Aerated grit chamber and method

Details Aerated grit chamber and method Aerated grit chamber and method

2005-07-26

2005-07-26

Barry, Chester T. (Department: 1724)

Liquid purification or separation

Processes

Separating

Reexamination Certificate

active

06921489

ABSTRACT:
An aerated grit chamber includes an aeration zone in which influent is vigorously aerated and a settling zone separated from the aeration zone by a baffle beneath which wastewater flows from the aeration zone into the settling zone. The aeration causes swirling motion and causes larger grit particles to settle and accumulate in a grit trough on the floor. An inclined plate settler in the upper part of the settling zone causes smaller grit to settle and fall into the grit trough. In order to prevent overly efficient operation at low flow rates and settling of organics with the grit, internal recycling of the wastewater from the settling zone back into the aeration zone is effected, preferably with air lift to induce recycling but also using alternative techniques such as direct pumping.

REFERENCES:
patent: 4303516 (1981-12-01), Stensel et al.
patent: 4532038 (1985-07-01), Reid
patent: 5908040 (1999-06-01), Defraites, Jr.

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