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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：金属去除和白水回用

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摘要

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，尽量减少用水是一个不变的目标。减少用水量的一种方法是将废水以闭路循环的方式进行再循环。在造纸厂中，液体流出物的主要来源是所谓的白水，白水是多余的水，源于纸浆脱水和其他纤维污染的水。这项研究研究了造纸厂和综合工厂的纸浆漂白厂中的膜超滤（UF）后造纸厂白水的再利用。评估了超滤系统的污染物去除和通量行为。通过超滤处理在技术上是可行的，并且处理后的白水有很好的潜力可在造纸机的某些过程中重复使用。不建议在漂白厂中再利用超滤白水，因为该物流中存在大量的可溶性钙。因此，提出了使用沉淀和超滤原理的白水的组合处理，其显示出良好的结果，并且使得能够在漂白设备中使用处理后的白水。

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