Arsenic removal from contaminated water by ultrafine δ-FeOOH adsorbents

2014 ◽  
Vol 237 ◽  
pp. 47-54 ◽  
Author(s):  
Márcia C.S. Faria ◽  
Renedy S. Rosemberg ◽  
Cleide A. Bomfeti ◽  
Douglas S. Monteiro ◽  
Fernando Barbosa ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Contaminated Water

scholarly journals Evaluation of modified montmorillonite with di-cationic surfactants as efficient and environmentally friendly adsorbents for arsenic removal from contaminated water

2017 ◽  
Vol 18 (2) ◽  
pp. 460-472 ◽  
Author(s):  
E. Shokri ◽  
R. Yegani ◽  
B. Pourabbas ◽  
B. Ghofrani
Keyword(s):  
Contact Time ◽  
Arsenic Removal ◽  
Environmentally Friendly ◽  
Contaminated Water ◽  
X Ray Diffraction ◽  
Solution Ph ◽  
Modified Montmorillonite ◽  
Adsorption Capacities ◽  
Modified Adsorbents ◽  
Adsorption Desorption

Abstract In this work, montmorillonite (Mt) was modified by environmentally friendly arginine (Arg) and lysine (Lys) amino acids with di-cationic groups for arsenic removal from contaminated water. The modified Mts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential and thermal analysis. The adsorption of As(V) onto modified Mts as a function of initial As(V) concentration, contact time and solution pH was investigated. The removal efficiency was increased with increasing the As(V) concentration and contact time; however, it was decreased with increasing solution pH. The maximum As(V) adsorption capacities of Mt-Arg and Mt-Lys were 11.5 and 11 mg/g, respectively, which were five times larger than pristine Mt. The high adsorption capacity makes them promising candidates for arsenic removal from contaminated water. The regeneration studies were carried out up to 10 cycles for both modified Mts. The obtained results confirmed that the modified adsorbents could also be effectively used for As(V) removal from water for multiple adsorption – desorption cycles.

Lake Restoration of Arsenic Pollution by Manganese Ore

2013 ◽  
Vol 726-731 ◽  
pp. 1659-1663
Author(s):  
Ning Xin Chen ◽  
Yong Bing Huang ◽  
Jing Dong
Keyword(s):  
Removal Efficiency ◽  
Adsorption Process ◽  
Arsenic Removal ◽  
Freundlich Isotherm ◽  
Order Reaction ◽  
Contaminated Water ◽  
Manganese Ore ◽  
Arsenic Pollution ◽  
First Order ◽  
Acidic Conditions

Using manganese ore coated with small stones to adsorb arsenic from the contaminated water samples of Yangzonghai Lake, and several factors that may have impacts on the arsenic removal efficiency are analyzed. The result shows that the new adsorbent material has a great effect on arsenic removal. Temperature's effect on arsenic removal efficiency is not obvious. The arsenic removal efficiency increased dramatically in accordance with residence time within 0-660s, and then stabilized. The adsorption process is better when conducted in acidic conditions, the maximum adsorption rate reached 83.0% with the pH of 3.0 and it reached the minimum value of 14.7% when pH is 10. Fe3+ and Ca2+ can slightly promote manganese ore's adsorption of arsenic, and with anions CO32-, SiO32- , efficiency was slightly reduced. When fitting the kinetics data of arsenic removal by coated manganese ore, the adsorption process is correspondent with first-order reaction kinetics model. The adsorption isotherm is more close to the Freundlich isotherm model.

scholarly journals Arsenic removal from arsenic-contaminated water by biological arsenite oxidation and chemical ferrous iron oxidation using a down-flow hanging sponge reactor

2017 ◽  
Vol 17 (5) ◽  
pp. 1249-1259 ◽  
Author(s):  
Nao Kamei-Ishikawa ◽  
Nami Segawa ◽  
Daisuke Yamazaki ◽  
Ayumi Ito ◽  
Teruyuki Umita
Keyword(s):  
Arsenic Removal ◽  
Low Cost ◽  
Iron Hydroxide ◽  
Iron Oxidation ◽  
Quality Standards ◽  
Small Scale ◽  
Contaminated Water ◽  
Water Quality Standards ◽  
Ferrous Iron Oxidation ◽  
Arsenite Oxidizing Bacteria

The down-flow hanging sponge (DHS) reactor was used for continuous As removal treatment of As-contaminated water. The treatment scheme was: (1) As(III) in contaminated water is oxidized by arsenite-oxidizing bacteria fixed in the sponges in the reactor; (2) Fe(II) naturally existing in the water is oxidized by dissolved oxygen; (3) Fe(III) is precipitated as iron hydroxide and As(V) is co-precipitated with the iron hydroxide; and finally (4) the co-precipitates are fixed in the sponges. This system could remove As from As-contaminated water on a small scale and at low cost. The results showed that, after using the DHS reactor, As and Fe concentrations in the treated water were lower than water quality standards for drinking water when Fe(II) concentration in the influent was lower than 10 mg/L and the Fe/As ratio was higher than 6.67–8.42, with dependence on the Fe concentration. Additionally, even if Fe concentration is higher than 10 mg/L, the treatment system is still applicable if the pH of the influent is higher than 7 or the retention time is longer than 2 h.

Size-controlled synthesis of uniform akaganeite nanorods and their encapsulation in alginate microbeads for arsenic removal

RSC Advances ◽  
2014 ◽  
Vol 4 (42) ◽  
pp. 21777-21781 ◽  
Author(s):  
Kihun Cho ◽  
Bom Yi Shin ◽  
Hyung Keun Park ◽  
Bong Guen Cha ◽  
Jaeyun Kim
Keyword(s):  
Arsenic Removal ◽  
Contaminated Water ◽  
Controlled Synthesis ◽  
Size Controlled

Alginate microbeads encapsulating the uniform akaganeite nanorods were used for quick, easy arsenic removal from highly contaminated water.

Polyelectrolyte-Enhanced Ultrafiltration (PEUF) Process for Low Level Arsenic Removal: Recovery of Polyelectrolyte from Retentate Stream

2012 ◽  
Vol 506 ◽  
pp. 27-30 ◽  
Author(s):  
P. Pookrod ◽  
W. Dungkaew ◽  
P. Un-Arn ◽  
K.J. Haller
Keyword(s):  
Arsenic Removal ◽  
Concentration Level ◽  
Divalent Cations ◽  
Cationic Polyelectrolyte ◽  
Molar Ratio ◽  
Contaminated Water ◽  
Process Technology ◽  
Low Level ◽  
Low Levels ◽  
Size And Morphology

Removal of low levels of arsenic from contaminated water using the polyelectrolyte-enhanced ultrafiltration or PEUF process technology has been studied. The cationic polyelectrolyte poly (diallyldimethyl ammonium chloride), PDADMAC, was utilized to bind arsenic (in the form of arsenate anion) in contaminated water and the polyelectrolyte-arsenate complex solution was then filtered off (as retentate) by ultrafiltration. The 99-99.9% arsenic removal from synthetic low level arsenic (100 ppb) contaminated water demonstrates that the technology can easily achieve the relatively new international arsenic maximum concentration level of 10 ppb. To make the PEUF process more economical and environmentally friendly, the PDADMAC in the retentate must be recovered. Precipitation of PDADMAC-arsenate solutions with divalent cations has been studied to separate out metal-arsenate compounds leaving free PDADMAC to reuse in the process. The metal-arsenate compound precipitation is strongly affected by divalent metal:As molar ratio, and pH of the solution. The precipitation results also suggest that polyelectrolyte retards formation of the metal-arsenate compounds and affects the size and morphology of the particles formed, thus directly affecting the sedimentation rate of the resulting precipitate.

scholarly journals Arsenic Removal from Contaminated Water Using Natural Adsorbents: A Review

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1407
Author(s):  
Kanfolo Franck Herve YEO ◽  
Chaokun Li ◽  
Hui Zhang ◽  
Jin Chen ◽  
Wendong Wang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Ion Exchange ◽  
Flow Rate ◽  
Contact Time ◽  
Arsenic Removal ◽  
Polluted Water ◽  
Contaminated Water ◽  
Natural Materials ◽  
The Past ◽  
Natural Adsorbents

More than 170 million individuals have been influenced by arsenic (As) because of the ingestion of As-polluted groundwater. The presence of As in water bodies, particularly groundwater, has been found to become a widespread issue in the past few decades. Because arsenic causes extreme wellbeing impacts, even at a low concentration in drinking water, the innovations of As removal from contaminated water are of significant importance. Traditional strategies, for example, reverse osmosis, ion exchange, and electro-dialysis are generally utilized for the remediation of As-polluted water; however, the high cost and/or sludge production restricts their application in less-developed areas. The utilization of adsorbents acquired from natural materials has been explored as an alternative for the costly techniques for As removal. This paper aims to review the past and current developments in using naturals adsorbents or modified natural materials for arsenic removal and show the different parameters, which may influence the As removal effectiveness of the natural adsorbent, such as contact time, adsorbent dosage, flow rate, pH, reusability, temperature, and influence of others ions.

scholarly journals Assessment of Aspergillus niger Strain’s Suitability for Arsenate-Contaminated Water Treatment and Adsorbent Recycling via Bioextraction in a Laboratory-Scale Experiment

2020 ◽  
Vol 8 (11) ◽  
pp. 1668
Author(s):  
Eva Duborská ◽  
Kinga Szabó ◽  
Marek Bujdoš ◽  
Hana Vojtková ◽  
Pavol Littera ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Arsenic Removal ◽  
Culture Media ◽  
Arsenic Concentration ◽  
Contaminated Water ◽  
Biotechnology Research ◽  
Cultivation Period ◽  
Ferric Oxyhydroxide ◽  
The Common ◽  
Scale Experiment

In this work, the viability of bioaccumulation and bioextraction processes for arsenic removal from contaminated waters, as well as the recycling of arsenate-treated amorphous ferric oxyhydroxide adsorbent (FeOOH) were evaluated using the common soil microscopic filamentous fungus Aspergillus niger. After treating the contaminated arsenate solution (100 mg As L−1) with FeOOH, the remaining solution was exposed to the growing fungus during a static 19-day cultivation period to further decrease the arsenic concentration. Our data indicated that although the FeOOH adsorbent is suitable for arsenate removal with up to 84% removal efficiency, the fungus was capable of accumulating only up to 13.2% of the remaining arsenic from the culture media. This shows that the fungus A. niger, although highly praised for its application in environmental biotechnology research, was insufficient for decreasing the arsenic contamination to an environmentally acceptable level. However, the bioextraction of arsenic from arsenate-treated FeOOH proved relatively effective for reuse of the adsorbent. Due to its production of acidic metabolites, which decreased pH below 2.7, the fungal strain was capable of removing of up to 98.2% of arsenic from the arsenate-treated FeOOH adsorbent.

Arsenic Removal from Contaminated Water Using the CaO–SiO2–FeO Glassy Phase in Steelmaking Slag

2016 ◽  
Vol 3 (3) ◽  
pp. 470-485 ◽  
Author(s):  
Hiroki Yoshida ◽  
Xu Gao ◽  
Shohei Koizumi ◽  
Sun-joong Kim ◽  
Shigeru Ueda ◽  
...  
Keyword(s):  
Glassy Phase ◽  
Arsenic Removal ◽  
Contaminated Water ◽  
Steelmaking Slag

scholarly journals The Influence of Dosing Modes of Coagulate on Arsenic Removal

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Zhibin Zhang ◽  
Jinxiang Li ◽  
Cuizhen Sun ◽  
Yanhao Zhang ◽  
Lilong Huang ◽  
...  
Keyword(s):  
Particle Size ◽  
Arsenic Removal ◽  
Arsenic Speciation ◽  
Contaminated Water ◽  
Distribution Analysis ◽  
Hydrous Oxides ◽  
Stretching Vibration ◽  
Ft Ir ◽  
Single Dosing ◽  
High Arsenic

Three different dosing modes, including one single dosing mode and two sequential dosing modes, were applied in high-arsenic contaminated water treatment. The results illustrated that the As (V) soluble and the As (V) nonspecifically sorbed were the insignificant species from Fe-As (V) samples in the sequential dosing mode, while they were higher in the single dosing mode. However, it could be further concluded that the mobility of the Fe-As (V) in sequential dosing mode was greater than that in single dosing mode. Besides, the main arsenic speciation governing the arsenic-borne coagulates was the As (V) associated with poorly crystalline hydrous oxides of Fe in sequential or single dosing mode. Moreover, the particle size distribution analysis indicated that the sequential dosing mode was more prevalent in neutralizing and adsorbing the As (V) compared with the single dosing mode. In the FT-IR spectra, the presence of arsenic was highlighted by a well resolved band at 825–829 cm−1. The positions of the As–O stretching vibration bands were shifted gradually as the dosing mode changed from the single to the sequential. This result could be related to the distribution of arsenic speciation in different dosing modes.

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