TESTING CONDITIONS FOR THE GROWTH OF NITRIFYING BACTERIA ISOLATED AT COLLEGE OF AGRICULTURE AND FORESTRY – THAI NGUYEN UNIVERSITY

Abstract

The nitrogen redundancy in wastewater is one of reasons causing harmful effects to water environment, threating the sustainable development and diversity of aquatic communities. The clean-up of nitrogen in wastewater occurs in nature by the combination of two processes – nitrification and denitrification. Nitrification is the transformation of nitrogen compound to nitrite, the process converting nitrite to nitrogen is called denitrification. The aim of this research was to isolate some microorganism strains with nitrification ability in some pollutant areas at Thai Nguyen University of Agriculture and Forestry using Winogradsky medium. Four bacteria strains showing nitrification ability were isolated. Optimal pH and temperature for growth of those strains were 8 and 30^oC, respectively. Morphology and biochemical activities shown that selected strains might belong to genera Nitrosomonas and Nitrobacter. More researches need to be carried out to identify species taxonomy and establish the bioremediation process for removing nitrogen in wastewater.