Accession Number:

ADA235995

Title:

Sludge Dewatering in a Freezing Bed: A Pilot-Scale Study

Descriptive Note:

Corporate Author:

COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Personal Author(s):

• Martel, C. J.
• Diener, Carl J.

Report Date:

1991-04-01

Pagination or Media Count:

20.0

Abstract:

In 1986 a pilot-scale sludge freezing bed was constructed. This bed was operated over the next three years using both an aerobically and aerobically digested sludges. These tests demonstrated that both sludges can be effectively dewatered by this process. The final solid contents were 39.3 and 24.5 for an aerobically digested and aerobically digested sludges, respectively. The quality of the meltwater was similar to raw waste water. Odors were not a problem if the meltwater was drained away as quickly as it formed. Both sludges were easily removed with a front-end loader. The actual depth of sludge frozen and thawed in the bed during each year of operation was very close to that predicted by design models. Some northern water treatment plants have successfully used natural freezing thawing in their lagoons or drying beds.

Descriptors:

• *SLUDGE
• WASTE WATER
• WATER
• SOLIDS
• DEPTH
• WATER TREATMENT
• QUALITY
• ICE
• MELTING
• THAWING
• NORTH(DIRECTION)
• INDUSTRIAL PLANTS
• REMOVAL
• FREEZING

Subject Categories:

• Solid Wastes and Pollution and Control
• Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE