David A Slack

US Patent:

7141164, Nov 28, 2006

Filed:

Apr 5, 2004

Appl. No.:

10/818157

Inventors:

David C. Slack - Tampa FL, US
Navin Kadakia - Bridgeville PA, US

Assignee:

Severn Trent Water Purification, Inc. - Colmar PA

International Classification:

B01D 24/38
B01D 24/46

US Classification:

210232, 210293

Abstract:

An underdrain block for a filter system comprises a housing that has of a top wall, a bottom wall, a first end wall, a second end wall, a first side wall, and a second side wall. The end walls and the side walls connect the top wall to the bottom wall. The bottom wall forms two lateral rows of support legs configured to straddle infrastructure of the filter system. One or more snap-locking mechanisms are located on the side walls so that adjacent underdrain blocks are interconnected by the locking mechanisms when snapped in place. In one embodiment, the first side wall comprises one or more tongue lugs and the second side wall comprises one or more groove lugs, each groove lug defines a groove for mating with the tongue lug so that adjacent housings are interconnected by the tongue-in-groove locking mechanisms when the tongue lugs are snapped into the grooves.

US Patent:

7997041, Aug 16, 2011

Filed:

Feb 15, 2006

Appl. No.:

12/279364

Inventors:

David C. Slack - Tampa FL, US
Navin Kadakia - Bridgeville PA, US
Joseph M. Bonazza - Tarentum PA, US

Assignee:

Seven Trent Water Purification, Inc. - Colmar PA

International Classification:

E04C 3/00
E04C 2/04
E04B 2/00
B01D 24/00
B01D 24/12

US Classification:

525891, 52578, 525901, 525902, 525911, 525921, 525881, 52604, 210289, 210293

Abstract:

A system and method for forming a filter media support system with dual locking mechanisms. The support system comprises two or more interlocking rows of support blocks. One or more slides and one or more guides protrude from the side walls of the blocks. Each guide is conformed to receive one slide from a neighboring block, forming a first locking joint. The side walls also comprise one or more posts and one or more sockets. Each post is conformed to fit within one socket of a neighboring block, forming a second locking joint. In one embodiment, the method for assembling the support system comprises aligning a slide of a first support block with a guide of a second support block. The slide of the first support block is vertically moved into the guide of the second support block. Force is applied so that the posts snap-lock into the sockets.

US Patent:

8069630, Dec 6, 2011

Filed:

Mar 27, 2007

Appl. No.:

11/728868

Inventors:

David C. Slack - Tampa FL, US
Navin Kadakia - Bridgeville PA, US

Assignee:

Severn Trent Water Purification, Inc. - Colmar PA

International Classification:

E04C 3/00
E04C 2/04
E04B 2/00
B01D 24/00
B01D 24/12

US Classification:

525891, 52578, 525901, 525902, 525911, 525921, 525881, 52604, 210289, 210293

Abstract:

A system and method for forming a filter media support system with multiple locking mechanisms. The support system comprises two or more interlocking rows of support blocks. One or more slides and one or more guides protrude from the side walls of the blocks. Each guide is conformed to receive one slide from a neighboring block, forming a first locking joint. The side walls also comprise one or more nubs and one or more recesses. Each nub is conformed to fit within one recess of a neighboring block, forming a second locking joint. In one embodiment, the method for assembling the support system comprises aligning a slide of a first support block with a guide of a second support block. The slide of the first support block is vertically moved into the guide of the second support block. Force is applied so that the nubs are flexed within the recesses.

US Patent:

54964725, Mar 5, 1996

Filed:

Dec 20, 1993

Appl. No.:

8/170531

Inventors:

David C. Slack - Tampa FL
Gregory A. Ellard - Tampa FL

Assignee:

Tetra Technologies, Inc. - The Woodlands TX

International Classification:

C02F 300

US Classification:

210605

Abstract:

This invention relates to a method and apparatus of denitrification. The apparatus includes a weir block, a denitrification vessel having a wall surface, and filter media having microorganisms on their surfaces. The weir block may have a convex outer surface which is tangentially adjacent to and preferably contiguous with the upper end of the wall, whose lower end is in contact with the water in the denitrification vessel. The method may include passing the wastewater over the convex surface of the weir block, passing the water over the second surface of the substantially vertical wall and into the denitrification vessel while preferably maintaining substantially laminar flow and limiting the dissolved oxygen in the denitrification vessel, preferably to below about 5 mg/L and more preferably to below about 4 mg/L.