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Response of nitrifying bacterial communities to the increased thiocyanate concentration in pre-denitrification process

TitleResponse of nitrifying bacterial communities to the increased thiocyanate concentration in pre-denitrification process
Publication TypeJournal Article
Year of Publication2011
AuthorsKim YMo, Cho HUk, Lee DSung, Park C, Park D, Park JMoon
JournalBioresouce Technology
Volume102
Issue2
Start Page913
Pagination913-922
Date Published01/2011
KeywordsInternal recycling ratio, Nitrifying bacteria, Pre-denitrification process, Thiocyanate, Total nitrogen
Abstract

Changes in process performance and the nitrifying bacterial community associated with an increase of thiocyanate (SCN-) loading were investigated in a pre-denitrification process treating industrial wastewater. The increased SCN- loading led to the concentration of total nitrogen (TN) in the final effluent, but increasing the internal recycling ratio as an operation parameter from 2 to 5 resulted in a 21% increase in TN removal efficiency. In the aerobic reactor, we found that the Nitrosomonas europaea lineage was the predominant ammonia oxidizing bacteria (AOB) and the percentages of the AOB population within the total bacteria increased from about 4.0% to 17% with increased SCN- concentration. The increase of nitrite loading seemed to change the balance between Nitrospira and Nitrobacter, resulting in the high dominance of Nitrospira over Nitrobacter. Meanwhile, a Thiobacillus thioparus was suggested to be the main microorganism responsible for the SCN- biodegradation observed in the system.

DOI10.1016/j.biortech.2010.09.032