REDUCING REMAINDER MATERIALS AND THEIR RE USE THROUGH SEPARATION METHODS

The following methods may be used in paper mills which process almost clean waste paper or none at all. The remainder materials carried by t heir waste water may be treated by a combination of various separating methods, so that most of these materials can be fed back into the pro cess. Some of these separating methods are also being applied in waste paper and pigment preparation. In many mills the possibilities of red ucing the quantity of the accrueing remainder materials by in-mill mea sures are not completely exhausted. Activities should firstly be direc ted towards such measures. In a prototype plant it was possible to red uce the quantity of remainder materials by 80% and over. The cost savi ngs compared to dumping or incineration produce a payback of the separ ation plant within two to five years.