De Nora has more than 50 years of experience and > 1,300 installations providing media filtration solutions to both municipal and industrial markets. A variety of filtration products allows De Nora to customize filter design for optimal performance in a particular application. Common municipal applications include pre-treatment of seawater for desalination, filtration of drinking water sources, and tertiary treatment of wastewater. Industrial applications include both gravity and pressure filtration, with a focus on steel industry applications that require removal of high concentrations of oil and grease and mill scale solids
Easy to Operate and Maintain
Reliability / Equipment Longevity
Small Footprint / Compact Design
The TETRATM LP BlockTM dual parallel lateral underdrain from De Nora is a proven design of filter underdrain offering superior distribution of both backwash air and water, either sequentially or concurrently. The TETRATM LP BLOCKTM underdrain ensures lower operating costs and effective backwash distribution that can improves run time.
Effective media cleaning is the key requirement for a filter to function efficiently under all loading conditions. Backwashing gravity filters is necessary to remove the solids collected by the media during the filtration run. The use of concurrent or sequential air and water significantly reduces the volume of dirty backwash water produced and drastically lowers operating costs through the uniform backwash process.
Benefits Of Tetra De Nora
The TETRA™ LP Block™ underdrain provides an improved distribution of backwash water to the filter media through the use of dual compensating laterals. Backwash water enters the primary laterals and then passes through the control orifices into the secondary laterals.
Backwash air is properly distributed by the careful design of the upper control orifices between the primary and secondary laterals, providing even air distribution.
Media retention on plates maximize the available filter tank depth. Careful quality control and testing during the plate manufacturing process is used to ensure that the media retention plates prohibit media pass through and provide proper flow characteristics. De Nor should be consulted on the use of media retention plates when lime softening or alum coagulant are used upstream as these are known to potentially plug the plates.