Carbon Adsorption and Filtration System at Large Waste Recycling Facility

 

Installed/commissioned:
2018

Introduction:
Simdean Group have successfully designed, delivered, installed and commissioned a new carbon adsorption and dust filtration plant as an extension to an existing system at a large waste reception and recycling facility situated on the outskirts of Dublin, Ireland.

The Process:
The client has dedicated one of its buildings to the processing and storage of a product called SRF which is a fuel derived from domestic refuse.

SRF (Solid Recovered Fuel) is a fuel produced by shredding and dehydrating solid waste, typically consisting of combustible components of municipal solid waste such as: –
Paper and cardboard, certain plastics, fabrics, waste clothing, Tetra-Packs, waste plastics including toys, packaging and garden furniture etc.

The materials used to produce SRF (Solid Recovered Fuel) pass through a series of shredders, screens, air classifiers/density separators and magnets. Inert materials, recyclable plastics and metals are extracted from the shredded material, leaving a mix of mainly non-recyclable paper, card, wood, textiles and plastic.

Although a small proportion of these materials can be recycled the quality of these materials is compromised once they enter the residual waste stream and recovering energy from these materials is currently the best environmental option.

As a consequence of this process, fine dust, humidity and odour is produced which being airborne would escape from the building and pollute the immediate area around the factory generating complaints from the neighbourhood.

As the factory needs to operate around the clock it became essential that action was taken to reduce the level of odour emanating from the site.

The Solution:
The waste recycling company contacted Simdean Group Ltd. who were very happy to discuss the issues, survey the site, and design an appropriate extension and significant improvements to the clients existing odour control system in order to solve the odour problem.

It was agreed that the best way to accommodate the new extension and to contain the additional emissions would be to increase the volumetric capacity of the existing system from 85000 to 120000m3/hr, replace the old fan unit with two new efficient fan units complete with ABB inverter drives, extend the capacity of the existing Optiflo reverse jet filter and install an additional carbon adsorber to run in parallel with the two existing adsorbers.

The system would be served by a range of corrosion resistant GRP ductwork and system of dampers which would all be controlled automatically via a new control panel, PLC and HMI.
Included within the system is a built-in facility to enable on-going odour monitoring and testing of the carbon within the unit thereby allowing operators to determine the most cost-effective time to maintain the system and replace the activated carbon.

The Installation:
Since physical space on site was limited, Simdean agreed to install the new carbon adsorber in line with the existing two adsorbers but mount all three units on steel platforms to a height which would allow servicing of the units from below and create a much more efficient use of the available space.
Critical mechanical and electrical installations were completed within minimal shut-down periods and the system was handed over efficiently and in a timely manner.

Commissioning:
The entire system was commissioned by Simdean Group Ltd. and after trials and a running-in period the customer was very pleased with the results. Consequently, all additional odours and dust generated from the new process have been effectively contained and are treated efficiently by the system.

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