Direct As(III) removal from brackish groundwater by vacuum membrane distillation: Effect of organic matter and salts on membrane fouling

Dao, Thanh Duong; Laborie, Stéphanie; Cabassud, Corinne

doi:10.1016/j.seppur.2015.11.018

Cited by 41 publications

(13 citation statements)

References 19 publications

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“…15 Membrane distillation has also been used for water purification including removing arsenic. [30][31][32][33][34][35] Leveraging thermal evaporation -a physical method -membrane distillation is effective for both As-III and As-V removal. When a high vacuum is applied, it can utilize relative low temperature heat sources, 33 but maintaining a vacuum may hinder its application in low-resource settings and POU applications, and it still needs membranes.…”

Section: Introductionmentioning

confidence: 99%

Direct Arsenic Removal from Water Using Non-Membrane, Low-Temperature Directional Solvent Extraction

et al. 2020

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Arsenic (As) poisoning in water due to natural minerals or industrial pollution is a critical global problem that threatens the health and life of billions. Current arsenic removal techniques involving chemical reaction, ion exchange, or membrane processes can be expensive, inaccessible or infeasible for underdeveloped regions or remote areas. Here, we demonstrate that using a so-called directional solvent extraction (DSE) process, arsenic ions in water can be effectively removed without the need of a membrane or chemical reaction, and this process promises to utilize very low temperature heat (as low as 45 o C). We have tested feed water with different arsenic concentrations and arsenic ions in different forms (As-III and As-V) commonly found in nature. It is demonstrated that DSE using decanoic acid as the directional solvent can purify contaminated water to meet the drinking water standard (arsenic concentration < 10 parts per billion, ppb), and the arsenic removal efficiencies are higher than 91% for As-III and 97% for As-V. Moreover, DSE can remove As-III directly without the need of pre-oxidation, which is required in most of the state of art techniques. DSE can potentially lead to effective arsenic removal technologies with low resource settings that are suitable for remote and underdeveloped regions, which are impacted by arsenic poisoning the most.

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Section: Introductionmentioning

confidence: 99%

Direct Arsenic Removal from Water Using Non-Membrane, Low-Temperature Directional Solvent Extraction

et al. 2020

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“…At the membrane contact, a gel layer develops, increasing resistance to the PF and hence decreasing. The PF declines until the amount of solute at the membrane interface meets the concentration of the gel, at which moment a steady state is attained [48,49]. MAZ 20% membrane PF in stable condition is decreased from 353 to 84 Lm −2 h −1 by adding a 0 to 50,000 mg L −1 salt concentration.…”

Section: Salinity-induced Changes For the Maz 20% Membranementioning

confidence: 99%

The Effect of Ceramic Membranes’ Structure on the Oil and Ions Removal in Pre-Treatment of the Desalter Unit Wastewater

et al. 2021

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Salts, organic materials, and hazardous materials can be found regularly in the effluent from a desalter unit of crude oil. These materials should be separated from the wastewater. Four kinds of inexpensive and innovative ceramic microfiltration membranes (mullite, mullite-alumina (MA 50%), mullite-alumina-zeolite (MAZ 20%), and mullite-zeolite (MZ 40%)) were synthesized in this research using locally available inexpensive raw materials such as kaolin clay, natural zeolite, and alpha-alumina powders. Analyses carried out on the membranes include XRD, SEM, void fraction, the average diameter of the pores, and the ability to withstand mechanical stress. Effluent from the desalter unit was synthesized in the laboratory using the salts most present in the desalter wastewater (NaCl, MgCl2, and CaCl2) and crude oil. This synthesized wastewater was treated with prepared ceramic membranes. It was discovered that different salt concentrations (0, 5000, 25,000, 50,000, 75,000, and 100,000 mg L−1) affected the permeate flux (PF), oil rejection, and ion rejection by the membrane. Results showed that in a lower concentration of salts (5000 and 25,000 mg L−1), PF of all types of ceramic membranes was increased significantly, while in the higher concentration, PF declined due to polarization concentration and high fouling effects. Oil and ion rejection was increased slightly by increasing salt dosage in wastewater due to higher ionic strength. Monovalent (Na+) and multivalent (Ca2+ and Mg2+) ion rejection was reported about 5 to 13%, and 23 to 40% respectively. Oil rejection varied from 96.2 to 99.2%.

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“…This observation indicates that membrane fouling occurs only when HA and Ca 2þ are present together in the long-term operation at relatively low HA level (5 ppm). A few researchers 16,20,21 suggested that the complexation reaction between dissociated HA molecules and Ca 2þ ions could lead to a significant flux decline of MD. It has been reported that the size of HA molecules increased by forming HA-Ca complex in the presence of 100 mg L À1 HA and 20 mM Ca 2þ , 22 which could result in considerable cake layer formation over membrane surface due to the complex accumulation.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Influence of humic acid on the long-term performance of direct contact membrane distillation

Cho

Kwon

Han

et al. 2018

Energy & Environment

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In this study, the influence of humic acid on the treatment of coalbed methane water by direct contact membrane distillation was examined with bench-scale test unit. During short-term distillation (1000 min), high level of humic acid above 50 ppm resulted in significant decrease in permeate flux, while low level of humic acid (∼2 ppm) had little influence on the flux. For the long-term distillation (5000 min), the flux decline began at 3400 min in the presence of 5 ppm humic acid and 5 mM Ca2+, and decreased to ∼40% of initial flux at 5000 min. The spectroscopic analysis of the membrane used revealed that the surface was covered by hydrophilic layers mainly composed of calcite. The membrane fouling effect of humic acid became more significant in the presence of Ca2+ due to more facile calcite formation on the membrane surface. It was demonstrated that humic acid enhanced CaCO3 deposition on the membrane surfaces, thereby expediting the scaling phenomenon.

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Direct As(III) removal from brackish groundwater by vacuum membrane distillation: Effect of organic matter and salts on membrane fouling

Cited by 41 publications

References 19 publications

Direct Arsenic Removal from Water Using Non-Membrane, Low-Temperature Directional Solvent Extraction

Direct Arsenic Removal from Water Using Non-Membrane, Low-Temperature Directional Solvent Extraction

The Effect of Ceramic Membranes’ Structure on the Oil and Ions Removal in Pre-Treatment of the Desalter Unit Wastewater

Influence of humic acid on the long-term performance of direct contact membrane distillation

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