D.c. Water & Sewer & Authority

Hampton Roads Sanitation District

Wett, Bernhard

Murthy, Sudhir N.

Christine deBarbadillo

Sudhir N Murthy

Bernhard Wett

Charles Bott

Haydee De Clippeleir

Maureen O'Shaughnessy

Stephanie Klaus

Michael Parsons

Charles B Bott

A methodology, system and apparatus are provided that include anoxic biofilms to perform partial denitrification and anammox (PdNA) reactions. The PdNA reactions can facilitate process intensification and carbon efficient biological nitrogen removal. The anoxic biofilms can be placed in a pre-anoxic zone or a downstream anoxic zone, where the biofilm and reactions are managed, including using storage compounds, to overcome mass transfer limitations in the biofilm. The methodology, system and apparatus can, when compared to state-of-the art technologies, improve the concentration gradient or reduce mass transfer limitations to facilitate PdNA reactions.

Method and apparatus for nutrient removal using anoxic biofilms

This disclosure relates to physical selection, deselection or outselection for smaller, less dense, sheared or compressed particles in sludge, wherein the first deselection step occurs at the reactor or at a clarification step, by separately deselecting for such particles and then a second deselection step occurs in an external selector. This double deselection promotes the more efficient removal of slow settling particles, while simultaneously allowing for maintenance of multiple solids residence times for fast and slow growing organisms. The deselection in a clarifier occurs typically at the periphery of the tank or at the surface of a blanket using a positive or negative pressure device. Structures such as slotted or perforated plates, pipes or manifolds can be used to assist in such deselection. Baffles can also be used for such deselection.

Method and apparatus for multi-deselection in wastewater treatment

Growing community of inventors

Washington, DC, United States of America

Christine deBarbadillo