Phenolic wastewaters depuration and biodegradability enhancement by ozone over active catalysts

作者：Martins Rui C; Quinta Ferreira Rosa M^*

来源：Desalination, 2011, 270(1-3): 90-97.

DOI：10.1016/j.desal.2010.11.026

• Biodegradability
• Heterogeneous catalysis
• Ozonation
• Phenolic wastewaters
• Toxicity

Catalytic and non-catalytic ozonations were investigated in the depuration of simulated phenolic wastewaters. Commercial (N-150: Fe-Mn-O) and laboratory-made (Mn-Ce-O 70/30) catalysts have been used to improve the effluent biodegradability. The N-150 catalytic system followed a free radical pathway detected by means of the application of radical scavengers. After 120 min of reaction, the recovered N-150 catalyst showed low carbon adsorption and negligible leaching behaviour. Moreover, the catalyst remained active after various feed-batch trials. Mn-Ce-O 70/30 led to higher mineralization levels and stronger biodegradable characteristics of the final solution measured by respirometry. Nevertheless, a lower BOD(5)/COD ratio of the treated effluent as well as a higher ecological impact measured by bio-luminescence techniques was detected. Further application of the N-150 catalyst seems to be preferable to enhance ozone action although its activity can be limited by the presence of radical scavengers in real effluents.

• 出版日期2011-4-1