Fluoride removal from brackish groundwater by direct contact membrane distillation

Hou, Deyin; Wang, Jun; Zhao, Changwei; Wang, Baoqiang; Luan, Zhaokun; Sun, Xiangcheng

doi:10.1016/s1001-0742(09)60332-6

Cited by 45 publications

(15 citation statements)

References 22 publications

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“…In these tests, 200 mL of a synthetic fluoride aqueous solution with a concentration of 3.9 mg/L was mixed with 10 g of the homemade bone char in a plastic bottle and then shaken in a water bath at room temperature. Samples were collected and analyzed at 2,4,6,8,10,12,16,20, and 24 hours. Sorption kinetics and isotherms for each size of bone char were then analyzed.…”

Section: Methodsmentioning

confidence: 99%

“…Effective fluoride removal methods such as reverse osmosis [6,7] and membrane technology [8][9][10] are applied in many countries; however the high installation and maintenance costs of these methods generally preclude their use in poor countries. Low cost fluoride removal technologies, such as coagulation [11] and adsorption [12], are more acceptable in developing countries.…”

Section: Introductionmentioning

confidence: 99%

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Defluoridation with Locally Produced Thai Bone Char

Mutchimadilok

Smittakorn

Mongkolnchai-arunya

et al. 2014

Advances in Environmental Chemistry

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The fluoride sorption ability of a locally available bone char is quantified. Both a synthetic solution and natural groundwater samples from several sites are studied and compared to Indian bone char, which is widely accepted and used successfully in India and elsewhere. The Freundlich and Langmuir sorption isotherms were used to quantify sorption properties. Results show that the Thai bone char is as effective as the Indian bone char for removing fluoride from contaminated water, despite the more rigid physical and social constraints found in rural Thailand. Sorption studies with fluoride-contaminated natural groundwater samples also show that chlorides, nitrates, and sulfates had little effect on the removal of fluoride by the homemade bone char.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Defluoridation with Locally Produced Thai Bone Char

Mutchimadilok

Smittakorn

Mongkolnchai-arunya

et al. 2014

Advances in Environmental Chemistry

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“…At the same feed flow rate, increasing the feed temperature enhanced the permeate flux. This trend may be explained by the Antoine equation which predicts an exponential relationship between the driving force (vapor pressure difference) and temperature (Hou et al, 2010). The permeate flux increased with the feed flow rate at the same feed temperature, but the effect of the feed rate on the membrane permeability was small.…”

Section: Effect Of Feed Temperature On Water Fluxmentioning

confidence: 99%

Preparation of high concentration polyaluminum chloride by chemical synthesis-membrane distillation method with self-made hollow fiber membrane

Zhao

Yan

Hou

et al. 2012

Journal of Environmental Sciences

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A method of direct contact membrane distillation (DCMD) with a self-made hollow polyvinylidene fluoride membrane was applied to prepare high concentration polyaluminum chloride (PACl) with high Al b content based on chemical synthesis. The permeate flux and Al species distribution were investigated. The experimental results showed that the permeate flux decreased from 14 to 6 kg/(m 2 ·hr) at the end of the DCMD process, which can be mainly attributed to the formation of NaCl deposits on the membrane surface. The Al b content decreased slightly, only from 86.3% to 84.4%, when the DCMD experiment finished, correspondingly the Al c content increased slightly from 7.2% to 8.5%, and the Al a content remained at 7% during the whole DCMD process. A PACl with Al b content of 84% at total aluminum concentration 2.2 mol/L was successfully prepared by the chemical synthesis-DCMD method.

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“…MD is a non-conventional technology that may be a feasible alternative to remove contaminants from water such as fluoride. Limited research has been conducted on the feasibility of MD technology to remove fluoride and although what has previously been done was on a very small scale [9][10][11]. Fluoride removal on a larger scale has not been reported to our knowledge.…”

Section: Introductionmentioning

confidence: 98%

Effect of air gap membrane distillation parameters on the removal of fluoride from synthetic water

Naji¹,

Bowtell²,

Al-Juboori³

et al. 2018

Desalination and Water Treatment

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a b s t r a c tAs freshly available water around the world becomes scarcer, schemes to reuse and rectify contaminated water sources are becoming a necessity. The implementation of conventional treatment processes increases stress on existing infrastructure resources, requiring significant quantities of energy and/or chemicals, including pre-treatment processes and ongoing maintenance. An unconventional alternative to these processes is air-gap membrane distillation (AGMD), an emerging technology delivering excellent rejection of contaminants over a broad range of operating conditions. While showing great promise, the size of membrane distillation systems in existing literature is not readily scaled to industrial levels. In this paper, we present the results of our research in terms of permeate quality, rejection efficiency and scalability of a large laboratory scale AGMD system, with effective area of approximately 25 times larger than those presented in previous studies. This study found a large discrepancy in flux production when compared with small scale results, with experimental data analysed using normality and residual analysis tests. Statistical analysis of the AGMD process data provides insight into the key driving forces and interactions of feedwater temperature, concentration and flowrate on flux production. Results showed excellent rejection of contaminants (>98%) along with some fouling evident after approximately 25 h of operation.

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Fluoride removal from brackish groundwater by direct contact membrane distillation

Cited by 45 publications

References 22 publications

Defluoridation with Locally Produced Thai Bone Char

Defluoridation with Locally Produced Thai Bone Char

Preparation of high concentration polyaluminum chloride by chemical synthesis-membrane distillation method with self-made hollow fiber membrane

Effect of air gap membrane distillation parameters on the removal of fluoride from synthetic water

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