Journal of Environmental Biology

Sulfide-based mixotrophic denitrification for treatment of sulfur, nitrogen and carbon-contaminated wastewater

Li Wei¹, Liang Xiao², Liu Lei¹ and Lin Jianguo^1*

¹College of Environmental Science and Engineering, Dalian Maritime University, Dalian-116026, China

²College of Transportation Equipment and Ocean Engineering, Dalian Maritime University, Dalian-116026, China

^*Corresponding Author?s Email : weiwei99231@126.com

Publication Data

Paper received:

08 June 2014

Revised received:

30 September 2014

Re-revised received:

01 January 2015

Accepted:

07 February 2015

Abstract

Wastewater contaminated by sulfur, nitrogen and carbon compounds was treated by sulfide-based denitrification process in an expanded granular sludge bed packed with porous sponge. In influent, nitrate and nitrite served as electron acceptors, while sulfide and organic carbon served as electron donors. Both sulfide-based autotrophic denitrification and heterotrophic denitrification were found in the bioreactor. The percentage of heterotrophic denitrification was 36.5%, and the removal rates of sulfide, nitrate, nitrite and organic carbon were 99%, 99%, 95.5% and 80% respectively, which actualized the simultaneous mixotrophic denitrification and desulfurization. The effect factors such as organic carbon category, organic carbon loading rate and nitrite loading rate were also investigated. The 50mgCl^-1d^-1 of glucose and 25mgCl^-1 d^-1 acetate sodium were found good for sulfide-based denitrification, while the suitable loading rate of nitrite was 50mgNl^-1d^-1.     

 Key words

Denitrification, Desulfurization, Mixotrophic, Nitrite, Organic carbon

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