Evaluating Arsenic and Manganese Removal From Water by Chlorine Oxidation Followed by Clarification

Abstract

-This paper investigates the simultaneous removal of arsenic [As(V) or As(III)] and manganese [Mn(II)] from natural waters of low and high turbidity by clarification (with polyaluminum chloride and aluminum sulfate as primary coagulants) associated or not with chlorine pre-oxidation. The results showed that the clarification process exhibited low Mn(II) removal, that varied from 6% to 18% and from 19% to 27% for natural waters of low and high turbidity, respectively. The use of chlorine as pre-oxidant increased Mn(II) removal up to 77% and was associated with the formation of birnessite. Regarding As(V) removal by clarification, particularly for high turbidity water, a concentration lower than that established by the National Drinking Water Quality Standards (10 µg.L-1) was achieved in almost all tests. Oxidation preceding the clarification led to AsIII removal efficiencies from 80% to 90% for both coagulants and types of water.

The Simultaneous Removal of Ammonium and Manganese from Surface Water in South China by Manganese Co-Oxide Film

“…Conventionally, break-point chlorination [ 5 ], the stripping method, ion exchange [ 6 , 7 ], and biological methods [ 8 , 9 ] are used to get rid of NH 4 + -N; while pre-oxidation with strong oxidants combined with coagulation, precipitation, and filtration processes [ 10 ] are mainly used to remove Mn 2+ . However, for the raw water with NH 4 + -N and manganese coexisting, Huang and others found a new way to remove the two pollutants simultaneously in a previous study [ 11 , 12 ].…”

Simultaneous Removal of Arsenic and Manganese from Synthetic Aqueous Solutions Using Polymer Gel Composites

“…Although As and Mn have been removed separately or exclusively [7,8], their simultaneous adsorption has not been conducted to date. Two previous studies have reported the removal of As, Mn, and Fe [6,9] and one study developed a treatment system using coagulation and filtration for the simultaneous removal of As and Mn [10].…”

In situ X-ray absorption spectroscopic studies of photocatalytic oxidation of As(III) to less toxic As(V) by TiO2 nanotubes

“…in wastewater could be decreased by coagulation with iron and aluminium salts; nevertheless, this has suffered from relatively low effectiveness and additional hazardous sludge to be treated (Ló pez-Muñ oz et al, 2017;Lata & Samadder, 2016). Pre-oxidation of As(III) to As(V) may facilitate the coagulation (Pires et al, 2015). Chlorine, sodium hypochlorite, chlorine dioxide, ozone, hydrogen peroxide, permanganate (or manganese dioxide) and Fenton's reagents were frequently used in the oxidation of As(III) in wastewater (Ebrahiem et al, 2017;Butnariu et al, 2019).…”