Plate heat exchangers are used as wastewater heat exchangers where heat is recovered or released in a contaminated liquid (usually water). Typical applications are as follows:
1. Untreated wastewater from sewers
Wastewater flowing into sewers has a huge thermal potential. This potential can be used for heating water in buildings if it is treated using a heat exchange system. The core of the system is the wastewater heat exchanger, which is installed on the ground and consists of pre-treated sewer waste. The solution must be maintained at a certain level during chemical cleaning. The flow rate is generally 0.8~1.2m/s. Its purpose is to increase the turbulence of the solution.
water supply. The heat extracted from the wastewater with this treatment method is "pumped" to higher temperature levels. Since the sewers are always located close to the building, a short distance is guaranteed, and the heat supplier and the heat consumer are almost neighbors. The opposite is also true - for cooling purposes, heat is removed from the building and passed through a heat exchanger system that is introduced into the sewer.
2. Effluent from sewage treatment plant
The heat exchange system is an economical and environmentally friendly energy treatment system that is also suitable for operators of wastewater treatment plants. Because it is not only untreated wastewater, but also wastewater from wastewater treatment plants, which provides a huge source of heat. Increasing amounts of water and cooling water are opening up new ways to improve energy efficiency throughout wastewater treatment plants. The sludge dryer not only uses solar radiation as drying energy, but also uses the heat potential of the effluent from the sewage treatment plant. The process chain sewage treatment plant wastewater-heat exchanger-heat pump provides thermal energy for high-performance floor heating of the sewage sludge dryer and ensures drying of the sludge all year round.
3. Sludge and filtrate after dehydration and digestion of sludge
The temperature in the digester is about 36°C, but this high level of heat has never been used before. Due to its special design and automatic cleaning, the wastewater heat exchanger guarantees continuous high heat transfer with these media.
The recovered energy can be directly used to preheat raw sludge on site. From an energy saving perspective, the hydrostatic primary pressure of the biogas digester eliminates the need for additional feed pumps.
4. Industrial wastewater
Like municipalities, industrial companies lose significant amounts of energy through wastewater flows. Especially in physical and chemical processes, very high temperatures can be reached.
Many companies now work 24 hours a day, so they can provide continuous traffic. In most applications, the recovered energy can be introduced directly into the industrial process, thereby shortening production line lengths. The heat extracted from wastewater has the positive side-effect of meeting discharge requirements.
November 16, 2023
Plate heat exchangers are used as wastewater heat exchangers where heat is recovered or released in a contaminated liquid (usually water). Typical applications are as follows:
