b side ▁collection ". ▁ ▁C urb side ▁collection ▁▁ ▁C urb side ▁collection ▁en comp ass es ▁many ▁subt ly ▁different ▁systems , ▁which ▁differ ▁mostly ▁on ▁where ▁in ▁the ▁process ▁the ▁rec y cl ates ▁are ▁sorted ▁and ▁clean ed . ▁The ▁main ▁categories ▁are ▁mixed ▁waste ▁collection , ▁comm ing led ▁rec y cl ables , ▁and ▁source ▁separation . ▁A ▁waste ▁collection ▁vehicle ▁generally ▁pick s ▁up ▁the ▁waste . ▁ ▁At ▁one ▁end ▁of ▁the ▁spectrum ▁is ▁mixed ▁waste ▁collection , ▁in ▁which ▁all ▁rec y cl ates ▁are ▁collected ▁mixed ▁in ▁with ▁the ▁rest ▁of ▁the ▁waste , ▁and ▁the ▁desired ▁material ▁is ▁then ▁sorted ▁out ▁and ▁clean ed ▁at ▁a ▁central ▁sorting ▁facility . ▁This ▁results ▁in ▁a ▁large ▁amount ▁of ▁rec y cl able ▁waste , ▁paper ▁especially , ▁being ▁too ▁so iled ▁to ▁re process , ▁but ▁has ▁advantages ▁as ▁well : ▁the ▁city ▁need ▁not ▁pay ▁for ▁a ▁separate ▁collection ▁of ▁rec y cl ates ▁and ▁no ▁public ▁education ▁is ▁needed . ▁Any ▁changes ▁to ▁which ▁materials ▁are ▁rec y cl able ▁is ▁easy ▁to ▁accommod ate ▁as ▁all ▁sorting ▁happens ▁in ▁a ▁central ▁location . ▁ ▁In ▁a ▁comm ing led ▁or ▁single - stream ▁system , ▁all ▁rec y cl ables ▁for ▁collection ▁are ▁mixed ▁but ▁kept ▁separate ▁from ▁other ▁waste . ▁This ▁greatly ▁reduces ▁the ▁need ▁for ▁post - collection ▁clean ing ▁but ▁does ▁require ▁public ▁education ▁on ▁what ▁materials ▁are ▁rec y cl able . ▁ ▁Source ▁separation ▁Source