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Virginia Administrative Code
Title 9. Environment
Agency 25. State Water Control Board
Chapter 790. Sewage Collection and Treatment Regulations
12/21/2024

9VAC25-790-640. Centrifuges.

Successful application of centrifugation similar to sludge thickening applications for dewatering of municipal type sludges requires consideration of certain design factors. Proper scale-up data pertaining to the particular sludge to be dewatered and the necessary polymer and coagulant dosage to achieve the design solids content shall be provided. The abrasiveness of each sludge supply shall be considered in scroll selection. Adequate sludge storage shall be provided for proper operation.

1. Unless dual trains are provided, the following spare appurtenant equipment shall be provided, with necessary connecting piping and electrical controls to allow easy installation:

a. Drive motor.

b. Gear assembly.

c. Feed pump.

2. Each feed pump shall be variable speed. A pump for each centrifuge shall be provided within the feed system.

3. Each centrifuge shall be equipped with provisions for variation of scroll speed and pool depth.

4. A crane or monorail shall be provided for equipment removal or maintenance.

5. Provision for adequate and efficient wash down of the interior of the machine shall be an integral part of the design.

Statutory Authority

§ 62.1-44.19 of the Code of Virginia.

Historical Notes

Former 12VAC5-581-700 derived from Virginia Register Volume 18, Issue 10, eff. February 27, 2002; amended and adopted as 9VAC25-790-640, Virginia Register Volume 20, Issue 9, eff. February 12, 2004.

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