Thickeners are similar to other clarifiers in appearance and operation, however, they are located at a different stage in the overall water/wastewater treatment process and are used to achieve different objectives. Thickeners receive the waste streams from screens, clarifiers, separators, and other water treatment processes and further concentrate the sludge. Typical incoming solids concentrations are between 0–3% solids. Thickened solids concentrations are typically between 3–6%, however higher concentrations can be achieved depending on process conditions.
Circular Thickeners are commonly found at municipal water and wastewater treatment plants, steel mills, refineries, chemical plants, power plants, and most manufacturing plants with wastewater treatment equipment.
Circular Thickeners require higher torque ratings than other clarifiers due the nature of the solids treated. Higher sludge densities and loadings require more durable collection systems that can stand up in these heavy, often abrasive sludge streams.
- Monroe Environmental incorporates durable high-torque drives and bottom scraping rakes that will continuously remove thickened sludge. The rake employs multiple bottom scraping blades that are angled to ensure that all settling sludge is captured and brought to the central sludge well.
- Thickening pickets and drive lift mechanisms are often utilized when sludge properties warrant additional mechanical agitation.
- Monroe offers both cast iron worm gear and fabricated steel precision gear drive assemblies.
- Sludge level detectors, underflow pumps, and related piping and instrumentation can be provided to complete a thickener design package.