Biosolids Sludge Dewatering Solutions

Boosted wastewater sludge dewatering with a piston press

The Dehydris* Twist unit is based on the Bucher Unipektin piston press, which is fed with drinking water sludge or pre-thickened wastewater sludge conditioned with reagents (polymers possibly mixed with mineral reagents).

The press, equipped with semi-solid drainage elements, operates in cycles (from 2 to 3 hours). The length of the cycle depends on the type of sludge and efficiency required (dryness or flow rate). Each cycle is made up of three, entirely automated, main phases:

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Dewatering Sludge Treatment Features
What is the Dewatering of Sludge?

Dewatering Sludge Treatment Features

SAVINGS
- increased productivity with a possibility of non-stop operation (24/7) without the need of a staff presence, smaller foot-print than a filter press.

HIGH PERFORMANCE
- high dry content obtained without the addition of lime: up to 40% for drinking water sludge and auto-thermicity achieved for urban wastewater sludge, versatile: accepts both drinking water and wastewater sludge (mixed sludge, fresh, digested, thickened or primary).

SIMPLE AND EASY OPERATION
- enclosed and ergonomic industrial process 100% automatic operation including emptying.

REDUCED SLUDGE BULK
- up to 30% reduction in sludge bulk compared to conventional dewatering.

What is the Dewatering of Sludge?

What is dewatering in wastewater?: Wastewater has a solids component within it. Separating the solids from the wastewater allows each proponent to be treated optimally.

What is sludge and how is it treated?: Sludge is typically treated by digestion. Digestion gets the sludge into a more stable form for disposal and minimizes the volume.

What is sludge dewatering?: Sludge dewatering is the process by which water is removed from solids. Typically local regulations dictate the requirement for the transportation and land application of sludge. Anaerobic digestate is approximately 5 – 8% dry solids. In order to get the solids into cake form, 20+% is required.

What is the sludge treatment process?: Digestion, drying and thermal oxidation can be utilized for treating sludge.

Why is Sludge Treatment Necessary?: Raw sludge is not a stable product and therefore cannot be land applied or sent to a landfill. Therefore some sort of treatment is required.