Biological Nitrification of Waste Water.

ABSTRACT

Nitrification has been studied extensively as a result of its significance within the biological process and at intervals the necessity for treatment of waste water. In the last decade, the treatment of high ammonical concentration effluents has become a matter of nice interest. Many effluents will contain some hundred milligrams of nitrogen per liter (supernatants from anaerobic digestion, lechates from municipal water, etc.) may have specific treatment before utilization them to the plant recycling process. Sometimes this reaction is applied by maintaining robust ammonical concentrations which have the role of inhibiting the nitrite – oxidizing population responsible for the reaction of nitrites into nitrates (final stage of nitrification). However the nitrification methods served as a very important basis for the development of today understands and mathematical models for several waste treatment processes (activated sludge process using biofilm reactors) and self – purification in rivers. Often nitrogen removal from sea wastewater is problematic due to the low rate of bacteria concerned. Immobilization is an economical technique to retain slow growing organisms in continuous flow reactors. Immobilized cells can be classified into “naturally” attached cells (biofilms) and “artificially” immobilized cells. The simultaneous nitrification and denitrification within the step feeding biological nitrogen removal method were investigated below different inflowing substrate and aeration flow rates. The experimental results showed that there was additionally linear relationship between simultaneous nitrification and denitrification and DO concentration below the conditions of low and high aeration rate.