Huber Technology upgrades the Inlet Works at Duncrue Street, Belfast
Huber Technology upgrades the inlet works with coarse and fine screens, RakeMAX and EscaMAX and screenings handling units WAP-SL BG12.
A Wastewater Case Study
Huber Technology have recently completed a large £1.2 million project at Duncrue Street, Belfast. The project consisted of supply of equipment, mechanical installation and commissioning at the inlet works. Huber Technology collaborated extremely closely with the main contractor GRAHAM Construction and Northern Ireland Water to ensure the project was delivered successfully.
The successful delivery of any wastewater project, large or small, doesn't just happen, and typically involves people from many different disciplines and who are highly experienced, and very importantly have good local site knowledge. The upgrade of Duncrue Street, Belfast, was an example of the considerable collaborative effort needed from the outset to ensure a successful outcome which exceeded all parties' specifications and site requirements.
From the initial enquiry, around 3 years ago, regular dialogue took place between Northern Ireland water, the design consultant, contractor and Huber Technology.
A thorough understanding of the hydraulic conditions of the site where of the utmost importance. The elevated works, which occupy a compact footprint, fed by 5-off large screw pumps presented its challenges, and any failure in the fundamental design could have caused extensive damage to the surrounding area.
The existing 6-off coarse and 6-off fine screens on site, along with their associated dedicated (very long) screw conveyors and handling equipment, were continually causing issues with carryover of screenings, leading to reliability problems and requiring high maintenance. This compounded with the high peaks of loadings in respect of flow and rags meant that the operation of the works involved large amount of manpower and monitoring to take place.
Huber Technology were tasked to take into account the very specific site hydraulics and control philosophy requirements for this site along with the right selection of equipment and its associated sizing. The coarse screens chosen were used to protect and reduce the solids loading onto the 6mm escalator screens, which have one of the highest screenings capture ratios on the market today of 84%. This would ensure that pump blockages and rags were not carried over into the works. Additionally Huber Technology suggested that a launder system be utilized to eliminate the need for the very complicated and maintenance intensive screw conveyors and duty/standby change over systems.
As with all projects of this scale, good communication was essential, and regular projects meetings at all stages of the contract, ensured that all parties were informed and agreements about the most important decision were made collectively. The well-known 5-P's acronym (proper, planning, prevents, poor, performance) was particularly relevant in this case.
Scope of supply
Huber Technology supplied;
· 6 x EscaMax Screen 5000 x 2252 with 6mm perforated plate
· 6 x RakeMax Screen 4300 x 2250 with 50mm bar spacing
· 4 x WAP-SL BG12
· All launder channels
· DN350 knifegate valves
· EscaMax Screen throughput 2100 l/s peak flow per screen (5-off duty screens
and 1 standby)
· RakeMax Screen throughput 2100 l/s peak flow per screen (5-off duty screens
and 1 standby)
· WAP SL max throughput of 15m3/hour per unit (Duty / Standby - Coarse
Screens and Duty / Standby Fine Screens)
· Launder Channels for a flow rate of 25 l/s
To keep the existing works active, a phased installation of new equipment was essential, and the equipment had to also fit within the existing very tight sites hydraulic constraints.
The equipment was delivered directly to site, where Huber Technology's regional office, based in Portadown, took over the mechanical installation and commissioning. The use of local resource proved invaluable and ensured that the project moved forward and any issues were quickly resolved. In October 2013, the equipment was successfully commissioned after a 28 day testing.
"Having a strong local presence with a dedicated team and skilled technicians able to deliver this to a consistent high standard of workmanship ensures the project is delivered on time with the highest quality to the client. Huber Technology is a global company with a local presence, the client has a local contact and this means project delivery of any size or complexity can be delivered with minimal fuss. Duncrue Street, Belfast will be supported throughout its lifetime by the local regional team with prompt response and support to the end user" commented Kieran Hagan, Regional Field Manager for Huber Technology, Ireland
Fred Neumann, Regional Sales Manager for Huber Technology also explained "The complexities of this major project were successfully minimized and overcome, due to early engagement with NIW operations project manager, consultants, main contractor and their subcontractor. Installation phasing and commissioning problems had minimum impact on the project delivery. This was down to the integrity and commitment of the local Huber Technology installation team."
"In January 2013 Huber Technology were appointed as a sub- contractor to GRAHAM Construction to supply and install 6 No new course and fine screens at Belfast WwTW under the IWWF Phase 2 Base Maintenance scheme. Works commenced on site in July 2013 and were successfully handed over to NI Water in May 2014. The quality of product, workmanship and co-operation provided by Huber for this scheme was of a very high standard." explained Gerard
Mc Keever, Project Manager for GRAHAM Construction
Peter Neeson, Operations Manager from Northern Ireland Water explained how well he felt the project was carried out and the improvements they are seeing:
"The reliability of the Huber equipment has been excellent giving just minor teething problems which have been addressed and sorted effectively by both Huber Technology and the main contractor GRAHAM Construction
The screening capture rate, by both the coarse and fine sets of screens is excellent, evident now by how quickly the skips fill, and the significant reduction in sewage related debris downstream of the screens. This has meant less pumping and treatment process problems for myself and break downs for Northern Ireland Water M&E. Prior to the new Huber screening system being installed the old one used to pass forward into the works large amounts of sewage debris which often settled out with the sludges .This issue drew complaints of pump blockages etc. from the sludge incinerator team (previously NIW now Veolia water) and NIW M&E. Pump blockages are rarely an issue now on site.
Screening handling has been vastly improved by the installation of the Huber WAPs and launder trough system. It replaced a screw conveyor and compaction units which were housed in a purpose built building, this made the maintenance of the old units a dirty and sometimes dangerous job because of space and lighting issues. The WAP's seem to be well capable of dealing with plug flows of screenings that occur from time to time. Belfast WWTW catchment is fairly flat, so in wet weather screenings can arrive at the works on mass after a dry spell. The new WAP's seem to be very good at dealing with this".
> EscaMax - Belt Screen versatile inlet screen
> Excellent separation efficiency due to its perforations
> Reliable cleaning of the perforated plates with a rotating brush
> Very compact system with minimum space requirements
> Easy to retro fit into existing channels
> RakeMax - Multi Rake bar Screen
> Very high screenings discharge capacity
> Low headloss
> Low installation height above ground level even in deep channels
> Control independent safety system
> WAP-SL- Superior launder Wash Press
> Volume, weight and disposal cost reduction of up to 85%
> Compaction up to 50% DR
> High washed screenings quality of < 20mg BOD 5/g DR
> Feeding through a launder channel or directly from a screen or conveyor