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Sustainable membrane-based process for valorisation of cork boiling wastewaters

机译：基于膜的可持续工艺，用于软木塞沸腾废水的增值

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摘要

Cork boiling wastewaters were processed by nanofiltration(NF)in order to concentrate phenolic compounds,whose tanning power allows their application in the leather tanning process as a retanning agent,and to produce a permeate suitable for reuse in the cork boiling operation,according to the International Code of Cork Stopper Manufacturing Practice.Four commercial polymeric membranes were selected and tested at laboratory scale:NTR7450,Desal-DK,NF90 and NF270.The feed volume reduction factor(VRF)was defined to be equal to seven or higher,and the operation was carried out in a batch mode at 15 bar and 25 °C.The performance of the different membranes was evaluated determining membrane permeability and rejection coefficients for several pollutant indicators:total organic carbon(TOC),colour,absorbance at 254 nm and salt content.Two membranes were selected to perform pilot-scale studies,NF270 and NF90,based on their performance in this process.The results obtained in the laboratory and pilot-scale studies permitted the development of a mass balance model,which was calibrated with experimental data.Additionally,a technical and economical evaluation study was performed,which showed that the process proposed in this work is viable for industrial application.
机译：通过纳滤（NF）处理软木塞沸腾废水，以浓缩酚类化合物，其鞣制能力使其可以用作鞣革剂在皮革鞣制过程中使用，并根据软木塞沸腾产生适合于再利用的渗透液。国际软木塞制造规程。选择了四种商用聚合物膜并在实验室规模下进行了测试：NTR7450，Desal-DK，NF90和NF270。进料体积减少系数（VRF）等于或大于7，并且在15 bar和25°C下以分批模式进行操作。评估了不同膜的性能，确定了几种污染物指标的膜渗透性和截留系数：总有机碳（TOC），颜色，254 nm吸光度和盐分根据其在该过程中的性能，选择了两种膜进行NF270和NF90的中试研究。 t规模研究允许开发质量平衡模型，并用实验数据进行了校准。此外，还进行了技术和经济评估研究，表明该工作中提出的方法对于工业应用是可行的。

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