scholarly journals Treatment of Synthetic Produced Water using Hybrid Membrane Processes

2018 ◽  
Vol 22 (2) ◽  
Author(s):  
N. Chin ◽  
S. O. Lai ◽  
K. C. Chong ◽  
S. S. Lee ◽  
C. H. Koo ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Produced Water ◽  
Removal Rate ◽  
Pure Water ◽  
Water Flux ◽  
Transmembrane Pressure ◽  
Oil Removal ◽  
Permeate Flux ◽  
Uf Membranes ◽  
Pes Membrane

The study was concerned with the treatment of tank dewatering produced water using hybrid microfiltration (MF) and ultrafiltration (UF) processes. The pre-treatment MF membrane was fabricated with polyethersulfone (PES), n-methyl-2-pyrrolidone (NMP) and polyvinylpyrrolidone (PVP). The UF membranes meanwhile contained additional component, i.e., titanium dioxide (TiO2) nanoparticles in the range of zero to 1.0 wt.%. The membrane performances were analysed with respect to permeate flux, oil removal and flux recovery ratio. An increase in TiO2 nanoparticles enhanced the pore formation, porosity and pure water permeability due to improved hydrophilicity. The permeate flux of UF membranes increased with the increase of TiO2 nanoparticles and pressure. The oil removal rate by MF process was only 52.35%, whereas the oil rejection efficiency was between 82.34% and 95.71% for UF process. It should be highlighted that the overall oil removal rate could achieve as high as 97.96%. Based on the results, the PES membrane incorporated with 1.0 wt.% TiO2 was proved to be the most promising membrane at a transmembrane pressure of 3 bar. Although 1.0 M NaOH solution could be used as cleaning agent to recover membrane water flux, it is not capable of achieving good results as only 52.18% recovery rate was obtained.

PREPARATION AND CHARACTERIZATION OF SUPERHYDROPHILIC NANOCOMPOSITE ULTRAFILTRATION MEMBRANES FOR TREATMENT OF HIGHLY CONCENTRATED OIL-IN-WATER EMULSION

2017 ◽  
Vol 79 (1-2) ◽  
Author(s):  
G. S. Lai ◽  
W. J. Lau ◽  
P. S. Goh ◽  
Y. H. Tan ◽  
A. F. Ismail ◽  
...  
Keyword(s):  
Removal Rate ◽  
Pure Water ◽  
Water Flux ◽  
Industrial Applications ◽  
Polymeric Membrane ◽  
Oil Removal ◽  
Water Emulsion ◽  
Pes Membrane ◽  
Oil In Water Emulsion ◽  
Oily Solution

In oily wastewater treatment using membrane technology, surface fouling is the major issue that could deteriorate membrane flux and shorten its lifespan. Therefore, nanocomposite membranes were developed in this study by incorporating titanium dioxide (TiO2) and hydrous manganese oxide (HMO) nanoparticles into polymeric membrane matrix. Three different types of membranes were fabricated. They were pristine PES and membrane incorporated with TiO2 or HMO. With respect to pure water flux, TiO2- and HMO-incorporated membranes showed value of 57 and 40 L/m2.h, respectively. These values were 33-90% higher than that of control PES membrane. In treating 500 ppm oily solution, TiO2 membrane exhibited the highest water flux. However, the membrane’s oil removal rate was slightly compromised. When tested with higher concentration of oily solution (5,000 or 10,000 ppm), TiO2- and HMO-incorporated membranes still showed promising water flux with 94.5-99.6% oil removal rate. This proved that ultrafiltration membrane incorporated with suitable nanomaterials could improve the water flux of pristine PES membrane and is of more practical for industrial applications.

scholarly journals Reduction of Total Suspended Solids, Turbidity and Colour of Palm Oil Mill Effluent using Hybrid Coagulation-Fltrafiltration Process

2018 ◽  
Vol 23 (1) ◽  
Author(s):  
W. Q. Ng ◽  
S. O. Lai ◽  
K. C. Chong ◽  
S. S. Lee ◽  
C. H. Koo ◽  
...  
Keyword(s):  
Palm Oil ◽  
Suspended Solids ◽  
Pure Water ◽  
Total Suspended Solids ◽  
Palm Oil Mill Effluent ◽  
Transmembrane Pressure ◽  
Permeate Flux ◽  
Coagulation Process ◽  
Palm Oil Mill ◽  
Uf Membranes

High consumption and production of palm oil have led to the massive generation of palm oil mill effluent (POME). This study was intended to reduce the total suspended solids (TSS), turbidity and colour using hybrid coagulation-ultrafiltration process. POME was pre-treated with coagulation process using polyaluminium chloride (PAC) and optimization of operating condition for coagulation process was performed. The coagulation results revealed that optimum pH, dosage of coagulant and rapid mixing speed were pH 4, 600 mg/L and 200 rpm, respectively. It achieved the highest percent reduction of TSS, turbidity and colour with 99.74%, 94.44% and 94.60%, respectively. Ultrafiltration (UF) membrane was fabricated using polyethersulfone (PES), polyvinylpyrrolidone (PVP) and titanium dioxide (TiO2­) nanoparticle. Different concentrations ranging from zero and 1.0 wt% of TiO2 nanoparticles were added into the dope solution. The characterization studies of UF membranes confirmed that higher concentration of TiO2 provided higher pure water permeability and more porous structure in the UF membranes. The amount of TiO2 in membrane only affected the permeate flux but had no obvious effects on the reduction of TSS, turbidity and colour. The optimum transmembrane pressure was found to be 3 bar, resulting in the greatest reduction of TSS, turbidity and colour.

The Optimization of RHS-polysulfone Membrane towards Operating Condition for Humic Acid Removal

2021 ◽  
Vol 02 (01) ◽  
Author(s):  
Mohd Riduan Jamalludin ◽  
◽  
Siti Khadijah Hubadillah ◽  
Zawati Harun ◽  
Muhamad Zaini Yunos ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Ionic Strength ◽  
Membrane Separation ◽  
Pure Water ◽  
Water Flux ◽  
Separation Process ◽  
Transmembrane Pressure ◽  
Polysulfone Membrane ◽  
Optimal Value ◽  
Pure Water Flux

This study investigates the effects of rice husk silica (RHS) as additive in the polysulfone membrane to enhance antifouling properties in membrane separation process. The performance (of what?) was evaluated in term of pure water flux (PWF), rejection and antifouling properties. The optimized of normalized flux (Jf /Jo) at different parameter in filtration (pH, ionic strength and tranmembrane-pressure) was carried out by using the response surface methodology (RSM). The results showed that the addition of 4 wt. % RHS give the highest flux at 300.50 L/m².hour (LMH). The highest rejection was found at 3 wt. % of RHS membrane with value 98% for UV254 and 96% for TOC. The optimal value of Jf/Jo was found at 0.62 with the condition of pH: 6.10, ionic strength: 0.05 mol/L and transmembrane-pressure: 2.67 bars. Optimize of RSM analysis from ANOVA also proved that the error of model is less than 0.05% which indicates that the model is significant.

scholarly journals Zwitterion-Modified Ultrafiltration Membranes for Permian Basin Produced Water Pretreatment

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1710 ◽  
Author(s):  
Mirjalal Babayev ◽  
Hongbo Du ◽  
Venkata S. V. Botlaguduru ◽  
Raghava R. Kommalapati
Keyword(s):  
Membrane Fouling ◽  
Oil And Gas ◽  
Produced Water ◽  
Forward Osmosis ◽  
Dip Coating ◽  
Permeate Flux ◽  
Permian Basin ◽  
Water Pretreatment ◽  
Uf Membranes ◽  
Surface Modified

Unconventional oil and gas extraction generates large quantities of produced water (PW). Due to strict environmental regulations, it is important to recover and reuse PW. In this study, commercial polyethersulfone (PES) ultrafiltration (UF) membranes were surface-modified with zwitterionic polymer 3-(3,4-Dihydroxyphenyl)-l-alanine (l-DOPA) solution to alleviate membrane fouling during the ultrafiltration of shale oil PW of the Permian Basin. UF membranes were coated in l-DOPA solution by using a dip coating technique. Membrane characterization tests confirmed successful l-DOPA coating on UF membranes. While performing the experiments, permeate flux behaviors of the uncoated and coated membranes and antifouling resistance of the zwitterionic coating were evaluated. Among the coated UF membranes with varying coating times from one day to three days, the three-day coated UF membrane showed a good flux performance and the highest fouling resistance. The flux reduced by 38.4% for the uncoated membrane, while the reduction was 16% for the three-day coated membrane after the 5 h ultrafiltration of PW. Both improvements of the flux performance and recovery ratio are attributed to a negatively-charged surface developed on the membranes after the zwitterionic coating. The UF pretreatment also improved the flux behavior of the later forward osmosis (FO) process for PW treatment.

scholarly journals Ultrafiltration membrane process for produced water treatment: experimental and modeling

2013 ◽  
Vol 3 (3) ◽  
pp. 249-259 ◽  
Author(s):  
Ramin Badrnezhad ◽  
Ali Heydari Beni
Keyword(s):  
Produced Water ◽  
Oxygen Demand ◽  
Experimental Results ◽  
Transmembrane Pressure ◽  
Permeation Flux ◽  
Cake Filtration ◽  
Pore Blocking ◽  
Uf Membranes ◽  
Almost All ◽  
Filtration Model

Produced water has been a big issue of water and environmental pollution. In this research, results of an experimental and modeling study on the separation of oil and salts from produced water using a rectangular flat sheet polyacrylonitrile (PAN) ultrafiltration (UF) membrane (nominal pore size of 10 nm) were analyzed. The effects of transmembrane pressure (TMP) (1, 2, 3 and 5 bar) on permeation flux of UF membranes for treatment of produced water were investigated. The results show that the average removal of chemical oxygen demand (COD) and total organic carbon (TOC) during the experiments were 94 and 83%, respectively. The UF membrane showed high potential for application in industry for produced water reusing purposes. The experimental results showed that oil retentions of almost all the membranes were over 99% and oil concentrations in the permeate were below 0.2 mg L–1. In addition, the fouling mechanism involved in UF processing of produced water was investigated by modeling. Experimental results of permeation flux were compared to the results of the fouling models. After the cake filtration model, the intermediate pore blocking model was found to predict the experimental data very well.

scholarly journals A Combination of Aqueous Extraction and Polymeric Membranes as a Sustainable Process for the Recovery of Polyphenols from Olive Mill Solid Wastes

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1868 ◽  
Author(s):  
Conidi ◽  
Egea-Corbacho ◽  
Cassano
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Food Additives ◽  
Practical Interest ◽  
Biologically Active ◽  
Transmembrane Pressure ◽  
Permeate Flux ◽  
Total Antioxidant ◽  
Uf Membranes ◽  
Olive Mill

Polyamide commercial membranes in flat-sheet configuration and with molecular weight cut-off (MWCO) in the range of ultrafiltration (UF) to nanofiltration (NF) were tested for the recovery of phenolic compounds from clarified olive mill solid waste (OMSW) aqueous extracts. The performance of selected membranes was evaluated in terms of productivity (permeate flux) and selectivity towards biologically active compounds (such as phenolic compounds, flavanols, and hydroxycinnamic acids derivatives) and total antioxidant activity (TAA) as a function of transmembrane pressure (TMP). NF membranes produced higher permeate fluxes and a lower fouling index in comparison with UF membranes. Retention of bioactive compounds was also significantly higher for NF membranes than for UF membranes. In particular, membranes with MWCO in the range 150–500 Da showed rejection towards flavanols and hydroxycinnamic acid derivatives of about 100%. On the other hand, the rejection towards TAA and total polyphenols was of about 90% and 72%, respectively. Therefore, NF retentate fractions appear of practical interest for the production of food additives and food supplements due to their high antioxidant activity.

Sodium Alginate Modified Hydroxyapatite Nanotubes as a Novel Ecofriendly Additive for Preparation of Polyethersulfone Hybrid Ultrafiltration Membranes

2021 ◽  
Vol 01 ◽  
Author(s):  
Yongfeng Mu ◽  
Jun Liu ◽  
Han Feng ◽  
Guibin Wang
Keyword(s):  
Performance Test ◽  
Low Cost ◽  
Water Flux ◽  
Hybrid Membrane ◽  
Ultrafiltration Membranes ◽  
The Poor ◽  
Modification Process ◽  
Uf Membranes ◽  
Pes Membrane ◽  
Antifouling Ability

Background: Hydrophilic nanomaterials have been extensively exploited their applications in the field of hybrid water treatment membranes. However, some of the modification process to nanomaterials may be complicated and the nonselective pores caused by the poor compatibility between nanoparticles and the polymer matrix impair the rejection efficiency for ultrafiltration application. Thus it is highly desirable to develop a kind of effective nano dopant with favorable compatibility by a facile way for the preparation of ultrafiltration membranes. Objective: The aim of this study was to fabricate a novel environmentally friendly and low-cost nano additive with good compatibility for the preparation of ultrafiltration membranes. Methods: Hydroxyapatite nanotubes were prepared via a biomimetic process and then SA was coated on the surface of hydroxyapatite nanotubes. Subsequently, a series of hybrid ultrafiltration membranes was fabricated with different amount of modified HANTs and polyethersulfone (PES). Results: Exhaustive characterizations were conducted for the membranes including hydrophilicity, porosity, mean pore size, morphologies and UF performance test. The highest water flux of the hybrid membranes displayed 1.9 times that of original PES membrane. Meanwhile, the hybrid membrane with 0.2% hydroxyapatite nanotubes obtained elevated antifouling ability, achieving flux recovery ratio of 85.6%. Conclusion: The facile coating of SA endowed the nanotubes improved hydrophilicity and meanwhile enhanced the compatibility between PES and HANTs. This work provides a facile way in the construction of green nanofillers and promising results in preparation of hybrid UF membranes.

scholarly journals Synthesizing Ag/PDA/PES Antibacterial Membrane for Natural Organic Molecules Removal

2018 ◽  
Vol 65 ◽  
pp. 05023 ◽  
Author(s):  
Kok Poh Wai ◽  
Chai Hoon Koo ◽  
Yean Ling Pang ◽  
Woon Chan Chong ◽  
Woei Jye Lau
Keyword(s):  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
X Ray Diffraction ◽  
X Ray ◽  
Membrane Performance ◽  
Dope Solution ◽  
And Performance ◽  
Pes Membrane ◽  
Contact Angle Analysis

Silver nanoparticles (NP) was successfully immobilized on polydopamine (PDA) supported polyethersulfone (PES) membrane via a redox reaction. Polyvinylpyrrolidone (PVP) was added into membrane dope solution as a pore-forming agent. Four pieces of membranes (M1, M2, M3 and M4) were fabricated with different active layer coatings to compare their morphological and performance properties. The differences between each sample were highlighted as follow: M1 (pristine PES), M2 (PES+PVP), M3 (PDA/PES+PVP) and M4 (Ag/PDA/PES+PVP). All membranes were characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction and contact angle analysis. The membrane performance was examined using pure water permeability (PWP) test, antibacterial test and humic acid (HA) rejection test. Pristine M1 membrane showed that PWP of 27.16 LMH/bar and HA rejection of 84 %. In this study, it was found that the addition of PVP as a pore agent into the membrane M2 increased water flux but slightly deteriorated HA rejection. Coating of PDA on M3 and immobilizing silver NP on M4 membrane surface have improved HA rejection but compromised PWP. The results showed that membrane M4 carried excellent antibacterial property and highest HA rejection among all fabricated membranes.

scholarly journals Effect of sonochemical synthesized TiO2 nanoparticles and coagulation bath temperature on morphology, thermal stability and pure water flux of asymmetric cellulose acetate membranes prepared via phase inversion method

2012 ◽  
Vol 18 (3) ◽  
pp. 385-398 ◽  
Author(s):  
Reza Abedini ◽  
Mahmoud Mousavi ◽  
Reza Aminzadeh
Keyword(s):  
Thermal Stability ◽  
Tio2 Nanoparticles ◽  
Phase Inversion ◽  
Pure Water ◽  
Water Flux ◽  
Composite Membranes ◽  
Bath Temperature ◽  
Coagulation Bath ◽  
Pure Water Flux ◽  
Coagulation Bath Temperature

In this study, asymmetric pure CA and CA/ TiO2 composite membranes were prepared via phase inversion by dispersing TiO2 nanopaticles in the CA casting solutions induced by immersion precipitation in water coagulation bath. TiO2 nanoparticles, which were synthesized by the sonochemical method, were added into the casting solution with different concentrations. Effects of TiO2 nanoparticles concentration (0 wt. %, 5wt.%, 10wt.%, 15wt.%, 20wt.% and 25wt.%) and coagulation bath temperature (CBT= 25?C, 50?C and 75?C) on morphology, thermal stability and pure water flux (PWF) of the prepared membranes were studied and discussed. Increasing TiO2 concentration in the casting solution film along with higher CBT resulted in increasing the membrane thickness, water content (WC), membrane porosity and pure water flux (PWF), also these changes facilitate macrovoids formation. Thermal gravimetric analysis (TGA) shows that thermal stability of the composite membranes were improved by the addition of TiO2 nanopaticles. Also TGA results indicated that increasing CBT in each TiO2 concentration leads to the decreasing of decomposition temperature (Td) of hybrid membranes.

Membrane Performance: TiO2 Nanoparticles Coated on Polysulfone (PSf) Ultrafiltration Membrane Surfaces

2013 ◽  
Vol 65 (4) ◽  
Author(s):  
Siti Hawa Mohamad ◽  
Hasan Zuhudi Abdullah ◽  
Maizlinda Izwana Idris ◽  
Zawati Harun
Keyword(s):  
Tio2 Nanoparticles ◽  
Uv Light ◽  
Pure Water ◽  
Water Flux ◽  
Sem Analysis ◽  
Ultrafiltration Membrane ◽  
Membrane Surfaces ◽  
Phase Inversion Technique ◽  
Coated Membranes ◽  
Uv Lamp

This study focuses on the modification polysulfone (PSf) ultrafiltration membrane surfaces via coated and irradiated with titanium dioxide (TiO2) nanoparticles with UV lights respectively. Basically, the flat sheet membrane was prepared using phase inversion technique with three conditions: (i) uncoated PSf membrane, (ii) coated PSf membrane with TiO2 and (iii) PSf membrane coated with TiO2 irradiated to UV. The coating process was carried out using dipping method into TiO2 nanoparticles suspension at different concentrations (0.01, 0.03 and 0.05 wt.%). Membrane was immersed in all suspension for 15 and 30 minutes. Then, coated membranes were exposured under 184 Watts UV lamp at two different durations, 15 and 30 minutes. The performance of membranes was evaluated in terms of pure water flux (PWF) and humic acid (HA) rejection. The morphology of membranes was characterized using scanning electron microscopy (SEM). Analysis of the result revealed that 15 minutes immersion of membrane in TiO2 suspension showed a better performance in term permeation and rejection of compared to 30 min immersion. This is due to the pore plugging as time of immersion increased. Therefore, the coated membranes with 0.03 wt.% of TiO2 nanoparticles at 15 minutes immersion and 15 minutes exposure of UV light irradiation were determined as an ideal performance of rejection and permeation compared to the other.

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