ASK Piearcey


Odour Control Systems – One of UK’s Largest Sewage OCUs

A.S.K. Piearcey Ltd were engaged by their exclusive waste-water treatment partners Plasticon UK, to carry out the process design and flow balancing of  a flag ship odour control plant situated on the South Coast.

The system handles up to 250,000 m3/hr of odorous air from the main plant and there 2 further satellite systems handling approximately 3000 m3/hr each.

ASKP Ltd provided the process design based on a concept from the main process consultant. The system comprised venturi scrubbing for dryer off-gas solids removal and acid scrubbing for ammonia removal. This was followed by caustic-hypochlorite scrubbing and final carbon adsorber polishing.

Venturi Separator Sump

Venturi Separator Sump

 

The venturi system handled up to 19100 m3/hr of dryer off-gas but had 2 modes of operation with automatically varied flow control set point and alarm level adjustment. The venturi throat could be varied by means of an adjustable throat plunger and worked on a constant overflow of final effluent from the separator vessel (above).

Acid Scrubber

Acid Scrubber

The Acid scrubbers handle around 47,000 m3/hr of the high odour (from direct coupled extracts) and are there primarily to remove ammonia and some of the amine present.

Hypo-Caustic Scrubbers

Hypo-Caustic Scrubbers

The Hypo-Caustic Scrubbers handle the entire air flow at 250,000 m3/hr and can temporarily handle this with just 2 of the 3 duty scrubbers in operation

 

Carbon loading unit

Carbon loading unit

The 3 carbon units held around 125 tonnes of copper oxide impregnated carbon to fine tune the odour control performance of the system. Each had to be loaded with a specially built carbon loading system (above).

The air was conveyed from the various field extract points via a vast network of ducting.

Field Process  Odour Extract

Field Process Odour Extract

3m diameter Combined Exhaust to Stack

3m diameter Combined Exhaust to Stack

 

The ducting was fabricated up to 3m internal diameter to meet the agreed velocity consents.

Carbon adsorber units, also containing copper oxide impregnated carbon were used for odour control in satellite pumping stations.

The system below shows a system with duty standby extract fans and local control panel.

Odour Control Unit at Satellite Pumping Station

Odour Control Unit at Satellite Pumping Station

The Entire project value was circa £6.5 million. ASKP also assisted with HAZOP, HAZChem and commissioning. We provided Detailed Design, Operational instructions, Control Philosophy, commissioning schedule and training for the entire odour control system.

Fan Pressure Testing by ASKP Ltd

Fan Pressure Testing by ASKP Ltd

 

 

 

 

 

 

 

 

 

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Jet Venturi Removes Chlorine and Solids
May 26, 2011, 12:09 pm
Filed under: News | Tags: , , ,

Removing Chlorine and Solids

ASK Piearcey designed, project engineered and commissioned a single stage jet venturi scrubber with carbon polisher.

The jet venturi unit was manufactured by Transvac Systems Ltd and the whole system was installed by EIS UK Ltd The system removes high concentrations (13,000ppm) of chlorine  from hot reactor exhausts as well as entrained solids.

The system uses a caustic dosing system to regulate liquor pH. The Jet venturi provides the neccessary motive force to overcome its own pressure drop and that of the down stream adsorber set.



Fume Abtement Success
May 26, 2011, 12:04 pm
Filed under: News | Tags: , , , , , ,

Fume Abtement Success

ASK Piearcey designed, managed and commissioned a laser cutter fume system to replace some old and expensive to run units.

A single carbon adosrber with 2 stage pre-filtration has reduced filter changes from daily to every 3 weeks and carbon changes from every 2 days to once annually (not changed as yet). Estimated cost savings >£10k per annum excluding the cost of down time.

The system treats approximately 800m3/hr of fume containing up to 25ppm HCl and VOC from the PVC sheet as it is laser cut.