John W Schrader

US Patent:

7828976, Nov 9, 2010

Filed:

Jun 22, 2007

Appl. No.:

11/767010

Inventors:

Kashi Banerjee - Moon Township PA, US
Charles D. Blumenschein - Pittsburgh PA, US
John Charles Schrader - Pittsburgh PA, US

Assignee:

I. Kruger, Inc. - Cary NC

International Classification:

C02F 1/52
C02F 1/58

US Classification:

210631, 210711, 210713, 210714, 210725, 210727, 210906

Abstract:

A process for removing phosphorus from wastewater wherein an iron or aluminum salt is added to the wastewater. The iron or aluminum salt results in the precipitation of certain iron or aluminum species that include phosphorus adsorption sites. These iron or phosphorus species are settled and become a part of sludge produced in the course of the wastewater treatment process. By recycling substantial portions of the sludge, the concentration of these iron or aluminum species in the wastewater is increased. This increased concentration results in the presence of large quantities of unused phosphorus adsorption sites that attract and adsorb phosphorus, resulting in phosphorus being removed from the wastewater.

US Patent:

8147695, Apr 3, 2012

Filed:

Oct 26, 2010

Appl. No.:

12/911914

Inventors:

Kashi Banerjee - Moon Township PA, US
Charles D. Blumenschein - Pittsburgh PA, US
John Charles Schrader - Pittsburgh PA, US

Assignee:

I. Kruger Inc. - Glen Ellyn IL

International Classification:

C02F 3/00
C02F 1/52
C02F 1/58

US Classification:

210614, 210631, 210709, 210711, 210713, 210714, 210727, 210906

Abstract:

A process for removing phosphorus from wastewater wherein an iron or aluminum salt is added to the wastewater. The iron or aluminum salt results in the precipitation of certain iron or aluminum species that include phosphorus adsorption sites. These iron or phosphorus species are settled and become a part of sludge produced in the course of the wastewater treatment process. By recycling substantial portions of the sludge, the concentration of these iron or aluminum species in the wastewater is increased. This increased concentration results in the presence of large quantities of unused phosphorus adsorption sites that attract and adsorb phosphorus, resulting in phosphorus being removed from the wastewater.

US Patent:

20120160770, Jun 28, 2012

Filed:

Jun 23, 2011

Appl. No.:

13/166928

Inventors:

Kashi Banerjee - Moon Township PA, US
Charles D. Blumenschein - Pittsburgh PA, US
Robert G. Cook - Montgomery TX, US
John C. Schrader - Pittsburgh PA, US

Assignee:

VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT - Saint-Maurice

International Classification:

C02F 1/58
C02F 1/28
C02F 1/52
C02F 1/44

US Classification:

210638, 210667

Abstract:

A method of reducing a sulfate concentration in wastewater comprises directing the wastewater stream to a precipitation reactor and mixing the wastewater stream with a calcium source and a calcium salt seed material to precipitate calcium sulfate. The precipitated calcium sulfate is then separated from a treated effluent and directed to a settling tank where the precipitated calcium sulfate is separated into heavier calcium sulfate precipitants and lighter calcium sulfate precipitants. The heavier calcium sulfate precipitants and the lighter calcium sulfate precipitants are separately recirculated to the precipitation reactor. A predetermined mass ratio of solids is maintained in the precipitation reactor.

US Patent:

20160167987, Jun 16, 2016

Filed:

Feb 19, 2016

Appl. No.:

15/048342

Inventors:

- Saint-Maurice, FR
Charles D. Blumenschein - Pittsburgh PA, US
John Charles Schrader - Pittsburgh PA, US
Robert G. Cook - Montgomery TX, US

Assignee:

Veolia Water Solutions & Technologies Support - Saint-Maurice

International Classification:

C02F 1/52
C02F 1/44

Abstract:

A method for removing sulfate from a wastewater stream includes mixing gibbsite and a calcium source to precipitate Ettringite from the wastewater stream and produce an effluent with a reduced sulfate concentration. The gibbsite in the precipitated Ettringite is regenerated by mixing an acid with the Ettringite and precipitating gibbsite particles, after which the gibbsite particles are subjected to a crystallization process to increase the size of the gibbsite particles which are recycled back to the main stream.

US Patent:

20140144843, May 29, 2014

Filed:

Nov 22, 2013

Appl. No.:

14/087629

Inventors:

- Saint-Maurice, FR
Charles D. Blumenschein - Pittsburgh PA, US
John Charles Schrader - Pittsburgh PA, US
Robert G. Cook - Montgomery TX, US

Assignee:

Veolia Water Solutions & Technologies Support - Saint-Maurice

International Classification:

C02F 1/52

US Classification:

210713

Abstract:

A method for removing sulfate from a wastewater stream includes mixing gibbsite and a calcium source to precipitate Ettringite from the wastewater stream and produce an effluent with a reduced sulfate concentration. The gibbsite in the precipitated Ettringite is regenerated by mixing an acid with the Ettringite and precipitating gibbsite particles, after which the gibbsite particles are subjected to a crystallization process to increase the size of the gibbsite particles which are recycled back to the main stream.