Arsenate removal from drinking water using by-products from conventional iron oxyhydroxides production as adsorbents cou
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INNOVATIONS IN WATER AND WASTEWATER TREATMENT
Arsenate removal from drinking water using by-products from conventional iron oxyhydroxides production as adsorbents coupled with submerged microfiltration unit Muhammad Usman 1 & Ioannis Katsoyiannis 2 & Josma Henna Rodrigues 1 & Mathias Ernst 1 Received: 6 January 2020 / Accepted: 4 March 2020 # The Author(s) 2020
Abstract 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. Keywords Arsenic removal . Granular ferric hydroxide . Micro-sized iron oxyhydroxides . Waste utilization . Adsorption kinetics . Submerged membrane adsorption hybrid system . Drinking water production
Introduction Groundwater is globally the foremost source of drinking water for human consumption. Arsenic contamination of drinking Responsible Editor: Bingcai Pan * Muhammad Usman [email protected] * Mathias Ernst [email protected] 1
Institute for Water Resources and Water Supply, Hamburg University of Technology, Am Schwarzenberg-Campus 3, 20173 Hamburg, Germany
2
Department of Chemistry, Laboratory of Chemical and Environmental Technology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
waters across the world is one of the most serious water related problems, because it affects big parts of the global population and it is very harmful to human health. It is well-known that inorganic forms of arsenic are a strong human carcinogen. The World Health Organization (WHO) has set a guideline value of 10 μg/L in drinking water. Both natu
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