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http://dx.doi.org/10.4491/KSEE.2013.35.9.675

Biological Perchlorate Reduction in Municipal Sewage  

Choi, Hyeoksun (Department of Civil and Environmental Engineering, Wonkwang University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.35, no.9, 2013 , pp. 675-680 More about this Journal
Abstract
This research was done to evaluate the potential for destruction of perchlorate in municipal sewage. Laboratory experiments were conducted in flasks containing 3 liters of raw sewage. Sewage was mixed with defined amount of perchlorate and various additives. Perchlorate reduction in sewage did occur, but was quite variable, ranging from 0 to 72% over 72 hour. Addition of even a small amount of perchlorate acclimated biomass (167 mg/L SS) significantly reduced the lag and resulted in complete perchlorate removal. Perchlorate reduction in sewage-brine mixtures was inhibited when the dissolved oxygen level was greater than 2 mg/L, and when the mixture salinity was relatively high (conductivity = 14 mS with equivalent TDS = 8 g/L). When nitrate ($NO_3{^-}$) was present with perchlorate in the laboratory flask tests of sewage-brine mixtures, nitrate reduction proceeded first. A significant amount of nitrite ($NO_2{^-}$) accumulated in the sewage-brine mixtures, accounting for about 66% of initial nitrate nitrogen ($NO_3$-N).
Keywords
Perchlorate; Nitrate; Sewage; Brine;
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