ANAEROBIC EFFLUENT DISINFECTED WITH OZONE/HYDROGEN PEROXIDE
Authors
Gustavo Henrique Ribeiro da Silva
Universidade Estadual Paulista "Julio de Mesquita Filho"
Luiz Antonio Daniel
Departamento de Hidráulica e Saneamento da Escola de Engenharia de São Carlos - USP.
Ronan Cleber Contrera
Departamento de Engenharia Hidráulica e Ambiental (PHD), Escola Politécnica (EP) - USP
Harry Bruning
Wageningen University
Abstract
This research aimed at studying the oxidation process, to verify the effectiveness of coliform inactivation and to evaluate the formation of ozonation disinfection byproducts (DBP) in anoxic sanitary wastewater treated with ozone/hydrogen peroxide applied at doses of 2.6 mg O3 L-1 and 2.0 mg H2O2 L-1 with contact time of 10 min and 8.1 mg O3 L-1 and 8.0 mg H2O2 L-1 with contact time of 20 min. The mean chemical oxygen demand (COD) reductions were 7.50 and 9.40% for applied dosages of 2.5 - 2.8 and 6.4 - 9.4 mg O3 L-1 + 2.0 and 8.0 mg H2O2.L-1, respectively. The Escherichia coli (E. coli) inactivation range was 2.98 - 4.04 log10 and the total coliform inactivation range was 2.77 - 4.01 log10. The aldehydes investigated were formaldehyde, acetaldehyde, glyoxal and methylglyoxal. It was observed only the formation of acetaldehyde that ranged 5.53 to 29.68 µg L-1.
Keywords: Ozone, hydrogen peroxide, disinfection, byproducts, sanitary wastewater, anaerobic effluent.
Author Biographies
Gustavo Henrique Ribeiro da Silva, Universidade Estadual Paulista "Julio de Mesquita Filho"
Professor Assistente Doutor do Departamento de Engenharia Civil da Faculdade de Engenharia de Bauru, UNESP
Luiz Antonio Daniel, Departamento de Hidráulica e Saneamento da Escola de Engenharia de São Carlos - USP.
Professor Doutor do Departamento de Hidráulica e Saneamento da Escola de Engenharia de São Carlos - USP.
Ronan Cleber Contrera, Departamento de Engenharia Hidráulica e Ambiental (PHD), Escola Politécnica (EP) - USP
Professor Assistente Doutor do Departamento de Engenharia Hidráulica e Ambiental (PHD), Escola Politécnica (EP) - USP
Harry Bruning, Wageningen University
Professor Doutor do Sub-Department of Environmental Technology - Wageningen University