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Autotrophic Nitrite Denitrification Using Sulfur Particles for Treatment of Wastewaters with Low C/N Ratios (Batch Tests)  

Yoon, Seung-Joon (Department of Civil and Environmental System Engineering, Hanyang University)
Kang, Woo-Chang (Department of Biological Environment, Kangwon National University)
Bae, Woo-Keun (Department of Civil and Environmental System Engineering, Hanyang University)
Oh, Sang-Eun (Department of Biological Environment, Kangwon National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.9, 2010 , pp. 851-856 More about this Journal
Abstract
A sulfur utilizing nitrite denitrification process could be placed after the shortcut biological nitrogen removal (SBNR) process. In this study, removal of nitrite using sulfur oxidizing denitrifier was characterized in batch tests with granular elemental sulfur as an electron donor and nitrite as an electro acceptor. At sufficient alkalinity, initial nitrite nitrogen concentration of 100 mg/L was almost completely reduced in the batch reactor within a incubation time of 22 h. Sulfate production with nitrite was 4.8 g ${SO_4}^{2-}/g$ ${NO_2}^-$-N, while with nitrate 13.5 g ${SO_4}^{2-}/g$ ${NO_3}^-$-N. Under the conditions of low alkalinity, nitrite removal was over 95% but 15 h of a lag phase was shown. For nitrate with low alkalinity, no denitrification occurred. Sulfate production was 2.6 g ${SO_4}^{2-}/g$ ${NO_2}^-$-N and alkalinity consumption was 1.2 g $CaCO_3/g$ ${NO_2}^-$. The concentration range of organics used in this experiment did not inhibit autotrophic denitrification at both low and high alkalinity. This kind of method may solve the problems of autotrophic nitrate denitrification, i.e. high sulfate production and alkalinity deficiency, to some extent.
Keywords
Autotrophic Denitrification; Nitrite Shortcut Process; Sulfur Particles; Sulfur Utilizing Bacteria;
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