Sewage sludge dewatering is the process of separating the liquid contained in solid (dry) matter.

K-BOX solution reduces the volume of sludge by a factor of 10 thanks to a simple automated process that is resource-efficient (in terms of electricity and reagents) compared to using a filter press or centrifuge.

The slurries are first coagulated then flocculated by injecting a couple of reagents specific to each site, determined in the laboratory.

The resulting flocs become denser and larger in a maturing chamber prior to being injected into the press.

   The flocculated sludges are injected into one or more presses, each one consisting of :

  • a worm screw that rotates slowly
  • a drum formed by moving rings

The screw drives the sludges along and causes the rings to slide between them, facilitating the liquid/solid separation of the sludge while at the same time ensuring constant self-cleaning. The dewatered sludge, that can be shovelled, is gathered in a big bag or in an ampliroll-type skip via a conveyor that is available as an option. The filtrates are collected and sent to the head of the processing station.

All the equipment is installed in a shipping container to facilitate immediate connection to existing installations and a limited footprint.

  • Highly conclusive feedback: sludges that can be shovelled, dried by 15% to 18%
  • Compact, plug and play solution that uses few resources
  • Automated system for ease of operation
  • Limited wear and tear thanks to slow rotation speeds
  • Processing range from 3 to 30kgMS/h
  • Continuous mechanical unclogging process
  • Tailor-made choice of reagents


Planted Reed Drying Beds (PRDB)

The reeds are planted on the surface of the bed, which they densely cover. They develop a network of roots, similar to a drainage system, that spreads during the steady accumulation of sludge across the layer height (usually, more than a meter). The dissolved matter decomposes due to the biomass of aerobic bacteria on the filter medium as well as on the settled bed that accumulates on the surface. The beds must be cleared of excess dry and mineralized sludge every 5 to 8 years.

  • Sizing :

The core principal behind sizing is the annual loading rate of Dry Matter per m2 the system can handle.
The drying beds are usually divided into compartments to distribute the drainage and give the bed time to dry.

  • Advantages :
The drying process in planted reed beds consumes very little energy and transforms sludge into moist soil (15% to 35% dry solid material) that is easy to transport, compost, and store on agricultural headlands.