Water is used throughout paper making but not all of it is recycled - and 80% of the solids in paper industry sludge come from solids suspended in that wastewater. Our industrial screening and treatment technologies can help you to improve profitability by capturing those solids to improve process efficiency, recycle water more effectively and recover and reuse more pulp.
The pulp and paper industry is water intensive. Once pulp is taken in water and a sheet of paper is made, all that water still needs to be dealt with. Equipment cleaning and steam also contribute to wastewater load.
While much of this water can be recycled, some of it is wasted and ends up as sludge - pulp and paper mills can produce up to one cubic metre of sludge for each ton of paper produced. 80% of total suspended solids (TSS) in the water treatment process is transferred to wastewater treatment sludge during the primary treatment process, and as sludge treatment, handling and disposal costs money these wasted solids represent a cost to the business.
Our pulp and paper processing water treatment systems can improve your profitability by helping you capture and remove suspended solids before they reach downstream treatment systems, cutting the costs of sludge processing and handling, providing options for recycling and reuse of both water and pulp, and improving downstream treatment capacity and efficiency.
The Hydro MicroScreen™ ultrafine rotating belt screen removes suspended solids with extremely high efficiency, helping pulp, paper, cardboard and packaging businesses to reduce the quantities of sludge that need to be treated by expensive downstream sludge treatment processes. The system's high solid removal performance allows you to reclaim valuable pulp that enters wastewater flow streams and reuse solids that would otherwise be lost.
Most plants use Dissolved Air Flotation (DAF) for wastewater treatment, and many plants are moving to much more capital-intensive treatments such as activated sludge to further reduce TSS and Biological Oxygen Demand (BOD).
Hydro MicroScreen™ is the ideal way to protect your DAF process from the impacts of excessive solids loading and preserve DAF processing capacity, preventing operational and energy cost increases and potentially providing the opportunity to re-rate a DAF system for higher capacity.
Hydro MicroScreen™ captures pulp and paper waste scraps from flow streams, allowing water to be reused for activities such as steam production or plant washwater. In addition, the system outputs clean, dry product (2-4% total solids directly from the screen, and up to 50% total solids when used with the integral dewatering auger) that can often be re-pulped while preventing these materials from entering sludge processes.
Watch our video to see the Hydro MicroScreen™ screening particle board processing water:
An Oregon particle board plant was looking for a more effective TSS removal system that could handle larger loads, reduce required detention time for settling, protect their sedimentation system, and reduce the frequency of required cleaning. The Hydro MicroScreen™ achieved 77% TSS removal, with 25% TS on average. This allowed the solids to be fed back into the plant process, allowing the plant to reclaim solids rather than paying to send them to landfill.
A California pulp and paper plant was wasting 1,200 hours each year just keeping their high-maintenance existing TSS removal system operational – not to mention the impacts of the associated downtime. A trial of the Hydro MicroScreen™ system produced solids dry enough that they could be sent directly to landfill without any additional processing, and the system was estimated to pay for itself in just over six months from maintenance savings alone.
A South Carolina paper packaging manufacturer was facing challenging solids loading conditions in their wastewater treatment lagoon, which required increasingly frequent, costly dredging to remove accumulated solids. The plant tested the Hydro MicroScreen™ alongside their existing drum screen system, and discovered that the the Hydro MicroScreen™ could remove over 400% more solids - reducing their lagoon dredging frequency by 50% to 66%.
The Hydro-Sludge® Screen removes pulp and paper by-product materials such as rejects, scrap material and stringy trash, sending higher quality sludge to digestion systems preserving sludge treatment capacity.
Removing dry solids from primary process wastewater sludge can reduce the likelihood of blockages and help to protect other treatment processes.
Delivering screenings at up to 40% total solids, the Hydro-Sludge® Screen removes, compacts and dewaters coarse material in sludge to reduce the solids handling burden, cutting the cost of screen solids management, transport and disposal.
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