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US 4,394,272 AGranted
Liquid clarifier and method
AssigneePecor Corporation
InventorHerbert R. Damerau
Life of this patent
Estimating the term…
Abstract
Method and apparatus for clarifying liquids wherein a flight conveyor in the settling tank has a forwarding run for removing sludge from the bottom of the tank and a return run which is selectively moved into and out of wiping cooperation with a filter between the settling tank and a clean-liquid tank, and a filter backwasher in the clean tank is selectively operable to progressively backwash the filter, and both the wiping and backwashing being accomplished in accordance with the clogged condition of the filter.
Claims17
A liquid clarifier comprising, in combination:
- a settling tank;
- a clean-liquid tank;
- a filter between the tanks through which liquid flows from the settling to the clean-liquid tank;
- a flight conveyor in the settling tank having a forwarding run arranged to scrape the bottom of the settling tank and move sludge to a discharge chute and a return run arranged adjacent the filter;
- and
- means for selectively positioning the conveyor return run either close to the filter to scrape a filter cake formed thereon or position the return run in spaced non-scraping relation.
3 more elements
A liquid clarifier comprising, in combination:
- a settling tank;
- a clean-liquid tank;
- a filter between the tanks through which liquid flows from the settling to the clean-liquid tank;
- a flight conveyor in the settling tank having a forwarding run arranged to scrape the bottom of the settling tank and move sludge to a discharge chute and a return run arranged adjacent the filter;
- conveyor guide means for selectively positioning the conveyor return run close to the filter to scrape a filter cake formed thereon or position the return run in spaced non-scraping relation with the filter cake;
- and
- means for sensing clogging of the filter and connected to said conveyor guide means to cause the guide means to position the conveyor return run in filter-cake-scraping relation when the clogging reaches a predetermined amount and cause the guide means to position the return run away from the filter cake when the clogging is reduced.
4 more elements
A liquid clarifier comprising, in combination:
- a settling tank;
- a clean-liquid tank;
- a filter between the tanks through which liquid flow from the settling to the clean-liquid tank;
- a flight conveyor in the settling tank having a forwarding run arranged to scrape the bottom of the settling tank and move sludge to a discharge chute and a return run arranged adjacent the filter;
- conveyor guide means arranged to position the return run of the flight conveyor either close to the filter to scrape a filter cake formed thereon or spaced from the filter in a non-scraping position;
- filter backwash apparatus connected to a source of liquid under pressure and including nozzle means supported adjacent the filter on the clean tank side thereof for backwashing through the filter toward the settling tank side;
- and
- means responsive to the clogging and unclogging of the filter and connected to the conveyor guide means and to the backwash apparatus to operate the same in response to the condition of the filter.
5 more elements
The method of clarifying a liquid comprising:
- delivering the liquid to a settling tank;
- holding the liquid in the tank to allow contaminates to settle therefrom;
- removing sludge from the tank by arranging a flight conveyor so that a forwarding run scrapes the bottom of the tank;
- moving liquid in the settling tank through a filter into a clean tank;
- shifting the return run of the flight conveyor into and out of scraping relation with the filter in accordance with the clogged condition thereof;
- and
- selectively backwashing through the filter with liquid in the clean tank.
4 more elements
A liquid clarifier comprising, in combination:
- a settling tank;
- a clean-liquid tank;
- a filter between the tanks through which liquid flows from the settling to the clean-liquid tank;
- a flight conveyor in the settling tank having a forwarding run arranged to scrape the bottom of the settling tank and move sludge to a discharge chute and a return run arranged adjacent the filter;
- conveyor guide means arranged to position the return run of the flight conveyor to scrape a filter cake formed on the filter;
- filter backwash apparatus connected to a source of liquid under pressure and including nozzle means supported adjacent the filter on the clean tank side thereof for backwashing through the filter toward the settling tank side;
- said conveyor guide means being shiftable to move the return run of the flight conveyor away from the filter to a non-scraping position;
- and
- control means coupled to the conveyor guide means and to the filter backwash apparatus for selectively operating them in accordance with the clogged condition of the filter.
6 more elements
The method of clarifying a liquid comprising:
- delivering the liquid to a settling tank;
- holding the liquid in the tank to allow contaminates to settle therefrom;
- removing sludge from the tank by arranging a flight conveyor so that a forwarding run scrapes the bottom of the tank;
- moving liquid in the settling tank through a filter into a clean tank;
- and
- shifting the return run of the flight conveyor into and out of scraping relation with the filter in accordance with the clogged condition thereof.
3 more elements
Dependencies are inferred from the claim text.