Bentonite Clay Body Feed
A body feed, such as bentonite clay, can be added to waste water when it is difficult to form an adequate floc. Poor floc formation can occur when the waste water is low in suspended solids. Without proper formation of floc particles, the undesirable constituents of the waste water such as solids, oil, grease, heavy metals and color are not removed as desired. A typical body feed is bentonite clay. A bentonite body feed will add solids and assist in the formation of floc particles. The floc particles will attach to solids, oil, grease and heavy metals which can then be removed. The body feed is generally added first before the addition of coagulants and flocculants in a fast, high shear mixing tank to ensure distribution throughout the waste water stream.
TCLP (Toxic Characteristics Leachate Procedure)
In addition, a bentonite body feed is very effective at encapsulating heavy metals during flocculation. When heavy metals are encapsulated the resulting sludge can help to hold the heavy metals preventing them from leaching. This is important for passing the TCLP (Toxic Characteristics Leachate Procedure) test required by landfills for acceptance of the waste sludge.