High-Performance Catalytic Wet Oxidation of Excess Activated Sludge Derived from Pharmaceutical Wastewater Treatment Process over a Cu/γ-Al2O3 Catalyst

The performance of catalytic wet oxidation of excess activated sludge derived from pharmaceutical wastewater treatment over a Cu/gamma-Al2O3 catalyst was investigated. The experiments were performed with a stainless steel autoclave reactor by using the prepared Cu/gamma-Al2O3 catalyst. The effects of reaction conditions were examined, including additional catalyst amount, reaction temperature, time, and initial oxygen pressure. Results demonstrated that the catalyst, fabricated via co-precipitating method, has excellent catalytic performance. Through the study on condition optimization, the highest removal rates of volatile suspended solids (VSS, 93.6%) and total chemical oxygen demand (TCOD, 76.5%) were acquired with the reaction temperature 260 degrees C, time 60 min, initial oxygen pressure 1.0 MPa, and the prepared catalyst 5.0 g/L. The volatile fatty acids (VFAs) produced from the wet oxidation of sludge included acetic (mainly), propanoic, isobutyric, and isovaleric acids, which have great potential for the utilization as organic carbon sources in biological wastewater treatment plant. These results demonstrated that the proposed method, catalytic wet oxidation over Cu/gamma-Al2O3 catalyst, is effective for treating excess activated sludge and resource utilization of organic carbon in the sludge.

Automated summary

In this study, the catalytic wet oxidation of excess activated sludge derived from pharmaceutical wastewater treatment was investigated using a Cu/gamma-Al2O3 catalyst. The results demonstrated that the catalyst, fabricated via co-precipitating method, exhibited excellent catalytic performance. The highest removal rates of volatile suspended solids (VSS) and total chemical oxygen demand (TCOD) were achieved through condition optimization, and the volatile fatty acids (VFAs) produced from the wet oxidation of sludge showed great potential for resource utilization in biological wastewater treatment.