|McLanahan Corporation has long supplied traditional High-Rate Thickeners to recover immediately re-usable process water. To add to this line, McLanahan is now offering ultra-dense thickeners such as the Deep Cone Thickener.
Because this water is available adjacent to the plant site, pump horsepower is substantially reduced and the elimination of settling ponds means resources are not covered up.
Thickeners are typically found in the following applications:
Thickeners use a minimal amount of polymers/chemicals in order to help agglomerate very fine particles into larger particles that will settle much faster. Solids settle on bottom of the Thickener while clean water rises to the top. Rotating rake arms collect settled sludge and move it toward the center discharge cone. Solids are typically pumped out at 35-45 percent solids.
Deep Cone Thickeners:
Tanks on these Thickeners are typically taller to provide a free settling zone. They also have a deep compression zone with long mud residence times, allowing sludge to compact under its own weight. Further significant sludge compaction can be accomplished by the use of a rotating picket mechanism that plows out channels in the compressed mud, creating passageways for trapped water to escape the bed. This results in thickened material forming a high-density sludge or paste.
Transportation of the sludge or paste from the underflow depends on its rheological properties. Centrifugal pumps may be employed at sludge yield stresses of up to 200 pascals, whereas higher yield slurries require a positive displacement pump for transport. Deep Cone Thickeners are free-standing, raised units that are available as either welded single piece tanks up to 12’ (3.66 m) in diameter or as field welded or bolted tanks up to 40’ (12.19 m) in diameter. They are characteristically tall with height to diameter rations ranging from 1:1 to 2:1.
These Deep Cone Thickeners offer producers underflow densities that are often not achievable with standard high-rate thickeners. Benefits of this performance include: