Offsetting environmental and biosecurity issues whilst providing cost benefits by managing waste on the island.
In 2006, Addfield-Techtrol installed a 1000kg per hour medical waste treatment plant on the Isle of Man, UK. The plant was integrated into the existing municipal waste site and conceived to manage a wide variety of hazardous waste streams that included clinical waste, animals, and sewage filtering. The machine was designed and built specifically based on the unique customer requirements.
The business case for implementation of the plant was further enhanced by supplementing the burn process with waste oil. However, the key drivers for the plant were to offset the environmental aspect and cost associated with transportation of waste off the island, whilst minimising the biosecurity risks of waste movement.
The C1000 thermal treatment plant consists of a fully automated incineration line. Incoming wheelie bins are fitted with a data information tag. Nine bins would be loaded onto the automated bin rail. As bins automatically transverse down the bin rail, the bins tags are read and the waste type is identified. The bin is then weighed, picked up, inverted and the waste is emptied into the loading hopper for the hydraulic ram charger system. The wheeled bin is then placed down and automatically re-weighed to confirm its contents have been completely emptied. The emptied bin is then automatically manoeuvred to a bin washer system where it is opened, inverted and thoroughly cleaned inside and out, with steam. Waste steam is then extracted and fed back into the incinerator to remove any odours and hazards from the bin washing process. This whole process continues to repeat itself until the computer algorithm confirms that the hourly burn rate has reached its maximum.
The primary incineration chamber is fed from the hydraulic loader. It consists of a fully bricked stepped hearth with a multi-point hearth sweeping system. The chamber is continually de-ashed with an automatic de-ashing system that deposits ash into a receiving wheeled bin.
The secondary after chamber provides a two second retention time at a minimum of 1100 deg.C. It is designed to thoroughly oxidise flue gas and is the first stage of the gas cleaning system. This chamber is also fitted with an SNCR de-NOx kit. This unit was fitted as a precaution but never used as the combustion process proved to be extremely efficient. Oxygen sensors on the secondary chamber ensure 6% oxygen output.
A transit duct connects the secondary chamber to a 4000kw thermal recovery boiler – after which it is passed to the main municipal waste sites flue gas filtration system.
PLC controls are available at various stations around the plant. These stations are all networked; as such, the site is controlled principally from the main control room that has complete feedback of all possible variables.
The clinical waste system is still in operation today, some many thousands of cycles later.
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