Remoção de metais pesados de água residuária da suinocultura com o uso de farinha de osso em coluna de leito fixo

Abstract

One of the main problems found in wastewater of pig farming is the presence of heavy metals, like zinc and copper,which are added to pig feed in order to prevent diseases and improve digestion. This project wants to evaluate the possibility of using bovine bone for remove the heavy metals present in pig farming wastewater, in fixed bed column. The experiment was performed in a bench scale at the Federal Technological University of Parana – Campus Campo Mourão. The wastewater used was from a pig farm, and for its characterization, analysis of Ph, total solids, fixed and volatile, DQO, nitrogen, calcium, copper and zinc were realized. The bone meal was purshased in a local floriculture, and in its characterization were determined parameters of: pH, moisture content, total organic matter, total organic carbon, ash content, calcium, copper and zinc. The fixed bed column used in the experiment was made up of a glass reactor with downward flow of 2,5 mL/min for eight hours. Every 25 ml of percolated percolated was obtained a sample. It wasn’t observed ion exchange of metals with the calcium present in the constitution of bone meal, possibly occurring only physical adsorption in the pores of the biosorbent material. After the passage of ARS in adsorption bed, the concentrations of Cu and Zn started to suit the realease patterns in a receiving body laid down in CONAMA Resolution, Nº430 from 2011. The biosorbent showed an average removal of 86.90% for the metal copper and 80.21% for zinc removal. It was not possible to determine the breakthrough curves of the bed because no biosorbent saturation occurred during the time of experiment considered. The results demonstrated that bone meal has the potential to be used as biosorbents in the removal of heavy metals in different wastewaters.