Formation of manganese phosphate and manganese carbonate during long-term sorption of Mn²⁺by viable Shewanella putrefaciens: effects of contact time and temperature

Abstract

The influence of temperature (5, 10, 22 and 30 C) on the long-term (30 days) sorption of Mn 2+ by viable Shewanella putrefaciens was studied by FTIR and EXAFS. The additional Mn-removal capacity of these bacteria was found to result from the surface precipitation of Mn-containing inorganic phases. The chemical composition of the Mn-containing precipitates is temperature and contact-time dependent.Mn(II) phosphate and Mn(II) carbonate were the two major precipitates formed in 1000 mL batches at 10, Environmental impactThe data shown in this work demonstrate that viable S. putrefaciens (and most likely some other microorganisms) has a great potential to stabilise (or reduce the mobility in the environment of) Mn 2+ (and most likely some other metal ions) through processes occurring at the interfaces of the cells for at least 30 days. The interfacial processes start from ion exchange/surface complexation and continue with biomineralisation. Composition of bioprecipitates is a function of temperature, metal loading and bacterial density. The results presented demonstrate that the role of microorganisms in formation of natural minerals might be even greater than thought preciously.

Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

“…Specific morphologies of Mn-oxides have been described that are similar to the present observations [57]. Precipitation of Mn(II)-phosphate in cultures of Shewanella putrefaciens has been reported, as well [58]. Noteworthy, Mn-bearing phases have been characterized by EXAFS at the oxic-anoxic boundary of the eutrophic Lake Sempach (Switzerland) [59].…”

Study of diversity of mineral-forming bacteria in sabkha mats and sediments of mangrove forest in Qatar

“…This finding adds to the previous reports, including the study by Chubar et al. (2015) [38] , which demonstrated that Shewanella putrefaciens can mediate the formation of both manganese phosphate and manganese carbonate. Bacteria possess diverse mechanisms to actively influence and induce mineral formation [39] .…”

Phosphorus mobility under short-term anoxic conditions in two shallow eutrophic coastal systems (Curonian and Sacca di Goro lagoons)

“…It seems likely that reactive Mn reduction was involved in H 2 S reoxidation which prevented further effluxes in the bottom water. Moreover, we can speculate that low Mn 2+ concentration in deeper sediment can be due to precipitation by sulfides or absorption by carbonates favored by the increment of pore water alkalinity induced by high sulfate reduction rates (Lovley and Phillips, 1988;Giordani et al, 1997;Chubar et al, 2015).…”