Denitrification system
An improved multi-stage treatment system is described for biological denitrification of and suspended solids removal from water which comprises: a biological reactor, an aeration chamber and an automatic backwash filter, the reactor including a tank having a lower tank portion, a central tank portion and an upper tank portion, influent distribution means positioned in the lower tank portion, rigid media in the central tank portion capable of supporting denitrifying bacterial growths, and a plurality of collectors positioned in the upper tank portion, the collectors each including an outlet pipe, the chamber having a lower chamber portion, a central chamber portion and an upper chamber portion, aeration means positioned in the lower chamber portion, the outlet pipes of the collectors discharging into the lower chamber portion, and chamber outlet means associated with the central chamber portion, and the filter having a lower filter portion, a central filter portion, an upper filter portion and an effluent channel portion, the filter being divided into a plurality of seriate rectangular cells containing filter media, the chamber outlet means being associated with the central filter portion by which liquid contained in the aeration chamber may discharge into the filter to be filtered through the filter media, a separate port in each the cell beneath its the filter media for discharging filtered liquid from and charging backwash liquid to the respective the cell, the effluent channel portion being common to the plurality of the separate ports that all communicate with the effluent channel portion through a longitudinal planar surface in which the separate ports are substantially equally spaced apart a predetermined distance, and back washing means including a pump for forcing back washing liquid through the separate ports, a backwash shoe that slides along the planar surface to access the separate ports and motor.
- Assignee:
- Infilco Degremont Inc., Richmond, VA (United States)
- Patent Number(s):
- US 5232585; A
- Application Number:
- PPN: US 7-688472
- OSTI ID:
- 6436997
- Resource Relation:
- Patent File Date: 22 Apr 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BIOREACTORS
DESIGN
SOLIDS
DENITRIFICATION
BACTERIA
FILTERS
GROWTH
SOLID SOLUTIONS
WASTE PROCESSING
WATER REMOVAL
CHEMICAL REACTIONS
DISPERSIONS
MANAGEMENT
MICROORGANISMS
MIXTURES
PROCESSING
REMOVAL
SOLUTIONS
WASTE MANAGEMENT
560300* - Chemicals Metabolism & Toxicology