted on poly(ether sulfone) (PES) membrane by blending the silica into the dope solution. The modification was aimed to improve the structure and hydraulic performance of the resulting PES membrane. The effects of silica addition to the membrane system were evaluated through the analysis of change in chemical structure using ATR-FTIR, surface morphological change using AFM, and surface hydrophilicity using water contact angle measurement. SEM and AFM images show the silica loading significantly affects the membranes morphologies. Silica loading also promotes hydrophilic property as shown by the decrease in water contact angles from 82° to 52–60° due to the presence of polar groups in some residual silica in the membrane matrix. Silica blending also leads to the formation of membranes with higher permeability of up to three folds but lower humic acid rejection (78–62%). The findings indicate the role of silica to enhance the membrane pore size. The ability of membrane to reject humic acid (of 0.8 nm minimum diameter) indicating that the resulting membranes were in between tight ultrafiltration and nanofiltration type. Nonetheless, applying too-high silica concentration decreased the humic acid rejection most likely due to over enlargement of the membrane pore size.

Removal of humic acid foulant from ultrafiltration membrane surface using photocatalytic oxidation process

2005 ◽  
Vol 51 (6-7) ◽  
pp. 373-380 ◽  
Author(s):  
H. Fang ◽  
D.D. Sun ◽  
M. Wu ◽  
W. Phay ◽  
J.H. Tay
Keyword(s):  
Humic Acid ◽  
Acid Solution ◽  
Calcium Ions ◽  
Photocatalytic Oxidation ◽  
Ph Value ◽  
Membrane Surface ◽  
Reaction Times ◽  
Permeate Flux ◽  
Filtration Time ◽  
Tio2 Particles

The experimental results indicated that without the TiO2 particles and PCO treatment, the permeate flux of ultrafiltration (UF) membrane declined to 40% of the initial permeate flux after 8 hours filtration. Feeding the humic acid solution with TiO2 particles dosage of 1 g/L with calcium ions into UF membrane, after the same filtration time and PCO reaction at 120 minutes, the permeate flux was increased to about 90% of the initial permeate flux. At longer PCO reaction times, a better water quality of UF permeate was observed. It has been found that with the coexistence of calcium ions in humic acid solution, the smaller molecular fragments of humic acid (HA) generated by PCO reaction may be transferred to the surface of TiO2 by means of adsorption. The humic acid adsorption by TiO2 in the presence of Ca2+ is also pH dependent. The adsorption rates were 21.0, 14.9 and 10.8 ppmTOC/gTiO2 for pH value of 4, 7 and 10 respectively. The combination of effects of PCO mineralization of humic acid into CO2 and adsorption of humic acid by TiO2 through the forming of HA-Ca2+-TiO2 aggregate particles were responsible for the removal of humic acid foulant from UF membrane surface.

Helminth eggs removal by microscreening for water reclamation and reuse

2008 ◽  
Vol 57 (5) ◽  
pp. 715-720 ◽  
Author(s):  
S. Quinzaños ◽  
C. Dahl ◽  
R. Strube ◽  
R. Mujeriego
Keyword(s):  
Pore Size ◽  
Removal Efficiency ◽  
Reclaimed Water ◽  
Quality Criteria ◽  
Complete Removal ◽  
Water Quality Criteria ◽  
Filter Cloth ◽  
Latex Particles ◽  
Helminth Eggs ◽  
Adverse Environmental Conditions

Irrigation with reclaimed water is becoming a practical alternative to conventional irrigation in semi-arid areas of the Mediterranean like Spain, but it requires a reliable treatment process to provide a safe water supply. Helminth eggs are one of the main concerns for the safe use of reclaimed water, as they can survive adverse environmental conditions and they are highly infective. Spanish water quality criteria and International guidelines set a limit of 0.1 eggs/l for water uses with unrestricted human exposure. Two microscreening processes have been tested to determine their potential for helminth eggs removal, after a conventional physic-chemical reclamation process. Hydrotech Drum and Discfilters®, provided with 10 μm pore size filter cloth, were tested to determine their efficiency for helminth eggs straining. An experimental test was conducted using 20 μm spherical latex particles, as surrogates for helminth eggs, to test the removal efficiency of a small full-scale drumfilter. In a subsequent laboratory test, actual Trichuris suis eggs were strained using a 10 μm pore size filter cloth from a discfilter. Results from both tests indicate that drum and discfilters are able to achieve 99% removal efficiency for spherical latex particles and a complete removal for helminth eggs in reclaimed water.

Degradation of humic acid using hydrogen peroxide activated by CuO-Co3O4@AC under microwave irradiation

2017 ◽  
Vol 330 ◽  
pp. 783-791 ◽  
Author(s):  
Xiaosheng Yao ◽  
Qintie Lin ◽  
Lingze Zeng ◽  
Jiangxin Xiang ◽  
Guangcai Yin ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Humic Acid ◽  
Microwave Irradiation

Adsorptive removal of trace oxytetracycline from water by acid-modified zeolite: influencing factors

2013 ◽  
Vol 68 (11) ◽  
pp. 2473-2478 ◽  
Author(s):  
Wenhao An ◽  
Hua Xiao ◽  
Man Yu ◽  
Xiaoyang Chen ◽  
Yuxin Xu ◽  
...  
Keyword(s):  
Humic Acid ◽  
Removal Efficiency ◽  
Natural Zeolite ◽  
Opposite Effect ◽  
Swine Wastewater ◽  
Adsorption Efficiency ◽  
Tetracycline Antibiotics ◽  
Modified Zeolite ◽  
Alkaline Conditions ◽  
Acidic Conditions

Because of the wide use of antibiotics in the livestock industry, trace tetracycline antibiotics are frequently detected in swine wastewater and water bodies near pig farms. Based on natural zeolite, modified zeolite was synthesized by treatment with nitric acid. As one kind of typical tetracyclines, oxytetracycline (OTC) was chosen as the target adsorbate. Removal of trace OTC by modified zeolite and the effects of several main water matrices on OTC adsorption were studied in detail. OTC removal efficiency by acid-modified zeolite was about 90%, compared to less than 20% by natural zeolite. In general, in acidic conditions the removal efficiency of OTC by modified zeolite was about 90%, which was much higher than 20–35% in alkaline conditions. An increase in ionic strength from 0.01 to 1.0 M led to a decrease in adsorption efficiency from 90 to 27%. The presence of 10.0 mg L−1 dissolved humic acid accelerated sorption of OTC on modified zeolite, while 100.0 mg L−1 humic acid resulted in the opposite effect. An increase in temperature contributed to enhancing the adsorption efficiency.

Impacts of Changing Operational Parameters of In Situ Chemical Oxidation (ISCO) on Removal of Aged PAHs from Soil

2012 ◽  
Vol 15 (2) ◽  
Author(s):  
Paula Cajal-Mariñosa ◽  
Ruth G. de la Calle ◽  
F. Javier Rivas ◽  
Tuula Tuhkanen
Keyword(s):  
Hydrogen Peroxide ◽  
Removal Efficiency ◽  
Contaminated Soil ◽  
Chemical Oxidation ◽  
Contaminant Removal ◽  
Operational Parameters ◽  
In Situ Chemical Oxidation ◽  
Different Types ◽  
Wood Impregnation

AbstractThe removal efficiency of two different types of peroxide addition, catalyzed hydrogen peroxide (CHP) and sodium percarbonate (SPC) were compared on a highly PAH-contaminated soil from a wood impregnation site. In an attempt to simulate real in situ reagents delivery, experiments have been carried out in acrylic columns. The main parameters affecting contaminant removal were the reagent’s temperature and the total addition of peroxide (g

Sign in / Sign up

Export Citation Format

Share Document