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Two recycling solutions from CDEnviro have improved efficiency and reduced costs for Irish Waste in the past 2 years.
Belfast company, Irish Waste, have a forty year history in waste management in Northern Ireland. They provide industrial and commercial waste services as well as treatment and recycling of a range of waste streams including hazardous and non-hazardous materials. Their focus is on developing processes and facilities to direct wastes from environmentally irresponsible disposal outlets and concentrate on waste reduction, recycling, recovery and reuse.
Over 90% of the waste treated by Irish Waste is recovered or recycled, and CDEnviro technology is an important part of this process.
Street Sweepings and Road Gully Waste
In 2013 Irish Waste approached CDEnviro about developing a recycling system to process and treat its street sweepings and gully waste material collected from around Northern Ireland. The company collects around 12,000 tonnes of this material per year which had been going to landfill. With the increasing cost of landfill, a solution was required that would significantly reduce the volume, and therefore, cost, of disposal.
Irish Waste took delivery of their new system in August 2014. It included a HYDRO:GRADE which encompasses a series of techniques including a 2-stage density separation process, attrition and high pressure wet processing. The recycling system diverts up to 90% of waste material from landfill
Re-Use of Recovered Products
The HYDRO:GRADE offers superior separation of lightweight and fine constituents, through a series of density separation techniques, ensuring the highest quality end products. For Irish Waste, these products are a 5-40mm aggregate, 0-4mm fine aggregate and an organic fraction.
“The end products are being used in a variety of construction applications including trench fill, pipe bedding and non-structural concrete mixes.”
The system ensures Irish Waste can offer a total street sweepings recovery service, including dewatering, screening out larger items and washing the remaining sweepings to produce a clean material for the construction industry, that is fully compliant with the quality protocol.
“This processing system is one in a very long line of innovations for Irish Waste. We have been championing innovation since our incorporation in 1971. Our long history of improvement includes our design, build and operation of the first articulated high flow jet vac units to the UK in 1985; and the development of the first underground CCTV and sewer tracing units in 1989. 2014 was another pioneering achievement for us with the installation of the CDEnviro bespoke road gully and street sweeping recycling facility” explains Jason McPolin.
Pond Cleaning - A Second Investment
When Irish Waste visited CDEnviro Headquarters in August 2014 for a factory acceptance test of their road sweepings system, Jason McPolin saw a PRO:DEC system in the CDEnviro production facility. The PRO:DEC is a cost effective and efficient sludge degritting system that minimises abrasion and deposition problems in wastewater processes. Mr McPolin identified it as a possible solution to Irish Waste’s sludge problems with lagoons on one of their projects in Lurgan. The lagoons were 500,000m3 and were in insitu for over 30 years. Irish Waste’s requirement was a solution that would remove oversize and grit from the sludge to allow it to go through a decanter for final treatment. The result was the first ever PRO:DEC provided by CDEnviro.
In 2015, after 18 months of operation, the PRO:DEC completed processing at the Lurgan site, having processed 500,000m3 of sludge from the ponds. “The Pro:Dec dramatically reduced wear and tear to the decanter, saving in the region of £70-80k”. After treatment in the PRO:DEC, the degritted sludge then went through the on-site decanter for dewatering. As part of their stabilisation process, the site added Bio Lime to the dewatered sludge, causing a temperature rise to 70 degrees C which pasteurises the sludge, reducing pathogens such as salmonella and e.coli and reducing unpleasant odours. The remaining product was used as an effective organic fertiliser or soil ameliorant. This product was then spread on the land previously used to accommodate the lagoons, to remediate the land and make it suitable for local wildlife.
A Complete Solution
Once work was completed on the ponds, the PRO:DEC was placed on a trailer to begin mobile processing at various sites around Northern Ireland. As a result, Irish Waste can provide a complete sewage treatment service, receiving sewage sludge, screening any large contaminants and processing the sludge through centrifugation to produce a filter cake which can be applied as a fertiliser, returned to the client or disposed of. All sludge recovered can be removed and treated on-site using a mobile de-canter unit that provides a dewatering and stabilising process that safely treats sludges and other organic wastes. “The unit can process the sludge output of a plant serving a population up to 150,000, processing between 5-125 cubic metres per hour with 5% solids content” explains Mr McPolin.
Further information on Irish Waste can be found on their website http://www.irishwaste.net/