Details

Autor(en) / Beteiligte

• Zhao, Jian-Fu
• Chen, Ling
• Lu, Yi-Cheng
• Tang, Wen-Wei

Titel

Catalytic wet air oxidation for the treatment of emulsifying wastewater

Ist Teil von

• Journal of environmental sciences (China), 2005, Vol.17 (4), p.576-579

Ort / Verlag

Netherlands: State Key Laboratory of Pollution Control and Resource Reuses, Tongji University, Shanghai 200092, China%Department of Water and Wastewater Design, Shanghai Municipal Engineering Design Institute, Shanghai 200092, China

Erscheinungsjahr

2005

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• The wet air oxidation (WAO) and catalytic WAO(CWAO) of the high strength emulsifying wastewater containing nonionic surfactants have been investigated in terms of COD and TOC removal. The WAO and homogeneous CWAO processes were carried out at the temperature from 433 K to 513 K, with initial oxygen pressure 1.2 MPa. It was found that homogeneous catalyst copper(Cu(NO3)2) had an fairly good catalytic activity for the WAO process, and the oxidation was catalyzed when the temperature was higher than 473K. Moreover, several heterogeneous catalysts were proved to be effective for the WAO process. At the temperature 473 K, after 2h reaction, WAO process could achieve about 75% COD removal and 66% TOC removal, while catalysts Cu/Al2O3 and Mn-Ce/Al2O3 elevated the COD removal up to 86%-89% and that of TOC up to 82%. However, complete elimination of COD and TOC was proved to be difficult even the best non-noble catalyst was used. Therefore, the effluent from WAO or CWAO process need to be further disposed. The bioassay proved that the effluent from WAO process was amenable to the biochemical method.