Centro de Investigação em Engenharia dos Processos Químicos e Produtos da Floresta, GERSE, Group on Environmental, Reaction and Separation Engineering, Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, Pólo II-Rua Silvio Lima, 3030-790 Coimbra, Portugal.
Environ Technol. 2011 Jul;32(9-10):1031-41. doi: 10.1080/09593330.2010.523439.
Ozonation, catalytic ozonation, Fenton's and heterogeneous Fenton-like processes were investigated as possible pretreatments of a low biodegradable and highly toxic wastewater produced by a detergent industry. The presence of a Mn-Ce-O catalyst in ozonation enhances the biodegradability and improves the degradation at low pH values. However, a high content of carbonyl compounds adsorbed on the recovered solid indicates some limitations for real-scale application. A commercial Fe2O3-MnOx catalyst shows higher activity as well as higher stability concerning carbon adsorption, but the leaching of metals is larger than for Mn-Ce-O. Regarding the heterogeneous Fenton-like route with an Fe-Ce-O catalyst, even though a high activity and stability are attained, the intermediates are less biodegradable than the original compounds, indicating that the resulting effluent cannot be conducted to an activated sludge post-treatment. The highest enhancement of effluent biodegradability is obtained with the classic homogeneous Fenton's process, with the BOD5/COD ratio increasing from 0.32 to 0.80. This process was scaled up and the treated effluent is now safely directed to a municipal wastewater treatment plant.
臭氧氧化、催化臭氧氧化、芬顿法和非均相类芬顿法被研究作为一种低生物降解性和高毒性洗涤剂工业废水的预处理方法。在臭氧氧化中存在 Mn-Ce-O 催化剂可以提高生物降解性并改善低 pH 值下的降解。然而，在回收的固体上吸附的大量羰基化合物表明该方法在实际应用中存在一些局限性。一种商业的 Fe2O3-MnOx 催化剂表现出更高的活性和稳定性，同时在碳吸附方面的稳定性也更高，但是金属浸出量大于 Mn-Ce-O。对于采用 Fe-Ce-O 催化剂的非均相类芬顿法，尽管达到了较高的活性和稳定性，但中间体的生物降解性不如原始化合物，表明所得的出水不能直接进行活性污泥后处理。经典的均相芬顿法可获得出水生物降解性的最大提高，BOD5/COD 比值从 0.32 增加到 0.80。该过程已被放大，处理后的废水现在可安全地排入城市污水处理厂。
