Huddersfield - Process Commisioning presentation 030209

Huddersfield WwTW – FFDProcess Commissioning

Huddersfield Complex

Cooper Bridge

Upper Brighouse & Calder Valley

Heaton Lodge

A62

Deighton

Lower Brighouse

Colne Bridge & Bradley

A644

River Colne

River Calder

Calder & Hebble Navigation Canal

A62Railway

Railway

River Calder

Lower Brighouse Inlet PS

Upper Brighouse SBR

Heaton Lodge Filter

Beds

Cooper Bridge Filter Beds

Colne Bridge BAFF

Deighton Primary Tanks

Lower Brighouse Sand Filters

Brighouse Catchment

Heaton Lodge Humus Tanks

Huddersfield Catchment

Cooper Bridge Humus Tanks

River Calder

Lower Brighouse New ASP

Lower Brighouse New FSTs

Lower Brighouse New

Selector

15%

55%

70%

30%

Down-rate Heaton Lodge

Optimise Colne Bridge

Close Cooper Bridge

Huddersfield Complex

Lower Brighouse – Scope of Works

• Selector Tank• 4 Lane ASP Works • 4 Final Settlement Tanks (40m diameter)• RAS/SAS Pumping Station

• Associated pipework to connect to the existing system

Calder Valley – Scope of Works

• New SAS tanks with associated pumping station

• New thickening units consisting of drum thickeners to fit into existing belt thickeners building

Cooper Bridge – Scope of Works

• Filter beds and humus tanks to be moth-balled

Process Commissioning

Areas for process commissioning– Activated sludge process (Lower Brighouse)

• Selector• Activated sludge plant lanes• Final settlement tanks• RAS/SAS Pumping station

– Sludge process (Calder Valley)• Sludge balancing tanks• Drum thickeners and associated processes

Process Commissioning

Areas for process commissioningFor De-commissioning

– Biological Filters (Cooper Bridge)• De-commissioning of the biological filters• De-commissioning of the humus settlement tanks

Process Commissioning – Activated Sludge Process

• First ASP lane and all final settlement tanks filled with main flow at 119 L/s.

• When ASP lane ½ full start aeration• Main flow switched off• Drop bell-mouths to lowest level in FST’s and circulate at minimum

scour rate

Aeration

Activated sludge lane

Final Settlement

Tank

Sel

ecto

r XX


• Sludge from sludge tanks to “seed” the activated sludge lane at 500m3/day from Calder Valley

• Once ASP lane is acclimatised start to add flow at a rate of 119L/s.• Effluent to be over-pumped to Cooper Bridge via the sand filter

backwash tank until effluent is of good enough quality for discharge.

Aeration


Final Settlement

Tank

Sel

ecto

r X

Aeration


Final Settlement

Tank

Sel

ecto

r

Aeration


Final Settlement

Tank

Sel

ecto

r

Seed Sludge

X


• Successively bring ASP Lanes into service whilst maintaining an F/M ratio of 0.07

• When flows increase to greater than 250 L/s then start to de-commission Cooper Bridge filters

Aeration


Final Settlement

Tank

Sel

ecto

r

Seed Sludge

Process Commissioning – Biological Filter De-commissioning

• De-commissioning of the filters at Cooper Bridge• To be co-ordinated with the ramp up in flow of the ASP• Filter beds to be taken off-line as the flows and loads to ASP is

increased• Isolate filters once flows have stopped• Once isolated spray with insecticides to prevent future fly nuisance

• Potential Problems– Maintaining Wetting Rates on Biological Filter– Fly nuisance during and after de-commissioning– Odour Nuisance


– Filters are to be taken off in pairs (i.e. one distributor channel is one pair of filters)

– The filters to be taken off first, will be the worst performing filters (i.e. the filters with distributors missing will be taken off first)

– Re-circulation of flows will be necessary so the Cooper Bridge re-circulation pumping station will need to be working


– First pair of filters will be taken off by day 23

– Next two pairs of filters will be taken off by day 32

– Next pair of filters will be taken off by day 40– Last two pairs of filters can be taken off when

programme allows as with re-circulation pump and PFF from Heaton Lodge the wetting rate is maintained

Process Commissioning – Sludge treatment works (Calder Valley)

• Pre-commissioning tests with SAS to make sure the system is operating correctly around day 33-34. This allows 14 days to resolve any issues.

• Full trials to commence once ASP is producing SAS (day 48)

• Drum thickeners– Tests to identify optimum polymer dosing rate of

sludge (blend of CASS, SAS and Syngenta sludges)

– Series of trial runs to check and optimise operation of drum thickeners to be coordinated with SNF Polymer.

Timescale

Construction complete July 2009

Process commissioning July 2009

Completion date October 2009

ANY QUESTIONS ?

Huddersfield - Process Commisioning presentation 030209

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