Tratamento físico, químico e biológico de lixiviado de aterro sanitário e vinhaça de cana-de-açúcar

Abstract

Leachate is a liquid by-product resulting from infiltration of rainwater and the biodegradation of waste deposited in landfills, it has a high concentration of ammoniacal nitrogen and recalcitrant organic matter. However, substances such as ammonia, present in high concentrations in the leachate, can cause negative effects on the environment. Considering the importance of searching for new treatment technologies for the leachate generated in landfills, this research evaluated the efficiency of the combined treatment of landfill leachate and sugarcane vinasse using physical, chemical and biological processes. , in a natural desorption reactor followed by a UASB reactor. The experimental system was installed and monitored in the physical premises of the Experimental Station for Biological Treatment of Sanitary Sewage (EXTRABES) of the State University of Paraíba, Campina Grande – PB, Brazil. The substrate used to feed the UASB reactor consisted of a mixture of sugarcane vinasse plus leached from a landfill in proportions that favored the formation of the substrate with an average concentration of N-NH4+ of 160 mg.L-¹. The natural desorption reactor showed an average efficiency in terms of N-NH4+ removal of 88%, without the need for the addition of chemical substances, making possible post-treatment of the leachate by biological means. The mean removal efficiency of total COD and soluble COD in the UASB reactor were 68% and 47.6% respectively.