Tilting-blade mixers for Danish WWT plant
5 Sep 2011
Hedensted, Denmark – Landia has completed a major mixer and pump installation for the first of two new 40m diameter, 6m deep tanks at Hedensted Central wastewater treatment plant.
The installation includes four Landia POPL-I mixers with special pitch-adjustable long blades that create an optimum combination of effective mixing and low energy consumption.
The new process tanks (7800m3 each) are replacing six existing units (1400m3 each) in a Euro5.9m restructuring project designed to create much improved wastewater treatment facilities in the Hedensted Municipality near Vejle, Denmark.
The long-bladed Landia mixers offer enhanced efficiency as they provide the flexibility to tilt the blades to virtually any angle, noted Ulrik Folkmann, Hedensted Spildevand’s operations manage
“We will have to run the mixers almost 24 hours per day, so it is vital that they don’t burden us with high energy costs,” said Folkmann. “There is a clear advantage in the tilting design of the Landia equipment, which will give us the best and most energy efficient mixing. Both tanks will have seven pole-mounted Landia mixers, making it much, much easier for inspection and servicing”
In addition to the four pitch-adjustable Landia POPL-I mixers, the Landia installation also includes two AXP-I axial pumps per tank, installed in the wall between two tanks being used to move water from one tank to the other - plus one POP-I submersible medium-speed mixer per tank.
The first new tank at Hedensted Central WWTP is actually comprised of three tanks inside each other. Over 10,000 m3 of soil that was moved has been built into the exterior walls as part of this first stage of the project. Also in keeping with Hedensted WWTP’s strategic environmental plan, heat used in the base plate process is being used for the site’s administrative buildings to help the company reduce its CO2 emissions.
Due for overall completion in August 2012, when the second of the 40m diameter tanks will also be built and operational, Hedensted Central WWTP will have increased its current 25,000pe capacity to cope for future needs of over 45,000pe.
Together with two existing plants in the nearby cities of Juelsminde and Toerring, these three sites will cater for all wastewater treatment needs in the area - offering improved and more energy-efficient processes than what was previously provided by six separate smaller treatment plants.
