Enhanced P removal by changing design and operational parameters to meet new permits with sand filters and utilising Sand Cycle: PRESENTATION ONLY

Proceedings

Enhanced P removal by changing design and operational parameters to meet new permits with sand filters and utilising Sand Cycle: PRESENTATION ONLY

Wilson, V.¹, Wouters, H.², Medley, G.¹, Matthews, R.¹, van Opijnen, E.³, Gaskin, L.¹, ¹Dwr Cymru Welsh Water, ²Brightwork BV, ³BW Products BV, The Netherlands
(free)

Introduction of Sand-Cycle monitoring and control

Application
▪ RFID Tags acting as sand grain “proxies”
▪ 3 – 5 tags per m3 filter bed volume
▪ Continuous dataflow of timestamps and tag IDs
▪ 24/7 remote output dashboards

Advantages
▪ Improved filter performances
▪ Stretched filter applications
▪ Less chemical consumption
▪ Reduced and focused operator attendance
▪ Energy savings
▪ Longer lifetime of wear and tear parts
▪ Higher uptime

Whitchurch WwTW tertiary solids removal
Background
▪ Existing plant
▪ Four filters
▪ Present capacity 14L/s per filter
▪ Solids removal only
Upgrade targets
▪ In depth diagnosis of filter operations
▪ Sand-Cycle test and data analysis
▪ Refurbishment action plan and costs
▪ Future process extension for P removal
▪ Capacity from 14L/s to 25L/s after refurb
▪ Alignment with 2040 growth horizon strategy without need for newbuild
Time schedule
▪ Diagnosis: April – July 2018
▪ Refurbishment of all filters: 2020
▪ Successful commissioning: October 2021

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