Energy-efficient mixers for the activated sludge process
Approximately 70% of the total energy demand of a water or wastewater treatment plant is consumed specifically for the mixing and aeration systems in the activated sludge process. In view of that it is becoming increasingly important to use systems that deal with resources in a responsible way.
HYPERCLASSIC® -Mixer – the hyperboloid mixing technology
INVENT made significant contributions to the efficiency and effectiveness of such plants with the introducing of hyperboloid mixing technology in the early 1990s. Since this time, the hyperboloid mixing technology has been continuously developed. Many thousands of successfully operating installations world-wide impressively demonstrate that the HYPERCLASSIC®-Mixer has become the industry standard in this field of application.
Example New York City
The tremendous potential for energy savings can be shown using the example of the large wastewater treatment plant Bowery Bay in New York City. At an equal purifying capacity the energy costs of the Hyperboloid-Mixers have shown to be as little as only a third as those of the replaced mixers. The slightly higher initial capital costs were compensated by reduced operational costs. In total, the savings mounted up to 3,500,000 US-Dollar over a period of 10 years. The New York experience demonstrates without doubt, that the selection of mixing equipment has a significant effect on the operating costs of large wastewater treatment plants.
Due to the achieved energy savings and high level of reliability of the INVENT equipment the City of New York also have converted Wards Island, Jamaica Bay, Coney Island, Rockaway Beach and Hunts Point plants to INVENT Mixers.
The HYPERCLASSIC®-Mixer is the optimum mixer for all suspending and homogenization tasks required for water and wastewater treatment. The rotation of the hyperboloid-shaped mixer-body close to the bottom generates high-speed and turbulence at the bottom of the basin. This reliably prevents the settling of sludge particles. Eight transport ribs generate a three-dimensional main flow with a high circulation rate. This ensures excellent, uniform mixing. Because of the low speeds, the energy input is low in shear force. Sludge flocculation is thus subjected mechanically to minimal stress loads. Low speed at the water surface reliably prevents aerosol formation and oxygen transfer. The efficient design and the use of rugged materials minimize operating and maintenance costs.