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Sludge treatment systems

Ulrik de Neergaard

Senior engineer


Mobile: +45 20 40 40 24

Stationary fluidbed

One of Envirotherm's specialities is sludge incineration in a so-called fluidbed oven where the sludge is incinerated in a fluidized sand bed. The advantages of using this technology are:

  • Good burn out with very low carbon content in the ash
  • No moving parts in the high temperature area
  • Binding of acidic components such as sulfur and chlorine

  • High utilization of energy by heat recovery

  • Residues in the form of dry or moistened dust 

Envirotherm is specialized in the following applications: 

  • Drinking water
  • Municipal waste water
  • Chemistry & refinery

Find more information about stationary fluidbed here

References fluidbed plants

Lynettefællesskabet, Copenhagen

Air pollution control

Various technologies can be used to ensure the precipitation of particles and aerosols. Envirotherm offers all proven filtration technologies and selects the most effective and cost-efficient solution depending on wishes and requirements.

Electrostatic precipitators are used in power stations and incineration plants right downstream of boilers to clean the flue gas of dust. In this context, the capacity ranges from 20,000 cbm/h to several millions cbm/h.

Wet-type electrostatic precipitators are employed in saturated gas atmospheres and ensure precipitation of aerosols to reach minimum pollutant levels in the cleaned gas. SO3, TiO2 and tar can be reliably removed. For cleaning purposes, the mass flow is horizontally routed through wet-type electrostatic precipitators which are manufactured from high-quality corrosion-resistant materials.

Envirotherm's design of electrostatic precipitators is used on a world-wide scale. Each project is tailored in a job-specific way to meet the requirements of the customer.

Fabric filters (also called “baghouse filters”) are based on filtration by the use of textile fabric materials. Also in this case, dust particles are removed from the gas. However, the addition of auxiliary substances provides the possibility of attaining a simultaneous adsorption of gaseous pollutants. SO2, HCl, HF and heavy metals can be reliably removed. The respective technical textile materials are selected in exact accordance with gas composition and temperature.

Envirotherm can provide a pulse-jet baghouse filter within which the filter bags are arranged in rows. In the case of a low-pressure filter the filter bags are annularly arranged in a hanging position within the limits of a bundle. Thanks to the essentially simplified cleaning principle the rotation-type procedure provides significant advantages as far as easy maintenance is concerned. Due to the lower pressure of the air to be used for cleaning purposes significantly longer service times of filter bags are ensured.

Find more information about electrostatic precipitators and baghouse filters here