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Stirling HALBERG Sludge Mixer for Wastewater Treatment Plants – Author: Stirling Fluid Systems (Shanghai) Co., Ltd. Stirling HALBERG has over 60 years of experience in the fields of environmental technology, renewable energy, and sludge treatment, and it has a wide range of customers around the world. The MFS series sludge mixers from Sterling HALBERG have been in use at over 500 wastewater treatment plants around the world. Among them, the 4 sludge digestion tanks installed in Germany (Dinslaken), each with a capacity of 16,700 m3, use Stirling HALBERG’s MFS8 type sludge mixer; they are the largest egg-shaped sludge digestion tanks in the world. In the field of environmental management and protection in China, the Sterling HALBERG sludge mixers have also made significant contributions. For example, in the large-scale urban sewage treatment project in Lanzhou City, Gansu Province, the total investment in this project was 390 million yuan; it covers an area of 15.1 hectares, and is designed to treat 200,000 cubic meters of sewage per day. It serves an area of 42 square kilometers. This project utilized Sterling HALBERG’s advanced MFS6 type sludge mixers to break down various pollutants in the sewage, and the purified sewage thus becomes a resource that can be reused in the city. The Sterling MFS6 sludge mixer is installed at a large sewage treatment plant in Qingdao, Shandong Province. The Sterling HALBERG sludge mixer is a rotary pump. The guide cylinder is used to connect the top and bottom of the tank. The spiral impeller, an important component that serves the function of conveying, consists of two opposite spiral blades and a hub. The shaft, together with the spiral impeller, extends into the upper part of the guide cylinder, which is mounted vertically inside the digester; this enables forced circulation to be achieved, thereby effectively preventing the formation of sediment. The Sterling HALBERG sludge mixer is equipped with a rotating liquid distribution disk in its design, which helps to break down foam layers and effectively prevent the hardening of scum layers. The Sterling MFS8 sludge mixer is installed in large egg-shaped sludge digestion tanks in Germany. Its simple design and heavy-duty structure are the characteristics of the Sterling HALBERG sludge mixer. A special spiral impeller rotates in both directions at the same flow rate, accelerating sludge circulation and ensuring that the sludge is thoroughly digested. The Sterling HALBERG sludge digestion mixer can be driven directly, or it can be removed directly from the top of the sludge digestion tank without having to remove the guide cylinder inside the tank. Due to the high operating efficiency of the Sterling HALBERG sludge mixer, fewer mixers are required compared to other treatment processes, which in turn helps to minimize the user’s investment. Furthermore, an energy savings of only 2–3.5 W/m3 reduces the operating costs for users. Minimal equipment wear and a longer service life also ensure the long-term trouble-free operation of the Sterling HALBERG sludge mixer. In China, water consumption and the resulting total amount of wastewater are on the rise; finding ways to return clean water to the environment is an issue that requires widespread attention. Any organic pollutants must be removed from wastewater and treated. In this process, Sterling HALBERG’s MFS sludge mixer has been in use for many years, earning recognition and positive feedback from users. Feedback from users on-site includes: “Sterling HALBERG’s sludge mixer enables uniform and stable mixing of the sludge within the tank, effectively preventing sedimentation, eliminating floating scum on the surface, and controlling the formation of foam and scum…” Sterling HALBERG’s MFS sludge digestion mixer makes it possible to thoroughly treat sludge in cylindrical/cylindrical-spherical or egg-shaped digestion tanks. Sludge digestion is achieved through rotational flow of the sludge in the tank in two different directions, upward and downward. The Sterling sludge mixer is capable of effectively removing foam and scum layers, preventing accumulation and sedimentation, and maintaining an optimal temperature to achieve an optimized sludge digestion process. Stirling Fluid Systems places great emphasis on the environmental benefits of its products in terms of design, technology development, and manufacturing. The Stirling HALBERG sludge mixers are available in various specifications and models, and they are suitable for sludge digestion tanks with volumes ranging from 200 to 20,000 m3. Based on its typical features such as low energy consumption, anaerobic operation, thorough sludge digestion, and the ability to prevent offensive odors, Sterling HALBERG’s sealed sludge mixing system has made a significant contribution to environmental protection. Related link: Sterling Fluid Systems (Shanghai) Co., Ltd. is a subsidiary in China of the Sterling Fluid Systems Group, a world-class manufacturer of vacuum pump/compressor systems, centrifugal pumps, and water treatment equipment. The Sterling Fluid Systems Group includes several brands such as SIHI, SAT, HALBERG, and Labour. In the fields of environmental technology, clean energy, as well as sludge and wastewater treatment, Sterling Fluid Systems China provides a range of high-quality products such as sludge digestion mixers and centrifugal pumps. Originally published in PROCESS, \"Process Industry\"