- 13 February 2008 -

Siemens Expands ENR product line

Siemens Water Technologies has expanded its enhanced nutrient removal (ENR) capabilities with the new Centrol Filter System with denitrification enhancement. The filter enhancement allows municipalities to reduce nitrogen in wastewater to levels suitable for discharge into receiving water bodies.

The process works by dosing water with a carbon source as it enters the Centrol filter through a common flume and into the distributor where the flow is evenly split among the four filter cells, located around a central column. The water passes downward through the filter media, where nitrogen and suspended solids are removed. An open plenum underdrain, located below the media, collects treated effluent and directs it to a common effluent chamber, where the nitrate concentration in the effluent can be monitored. Next, the water flows over an effluent weir for further treatment or discharge.

The type of filter media selected depends on the plant's operating conditions and effluent water quality requirements. Although a range of media types and sizes may be used, a lower specific gravity media, such as anthracite, reduces the required backwashing rate.

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