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Arsenate removal from drinking water using by-products from conventional iron oxyhydroxides production as adsorbents coupled with submerged microfiltration unit
Citation Link: https://doi.org/10.15480/882.2760
Publikationstyp
Journal Article
Date Issued
2021-11
Sprache
English
TORE-DOI
TORE-URI
Volume
28
Issue
42
Start Page
59063
End Page
59075
Citation
Environmental Science and Pollution Research 28 (42): 59063–59075 (2021-11)
Publisher DOI
Scopus ID
Publisher
Springer Verlag
© 2020, The Author(s). Arsenic is among the major drinking water contaminants affecting populations in many countries because it causes serious health problems on long-term exposure. Two low-cost micro-sized iron oxyhydroxide-based adsorbents (which are by-products of the industrial production process of granular adsorbents), namely, micro granular ferric hydroxide (μGFH) and micro tetravalent manganese feroxyhyte (μTMF), were applied in batch adsorption kinetic tests and submerged microfiltration membrane adsorption hybrid system (SMAHS) to remove pentavalent arsenic (As(V)) from modeled drinking water. The adsorbents media were characterized in terms of iron content, BET surface area, pore volume, and particle size. The results of adsorption kinetics show that initial adsorption rate of As(V) by μTMF is faster than μGFH. The SMAHS results revealed that hydraulic residence time of As(V) in the slurry reactor plays a critical role. At longer residence time, the achieved adsorption capacities at As(V) permeate concentration of 10 μg/L (WHO guideline value) are 0.95 and 1.04 μg/mg for μGFH and μTMF, respectively. At shorter residence time of ~ 3 h, μTMF was able to treat 1.4 times more volumes of arsenic-polluted water than μGFH under the optimized experimental conditions due to its fast kinetic behavior. The outcomes of this study confirm that micro-sized iron oyxhydroxides, by-products of conventional adsorbent production processes, can successfully be employed in the proposed hybrid water treatment system to achieve drinking water guideline value for arsenic, without considerable fouling of the porous membrane.
Subjects
Adsorption kinetics
Arsenic removal
Drinking water production
Granular ferric hydroxide
Micro-sized iron oxyhydroxides
Submerged membrane adsorption hybrid system
Waste utilization
DDC Class
540: Chemie
600: Technik
620: Ingenieurwissenschaften
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