Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Application of heterogeneous catalytic ozonation as a tertiary treatment of effluent of biologically treated tannery wastewater
The present study employed a Mn-Cu/Al 2 O 3 heterogeneous catalytic ozonation process for tertiary treatment of actual tannery wastewater, focusing on its feasibility in that application. The primary factors affecting the removal efficiency of organic pollutants were investigated, including catalyst dosage, ozone dosage, and initial pH value. The experimental results showed that the addition of a Mn-Cu/Al 2 O 3 catalyst improved the removal efficiency of chemical oxygen demand (COD) during ozonation, which initiated a 29.3% increase for COD removal, compared to ozonation alone after 60 min. The optimum pH, catalyst dosage, and ozone dosage were determined to be 7.0, 2.0 g/L, and 0.3 g/h, respectively. Under these conditions, following 60 min of reaction, the COD removal efficiency and the concentration in effluent were 88%, and 17 mg/L, respectively. In addition, the presence of tert-butanol (a well known hydroxyl radical scavenger) strongly inhibited COD removal via Mn-Cu/Al 2 O 3 catalytic ozonation, indicating that the Mn-Cu/Al 2 O 3 catalytic ozonation process follows a hydroxyl radical (OH·) reaction mechanism. The Mn-Cu/Al 2 O 3 catalyst exhibited good stability and reusability. Finally, the kinetic analysis revealed that the apparent reaction rate constant of COD removal with the Mn-Cu/Al 2 O 3 catalytic ozonation system (0.0328 min −1 ) was 2.3 times that of an ozonation system alone (0.0141 min −1 ). These results demonstrated that the catalytic ozonation using Mn-Cu/Al 2 O 3 is an effective and promising process for tertiary treatment of tannery effluent in biological systems.
Application of heterogeneous catalytic ozonation as a tertiary treatment of effluent of biologically treated tannery wastewater
The present study employed a Mn-Cu/Al 2 O 3 heterogeneous catalytic ozonation process for tertiary treatment of actual tannery wastewater, focusing on its feasibility in that application. The primary factors affecting the removal efficiency of organic pollutants were investigated, including catalyst dosage, ozone dosage, and initial pH value. The experimental results showed that the addition of a Mn-Cu/Al 2 O 3 catalyst improved the removal efficiency of chemical oxygen demand (COD) during ozonation, which initiated a 29.3% increase for COD removal, compared to ozonation alone after 60 min. The optimum pH, catalyst dosage, and ozone dosage were determined to be 7.0, 2.0 g/L, and 0.3 g/h, respectively. Under these conditions, following 60 min of reaction, the COD removal efficiency and the concentration in effluent were 88%, and 17 mg/L, respectively. In addition, the presence of tert-butanol (a well known hydroxyl radical scavenger) strongly inhibited COD removal via Mn-Cu/Al 2 O 3 catalytic ozonation, indicating that the Mn-Cu/Al 2 O 3 catalytic ozonation process follows a hydroxyl radical (OH·) reaction mechanism. The Mn-Cu/Al 2 O 3 catalyst exhibited good stability and reusability. Finally, the kinetic analysis revealed that the apparent reaction rate constant of COD removal with the Mn-Cu/Al 2 O 3 catalytic ozonation system (0.0328 min −1 ) was 2.3 times that of an ozonation system alone (0.0141 min −1 ). These results demonstrated that the catalytic ozonation using Mn-Cu/Al 2 O 3 is an effective and promising process for tertiary treatment of tannery effluent in biological systems.
Application of heterogeneous catalytic ozonation as a tertiary treatment of effluent of biologically treated tannery wastewater
Huang, Guangdao (Autor:in) / Pan, Feng / Fan, Guofeng / Liu, Guoguang
2016
Aufsatz (Zeitschrift)
Englisch
USA , Recht , Zeitschrift , Datenverarbeitung
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