超滤法处理桉木CTMP制浆废液的初步研究

Study on the Ultrafiltration of CTMP Effluents

采用截留相对分子质量为1000～30000的4种超滤膜对桉木CTMP制浆废液(包括化学预处理段及磨浆段)进行了超滤处理,找出了最佳处理效果的膜孔径,并用该孔径的膜对4种不同工艺的废液进行超滤处理,使废液的污染负荷大幅度降低,滤过液的生物可处理性明显提高。超滤浓缩液的固形物含量达到可蒸发、浓缩及烧却的要求。超滤膜清洗后,膜通量可恢复99%。

A laboratory scale ultrafiltrafion process for CTMP effluent was studied. In the Ultrafiltration process, four kinds of membranes with different molecular weight varying from 1000 to 30000it were used. A membrane with optimal molecular weight was found out after the expefirnont. Other four different kinds of CTMP effluents were treated with the optimal membrane. Experimental results indicated that after ultrafihration, the loading of pollution was reduced markedly; the heating value and solid content of the concentrated effluent were higher enough to meet the requirement of the conventional chemical recovery system. The flux of water through the membrane could be recovered by 99% after washing.