Solidification / Immobilisation of sludge

  • solidification-waste-treatment
    Solidification of sludge
  • solidification-sludge-waste
    Solidification of sludge
  • solidification-feeding-beltconveyor
    Feeding unit
  • solidification-sludge-feeding
    Input material
  • solidification-sludge-treatment
    Storrage silo for sludges
Key Facts
Continuous mixer: 1,000, including vapour filter and H2 measuring
Throughput capacity: 50 m3/h; approx. 50% sludge and 50% dry solids, 1 shift/day
Output consistency: Dust-free, non-sticky, granules up to 30mm grain size, direct loading to truck
Feeding dry solids: Silos with 80 m3 each; including screw conveyors for fly ashes, lime, etc.
Feeding WWT sludge: 40 m3 bunker unit each; operated by hydraulic agitators, loaded by truck

Solidification/Immobilisation of sludge from physical-chemical WWT process

econ industries‘ client in the east of Germany is one of the few specialised companies in Europe for the treatment of mercury contaminated waste. Typical input material for this type of treatment is sludge from the natural gas industry or other residues from chemical processes, i.e. contaminated filter cake from waste water treatment.

Since 2002 the client has been operating an econ industries thermal desorption plant, specially designed for the treatment of mercury contaminated sludge with including NORM radioactive natural gas. The plant is designed as a skid-mounted execution for on-site treatment. To double their capacity a second econ industries plant was ordered and commissioned in 2009. This plant is a custom-made design, built on 6 years of successful operational experience. The plant is supplied with a thermal oil heating unit, which has the in-built option for future expansion.

The prime aim of the thermal processing plant ­- besides the removal of water and typical rinsing agents such as benzene, toluene or lube oil – is to recover the mercury content for further recycling. In a separate dust-free process the remaining cleaned solids are cooled and re-moistened. Due to some occurring heavy metal content and some natural occurring radioactivity the treated solid residue is immobilised with chemical polymers before final disposal.

Design characteristics

  • Very economic, continuously working turbulent mixing process with accelerated torque
  • Sludge handling by direct feeding from truck to storage bunker, sludge does not touch the ground
  • After mixing direct loading to truck, no intermediate handling, no ground floor pollution
  • Turn-key delivery including control unit and explosion protection by automated H2 measuring
  • Fully automated PC controlled system including remote control from central office building
  • Almost maintenance free mixing and conveying equipment, all service work can be done by own staff