Alternativa de tratamiento de lixiviados de rellenos sanitarios en plantas de aguas residuales urbanas

Abstract

In this study an alternative is presented for the disposal and treatment of leachates generated in stage IV of the Bordo Poniente Landfill. The alternative treatment involves facultative lagoons located in Texcoco Lake, which is 1.5 km from the site of leachate generation. Because such systems function with the help of algae, the growth and evolution of the microorganisms responsible for the treatment such as the algae Microsistis sp., Merismopedia sp., Euglena sp., Scenedesmus sp., Chlorella and Diatomeas, were tracked, as were levels of fecal coliform matter and heavy metals. The results show that it is viable to incorporate 10% leachate mixed with wastewater into facultative lagoons, and the result is a 71% removal efficiency of Biological Oxygen Demand (BOD). It was demonstrated that mixing stable leachates with young leachates increases the wastewater plant´s removal efficiency by raising the level of organic material in the leachate-wastewater mixture. This was done through the treatment of 90 mg/L without altering the algal population.