Submerged clarifier launder

US9919244B2 · kind B2 · utility

Assignee

• Ovivo Inc. · CA

Inventors

• Tor Heimdal · Salt Lake City, US
• John Vorwaller · Salt Lake City, US
• Hugh Ryan Clark · Lehi, US
• Todd Kline · Salt Lake City, US
• Ralph Petrone · South Jordan, US
• Bruce A. Hugo · Sandy, US
• Roger Peters · Hayward, US
• Tyson Beaman · Murray, US

Key dates

• Filing date: Mar 7, 2016
• Grant date: Mar 20, 2018
• Expiry date: Mar 7, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W10/37
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A clarifier in a wastewater treatment plant is provided with a submerged launder for effluent, the launder preferably having an integral density current baffle and scum baffle. In one embodiment an existing launder is modified, with its vertical leg replaced with a sloped plate defining launder conduit triangular in cross section, and with a sloping portion of the plate forming a density current baffle. Openings in the sloped plate permit entry of effluent liquid, and the liquid level in a clarifier is controlled without an overflow weir plate. In another form submerged pipe with entry holes serves as the launder, with support brackets integral with a density current baffle. A third form of the launder is a box formed beneath the shelf of an existing internal launder in the clarifier, again with a density current baffle extending down from the box. In another version an existing launder is covered and sealed, and holes are drilled through the launder wall to admit effluent. A submerged launder avoids problems of algae buildup and the need for algae sweeps or frequent cleaning of the launder.