Liquid clarifier and method
AssigneePecor Corporation
InventorHerbert R. Damerau
Life of this patent
Estimating the term…
Abstract
A clarifier allowing increased fluid pressure differentials across the filter septum is arranged with one face of the septum exposed to the contaminated liquid and the opposite face exposed to the suction pressure of a pump with the discharge of the pump capable of being redirected to backflush through the filter septum, such backflushing being carried out sequentially through small area segments of the septum. The return of a flight conveyor may be moved selectively into and out of scraping or wiping relation with the filter and filter wiping and backflushing may be automatically controlled.
Claims13
A liquid clarifier comprising, in combination:
- a settling tank;
- a clean-liquid tank;
- a filter having one face exposed to liquid in the settling tank;
- a vacuum box closing the opposite face of said filter;
- a pump having a suction side and a discharge side;
- means for connecting the said suction side to the vacuum box and the discharge side to the clean-liquid tank or connecting the suction side to the clean-liquid tank and the discharge side to the vacuum box to backflush therethrough;
- 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
- positioning 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.
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 vacuum box filter exposed to liquid in the settling tank;
- a pump having a suction side communicating with the vacuum box and a discharge side communicating with 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 retuan run arranged adjacent the filters;
- conveyor guide means for selectively positioning the conveyor return run close to the filters to scrape a filter cake formed on each filter or position the return run in spaced non-scraping relation with the filter cakes;
- and
- control means responsive to clogging of at least one of the filters die causing the guide means to position the conveyor return run in filter-cake-scraping relation.
Dependencies are inferred from the claim text.