Media removal, replacement and filter inspection in a rapid gravity sand filter
Lessons learnt the hard way
What is the most effective way to replace 37 tonnes of filter media?
Three things to consider
Removal of
old media
Inspect and repairthe empty filter
Re-instatingThe filter
2007 – The Hard Way
Media stored in sacks!!
Re-sorting media after sacks rotted
What we found!Damage to filter 2 in 2007
Media is removed by Richardson’s Drilling using an air vacuum pump system, then sorted and stored in big yellow metal shipping containers
onsite.
2010 - Getting Better
Richardson's Drilling staff members are a committed bunch!The only way he could get the suction line primed
Above and beyond the call of duty
Note the clean undies
Filter floor before baffle walls put in and levelled channel plate.
Media replacement because of poor performance on Filter #2 due to re-using
old media
2012 – We’ve Nailed It
Washing workers boots in sodium hypochlorite
Hygiene procedures are followed to help minimise any possible contamination.
Davies staff removing the media one layer at a time then storing it all separately onsite for re-use within other council
jobs.
Filter Inspection
Check all
nozzles
Inspect conditionOf walls and filter
floor Watch theair scourpattern
Turitea’s #1 Process Technician inspecting filter nozzles.
That’s me!!
Once repairs are made it is important to inspect air scour and up wash patterns before the media is replaced to
check the repairs were successful.
Two important people inspecting the air scour patterns after the repairs are completed.
Re-instating
Mark the filte
r
walls for th
e different
media grades
Back wash in between layersto wash the media, and
remove the thin layer of ‘fines’ between
each layer Soak in Sodium hypo overnight.
Putting brand new media into the filter using a hiab truck.
1 Bag at a time
What is the most effective way to replace 37 tonnes of filter media?
Conclusion
From 3 weeks To 3 hours
Ask this guy!
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