scholarly journals Removal of Arsenic (III) Present in Ground Water of Bangladesh with Polymer Supported Hydrated Fe(III) Oxides

2015 ◽  
Vol 63 (2) ◽  
pp. 85-89
Author(s):  
Mohammad Arifur Rahman ◽  
Evanta Kabir ◽  
AM Shafiqul Alam
Keyword(s):  
Efficient Method ◽  
Arsenic Removal ◽  
Specific Interaction ◽  
Contaminated Groundwater ◽  
Nacl Solution ◽  
Preferential Adsorption ◽  
Membrane Effect ◽  
Polymer Supported ◽  
Removal Of Arsenic ◽  
Optimized Conditions

In the present study, a technique to remove arsenic has been developed with a polymer-supported hydrated Fe(III) oxide (HFO) by using a strongly basic anionic exchanger IRA-420 as the host material and FeCl3-HCl-NaCl solution as the reaction environment. The optimized conditions were applied to a sample collected from Sonargaon, Dhaka. The removal efficiency of this method was more than 80%, which indicates that this method can be used as an efficient method for arsenic removal in Bangladesh. IRA-420-HFO exhibits more preferential adsorption of arsenic ions which is attributed to the Donnan membrane effect exerted by the host resin (IRA-420) as well as to the loaded HFO particles for specific interaction toward arsenic (III) ions. All the results indicated that HFO polymer derivative is an attractive adsorbent for efficient arsenic (III) removal from contaminated groundwater of Bangladesh.Dhaka Univ. J. Sci. 63(2):85-89, 2015 (July)

Preparation of polymer-supported hydrated ferric oxide based on Donnan membrane effect and its application for arsenic removal

2008 ◽  
Vol 51 (4) ◽  
pp. 379-385 ◽  
Author(s):  
QingJian Zhang ◽  
BingCai Pan ◽  
XinQing Chen ◽  
WeiMing Zhang ◽  
BingJun Pan ◽  
...  
Keyword(s):  
Ferric Oxide ◽  
Arsenic Removal ◽  
Hydrated Ferric Oxide ◽  
Membrane Effect ◽  
Polymer Supported

Fabrication and testing of zirconium-based nanoparticle-doped activated carbon fiber for enhanced arsenic removal in water

RSC Advances ◽  
2016 ◽  
Vol 6 (32) ◽  
pp. 27020-27030 ◽  
Author(s):  
Dandan Zhao ◽  
Yang Yu ◽  
J. Paul Chen
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Arsenic Removal ◽  
Activated Carbon Fiber ◽  
Contaminated Groundwater ◽  
Removal Of Arsenic

A Zr-nanoparticle-doped ACF from this study shows a great potential for removal of arsenic from contaminated groundwater.

scholarly journals Arsenic (III) Removal from Aqueous Water by Indigenous Iron Ore Adsorbent from Balochistan Province of Pakistan

2021 ◽  
Vol 40 (1) ◽  
pp. 16-30
Author(s):  
Zulfiqar Ali Bhatti
Keyword(s):  
Iron Ore ◽  
Arsenic Removal ◽  
Hydride Generation ◽  
Freundlich Isotherm ◽  
Adsorption Method ◽  
X Ray ◽  
Removal Of Arsenic ◽  
Optimized Conditions ◽  
Adsorption Intensity ◽  
Oval Shape

The work focuses on the removal of Arsenic-III (As(III)) from water sample by an indigenous iron ore from Balochistan by adsorption method. Three iron ore samples were analyzed by X-Ray Diffractometer (XRD) and a sample from Shikarap containing iron 36.2% was selected because it contained the highest amount of hematite. The batch study was conducted to examine the adsorption by iron ore and maximum adsorption was observed at pH 6, 1/2 g dose per 50 mL solution, contact time 2 hr and shaking speed 150 rpm. At the optimized conditions, the removal was 89% when monitored at 50μg L-1 initial concentration of arsenic. The arsenic removal was monitored by Atomic Absorption Spectrometer (AAS) using hydride generation. Dubinin - Radushkevich (D-R), Freundlich and Langmuir's isotherms were examined. The highest adsorption capacityof iron ore for As(III) removal was observed 13.67 μg g-1 by Langmuir model and Freundlich isotherm indicated good adsorption intensity with value n = 1.512. Thermodynamic parameters revealed that adsorption was exothermic and physisorption. The Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray (EDX)techniques were applied to scan the surface morphology and the percentage elemental composition of samples respectively. SEM results demonstrated that Shikarap mineral grains are an oval shape and these were changed after the uptake of As(III). The EDX spectra of Shikarap mineral confirm the As(III) adsorption on particles as As 4.19%.

Arsenic removal by MF membrane with chemical sludge adsorption and NF membrane equipped with vibratory shear enhanced process

2003 ◽  
Vol 3 (5-6) ◽  
pp. 303-310 ◽  
Author(s):  
S.-H. Yi ◽  
S. Ahmed ◽  
Y. Watanabe ◽  
K. Watari
Keyword(s):  
Arsenic Removal ◽  
Membrane Surface ◽  
Membrane Process ◽  
Low Concentrations ◽  
Strong Shear ◽  
Low Levels ◽  
Removal Processes ◽  
Removal Of Arsenic ◽  
Concentration Polarization Layer ◽  
Chemical Sludge

Conventional arsenic removal processes have difficulty removing low concentrations of arsenic ion from water. Therefore, it is very hard to comply with stringent low levels of arsenic, such as below 10 μg/L. So, we have developed two arsenic removal processes which are able to comply with more stringent arsenic regulations. They are the MF membrane process combined with chemical sludge adsorption and NF membrane process equipped with the vibratory shear enhanced process (VSEP). In this paper, we examine the performance of these new processes for the removal of arsenic ion of a low concentration from water. We found that chemical sludge produced in the conventional rapid sand filtration plants can effectively remove As (V) ions of H2AsO4- and HAsO42- through anion exchange reaction. The removal efficiency of MF membrane process combined with chemical sludge adsorption increased to about 36%, compared to MF membrane alone. The strong shear force on the NF membrane surface produced by vibration on the VSEP causes the concentration polarization layer to thin through increased back transport velocity of particles. So, it can remove even dissolved constituents effectively. Therefore, As (V) ions such as H2AsO4- and HAsO42- can be removed. The concentration of As (V) ions decreased from 50 μg/L to below 10 μg/L and condensation factor in recirculating water increased up to 7 times by using NF membrane equipped with VSEP.

Arsenic Removal from Wastewater Using Adsorptive Mediums

2011 ◽  
Vol 189-193 ◽  
pp. 404-409
Author(s):  
Fu Quan Peng ◽  
Zhen Cheng Xu ◽  
Jian Hong Huang ◽  
Qing Wei Guo ◽  
Feng Nie
Keyword(s):  
Arsenic Removal ◽  
Removal Rate ◽  
National Standards ◽  
Ferrous Oxide ◽  
Anion Resin ◽  
Quartz Sands ◽  
Long Time ◽  
Removal Of Arsenic ◽  
Adsorptive Properties

Different adsorptive mediums and adsorbents’ compounds were chosen to remove arsenic from Yangzonghai Lake wastewater. Results showed that Ca(OH)2, attapulgite, bentonite, LDHs these adsorptive mediums had adsorptive capacities of less than 2.5 mg/g of As removal and it took long time for sediment before monitoring; adsorbents compounds’ results showed Fe2O3 and quartz sands had best removal rate and quartz sands had little removal of arsenic. Both strong anion resin and hydrated ferrous oxide-loaded on polystyrene diethanolamine resin(designated as PDR-HFO) can decrease As concentration to less than 0.01 mg/L reaching national standards for arsenic; anions such as SO42- can not be removed when strong anion resin was regenerated causing its loss of exchange ions; PDR-HFO exhibited excellent adsorptive properties and recyclability.

Polymer Supported Reagents: Efficient Method for Synthesis of Methylene Diesters

2010 ◽  
Vol 96 (3) ◽  
pp. 247-248 ◽  
Author(s):  
D. G. Salunkhe ◽  
M. H. Jagdale ◽  
M. M. Salunkhe ◽  
P. P. Wadgaonkar
Keyword(s):  
Efficient Method ◽  
Polymer Supported

Arsenic removal from groundwater by Anjili tree sawdust impregnated with ferric hydroxide and activated alumina

2015 ◽  
Vol 16 (1) ◽  
pp. 115-127 ◽  
Author(s):  
P. Dhanasekaran ◽  
P. M. Satya Sai ◽  
C. Anand Babu ◽  
R. Krishna Prabhu ◽  
K. K. Rajan
Keyword(s):  
Arsenic Removal ◽  
Heart Diseases ◽  
Ferric Hydroxide ◽  
Sorption Kinetics ◽  
Activated Alumina ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Freundlich Adsorption Isotherm ◽  
Pseudo Second Order ◽  
Removal Of Arsenic

Arsenic is a toxic element found naturally in groundwater. Due to its carcinogenicity, risk for heart diseases and diabetes, arsenic needs to be removed from groundwater for potable application. ‘Anjili’ tree sawdust was chemically modified with ferric hydroxide and activated alumina (SFAA) and used as an adsorbent for the removal of arsenic from groundwater. The adsorbent was characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) to study the pore structure and surface functional groups. Effect of contact time, initial concentration, pH, particle size and temperature was studied. Arsenic adsorbed by SFAA followed Freundlich adsorption isotherm. Maximum sorption of arsenic by SFAA adsorbent occurred at pH 6.5. Arsenic sorption kinetics followed a pseudo-second-order model. The maximum sorption capacity at 303 K was found to be 54.32 mg/g for As(III) and 77.60 mg/g for As(V). Interference of other ions on the adsorption was in the order of PO43− > SO42− > HCO3− > NO3−.

Pilot-Scale Performance of Iron and Arsenic Removal from Contaminated Groundwater

2005 ◽  
Vol 40 (1) ◽  
pp. 82-90 ◽  
Author(s):  
Biswaranjan Manna ◽  
Uday Chand Ghosh
Keyword(s):  
Arsenic Removal ◽  
Cost Effective ◽  
Pilot Scale ◽  
Cost Evaluation ◽  
Contaminated Groundwater ◽  
Arsenic Content ◽  
Hand Pump ◽  
Excess Iron ◽  
Tube Wells ◽  
Performance Results

Abstract Pilot-scale performance in reducing excess iron and arsenic from contaminated groundwater has been systematically reported. Here, a double column unit, the first packed with β-MnO2 and the second with crystalline FeOOH (goethite variety), with filters attached to the outlet of hand-pump tube-wells has been used in the field. Results showed that the filters generate 10,000 to 15,000 BV and 19,000 to 35,000 BV water with iron ≤ 0.3 mg/L and arsenic ≤10 µg/L from groundwater having influent iron and arsenic levels of 3.75 to 7.25 mg/L and 70 to 220 µg/L, respectively. The downflow rate of effluent water was 237.6 to 305.5 L/m2-min. The performance results were achieved with a single charging of the iron and arsenic removal media. Toxicity characteristic leaching procedure (TCLP) tests of the waste (arsenic content: 2.4 g/kg) showed that it is not hazardous to the environment and does not pose any risk to users. Cost evaluation showed $US0.50 to 0.70 per 1000 gallons of treated water and, hence, the technology is cost-effective for countries such as India and Bangladesh.

scholarly journals Electrochemical removal of nitrate from a Donnan dialysis waste stream

2019 ◽  
Vol 80 (4) ◽  
pp. 727-736 ◽  
Author(s):  
Judah Makover ◽  
David Hasson ◽  
Yunyan Huang ◽  
Raphael Semiat ◽  
Hilla Shemer
Keyword(s):  
High Salinity ◽  
Nitrate Removal ◽  
Waste Stream ◽  
Contaminated Groundwater ◽  
Nacl Solution ◽  
Promising Technique ◽  
Donnan Dialysis ◽  
Batch System ◽  
Anionic Composition ◽  
Electrochemical Removal

Abstract The objective of this work was to investigate electrochemical removal of nitrate from a high salinity waste stream generated by Donnan dialysis. Donnan dialysis for nitrate removal is a promising technique. It produces a distinctive composition of a high salinity waste stream of NaCl or Na2SO4 that requires a viable disposal method. The waste stream has the full anionic composition of contaminated groundwater, but the only cation is sodium. Experiments were conducted in a batch system setup. A copper cathode was chosen over brass, aluminum and graphite cathodes. A dimensionally stable anode (DSA), Ti/PbO2, was selected over a Ti/Pt anode. Electrochemical denitrification of high salinity Donnan dialysis nitrate wastes was successfully achieved, with different behavior exhibited in high salinity NaCl solution than in high salinity Na2SO4 solution. NaCl inhibited nitrate removal at high salinities while Na2SO4 did not. The maximum removals after 4 h operation in the high salinity wastes were 69 and 87% for the NaCl and Na2SO4 solutions respectively.

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