Fraga Maria C, Sanches Sandra, Crespo João G, Pereira Vanessa J
REQUIMTE/LAQV, Department of Chemistry, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.
Instituto de Biologia Experimental e Tecnológica, Apartado 12, 2781-901 Oeiras, Portugal.
Membranes (Basel). 2017 Feb 27;7(1):12. doi: 10.3390/membranes7010012.
Extremely high removals of total suspended solids and oil and grease were obtained when olive mill wastewaters were filtered using new silicon carbide tubular membranes. These new membranes were used at constant permeate flux to treat real olive mill wastewaters at pilot scale. The filtration conditions were evaluated and optimized in terms of the selection of the permeate flux and flux maintenance strategies employed-backpulsing and backwashing-in order to reduce fouling formation. The results obtained reveal that the combination of backpulses and backwashes helps to maintain the permeate flux, avoids transmembrane pressure increase and decreases the cake resistance. Moreover, membrane cleaning procedures were compared and the main agents responsible for fouling formation identified. Results also show that, under total recirculation, despite an increased concentration of pollutants in the feed stream, the quality of the permeate is maintained. Membrane filtration using silicon carbide membranes is an effective alternative to dissolved air flotation and can be applied efficiently to remove total suspended solids and oil and grease from olive mill wastewaters.
使用新型碳化硅管状膜过滤橄榄榨油厂废水时，总悬浮固体以及油脂的去除率极高。这些新型膜在恒定渗透通量下用于中试规模处理实际的橄榄榨油厂废水。根据渗透通量的选择以及所采用的通量维持策略（反脉冲和反冲洗）对过滤条件进行了评估和优化，以减少污垢形成。所得结果表明，反脉冲和反冲洗相结合有助于维持渗透通量，避免跨膜压力升高并降低滤饼阻力。此外，对膜清洗程序进行了比较，并确定了造成污垢形成的主要因素。结果还表明，在全循环条件下，尽管进料流中污染物浓度增加，但渗透液的质量仍能保持。使用碳化硅膜进行膜过滤是替代溶解气浮的有效方法，可有效用于去除橄榄榨油厂废水中的总悬浮固体以及油脂。
