Patent ID: 7527587

Claim:
A centrifugal separator, which includes: a container having an outer lower compartment, an outer mid compartment, an outer upper compartment, and an outer a top compartment; a lower chamber disposed radially inwardly of from said lower compartment by a side of said lower chamber, a mid chamber disposed radially inwardly of said mid from said mid compartment by a side of said mid chamber, and an upper chamber disposed radially inwardly of said upper from said upper compartment by a side of said upper chamber, wherein said lower compartment communicates with said lower chamber via an outlet formed in said side of said lower chamber, said mid compartment communicates with said mid chamber via an outlet formed in said side of said mid chamber; said upper compartment communicates with said upper chamber via an outlet formed in said side of said upper chamber; means for rotating said chambers wherein said chambers rotate within said compartments; said lower compartment communicates with an outlet formed in a side portion of said container for passing heavy matter residual therethrough; said lower chamber communicates with said mid chamber via a first port formed between said lower and mid chambers; said mid compartment communicates with an outlet formed in another side portion of said container which connects to a first feed line to feed effluent from said mid chamber back into said lower chamber; said mid chamber communicates with said upper chamber via a second port formed between said mid and upper chambers; said upper compartment communicates with an outlet formed in another side portion of said container which leads to an inlet to a second feed line to feed effluent from said upper chamber back into said mid chamber; and a third port formed in an upper portion of said upper chamber through which light matter residual passes to permit collection thereof.