Digester cover left-in-place ballast ring
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United States of America Patent
Stats
-
Nov 15, 2022
Grant Date -
Apr 1, 2021
app pub date -
May 14, 2020
filing date -
May 18, 2017
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A sludge digester including a vessel and floating cover. The vessel includes a sidewall and an interior volume configured to receive and contain sludge. According to one embodiment, the cover comprises a frame structure that is constructed and arranged to form a skirt member formed at a periphery of the cover and extending downwardly into the vessel, and a continuous ballast ring attached to a lower portion of the skirt member and configured to form a trough member with an interior surface of the skirt member. The sludge digester may also include a guide system coupled to the sidewall and the skirt member and configured to allow vertical displacement of the cover with change in volume of at least one of a gas and a sludge contained in the vessel beneath the cover.
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