An installation with four heat exchangers of the sludge-water type in the Bath WWTP (province of Zeeland) Netherlands – Wolter and Dros for Waterschap Brabantse Delta. Two heat exchangers extract energy from the sewage sludge, while two other heat exchangers use this energy to heat and maintain the temperature of the digestion sludge.
Design of heat exchangers
The entire design is based on the kW requirement, in this particular case 550 kW. In this case, we chose a type of heat exchanger that can handle large flow fluctuations (+ – 50 %). One of the specific features of the Lackeby heat exchangers are the patented turning chambers, which ensure optimal sludge mixing and homogeneous sludge temperature. Good insulation ensures that heat losses are reduced to an absolute minimum. Moreover, the space requirement of these heat exchangers is down to a minimum, compared to other types of heat exchangers. An additional advantage is that the modules are stackable.
Läckeby sludge/water heat exchangers are the result of innovative thinking and 40 years of experience in this sector. This range of devices was developed to meet very specific sludge heating or cooling requirements. The unique, patented design has resulted in a compact heat exchanger with minimal maintenance requirements.
Advantages of Läckeby heat exchangers
Läckeby heat exchangers are compact, robust, easy to install, maintain and highly reliable. The round sludge channels reduce the risk of clogging. The innovative design with patented turning chambers ensures high energy transfer and low pressure losses. Moreover, maintenance is quick: just a few loosening bolts and hinged turning chambers.
Sludge applications:
- Direct heating or cooling of sludge on the supply line
- Heating and/or cooling of digested sludge over the digester or pasteurisation
- Energy reuse from hot sludge
Water treatment applications:
- Cooling of wastewater in, for example, biological water treatment systems
- Energy reuse from effluent
