Effects of water chemistry and flow rate on arsenate removal by adsorption to an iron oxide-based sorbent
Arsenate removal from water using an iron oxide-based sorbent was investigated to determine the optimal operating conditions and the influence of water composition on treatment efficiency. The novel sorbent with a high surface area was studied in flow-through column experiments conducted at differen...
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| Published in: | Water research (Oxford) Vol. 42; no. 18; pp. 4629 - 4636 |
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| Language: | English |
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01-11-2008
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| Abstract | Arsenate removal from water using an iron oxide-based sorbent was investigated to determine the optimal operating conditions and the influence of water composition on treatment efficiency. The novel sorbent with a high surface area was studied in flow-through column experiments conducted at different flow rates to quantify the effect of empty bed contact time (EBCT) on treatment performance. Arsenic removal efficiency declined with decreasing EBCT. Arsenic breakthrough curves at different EBCT values were successfully simulated with a pore and surface diffusion model (PSDM). Surface diffusion was the dominant intraparticle mass transfer process. The effect of water composition on arsenic removal efficiency was evaluated by conducting experiments with ultrapure water, ultrapure water with either phosphate or silica, and a synthetic groundwater that contained both phosphate and silica. Silica was more inhibitory than phosphate, and the silica in synthetic groundwater controlled the arsenic removal efficiency. |
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| AbstractList | Arsenate removal from water using an iron oxide-based sorbent was investigated to determine the optimal operating conditions and the influence of water composition on treatment efficiency. The novel sorbent with a high surface area was studied in flow-through column experiments conducted at different flow rates to quantify the effect of empty bed contact time (EBCT) on treatment performance. Arsenic removal efficiency declined with decreasing EBCT. Arsenic breakthrough curves at different EBCT values were successfully simulated with a pore and surface diffusion model (PSDM). Surface diffusion was the dominant intraparticle mass transfer process. The effect of water composition on arsenic removal efficiency was evaluated by conducting experiments with ultrapure water, ultrapure water with either phosphate or silica, and a synthetic groundwater that contained both phosphate and silica. Silica was more inhibitory than phosphate, and the silica in synthetic groundwater controlled the arsenic removal efficiency. Effects of water chemistry and flow rate on arsenate removal by adsorption to an iron oxide-based sorbent, were investigated. Arsenic (As) was a toxic and carcinogenic element. Consumption of arsenic-contaminated drinking water caused long-term health problems. Iron oxides were promising sorbent materials because they had strong chemical affinities for As and large specific surface areas. The adsorption of polymeric silica species occupied adsorption sites on the external surface of particles and blocked access to internal surfaces. The results showed that the adsorption density of arsenate increased with increasing dissolved arsenate. It was concluded that arsenic removal efficiency decreased as empty bed contact time (EBCT) decreased and flow rate increased. |
| Author | Arashiro, Maiko Giammar, Daniel E. Zeng, Hui |
| Author_xml | – sequence: 1 givenname: Hui surname: Zeng fullname: Zeng, Hui – sequence: 2 givenname: Maiko surname: Arashiro fullname: Arashiro, Maiko – sequence: 3 givenname: Daniel E. surname: Giammar fullname: Giammar, Daniel E. email: giammar@wustl.edu |
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| Keywords | Packed-bed column Drinking water treatment Iron oxide sorbent Arsenic Adsorption Pore and surface diffusion Model (PSDM) Phosphates Water treatment Packed bed Arsenates Treatment efficiency PSDM Modeling Pore and surface diffusion Model Mass transfer Operating conditions Sorbent Ultrapure water Packed column Breakthrough curve Ground water |
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Part II. 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| Snippet | Arsenate removal from water using an iron oxide-based sorbent was investigated to determine the optimal operating conditions and the influence of water... Effects of water chemistry and flow rate on arsenate removal by adsorption to an iron oxide-based sorbent, were investigated. Arsenic (As) was a toxic and... |
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| SubjectTerms | Adsorption Applied sciences arsenates Arsenates - chemistry Arsenates - isolation & purification Arsenic diffusion drinking water Drinking water treatment Exact sciences and technology Ferric Compounds - chemistry groundwater contamination hydrochemistry Iron oxide sorbent iron oxides optimization Other industrial wastes. Sewage sludge Packed-bed column pollutants Pollution Pore and surface diffusion Model (PSDM) Reproducibility of Results simulation models Wastes water flow Water Purification - methods water treatment Water treatment and pollution |
| Title | Effects of water chemistry and flow rate on arsenate removal by adsorption to an iron oxide-based sorbent |
| URI | https://dx.doi.org/10.1016/j.watres.2008.08.014 https://www.ncbi.nlm.nih.gov/pubmed/18786691 https://search.proquest.com/docview/14018202 https://search.proquest.com/docview/20038571 https://search.proquest.com/docview/69720362 |
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