Recycling & Waste Management
Separated supermarket food packaging
Recovered kitchen/ restaurant food waste
Turbo Separator system
feedstock and the quantity of organics car- ried over with the separated packaging. The smaller the screen size the cleaner the feedstock and higher the organic mate- rial content of the separated packaging. The amount of organics found in the packaged waste after separation is also effected by the size of the dry solids content of the organic fraction. The larger the size of the organic solids, the higher the or- ganic content of the separated packaging will be, using this method of separation. The organic carryover must be kept to a minimum, as not only are you loosing it as a fuel source, but paying to dispose of it. With some packaged materials, the organic content found in with the pack- aging after separation was greater than 20% using this method of depackaging. Shredding the materials prior to separa- tion makes it more diffi cult to achieve the high separation effi ciencies required by anaerobic digestion plants. The greater the size difference achieved between the packaging and contents the easier it is to separate them effi ciently. The Atritor Turbo Separator is designed to open the packaging just enough to al- low the contents to be removed. Keeping the size differential as large as possible
between the packaging and the organic contents allows high separation rates to be achieved using relatively low power when compared with the alternatives. Both packaged dry and liquid materi- als can be effi ciently separated using the Turbo Separator method of separation. The Atritor Turbo Separator, utilising centrifugal forces and the mechanical action generated by the paddle system, dam- ages the packaging just enough to achieve separation rates of up to 99% effi ciency. The results taken from a sample of re- covered material (feed stock) which had been separated from packaged mixed supermarket food waste using a TS3096 Turbo Separator system were as follows:
0.56% 16.84%
Inert Content Plastic Films
Plastic Particles Stones Glass
Metals Inert Material <2mm 5mm
0.01% 0% 0% 0% 0% -
Dry Matter Contents Total Inert Contents
2mm - 5mm 0.01% 0%
0.03% 0% 0%
0.51%
Kitchen waste before separation
The total sample size collected was 20kg and the analysed sample size was 1.272kg. The organics were removed from the solids content by dissolving and fl ushing the material in three separate stages which consist of three hour, four hour and six hour process periods to reveal the inert contents. The analysis was conducted by a company independent from either Atri- tor or the anaerobic digestion plant where the sample was taken. Atritor has supplied over 80 Turbo Sepa- rator systems separating a wide range of packaged materials to waste companies, AD plants, composting companies, rendering companies, animal feed companies, food manufacturers and secure destruction plants. The fi rst TS42120 model Turbo Separator has recently been supplied to an anaerobic digestion company based in Canada; they are achieving separation rates of over 20 tonnes/hr of mixed packaged food waste. A number of AD Plants using this depack- aging technology already have or are in the process of achieving PAS110. ■
For more information contact Atritor on tel: +44(0) 2476 662266 or visit:
www.turboseparator.co.uk
www.solidsandbulk.co.uk Solids and Bulk Handling June 2012 13
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