Mechanisms of manganese bioremediation by microbes: an overview

Abstract

Although an important micronutrient for many living organisms, manganese (Mn) can become a health and environmental problem at high concentrations. The element is usually found in wastewaters and drainages of different industrial sectors and its removal is notoriously difficult because of the high stability of the Mn (II) ion in aqueous solutions. The treatment of Mn-laden wastewaters may include microorganisms that catalyze Mn oxidation by either enzymatic or non-enzymatic pathways. In this context, this mini-review discusses the mechanisms by which fungi and bacteria promote Mn bioremediation.

Biosorption Characteristics of Mn (II) by Bacillus cereus Strain HM-5 Isolated from Soil Contaminated by Manganese Ore

“…Bacillus sp. has been identified as one of the best bacteria based on former research [51]. B. cereus, as an Mn-oxidizing and -reducing microorganism, was isolated from biofilms in chlorinated drinking water systems [52].…”

“…Mechanisms of Mn bioremediation by microbes have been reviewed [51]. Biosorption and biomineralization are the main two methods in the context of metal removal by microorganisms.…”

Biological manganese removal from mine drainage in a fixed-bed bioreactor at pilot-scale

“…The most widespread passive manganese treatments for mine drainage, such as oxic rock filters (Tan et al 2010) or the patented pyrolusite process (Vail & Riley 2000), use microorganisms to improve manganese oxidation rate without increasing pH up to 10. Many different microorganisms can remove manganese from water by oxidising it as a precipitate through a wide variety of pathways (Barboza et al 2016).…”

Characterization of Manganese Oxide-Biomineralization by the Psychrophilic Marine Bacterium, Arthrobactersp. Strain NI-2 and Its Spontaneous Mutant Strain NI-2'

“…In water ecosystem, Mn(II) found as Mn 2+ ions are further oxidized for the formation of Mn(III/ IV) oxides mainly by the activity of micro-organisms, because the rates of Mn(II)-oxidation catalyzed by microorganisms are much faster than that of the abiotic Mn(II) oxidation (Nealson et al, 1988;Tebo et al, 2004). The biogenic Mn oxides formation system, i.e., Mn oxide-biomineralization, could be a good tool for Mn removal from industrial wastewater (Barboza et al, 2016;Ike et al, 2011). Moreover, metal scavenger property of Mn oxides could be an additional tool for multiple heavy-metal removal for industrial wastewater (Figure 2, Chemisorption).…”