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Application of ultrafiltration in the pulp and paper industry: metals removal and Whitewater reuse

机译:超滤在纸浆和造纸工业中的应用:金属去除和白水再利用

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In the pulp and paper industry, the water use minimization is a constant target. One way to reduce water use is to recycle the effluent in a closed-cycle concept. In paper mills, the main source of liquid effluent is the so-called Whitewater, which is the excess water, originated from pulp stock dewatering and other fibre contaminated water. This research studied the reuse of paper mill Whitewater after membrane ultrafiltration (UF) in the paper machine and in the pulp bleach plant of an integrated mill. Contaminant removal and flux behaviour of the UF system were evaluated. The treatment by ultrafiltration was technically feasible and the treated Whitewater had good potential to be reused in some processes in the paper machine. The reuse of ultrafiltered Whitewater in the bleaching plant was not recommended because of the high level of soluble calcium present in this stream. Therefore, a combined treatment of the Whitewater using the principle of precipitation and ultrafiltration was proposed showing good results and enabling the use of the treated Whitewater in the bleach plant.
机译:在纸浆和造纸工业中,水使用最小化是恒定的目标。减少用水的一种方法是在闭环概念中回收流出物。在造纸厂中,液体流出物的主要来源是所谓的白水,是多余的水,起源于纸浆库存脱水等纤维受污染的水。本研究研究了造纸机中的膜超滤(UF)和集成磨机的纸浆漂白厂的纸铣削白水中的重用。评估了UF系统的污染物去除和通量行为。超滤的处理技术上是可行的,处理过的白水有良好的潜力在造纸机中的一些过程中可以重复使用。由于该流中存在的高水平可溶性钙,不推荐在漂白厂中的超滤植物中的超滤白色的再利用。因此,提出了使用沉淀和超滤原理的白水的组合处理,显示出良好的结果,并能够在漂白剂植物中使用处理过的白水。

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