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Description: Granular Frequency
Granular Frequency
A new innovative monitoring and control tool for continuous filters has been developed, tested, and implemented. It is based on radio frequency identification (RFID) technology. RFID tags — as small as the filter media particles — are used in the filter bed, acting as a proxy for the media movement within the filter. These tags are generating a vast real-time data set, allowing the remote and real-time analysis of relevant process conditions, including media circulation rates and homogeneity. The data have given rise to a better real-time understanding of the operating conditions and optimization options for filtration efficiencies. Furthermore, realtime process information acts as an early warning system to assist operators with daily activities.
Author(s)
J.W. Wouters
Subjectfiltration;innovative technology;nitrogen removal
Document typeMagazine Article
PublisherWater Environment Federation
Print publication date Jun 2021
Volume / Issue33 / 6
Content sourceWE&T magazine
First / last page(s)28 - 33
Copyright2021
Word count1,891
Subject keywordsNetherlandscontinuous filtrationradio frequency identification

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Description: Granular Frequency
Tertiary Nutrient Removal Reference Sites
Granular Frequency
Wijlre, a WRRF in the south of the Netherlands, was equipped with a tertiary combined biological denitrification and physical–chemical phosphorus removal filter facility in 2017 to simultaneously remove nitrate-N and total phosphorus, prior to discharge. A total continuous filter capacity of 1,000 m3/h has been installed, consisting of 20 individual filter units, grouped in sets...
PublisherWater Environment Federation
Copyright2021
Word count254
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Description: Granular Frequency
Monitoring and Control
Granular Frequency
Key operating features of continuous filters are the homogeneous medium circulation over the full filter and the controlled relationship between the air supply to the airlift and the actual medium circulation rate. Various modes of operation have been applied to accommodate the actual hydraulic and solids loading conditions of the filters, including start/stop modes of air supply and continuously...
PublisherWater Environment Federation
Copyright2021
Word count675
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Description: Granular Frequency
Boosting Performance
Granular Frequency
Continuous sand filters often are operated in non-optimal conditions, and hence their potential is not fully used. The key factor here is the applied sand circulation rate. If the rate is too high, the filter bed is in a “clean” status, similar to starting a conventional rapid gravity sand filter directly after a backwash. To use the full potential, the pores should be partly filled...
PublisherWater Environment Federation
Copyright2021
Word count304
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Description: Granular Frequency
Full-Scale Value
Granular Frequency
With many existing and new filter facilities equipped with the RFID technology, both the economic and process benefits are becoming clear. The process benefits are creating opportunities to stretch the operating window, meet more stringent filtrate criteria, and more reliably combine process functions within the same filter reactor. As an example, this could enable microconstituent and...
PublisherWater Environment Federation
Copyright2021
Word count299
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Granular Frequency