Method for biological purification of liquids and biological filter for purification of liquids
OwnerNina Flyaks, Alexander Shkolnikinventors
Life of this patent
Estimating the term…
Abstract
A biological filter for purification of liquids has primary filtering stages (52a, 52b, 52c) of a particulate material and secondary filtering stages (54, 56, 58) containing a fine-fiber material. The particulate material and fine-fiber material are covered with a biofloc film. The primary filtering stages (52a, 52b, 52c) and the secondary filtering stages (54, 56, 58) form a succession of filtering groups, and liquid is caused to move through the succession of filtering groups. Liquid is aerated during movement through the succession of filtering groups.
Claims44
A biological filter for purification of liquid having an inlet, an outlet and filtering materials covered with a biofloc film provided between said inlet and said outlet, said biological filter comprising:
- a plurality of primary filtering stages comprising at least two primary filtering stages, each having a bed of a particulate material;
- said plurality of primary filtering stages having a first primary filtering stage;
- a plurality of secondary filtering stages, each containing a fine-fiber material which is different from the particulate material of the primary filtering stages;
- said plurality of secondary filtering stages having a last secondary filtering stage;
- said primary filtering stages of said plurality of primary filtering stages and said secondary filtering stages of said plurality of secondary filtering stages forming a succession of filtering groups, each comprising at least one primary filtering stage of said plurality of primary filtering stages;
- means for moving said liquid between said filtering groups of said succession of filtering groups;
- means for aerating said liquid during movement of said liquid by said means for moving said liquid by aerating means provided in each of said filtering stages;
- said inlet of said biological filter being connected to said first primary filtering stage;
- and
- said outlet of said biological filter being connected to said last secondary filtering stage.
A biological filter for purification of liquid having filtering materials covered with a biofloc film, said biological filter comprising:
- a casing having an inlet and an outlet;
- at least three closed compartments vertically arranged in said casing and including a first closed compartment, each closed compartment having at least one permeable wall and a perforated mainfold beneath one of said at least one permeable wall;
- a particulate material in said at least three closed compartments;
- a plurality of secondary filtering stages in said casing including a last secondary filtering stage, each containing a fine-fiber material which is different from the particulate material of the closed compartments;
- said closed compartments of said at least three closed compartments and said plurality of secondary filtering stages forming a succession of filtering groups, each filtering group of said succession of filtering groups comprising at least one of said at least three closed compartments;
- means for aerating said liquid during movement of said liquid by said means for moving said liquid by aerating means provided in each of the filtering groups;
- said inlet of said biological filter being connected to said first closed compartment;
- and
- said outlet of said biological filter being connected to said last secondary filtering stage.
A biological filter for purification of liquid having filtering materials covered with a biofloc film, said biological filter comprising:
- a casing having an inlet and an outlet;
- a first closed compartment, a second closed compartment and a third closed compartment vertically arranged in said casing, each having at least one permeable wall and a perforated manifold beneath one of said at least one permeable wall;
- a particulate material in each of said first, second and third closed compartment;
- a plurality of secondary filtering stages in said casing each containing a fire-fiber material which is different from the particulate material of the compartments;
- a last secondary filtering stage of said plurality of secondary filtering stages;
- said first closed compartment being connected to at least one of said plurality of secondary filtering stages;
- said second closed compartment being connected to at least one of said plurality of secondary filtering stages;
- said third closed compartment being connected to one of said plurality of secondary filtering stages:
- means for moving said liquid, said means for moving said liquid being provided between one of said first, second, and third closed compartments and at least one of said plurality of secondary filtering stages, respectively;
- means for aerating said liquid during movement of said liquid by said means for moving said liquid provided in each of the filtering stages;
- said inlet of said biological filter being connected to said first closed compartment;
- and
- said outlet of said biological filter being connected to said last secondary filtering stage.
Dependencies are inferred from the claim text.