media removal, replacement and filter inspection in a rapid gravity sand filter lessons learnt the...
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Media removal, replacement and filter inspection in a rapid gravity sand filter
Lessons learnt the hard way
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What is the most effective way to replace 37 tonnes of filter media?
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Three things to consider
Removal of
old media
Inspect and repairthe empty filter
Re-instatingThe filter
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2007 – The Hard Way
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Media stored in sacks!!
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Re-sorting media after sacks rotted
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What we found!Damage to filter 2 in 2007
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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
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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
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Filter floor before baffle walls put in and levelled channel plate.
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Media replacement because of poor performance on Filter #2 due to re-using
old media
2012 – We’ve Nailed It
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Washing workers boots in sodium hypochlorite
Hygiene procedures are followed to help minimise any possible contamination.
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Davies staff removing the media one layer at a time then storing it all separately onsite for re-use within other council
jobs.
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Filter Inspection
Check all
nozzles
Inspect conditionOf walls and filter
floor Watch theair scourpattern
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Turitea’s #1 Process Technician inspecting filter nozzles.
That’s me!!
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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.
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Two important people inspecting the air scour patterns after the repairs are completed.
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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.
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Putting brand new media into the filter using a hiab truck.
1 Bag at a time
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What is the most effective way to replace 37 tonnes of filter media?
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Conclusion
From 3 weeks To 3 hours
Ask this guy!