Wastewater \'CD POT.2+\' and \'CU POT.2+\' removal using a continuous Anaerobic Bioreactor with Fixed-Structured Bed

Author(s)

Gustavo Mockaitis

• Document type: Doctoral Thesis
• Press: São Carlos.
• Institution: Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD)
• Defense date: 2011-03-21

Examining board members

Marcelo Zaiat; Ana Claudia Barana; Carlos Augusto de Lemos Chernicharo; Mario Takayuki Kato; Willibaldo Schmidell Netto

• Advisor: Marcelo Zaiat; José Alberto Domingues Rodrigues

Abstract

This work presents the anaerobic continuous bioreactor with fixed-structured bed as a viable configuration of treatment of wastewater containing \'CU POT.2+\' and \'CD POT.2+\' ions. Each metallic ion were studied separately. The bioreactor was operated with 12 to 15 hours of hydraulic retention time, with a synthetic wastewater simulating domestic sewage (500 mg \'0 IND.2\'/L, in COD terms), at 30°C. In methanogenic conditions, the bioreactor was fed with crescent amount of \'CU POT.2+\' and \'CD POT.2+\'. The metal accumulation in the irnrnobilization matrix caused instability on bioreactor when achieving the critical concentrations for \'CU POT.2+\' (50,8 mg \'CU POT.2+\'/L) and for \'CD POT.2+\' (29,8 mg \'CD POT.2+\'/L). Also it was observed that this crescent metal concentration affected the efficiency of bioreactor in removing organic matter, although without operational instability until the system reach these critical metal concentrations. The bioreactor was operated in sulfidogenic conditions fed with a wastewater containing \'CU POT.2+\' and \'CD POT.2+\' at critical concentrations considering two different COD/[\'SO IND.4\'POT.2-\'] (0,68 and 1,99 for a mean influent \'CU POT.2+\' concentration of 36 mg \'CU POT.2+\'/L; and 0,69 and 8,02 para for a mean influent \'CD POT.2+\' concentration of 27 mg \'CD POT.2+\'/L). During the sulfidogenic conditions operations the bioreactor operated showing stability, however the system was not able to achieve the maximum efficiency in metal removal. (AU)

• FAPESP's process: 07/07574-1 - Removal of Cd2+ and Cu2+ from Wastewaters Using Continuous Anaerobic Bioreactor of Non-Random Fixed Bed
• Grantee: Gustavo Mockaitis
• Support Opportunities: Scholarships in Brazil - Doctorate