Ammonia removal
First Claim
1. A method for removing ammonia from liquid sludge containing ammonia and suspended solids, the method comprisingflowing the liquid sludge to an interior wall of an interior of a hollow stripping tower forming a flowing film of sludge on the interior wall, with the tower being at a positive pressure and with liquid sludge being supplied to the tower such that a wash rate is maintained in the tower of at least 5000 pounds per hour per foot of stripping tower periphery,flowing stripping gas past the film, stripping ammonia from the liquid sludge into the stripping gas, anddisengaging liquid sludge from the stripping gas in a disengaging zone in the stripping tower, producing disengaged liquid sludge,flowing the stripping gas upwardly in the stripping tower, andflowing the liquid sludge downwardly in the stripping tower.
2 Assignments
0 Petitions
Accused Products
Abstract
A method for stripping ammonia from a film of digested sludge including flowing alkaline liquid sludge as a film on a tower'"'"'s interior wall and flowing an ammonia stripping gas past the film creating a vapor containing ammonia and stripping gas; then disengaging the liquid sludge from the vapor in a tower disengaging zone.
-
Citations
18 Claims
-
1. A method for removing ammonia from liquid sludge containing ammonia and suspended solids, the method comprising
flowing the liquid sludge to an interior wall of an interior of a hollow stripping tower forming a flowing film of sludge on the interior wall, with the tower being at a positive pressure and with liquid sludge being supplied to the tower such that a wash rate is maintained in the tower of at least 5000 pounds per hour per foot of stripping tower periphery, flowing stripping gas past the film, stripping ammonia from the liquid sludge into the stripping gas, and disengaging liquid sludge from the stripping gas in a disengaging zone in the stripping tower, producing disengaged liquid sludge, flowing the stripping gas upwardly in the stripping tower, and flowing the liquid sludge downwardly in the stripping tower.
-
16. A method for removing ammonia from liquid sludge containing ammonia and suspended solids, the method comprising
flowing the liquid sludge to an interior wall of an interior of a stripping tower forming a flowing film of sludge on the interior wall, with the tower being at a positive pressure and with liquid sludge being supplied to the tower such that a wash rate is maintained in the tower of at least 5000 pounds per hour per foot of stripping tower periphery, flowing stripping gas past the film, stripping ammonia from the liquid sludge into the stripping gas, and disengaging liquid sludge from the stripping gas in a disengaging zone in the stripping tower, producing disengaged liquid sludge, flowing the stripping gas upwardly in the stripping tower, flowing the liquid sludge downwardly in the stripping tower, flowing the liquid sludge to the interior wall of the stripping tower with a sludge distributor, and inhibiting foaming and sticking in the stripper tower by having no internal devices in the stripping tower below the sludge distributor.
-
18. A method for removing ammonia from digested denatured liquid sludge containing ammonia and suspended solids, the method comprising
feeding the liquid sludge to a tank which is in fluid communication with an interior of a hollow stripping tower; -
flashing the liquid sludge into the tank producing stripping gas which flows to the stripping tower'"'"'s interior, with the tower being at a positive pressure, adjusting the pH of the liquid sludge in the tank to at least 9, agitating the liquid sludge in the tank, and then feeding the liquid sludge from the tank to the stripping tower, flowing the liquid sludge to an interior wall of the stripping tower forming a downward flowing film of sludge on the wall interior, flowing stripping gas upwardly past the film, stripping ammonia from the liquid sludge and forming a vapor containing ammonia and stripping gas, disengaging liquid sludge from the vapor in a disengaging zone in the stripping tower, producing disengaged liquid sludge, and sensing ammonia concentration level of the disengaged liquid sludge through the stripping tower to remove at least 99% by weight of the ammonia.
-
Specification