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Digestor Do-Over

by Richard C. Guglomo, Regional Chf. Engr.; Kennedy/Jenks/Chilton, 3301 9th Ave. South, Federal Way, WA 98003,
Milton D. Larsen, Sanitary Engr.; Kennedy/Jenks/Chilton, 3301 9th Ave. South, Federal Way, WA 98003,


Serial Information: Civil Engineering—ASCE, 1987, Vol. 57, Issue 12, Pg. 48-49


Document Type: Feature article

Abstract:

Digesters at 6 Orange County (Calif.) wastewater treatment plants needed drastic odor control rehabilitation. Repairs included epoxy patching to cracked domes, installation of a geomembrane liner inside and an insulation liner outside the dome and construction of a new mixing system to resist surface scum build-up. The insulation was flexible to bend with the temperature variance across the dome surface. Repairs extended digesters' lives by 30 years. Total repair cost: $5 million. Much saved over replacement cost of $18 million.

Subject Headings: Domes (structure) | Wastewater treatment plants | Waste treatment | Linings | Building insulation | Benefit cost ratios | Temperature effects

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