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Chapter: Civil - Municipal Solid Waste Management - Offsite Processing & Storage

Full stream processing technique

This is a high technology separation technique, which processes all components of municipal waste.


Full stream processing technique

 

This is a high technology separation technique, which processes all components of municipal waste. The materials recovered by this process tend to be of lower quality than those recovered or source separated in MRF because the former is a mix  of  various  types  of  wastes.  To  achieve  a  better  quality,  the  materials obtained through the full stream processing must be cleaned, which is a costly process. However, this technique remains attractive because it does not require source separation, and it isused in the following applications:

 

(i) Refuse derived fuel (RDF) preparation: In this application, it is used to extract the

 

combustible portion of munic ipal waste.

 

(ii) Municipal  waste  comp osting: In   this   application,   it   is   used   to concentrate

 

the compostable portion of m unicipal solid waste. Note that this is sometimes performed

 

as part of RDF preparation.

 

(iii) Material  recovery:  In  this  application,  it  is  used  to  recover  and  resell certain

 

materials, and thereby makin g material recovery a recycling technology as  well. In  full

 

stream processing, dependin g on the facility design, the materials are separated either mechanically or by hand, and size and weight are the main characteristics used to

separate the materials.

 

  when the material is dumped, oversized materials such as furniture, etc., are removed;

 

  rotating screens are used to separate materials of different siz es (small and large);

 

    ferrous material is extracted using a magnet system;

 

    air classifier is us ed to separate the lighter material;

 

  light materials including plastic and paper are further processed into  RDF;

 

heavy  fraction  is mechani cally or manually  sorted  to  recover   sale able materials such as cardboard, etc.  

 

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