Application of plate heat exchangers in wastewater treatment

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Plate heat exchangers can be used as wastewater heat exchangers in applications where it is necessary to recover or release heat from contaminated liquids, usually water. Typical applications are as follows: 1. Untreated wastewater from sewers contains a large amount of thermal potential. If a Prepler heat exchange system is used for this purpose, this potential can be utilized for heating water used in buildings. The core of this system is a wastewater heat exchanger, which is installed on the ground and uses pre-treated sewage waste. ① During chemical cleaning, the solution must flow at a certain speed, typically between 0.8 and 1.2 m/s. Its purpose is to increase the turbulence level of the solution. Water supply. The heat extracted from wastewater using this treatment method is \"pumped\" to higher temperature levels. Since sewers are always located near buildings, short-distance passage is ensured, and heat suppliers and heat consumers are almost neighbors. The reverse is also true – for cooling purposes, heat is removed from the building through a heat exchange system connected to the sewer system. 2. The Prippler heat exchange system for wastewater treatment plant effluent is an economical and environmentally friendly energy treatment system, also suitable for operators of wastewater treatment plants. Because it is not only untreated wastewater but also wastewater from wastewater treatment plants, all of which provide a huge heat source. The increasing amount of water and cooling water open up new avenues for improving the energy efficiency of the entire wastewater treatment plant. Sludge dryers utilize not only solar radiation as drying energy but also the thermal energy from the wastewater treatment plant effluent. In the process chain of the wastewater treatment plant, wastewater – heat exchangers – heat pumps provide the thermal energy needed for high-performance floor heating in the sludge drying machines, ensuring that the sludge remains dry throughout the year. 3. High-temperature = high-energy recovery of the sludge and filtrate resulting from sludge dewatering and digestion. If the Prippler wastewater heat exchanger is fed by sludge from the sewage treatment plant’s digesters or the filtrate from sludge dewatering systems, this simple formula applies. The temperature in the biogas digester is about 36°C, but this high level of heat has never been utilized before. Thanks to its special design and automatic cleaning, the wastewater heat exchanger ensures continuous and high heat transfer with these media. The recovered energy can be directly used on-site to preheat the original sludge. From the perspective of energy conservation, the hydrostatic primary pressure in biogas digesters eliminates the need for an additional feed pump. 4. Like municipal wastewater, the wastewater generated by industrial enterprises also results in significant energy losses. Especially in physical and chemical processes, very high temperatures can be achieved. Many companies now operate 24 hours a day, which allows for continuous traffic. In most applications, the recovered energy can be directly incorporated into industrial processes, thereby reducing the length of production lines. The heat extracted from wastewater has positive side effects and can meet emission requirements.