【摘 要】
：
The wastewater after acid precipitation from papermaking black liquor has been treated by membrane of ultrafiltration,nanofiltration and reverse osmosis [1-6].During the experiment,the last mixed perm
【机 构】
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School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China
【出 处】
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The 6th International Conference on Separation and Technolog
论文部分内容阅读
The wastewater after acid precipitation from papermaking black liquor has been treated by membrane of ultrafiltration,nanofiltration and reverse osmosis [1-6].During the experiment,the last mixed permeate would be the stuff of next treatment.After each steps of membrane separation,the wastewaters (Chemical Oxygen Demand) CODcris measured [7].The change of flux,conductance and pH of mixed permeate would be studied simultaneously.The results show that the method of membrane treatment has good effects,as the last mixed permeate becomes colorless and transparent with no suspension.The membrane technology provides the 57.2%,90.7% and 97.9% removal rates respectively in CODcr leading to the CODcr of 24.0g·L-1、 5.2g·L-1 and 1.12 mg·L-1 in the permeate respectively.The stable value of pH was 3.99,at the same time; the conductance declined to 10.23ms/cm from 1.008ms/cm.
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