John L Novak

US Patent:

6685834, Feb 3, 2004

Filed:

Dec 20, 1999

Appl. No.:

09/467814

Inventors:

Sudhir N. Murthy - Reston VA
R. David Holbrook - Blacksburg VA
John T. Novak - Blacksburg VA
Sun-Nan Hong - Cary NC

Assignee:

Kruger, Inc. - Cary NC

International Classification:

C02F 300

US Classification:

210613, 210631, 210727

Abstract:

A Method of treating sludge prior to dewatering by mixing with the sludge a cationic metal in the form of an iron or aluminum slat along with a cationic polymer. The addition of the iron or aluminum salt substantially reduces the amount of polymer required for acceptable dewatering, thusly significantly reducing the cost of the dewatering process. The method is enhanced by subjecting the prior digested sludge to mesophilic aeration prior to the cationic metal salt and polymer being added.

US Patent:

7833415, Nov 16, 2010

Filed:

Oct 25, 2006

Appl. No.:

11/585842

Inventors:

Sudhir N. Murthy - Washington DC, US
John T. Novak - Blacksburg VA, US
Glen T. Daigger - Parker CO, US
Perry Schafer - Sacramento CA, US
Christopher Peot - Washington DC, US

Assignee:

D.C. Water & Sewer Authority - Washington DC

International Classification:

C02F 3/00

US Classification:

210605

Abstract:

An improved process for sludge treatment includes anaerobic digestion followed by post-mesophilic aerobic and/or anoxic digestion. The first anaerobic step may be performed under either mesophilic or thermophilic conditions. The subsequent aerobic/anoxic digestion may be performed using either simultaneous, sequential or pulsed aerobic and anoxic conditions. An apparatus for performing the improved sludge treatment may be one digester for performing the anaerobic followed by aerobic/anoxic digestion. Alternatively, the system for performing the improved sludge treatment techniques may be at least two digest reactors.

US Patent:

20070062882, Mar 22, 2007

Filed:

Sep 19, 2006

Appl. No.:

11/523980

Inventors:

Gregory Adams - Corona del Mar CA, US
Yen-Chih Chen - Lewisburg PA, US
Robert Forbes - Waxhaw NC, US
Matthew Higgins - Lewisburg PA, US
John Novak - Blacksburg VA, US
Jay Witherspoon - Seattle WA, US

International Classification:

C02F 11/12

US Classification:

210749000, 210916000

Abstract:

A method of reducing odors from dewatered biosolids cake includes adding an aluminum-containing compound to digested wastewater sludge prior to dewatering, thereby binding odor-causing proteins with the aluminum-containing compound.