NITRITATION STUDY OF THE ANAEROBIC REJECT WATER

Abstract: A considerable progress has been achieved in nitrogen removal from high nitrogen containing wastewaters such as anaerobic sludge digester and reactor effluents, livestock breeding wastewaters, fertilizer industry wastwaters, and landfill leachates as short-cut biological nitrogen removal over nitrite (nitritation-denitritation) and partial nitritation coupled to anaerobic ammonium oxidation (Anammox) which have been implemented at real-scale wastewater treatment plants (WWTPs) in western countries. Low organic carbon level limits total nitrogen removal from these wastewaters and requires spesific operational conditions. Many works in literature have been investigating partial ammonium oxidaton to nitrite/nitritation to produce a suitable influent for Anammox process and simultaneous nitritation and denitritation. Nitritation reaction has been carried out by ammonium oxidizing bacteria (AOB)(Nitrosomonas spp.) and nitrite oxidation to nitrate by nitrite oxidizing bacteria (NOB) have to be imparted in order to achieve an economic degree. High-nitrogen containing anaerobic reject water produced in municipal WWTPs is recycled via internal flow to the main line where it causes several operational problems such as reduced performance in the biological treatment unit and worsened final effluent. This study investigated a comparative evaluation of nitritation form anaerobic reject water and synthetic wastewater in paralel sequential batch reactors.