Brazilian Journal of Chemical Engineering | |
Hydrolytic enzymes as coadjuvants in the anaerobic treatment of dairy wastewaters | |
M.c.m.r. Leal2  M.c. Cammarota1  D.m.g. Freire1  G.l. Sant’anna Jr.2  | |
[1] ,Universidade Federal do Rio de Janeiro COPPE Programa de Engenharia QuímicaRio de Janeiro RJ ,Brazil | |
关键词: dairy wastewater; enzymes; lipases; anaerobic treatment; enzymatic treatment; | |
DOI : 10.1590/S0104-66322002000200013 | |
来源: SciELO | |
【 摘 要 】
An enzymatic extract produced by Penicillium restrictum having a high level of lipase activity (17.2 U.g-1) was obtained by solid-state fermentation using babassu cake as substrate. The enzymatic extract was used in the hydrolysis of a dairy wastewater with high fat contents (180, 450, 900 and 1,200 mg.L-1). Different hydrolysis conditions were tested, and it was determined that it should be carried out at a temperature of 35ºC, without agitation, with 10% v/v enzymatic extract and a hydrolysis time of 12 hours. Both crude and hydrolysed effluents were then submitted to an anaerobic biological treatment. It was observed that for the enzymatically pretreated effluent there was a significant improvement in the efficiency of the anaerobic treatment. For the highest fat content tested (1,200 mg.L-1), removal efficiencies of 19 and 80% were attained for crude and hydrolysed effluents, respectively. In addition, a tenfold increase in the removal rate of COD from the hydrolysed effluent (1.87 kg COD.m-3.d-1) was observed in relation to the crude effluent (0.18 kg COD.m-3.d-1). The results obtained in this study illustrate the viability of using a hybrid treatment (enzymatic-biological) for wastewaters having high fat contents.
【 授权许可】
CC BY
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
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