Biofilm Accelerates As(III) Oxidation on Reactive MnOx Coated Filter Sand in Groundwater Filters.

ABSTRACT: Removal of carcinogenic arsenic (As) from groundwater is essential for providing safe drinking water. Arsenate (As-(V)) is more effectively removed in groundwater filters than arsenite (As-(III)), making the oxidation of As-(III) to As-(V) a key step in the treatment process. This study distinguishes between surface-catalytic and biological As-(III) oxidation on natural manganese oxide (MnO _x ) coated filter sand, since it is unknown which pathway dominates in filters. The MnO _x coated sand was collected from a full-scale groundwater filter and consisted of a mixture of different abiotically and biologically formed Mn oxides, such as Birnessite and Todorokite. A lab-scale filter setup was operated with As-(III)-containing water. Within 3 weeks, a shift f

SUBMITTER: Goedhart R 

PROVIDER: S-EPMC12706773 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature