(best examples and good practices) on household organic waste ...
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(best examples and good practices) on household organic waste ...

(best examples and good practices) on household organic waste ... (best examples and good practices) on household organic waste ...

uest.gr
11.11.2014 Views

75 (Table 6.): Typical floating velocities for various components of shredded mixed waste (Tchobanoglous ong>andong> Kreith., 2002) Air classification serves respectively to: 1. Remove light organic matter entrained with the ferrous metal; ong>andong> 2. Separate light aluminum from heavier aluminum castings, copper, bronze etc. 4.6.5. Magnetic Separation (Ferrous Materials) The contents of waste material which can be magnetized are normally separated using overhead magnetic separators (Figure.23). Besides tin plate many combined materials with a large variety of particle shape are contained in the household waste material. This leads to a strongly polluted scrap product. Good possibilities exist to clean this material using magnetic separators with

76 changing pole configuration or with rotating vertex. Although, due to cost reasons these technologies are used only rarely. Figure.23.: Magnetic Separation If the fine fraction of the waste material is to be biologically treated a widely separation of ferrous metals ong>andong> combined materials is necessary. Due to the difficult material conditions a recovery of 95% is not possible in many cases. Furthermore, a lot of combined materials based on metals can be found such as batteries which cannot be separated using conventional magnetic fields. (Wastesum.,2010) 4.6.6. Eddy-current separation (Non Ferrous Materials) The most important non-ferrous metal contained in household waste material is aluminum which can be found in the form of cans, different packaging or e.g. as bottle caps. The eddy current unit (Picture 8.) operation separates aluminum products from other nonmetals. An aluminum separator employs either a permanent magnetic or electromagnetic field to generate an electrical current (eddy), which causes aluminum cans (nonferrous) to be ejected ong>andong> separated from other materials. Eddy current separation is based on the use of a magnetic rotor with alternating polarity, spinning rapidly inside a nonmetallic drum driven by a conveyor belt.

75<br />

(Table 6.): Typical floating velocities for various comp<strong>on</strong>ents of shredded mixed <strong>waste</strong><br />

(Tchobanoglous <str<strong>on</strong>g>and</str<strong>on</strong>g> Kreith., 2002)<br />

Air classificati<strong>on</strong> serves respectively to:<br />

1. Remove light <strong>organic</strong> matter entrained with the ferrous metal; <str<strong>on</strong>g>and</str<strong>on</strong>g><br />

2. Separate light aluminum from heavier aluminum castings, copper, br<strong>on</strong>ze<br />

etc.<br />

4.6.5. Magnetic Separati<strong>on</strong> (Ferrous Materials)<br />

The c<strong>on</strong>tents of <strong>waste</strong> material which can be magnetized are normally<br />

separated using overhead magnetic separators (Figure.23). Besides tin plate<br />

many combined materials with a large variety of particle shape are c<strong>on</strong>tained in<br />

the <strong>household</strong> <strong>waste</strong> material. This leads to a str<strong>on</strong>gly polluted scrap product.<br />

Good possibilities exist to clean this material using magnetic separators with

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