Arsenic removal from geothermal waters with zero-valent iron—Effect of temperature, phosphate and nitrate

Tyrovola, Konstantina; Nikolaidis, Nikolaos P.; Veranis, Nikolaos; Kallithrakas‐Kontos, N.; Koulouridakis, Pavlos

doi:10.1016/j.watres.2006.04.006

Cited by 109 publications

(59 citation statements)

References 22 publications

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“…Similar observations were also reported from other parts of the world, such as an aqueduct in Los Angeles, USA, where high As concentrations (mean: 0.02 mg/L) were sourced from the geothermal activity in the Long valley, Mono county [32]. Tyrovola et al [39] observed gradual decrease in As concentrations from the point of mixing of geothermal waters with shallow unconfined aquifers to the coastal area, approximately 7 km downstream. Such variations in As concentrations may relate to stratigraphy, depth of wells and redox status of the aquifer.…”

Section: Potential Consequences For Contamination Of Local Freshwatersupporting

confidence: 82%

Naturally occurring arsenic in terrestrial geothermal systems of western Anatolia, Turkey: Potential role in contamination of freshwater resources

Bundschuh

Maity

Nath

et al. 2013

Journal of Hazardous Materials

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h i g h l i g h t sPotential environmental impact of high arsenic from geothermal sources was identified. Geothermal waters from deep wells are characterized by Na-HCO 3 type. Hot spring fluids are characterized by Ca-HCO 3 type. As(III) is the dominant species in both deep wells and hot spring fluids. Mixing of geothermal waters containing As is responsible for environmental impact. Arsenic (As) contamination in terrestrial geothermal systems has been identified in many countries worldwide. Concentrations higher than 0.01 mg/L are detrimental to human health. We examined potential consequences for As contamination of freshwater resources based on hydrogeochemical investigations of geothermal waters in deep wells and hot springs collected from western Anatolia, Turkey. We analyzed samples for major ions and trace element concentrations. Temperature of geothermal waters in deep wells showed extreme ranges (40 and 230 • C), while, temperature of hot spring fluids was up to 90 • C. The Piper plot illustrated two dominant water types: Na-HCO 3 − type for geothermal waters in deep wells and Ca-HCO 3 − type for hot spring fluids. Arsenic concentration ranged from 0.03 to 1.5 mg/L. Dominance of reduced As species, i.e., As(III), was observed in our samples. The Eh value ranged between −250 and 119 mV, which suggests diverse geochemical conditions. Some of the measured trace elements were found above the World Health Organization guidelines and Turkish national safe drinking water limits. The variation in pH (range: 6.4-9.3) and As in geothermal waters suggest mixing with groundwater. Mixing of geothermal waters is primarily responsible for contamination of freshwater resources and making them unsuitable for drinking or irrigation.

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Section: Potential Consequences For Contamination Of Local Freshwatersupporting

confidence: 82%

Naturally occurring arsenic in terrestrial geothermal systems of western Anatolia, Turkey: Potential role in contamination of freshwater resources

Bundschuh

Maity

Nath

et al. 2013

Journal of Hazardous Materials

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“…Ions that compete with arsenic for adsorption sites on similar adsorbents include carbonate [27] , bicarbonate [28] , phosphate [12,[28][29][30][31] , silicate [28,[30][31] , and nitrate [12] . Interestingly, differences in concentrations of competing ions in water samples from diverse locations (i.e.…”

Section: Groundwater In Bangladesh Contains Ions That Likely Compete mentioning

confidence: 99%

“…Reviews of techniques to remove arsenic from water are presented by Ahmed [5] , Ng et al [6] , and Mohan and Pitman [7] . Successful arsenic removal techniques related to the work presented in this paper include removal with iron-oxide coated sand [8] or iron-impregnated sand [9] , direct adsorption on metallic (zero-valent) iron [10][11][12] , iron-chelated resins [13] , Fe 2+ -treated activated carbon [14] , magnetite nanocyrstals [15] , polymer beads coated with iron oxides [16] , granulated ferric hydroxide (GFH) [17][18] , and composite iron matrix [19] . Despite numerous methods for removing arsenic from drinking water, arsenic remediation is not widespread in Bangladesh, in part, because many of the existing techniques are cumbersome and/or not affordable to rural populations.…”

Section: Introductionmentioning

confidence: 99%

Arsenic remediation of drinking water using iron-oxide coated coal bottom ash

Mathieu

Gadgil

Addy

et al. 2010

Journal of Environmental Science and Health, Part A

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We describe laboratory and field results of a novel arsenic removal adsorbent called 'Arsenic Removal Using Bottom Ash' (ARUBA). ARUBA is prepared by coating particles of coal bottom l fired power plants, with iron (hydr)oxide. The coating process is * Address correspondence to Ashok Gadgil, Lawrence Berkeley National Laboratory, 1Cyclotron Rd MS 90R3058, Berkeley, CA 94720, USA; Phone: Email: ajgadgil@lbl.gov. 3 simple and conducted at room temperature and atmospheric pressure. Material costs for ARUBA are estimated to be low (~$0.08 per kg) and arsenic remediation with ARUBA has the potential to be affordable to resource-constrained communities. ARUBA is used for removing arsenic via a dispersal-and-removal process, and we envision that ARUBA would be used in community-scale water treatment centers. We show that ARUBA is able to reduce arsenic concentrations in This makes it easy to determine the amount of ARUBA required to treat a groundwater source when its arsenic concentration is known and less than 1600 ppb. Storing contaminated groundwater for two to three days before treatment is seen to significantly increase ARUBA's AAD. ARUBA can be separated from treated water by coagulation and clarification, which is expected to be less expensive than filtration of micron-scale particles, further contributing to the affordability of a community-scale water treatment center.

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“…Different technology have been identified to reduce arsenic concentrations in groundwater [9][10][11][12][13][14][15][16][17][18][19][20][21]. Coagulation with alum can be used to reduce arsenic concentrations to a certain level [22], and adsorption has been found to be effective in removing several metals in groundwater including arsenic while using less chemicals and generating less waste [11,12,15]. Iron oxides have been studied for their adsorption abilities [11,12,15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Hardness and pH on Adsorption Kinetic of Arsenate on Iron Oxide

Janjaroen¹,

Dilokdumkeng²,

Jhandrta³

2018

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Abstract. The adsorption of arsenate on iron oxide particles was studied as a function of pH and hardness concentrations. Morphology of the studied iron oxide surface was rough and irregular. The major chemical composition of iron oxide particles was Fe2O3 (96%). The optimal solution pH for adsorption was 8.0. The equilibrium of arsenic concentration was reached after 1 hour of contact time. The adsorption capacity (qe) increased with increasing iron oxide particles. Freundlich isotherm and pseudo-second order reaction were best descriptors of arsenate adsorption behavior. Calcium or magnesium concentrations did not significantly affect the adsorbed concentration of arsenic at equilibrium. However, arsenate adsorption was higher at low pH and decreased significantly with increasing pH.

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Arsenic removal from geothermal waters with zero-valent iron—Effect of temperature, phosphate and nitrate

Cited by 109 publications

References 22 publications

Naturally occurring arsenic in terrestrial geothermal systems of western Anatolia, Turkey: Potential role in contamination of freshwater resources

Naturally occurring arsenic in terrestrial geothermal systems of western Anatolia, Turkey: Potential role in contamination of freshwater resources

Arsenic remediation of drinking water using iron-oxide coated coal bottom ash

Effect of Water Hardness and pH on Adsorption Kinetic of Arsenate on Iron Oxide

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