Low-cost ceramic microfiltration membrane made from natural phosphate for pretreatment of raw seawater for desalination

Belgada, Abdessamad; Achiou, Brahim; Younssi, S. Alami; Charik, Fatima Zohra; Ouammou, Mohamed; Cody, Jason A.; Benhida, Rachid; Khaless, Khaoula

doi:10.1016/j.jeurceramsoc.2020.09.064

Cited by 56 publications

(20 citation statements)

References 37 publications

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“…With no significant drop; sample number 14 has the lowest conductivity value which was 12.85 Ms/cm. In this regards, [51] recommended the use ceramic microfiltration membrane to enhance sea water quality, while reverse osmosis unit remains the efficient method to remove complex matrix of seawater minerals [49]. However, slow sand filtration has failed in reducing the conductivity into an acceptable level.…”

Section: Resultsmentioning

confidence: 99%

Evidence of Improved Seawater Quality using a Slow Sand Filtration

Abushandi¹

2021

Adv. sci. technol. eng. syst. j.

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In recent years water treatment methods under pressurized systems have been considered as the optimum high-rate filtration techniques. Unpressurized-slow sand filtration can be the cheapest and most efficient method, among others. This research aims to test the performance of a reliable seawater filtration system, using three different iterations. The filters have been designed considering many types of filtration layers such as sand, gravel, palm chlorophyll and other layers. The results of routine tests showed that the seawater pH, and TSS, and conductivity in the Gulf of Oman are relatively high. The pH values were decreased from 9.4 to 8.4 (filter 1), 9.0 (filter 2), and 8.7 (filter 3). Filter three has a reduced value of conductivity from 13.06 to 12.81 Ms/cm while a slight increase in filters 1 and 2. The TSS values were significantly reduced from 12.42 mg/L to 1.682 mg/L (filter 1), 2.478 mg/L (filter 2), and 1.200 mg/L (filter 3). This reflects the efficiency for each filter for this parameter is 86.5% for filter 1, 80% for filter 2, while 90.3% for filter three. Water velocity through each layer was monitored using Darcy law where the water of filter three has the longest residence time and slowest flow per time. The fastest flow was in filter one with an average of 0.5 L/minutes, filter two has an average flow of 0.088 L/minutes, while filter 3 has a flow rate of 0.026 L/minutes. The third filter has provided the best performance according to the results. Statistical analysis was conducted to understand the correlation between different parameters. As per Pearson correlation, there is a significant correlation between pH and conductivity values for 19 samples (0.989), while the correlation with TSS is relatively weak (0.364).

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Section: Resultsmentioning

confidence: 99%

Evidence of Improved Seawater Quality using a Slow Sand Filtration

Abushandi¹

2021

Adv. sci. technol. eng. syst. j.

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“…The shape of membrane pores can be roughly divided into dense nonporous, sponge-like, and finger-like pores. − Polyvinylidene fluoride (PVDF) is a highly nonreactive thermoplastic fluoro-polymer, characterized by high mechanical strength, acid and alkali resistance, and good chemical stability. Most importantly, PVDF stands out with an excellent dielectric, is biocompatible, and has high separation accuracy and high efficiency. − Due to this, it has attracted considerable attention of researchers focused on membrane separation. To obtain PVDF membranes with different separation properties and to perform the separation efficiently, the membrane structure and the shape of membrane pores are often modified by changing the concentration of casting solution, additives, composition, and temperature of coagulation. − As a PVDF-based polymer is characterized by a certain regularity, when the casting liquid temperature is lower than the melting point of the polymer, it can be immersed in a coagulation bath.…”

Section: Introductionmentioning

confidence: 99%

Phase-Field Simulation of the Effect of Coagulation Bath Temperature on the Structure and Properties of Polyvinylidene Fluoride Microporous Membranes Prepared by a Nonsolvent-Induced Phase Separation

et al. 2022

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We used the phase-field model of the existing Nonsolvent Induced Phase Separation (NIPS) method to add the variable of temperature in simulating the changes in the process of membrane formation. The polyvinylidene fluoride (PVDF) membrane system was applied to examine the influence of coagulation bath temperature change on the skin-sublayer of the membrane structure, thereby elucidating the development process of membrane structure under different conditions and shedding light on the most suitable coagulation bath temperature ranges. It was found that as coagulation bath temperature increased, the number of interface pores in the outer skin layer decreased, but the size increased. As a result, it changed from the crack shape to round-hole shape, thus making the pore structure looser. In the sublayer, the mesh support structure was increased, which enhanced the mechanical strength of the membrane. Relevant experiments also verify the effectiveness of the model.

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“…The electrospun nanofibrous mat (ENM), which exhibits high porosity, high rejection rate, and flexibility in material selection, has been widely used in microfiltration [10][11][12][13][14]. Owing to its high porosity, the ENM typically has a high filtrate flux, for example, up to 5,541 L m -2 h -1 at 20 kPa driving pressure, superior to many other membranes whose filtrate flux is below 1,000 L m -2 h -1 [15][16][17]. Moreover, the ENM does not have straight-through pores.…”

Section: Introductionmentioning

confidence: 99%

Combinatory electrospray and electrospinning to produce multi-layered membrane with enhanced mechanical property

Xue

Zheng

Shen

et al. 2022

Environmental Engineering Research

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Electrospun nanofibrous mats (ENM) have been extensively used for removal of suspended particles, cells and bacteria in membrane filtration because of its high porosity and permeability. However, microfiltration process is driven by a certain transmembrane pressure, and the filtration performance of traditional ENM are thereby hindered by its limited mechanical property. In this study, we propose a new strategy that sandwich the ENM between two layers of electrospray-deposited microparticles to enhance the mechanical properties of ENM membrane. Through a suitable thermal treatment, the microparticles stick with each other forming firm networks, while the ENM is rarely influenced. The mechanical tests show that the tensile strength and elastic modulus of the sandwich-structure composite membrane are 5 times and 7 times higher than those of the fibrous membrane, respectively. Meanwhile, the filtration tests show that the rejection rate of the composite membrane is also higher than the fibrous membrane. Our study implies the composite membrane fabricated by layer-by-layer deposition via electrospray and electrospinning has a great potential in microfiltration applications.

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Low-cost ceramic microfiltration membrane made from natural phosphate for pretreatment of raw seawater for desalination

Cited by 56 publications

References 37 publications

Evidence of Improved Seawater Quality using a Slow Sand Filtration

Evidence of Improved Seawater Quality using a Slow Sand Filtration

Phase-Field Simulation of the Effect of Coagulation Bath Temperature on the Structure and Properties of Polyvinylidene Fluoride Microporous Membranes Prepared by a Nonsolvent-Induced Phase Separation

Combinatory electrospray and electrospinning to produce multi-layered membrane with enhanced mechanical property

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