创新性淀粉节约方案——通过纤维中的淀粉回收提高纸板生产的可持续性

Novel starch saving program improves sustainability in board manufacturing through the reuse of recycled fiber starch

用于制造再生纸和纸板的纤维原材料中含有大量淀粉。由于微生物的活性,使用回收纤维的纸浆中的过程水通常含有大量淀粉水解酶。这经常导致大多数淀粉在回收纤维进入造纸机之前水解掉,因此潜在地增加了废水中的化学需氧量COD、pH值降低,并且由于碳酸钙溶解使得电导率变高。在本文中,我们提出了一种新颖的提高淀粉再利用及包装纸强度的理念。该理念包括使用特定的淀粉酶抑制剂,防止回收纤维和损纸中的淀粉水解,以及全新的助留系统用以提高淀粉在最终产品中的保留率。淀粉酶抑制剂自身或与杀菌剂组合能够有效防止淀粉水解。这在实验室研究和工厂试验均有所体现。此外,留着率和强度实验表明混凝剂、微聚物和新的高分子聚合物的组合提高了淀粉的留着率和滤水性。

The fiber stream raw materials utilized to manufacture recycled paper and board contain a significant amount of starch. Due to microbial activity, process waters in paper mills utilizing recycled fiber usually contain high amounts of starch-degrading amylase enzymes. This usually results in degradation of most of the starch before recycled fiber enters the paper machine, thus potentially increasing COD in waste waters, p H reductions, and higher conductivity due to calcium carbonate dissolution. In this paper we present a new concept for improving starch reuse and the strength properties of packaging board. It consists of preventing starch degradation in recycled f iber and broke by utilizing a specific amylase enzyme inhibitor, coupled with a novel retention system that ultimately improves starch retention into end product. Amylase enzyme inhibitor, as such or combined with biocides, was efficient in prevention of starch degradation. This was shown both in lab studies and in mill scale trials. Additionally, retention and strength experiments showed that a combination of coagulant, micro-particle and a new high molecular weight polymer improved starch retention and drainage.