Scavenge

scavenge [ SKAV-inj ]
[ intransitive verb, transitive verb ]

MEANING :
1. (tr. v.) to search through and gather from wastage
2. (tr. v.) to expel exhaust gases from the cylinder of an internal-combustion engine
3. (tr. v.) to remove impurities from molten metal by chemicals
4. (intr. v.) to search through refuse
5. (intr. v.) to feed on dead or decaying matter

USAGE EXAMPLE 1 :
The children scavenged the city dump for material to use in their science project.

USAGE EXAMPLE 2 :
Yasar told Sahintas he scavenges packing paper and cardboard boxes from garbage bins for resale to private recycling companies.