Removal of Arsenic and Coliform Bacteria by Modified Sand Filter With Slag and Zeolite from Drinking Water

Abstract

Background: Among the various adverse pollutants in water, coliform bacteria and arsenic are very important. Drinking of arseniccontaminated water has become a serious threat to public health and has affected millions of people across the world. Objectives: The aim of this study was to investigate the removal of arsenic and coliform bacteria from drinking water in small communities with the use of a conventional Slow Sand Filter (SSF) and modified filter by slag (SMF) and Zeolite (ZMF). Methods: In this study, initial concentrations of arsenic were 0.073, 0.11, 0.171, 0.21, 0.24, and 0.33 mg/l and the initial number of coliform bacteria was 4*10 6 MPN/100 mL. Arsenic and coliform bacteria samples were taken every 24 and 48 hours, respectively.

Recent advances in the science and technology of natural zeolites in Iran

“…The As 3+ removal, coliform bacteria removal, mean turbidity removal, electrical conductivity reduction efficiencies and cation-exchange capacity of the adsorbents tested decreased in the following order: SMF > ZMF > SSF. However, the mean total hardness removal efficiency showed the following order: ZMF > SMF > SSF (Abdolahnejad et al , 2014, 2017). In another study, zeolite-based Raschig ring adsorbents with optimal physical strength and sorption capacity for removal of Pb 2+ from aqueous solution were prepared using 47.5 wt.% cement kiln dust, 32.5 wt.% zeolite and 20.0 wt.% bentonite (Salem et al , 2012).…”

Eliminating heavy metals from water with filters packed with natural zeolite of varying sizes

“…2021, Instituto Mexicano de Tecnología del AguaOpen Access bajo la licencia CC BY-NC-SA 4.0 (https://creativecommons.org/licenses/by-nc-sa/4.0/) 308 Tecnología y ciencias del agua,ISSN 2007ISSN -2422, 282-327. DOI: 10.24850/j-tyca-2021-06-07 inverse osmosis(Abejon, Garea, & Irabien, 2015), among others Abdolahnejad, Jafari, Ebrahimi, Mohammadi, and Farrokhzadeh (2017). evaluated different types of filters to remove As among them a zeolite treatment with a particle size of 0.15-0.35 mm and a density of 1 538.4 kg m -3 .…”