R

2000-10,000 SS

Polyelectrolyte

Notes: *Pressurization System Type P = Partial flow T = Total flow R = Recycle flow

**In nonrecycling flotation units, it is the maximum influent rate per unit of tank surface area.

Notes: *Pressurization System Type P = Partial flow T = Total flow R = Recycle flow

**In nonrecycling flotation units, it is the maximum influent rate per unit of tank surface area.

alum, ferric chloride, lime, and various polymeric compounds to form stable floc particles or break oil emulsions. These chemicals are usually added to pretreatment flash mixers and flocculators ahead of the flotation unit. The chemically treated wastewater then flows by gravity to the flotation system where gas is added by recycle-flow pres-surization. Full- and partial-flow pressurization systems are infrequently used because the floc structure in the chemically treated wastewater degrades in the pressurization system and does not reform in the flotation unit.

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