Jos é M. Cerrato and Andrea M. Dietrich: Department of Civil and Environmental Engineering Joseph O. Falkinham III: Department of Biological Sciences . Impact of Chemical and Microbiological Oxidation and Reduction of Manganese in Drinking Water Systems.
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José M. Cerrato and Andrea M. Dietrich: Department of Civil and Environmental Engineering
Joseph O. Falkinham III: Department of Biological Sciences
Impact of Chemical and Microbiological Oxidation and Reduction of Manganese in Drinking Water Systems
418 Durham Hall Environmental and Water Resources Engineering Virginia Tech
Worldwide, corrosion of drinking water pipes and build-up of scales on the interior pipe wall impacts both the quality and quantity of water delivered to consumers. This research investigated the role of chemical and microbiological factors on pipe corrosion and manganese oxidation and reduction in drinking water supply systems. Severe manganese contamination was reported in Tegucigalpa, Honduras. Consumers constantly complain of receiving “black water” at their taps and for this reason the city was selected for this research. Two water plants from Virginia that perform Mn removal were also selected for this study. Results of this study indicate that control of both microbial and chemical processes are important to limiting corrosion and that pipe type (PVC vs. iron) will influence scaling, biofilm growth, and water quality.
Figure1. Chemical and microbiological factors affecting manganese oxidation and reduction in drinking water systems.
Materials and Methods
Figures 6a and 6b. PVC and Iron pipes collected from
the distribution system in Honduras.
Figures 2a and 2b. Particulate manganese retained in a 0.45 m membrane and in a water sample.
Table 1. Obtained concentrations of water quality parameters in Honduras
1 B.D.L. = Below Detection Limit 2 N.A. = Not Analyzed
Figure 3. Manganese cycle in the dinking water system of Tegucigalpa, Honduras.
Figure 4. Isolates recovered from the different locations at the drinking water treatment and distribution system.
Figures 7a and 7b. Mn-oxidizing bacteria grown in
Mn-oxidizing selective agar and broth media.
National Science Foundation
NSF Grant # DMII0329474
Figures 5a and 5b. Assessment for Mn –oxidation and –reduction of biofilm suspensions obtained from Honduras.