公开(公告)号：US10150687B2

公开(公告)日：2018-12-11

申请号：US15448088

申请日：2017-03-02

Applicant: Ovivo Inc.

Inventor： Tor Heimdal ,  Ryan Clark ,  Scott Hawkins ,  John Vorwaller

IPC: B01F5/10 ,  C02F11/12 ,  B01F7/22

Abstract: In a sludge thickener water/wastewater treatment system, sludge solids are recirculated with a mixer positioned in the influent column or offset from the center column and within the stilling well, in order to produce essentially constant sludge solids concentration in the sludge withdrawn from the thickener. This solves the problem of thickeners producing inconsistent underflow solids concentration and often exhibiting problems with binding of rake arms due to sometimes very high sludge concentrations. Also, dewatering steps that follow thickening typically require a relatively constant solids concentration for efficient operation.

公开(公告)号：US09919244B2

公开(公告)日：2018-03-20

申请号：US15063397

申请日：2016-03-07

Applicant: Ovivo Inc.

Inventor： Tor Heimdal ,  John Vorwaller ,  Hugh Ryan Clark ,  Todd Kline ,  Ralph Petrone ,  Bruce A. Hugo ,  Roger Peters ,  Tyson Beaman

IPC: B01D21/24 ,  B01D21/00

CPC classification number: B01D21/0006 ,  B01D21/0003 ,  B01D21/0042 ,  B01D21/2444 ,  Y02W10/37

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.

公开(公告)号：US20170319989A1

公开(公告)日：2017-11-09

申请号：US15146770

申请日：2016-05-04

Applicant: Ovivo Inc.

Inventor： Gary D. Haggard, SR. ,  Brendan Kelly

IPC: B01D24/46 ,  B01D24/22

CPC classification number: B01D24/4631 ,  B01D24/22 ,  B01D24/24

Abstract: Underdrain units in a sand medium or dual medium filtration system include efficient air, water and combined air/water cleaning. Air, water or both are delivered in backflow direction from a very low position on the underdrain unit, as well as water from a higher position, so as to effectively remove blocking contaminants on the outside the underdrain unit and in the surrounding filter media.

公开(公告)号：US20170252673A1

公开(公告)日：2017-09-07

申请号：US15063397

申请日：2016-03-07

Applicant: Ovivo Inc.

Inventor： Tor Heimdal ,  John Vorwaller ,  Hugh Ryan Clark ,  Todd Kline ,  Ralph Petrone ,  Bruce A. Hugo ,  Roger Peters ,  Tyson Beaman

IPC: B01D21/00 ,  B01D21/24

CPC classification number: B01D21/0006 ,  B01D21/0003 ,  B01D21/0042 ,  B01D21/2444 ,  Y02W10/37

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.