- Produce
as individuals a single tab Excel spreadsheet which shows a rough initial
design for a water treatment plant taking 15MLD of water from a lake at
750mAOD, passing it through settlement tanks on to pressure sand filters,
and from there into a chlorine contact tank to TR60 of 30 mins HRT and 1m
water depth at 575mAOD. Distance from Lake to CCT is 1500m. Fall on ground
is constant along this 1500m. - Numbers
and diameters for circular settlement tanks and sand filters, external and
internal dimensions of CCT, theoretical and actual pipe diameters sizes
will be needed to be calculated as a minimum.
Design for a water treatment plant taking 15MLD of water from a lake at 750mAOD, passing it through settlement tanks on to pressure sand filters, and from there into a chlorine contact tank to TR60 of 30 mins HRT and 1m water depth at 575mAOD. Distance from Lake to CCT is 1500m. Fall on ground is constant along this 1500m.
Numbers and diameters for circular settlement tanks and sand filters, external and internal dimensions of CCT, theoretical and actual pipe diameters sizes will be needed to be calculated as a minimum.
Rules of thumb for design:
Surface loading settlement tanks 1m/h
HRT settlement tanks 2h
Max diameter settlement tanks 30m
Surface loading sand filters 15m/h
Sand filter depth 2m
Max diameter sand filters 3m
Static head required for sand filter operation 10m
Superficial velocity pipework 1.5m/s
TLAs
AOD – above ordnance datum
HRT – hydraulic residence time
CCT â chlorine contact tank
MLD – megalitres per day
Design for a water treatment plant taking 15MLD of water from a lake at 750mAOD, passing it through settlement tanks on to pressure sand filters, and from there into a chlorine contact tank to TR60 of 30 mins HRT and 1m water depth at 575mAOD. Distance from Lake to CCT is 1500m. Fall on ground is constant along this 1500m.
Numbers and diameters for circular settlement tanks and sand filters, external and internal dimensions of CCT, theoretical and actual pipe diameters sizes will be needed to be calculated as a minimum.
Rules of thumb for design:
Surface loading settlement tanks 1m/h
HRT settlement tanks 2h
Max diameter settlement tanks 30m
Surface loading sand filters 15m/h
Sand filter depth 2m
Max diameter sand filters 3m
Static head required for sand filter operation 10m
Superficial velocity pipework 1.5m/s
TLAs
AOD – above ordnance datum
HRT – hydraulic residence time
CCT â chlorine contact tank
MLD – megalitres per day
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