Last year we undertook the design and installation of a reject paper pulp system for a paper mill. Our challenge was to dewater and change the physical structure of the reject pulp, so instead of it going to land spread or fill, it could be used as animal bedding.
Paper mills that use recycled paper and card to produce tissue paper and low grade paper have a left over waste that includes the ink and fibre not recovered in their pulping system, this comes out as a wet sludge. Instead of paying to land spread or fill the reject paper pulp, it is now a saleable commodity, which is sought after by the agricultural community.
This particular site has a diverse range of mills, with different outputs and fibre content. Due to these differences we had to do a lot of technical modifications to the presses.
Equipment supplied in the past has not been able to achieve the same moisture results on a consistent basis. Therefore, we designed an inlet feed system, as well as an outlet. Space was also of a main concern on this particular site.
To overcome the challenges we used a Vincent CP6 press to carry out tests and upscaled the result to the relevant throughputs. In order to complete the system, it was necessary to design and build a vertical incline conveyor to transport the processed material up to a height of 8 metres to then convey to a storage area 30 metres away.
Outcome: Supplied two Vincent VP30s, plus incline conveyor and 6 belt conveyors.
Prior to the installation of the system the dry solids were averaging between 40-45%. After going through the system’s process the resulting dry solids are now consistently above 56%. A drastic improvement increasing the value of the end product.