Sludge Heat Exchanger

(Klean-Wall ™️ Heat Exchanger)

The Komax sludge heat exchanger can be utilized for mixing and heating municipal sludge, FOG, and manure for aerobic/anaerobic digestion purposes. The sludge to sludge heat exchanger can also be used for reclaiming heat from hot outgoing digested sludge to heat the cold incoming sludge. The Komax sludge heat exchanger enhances biogas production and also helps in production of Class A biosolids.
The sludge heat exchanger or Klean-Wall Heat Exchanger used to heat sludge in a recirculation loop with a digester, utilized for co-digestion process. The sludge heat exchanger is more thermally efficient than a straight shell and tube heat exchanger due to the patented non-clogging mixing elements know as Hi-Pass mixing elements, in the process pipe tubeside and in the shellside. This technology keeps the pipe walls clean and results in much more consistent performance over time with no build up, scaling or plugging of the waste treatment facilities effluent line. Due to the heat transfer improvement Komax shell and tube heat exchangers can be 50% smaller than a standard heat exchanger for the same heating application.



  • Municipal Waste Water Treatment Plants
  • Dairy Farms
  • Breweries
  • Landfills
  • Biofuels


  • Municipal Sludge Mixing
  • FOG
  • Reclaiming heat from outgoing sludge/deliver to cold incoming sludge
  • Heat sludge to deliver re-circulation of anaerobic digestion

End Connections & Available Custom Options

Flanged Ends: Flanged end connections allow for easy mounting of the static mixer into the process pipeline. As a general standard, metal static mixers have raised face flanges per ASME B16.5 or ASME B16.47 (for sizes larger than 24”) standards. Komax can also fabricate mixers to contain DIN (metric) flanges as well.

Victaulic style Quick Disconnect couplings: These connections help in quick assembly and disassembly of piping connections to the heat exchanger. These can also be useful to quickly put together or break down the heat exchanger into individual passes for cleaning or maintenance.

Materials & Sizing

Diameter: Customer Specifications

Standard Metals: Carbon Steel & Stainless Steel

Pipe Schedule: Schedule 10-40

Mixing Elements

Non-clogging Mixing Elements (Hi-Pass)

Set of mixing elements placed on opposite side to allow wall-to-wall radial transfer of sludge and debris with no clogging or build up as it offers a wider opening in the center of the static mixer, allowing bigger particles to pass through. The jacketed heat exchanger transfers heat from one media to another by utilizing hot water or hot sludge. The internal hi-pass non-clogging mixing elements create high turbulence at the pipe wall, removing the internal film coefficient that prevents high efficiency heat transfer.

Downloadable Information:

Sludge Heating Brochure

Sludge Brochure

Sludge Mixer Brochure