Mobility and redox transformation of arsenic during treatment of artificially recharged groundwater for drinking water production

Autor: Fabienne Battaglia-Brunet, Arslan Ahmad, Prosun Bhattacharya, Wim A. Oorthuizen, Albert van der Wal, Leo Heijnen, Brent Pieterse, Luuk de Waal
Přispěvatelé: Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Environmental Engineering
0208 environmental biotechnology
chemistry.chemical_element
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
02 engineering and technology
010501 environmental sciences
01 natural sciences
Chloride
Ferric Compounds
Slow sand filter
Arsenic
Water Purification
chemistry.chemical_compound
Rapid sand filter
medicine
Drinking water
Waste Management and Disposal
Effluent
Groundwater
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Water Science and Technology
Civil and Structural Engineering
WIMEK
Fe(III)(oxyhydr)oxides
Ecological Modeling
Drinking Water
Silicon Dioxide
Pollution
6. Clean water
020801 environmental engineering
Potassium permanganate
chemistry
[SDU]Sciences of the Universe [physics]
Environmental chemistry
Rapid sand filtration
Environmental Technology
Ferric
Milieutechnologie
Water treatment
Oxidation-Reduction
Co-precipitation
Filtration
Water Pollutants
Chemical
medicine.drug
Zdroj: Water Research
Water Research, IWA Publishing, 2020, 178, pp.115826. ⟨10.1016/j.watres.2020.115826⟩
Water Research 178 (2020)
Water Research, 178
ISSN: 0043-1354
Popis: In this study we investigate opportunities for reducing arsenic (As) to low levels, below 1 μg/L in produced drinking water from artificially infiltrated groundwater. We observe that rapid sand filtration is the most important treatment step for the oxidation and removal of As at water treatment plants which use artificially recharged groundwater as source. Removal of As is mainly due to As co-precipitation with Fe(III)(oxyhydr)oxides, which shows higher efficiency in rapid sand filter beds compared to aeration and supernatant storage. This is due to an accelerated oxidation of As(III) to As(V) in the filter bed which may be caused by the manganese oxides and/or As(III) oxidizing bacteria, as both are found in the coating of rapid sand filter media grains by chemical analysis and taxonomic profiling of the bacterial communities. Arsenic removal does not take place in treatment steps such as granular activated carbon filtration, ultrafiltration or slow sand filtration, due to a lack of hydrolyzing iron in their influent and a lack of adsorption affinity between As and the filtration surfaces. Further, we found that As reduction to below 1 μg/L can be effectively achieved at water treatment plants either by treating the influent of rapid sand filters by dosing potassium permanganate in combination with ferric chloride or by treating the effluent of rapid sand filters with ferric chloride dosing only. Finally, we observe that reducing the pH is an effective measure for increasing As co-precipitation with Fe(III)(oxyhydr)oxides, but only when the oxidized arsenic, As(V), is the predominant species in water.
Databáze: OpenAIRE
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