Study of effect of rate of recirculation in upflow aerobic-anaerobic combined fixed bed reactor for organic matter and nutrients removal from dairy plant wastewater

• Grant number: 12/17669-8
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): November 01, 2012
• Effective date (End): October 31, 2013
• Field of knowledge: Engineering - Sanitary Engineering - Water Supply and Wastewater Treatment
• Principal Investigator: Rogers Ribeiro
• Grantee: Tiago Ramos Leite da Silva
• Host Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil

Abstract

The increase in the production of processed foods in order to meet the global food demand has generated a considerable increase in waste production, which depend on the type of product processed at the site, as well as form processing. Issuing process without waste remains to be implemented on the basis of this condition, it is indispensable the use of processes for treating solid waste, gaseous or liquid. A good option to treating wastewater generated by food industry is the use of biological reactors, due to the characteristics of most organic constituents of these wastewaters. The biological treatment of wastewater are based on the joint action of microorganisms of different species different compounds which metabolize nutrients and energy extracting them, resulting in the stabilization of organic matter present in the wastewater. Nitrogen compounds released into the environment by human activity causing pollution, the greenhouse effect and stimulate threaten biodiversity. The biological nitrogen removal by nitrification and denitrification processes is an integral part of the tertiary treatment of effluent and has been widely used. However, the recent development of these processes has approached innovative concepts such as the use of reactors that occur in the processes of nitrification and denitrification simultaneously, providing the design of treatment systems more compact. Currently, the effluent of the Dairy School USP Pirassununga are treated in a water treatment plant equipped with experimental box fat separation, then the equalization tank and tank pH adjustment. In this sense, this research project proposes to study the combined anaerobic-aerobic reactor aiming at total nitrogen removal through nitrification and denitrification simultaneously under different rates of effluent recirculation. (AU)