US 12,623,939 B2 · Biofilter with shaped underdrain assembly

Abstract

An improved biofilter design and related methods of utilizing shaped drain assemblies for directing fluid flow though a biofilter media to promote biological interaction. A shaped drain assembly can include a plurality of elongated drain structures having a permeable upper surface, a. lower surface and a drain interior defining a drain cross-section. When configured as a shaped underdrain assembly, each elongated drain structures can be in proximity to a biofilter tank floor such that the lower surface is in fluid communication with one or more flow channels below the floor and with the permeable upper surface supporting the biofilter media. The biofilter can include a shaped drain assembly positioned above the shaped underdrain assembly and located within or above the biofilter media. The shaped drain assemblies can control the flow and mixing of two or more flow species into the biofilter media.

Claims22

Dependent claims

A biofilter system, comprising:

a tank defining a floor surface;
a media bed;
one or more flow channels defined below the floor surface;
a shaped underdrain assembly including a plurality of elongated underdrain structures positioned on the tank floor, each elongated underdrain structure having a flume plate residing within the one or more flow channels, each elongated underdrain structure having a permeable upper surface, a lower surface in fluid communication with the flume plate and an underdrain interior so as to define an underdrain cross-section and wherein the permeable upper surface supports the media bed;
and
an upper shaped drain assembly including a plurality of elongated upper drain structures positioned above the shaped underdrain assembly, the upper drain structures having a permeable upper drain surface, an upper drain lower surface and an upper drain interior defining an upper drain cross-section, wherein the permeable upper drain surface comprises a slotted screen.

3 more elements

A method for promoting biological treatment in a biofilter, comprising:

positioning a shaped underdrain assembly in a floor of a biofilter tank, the floor defining one or more flow channels and wherein the shaped underdrain assembly includes a plurality of elongated underdrain structures, each elongated underdrain structure having a flume plate residing within the one or more flow channels, each elongated underdrain structure further including a permeable upper surface, a lower surface and an underdrain interior so as to define an underdrain cross-section, and wherein each lower surface is in fluid communication with at least one of the flow channels through the flume plate;
supporting a media bed on the permeable upper surface of each elongated underdrain structure;
positioning an upper shaped drain assembly in the biofilter tank, the upper shaped drain assembly located above the shaped underdrain assembly, the upper shaped drain assembly including a plurality of elongated upper drain structures, each elongated upper drain structure including an upper drain permeable surface, an upper drain lower surface and an upper drain interior defining an upper drain cross-section, wherein the upper drain permeable surface comprises a slotted screen;
and
directing a fluid flow through the permeable upper surface to promote biological interaction in the media bed.

2 more elements

Dependencies are inferred from the claim text.

Biofilter with shaped underdrain assembly

Life of this patent

Biofilter with shaped underdrain assembly

Life of this patent

Abstract

Claims22