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Sulfide removal of current gas and liquid from anaerobic reactors applied to the treatment of acid mine drainage

Grant number: 10/51273-9
Support type:Research Grants - Research Partnership for Technological Innovation - PITE
Duration: November 01, 2011 - October 31, 2014
Field of knowledge:Engineering - Sanitary Engineering - Environmental Sanitation
Cooperation agreement: Vale-FAPEMIG-FAPESPA
Principal Investigator:Wiclef Dymurgo Marra Junior
Grantee:Wiclef Dymurgo Marra Junior
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Company: Vale S/A
City: São Carlos

Abstract

The acid mine drainage occurs when pyrite and other minerals containing sulfides are oxidized spontaneously due to the presence of oxygen and water, producing sulfuric acid that dissolves metals present in soil or rocks. This drainage can reach water bodies, affecting aquatic life and restricting the water consumption. Treatment of acid mine drainage by biological processes that involve reduction of sulfate has many advantages such as removing heavy metals, reducing costs of disposal of generated sludge and generating of alkalinity. However, the biological processes of sulfate reduction generate liquid and gaseous effluents with high concentration of sulfide. As a consequence, it is necessary to use units of post-treatment of gaseous and liquid phases, since the discharge of sulfide in gaseous or liquid streams is harmful to environment, biota and human health. The objective of this research are (1) to evaluate the removal of sulfide from the gaseous medium by adsorptive process, using anaerobic sludge as adsorbent and (2) the removal of sulfide from the liquid with conversion to elemental sulfur in micro-aerated reactors. (AU)