Ammonia stripper
An ammonia stripper has an aerator and heat exchanger tubing in a tank. The aerator and coil are preferably attached to a frame to form a removable cassette. The cassette may also include a lid for the tank. The tank is preferably rectangular and optionally can be made with the dimensions of a standard shipping container. In a process, water flows through the tank while air bubbles are produced through the aerator. A heating medium such as water flows through the heat exchanger tubing. A gas containing ammonia is withdrawn from a headspace of the tank.
1. An ammonia stripper comprising,
a) a tank having internal dividers that create a plurality of cells within the tank;
wherein within each of the plurality of cells is located:
b) an aerator; and,
c) heat exchanger tubing;
wherein the aerator and heat exchanger tubing of each cell are attached to a frame inside the cell wherein the aerator, heat exchanger tubing and frame are parts of a cassette that is removable from the tank.
2. The ammonia stripper of claim 1 wherein the tank defines a headspace and further comprising an outlet in communication with the headspace.
3. The ammonia stripper of claim 2 wherein the tank is rectangular.
4. The ammonia stripper of claim 1 wherein the tank that is rectangular and has the dimensions of an ISO shipping container.
5. A process for stripping ammonia from water comprising steps of,
a) providing an ammonia stripper according to claim 1 ;
b) adding water produced from dewatering sludge to the tank such that the heat exchanger tubing is immersed;
c) producing air bubbles in the water from the aerator;
d) flowing a heating medium through the heat exchanger tube;
e) withdrawing a gas containing ammonia from the headspace of the tank.
6. The ammonia stripper of claim 1 wherein the cassette includes a lid covering at least part of a cell in which the cassette is located, the lid attached to the frame such that the frame is suspended from the lid.
7. The ammonia stripper of claim 6 , wherein the cassette includes a set of latches that secure the lid to at least one of a wall of the tank and an internal divider.
8. The ammonia stripper of claim 1 having a length of heat exchanger tubing that is greater than the perimeter of the tank.
9. The ammonia stripper of claim 1 having a plurality of aerators dispersed across the bottom of the tank.
10. The ammonia stripper of claim 1 having, in each of the plurality of cells, a plurality of aerators extending from a manifold attached to the frame.