Administrative Code

Creating a Report: Check the sections you'd like to appear in the report, then use the "Create Report" button at the bottom of the page to generate your report. Once the report is generated you'll then have the option to download it as a pdf, print or email the report.

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

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.

Website addresses provided in the Virginia Administrative Code to documents incorporated by reference are for the reader's convenience only, may not necessarily be active or current, and should not be relied upon. To ensure the information incorporated by reference is accurate, the reader is encouraged to use the source document described in the regulation.

As a service to the public, the Virginia Administrative Code is provided online by the Virginia General Assembly. We are unable to answer legal questions or respond to requests for legal advice, including application of law to specific fact. To understand and protect your legal rights, you should consult an attorney.