This is a two-step activated sludge system treating wastewater in Houston, Texas. The first step uses five circular tanks to treat the concentrated waste. The second step (shown in this video) has seven rectangular tanks to further reduce the concentration of the influent wastewater using bidirectional jet aerators.
More air is used for the front end of the aeration tank, where the concentration is high. The rear end of the aeration tank is for maintaining dissolved oxygen, as well as treating the remaining load.
This tank is one of five that treats petrochemical and refinery wastewater in Houston, Texas. It has four directional jet aerators that mix the liquid in a counterclockwise motion. The plant collects wastewater from approximately fifty industries surrounding the plant.
The plant was initially constructed to aerate the wastewater using air, but was later converted to use pure oxygen. The conversion was intended for expansion purposes, as well as to reduce the volatile emissions being released into the atmosphere. By adding pure oxygen, the plant is able to increase capacity by 200-300%.
Directional jet aerators during the installation process at a pulp mill in British Columbia, Canada. These aerators belong to an activated sludge system that uses in-ground tanks rather than building a concrete tank above ground.
This tank is currently being filled using both directional and bidirectional aerators. The video demonstrates that the jet nozzles are installed level for equal air distribution.
This tank is part of a plant located in Canada, and is designed for activated sludge at low temperatures. This type of design is typically used in tanks with liquid levels between 15 and 35 feet.
A basin for this pulp and paper plant in Alberta, Canada had four directional mix jet aerators and three bidirectional mix jet aerators installed. The aerators were supplied by four 200 HP and three 125 HP vertical pumps, as well as two 800 HP centrifugal air blowers.
This tank belongs to an activated sludge system in operation at a pulp mill in Canada. The tank is being mixed with one bidirectional jet aerator. The system is designed for cold climates.
This video shows the backflush in an activated sludge tank. The system is being flushed using the airlift principle, which involves reversing the flow from the digestor through the jet nozzles, and out at the top of the tank. A strainer can be used to collect these solids, if necessary.
We have an animation video of this process:https://youtu.be/z-wzZFixq4Q
This activated sludge plant uses a tank with a 105 foot diameter and 25 foot height. Intense mixing occurs within the tank, which can be mixed with or without aeration. Recirculation pumps provide the needed mixing energy for keeping the solids in suspension.
Several FRP (fiberglass reinforced plastic) jet aerators are thoroughly mixing and aerating the contents of this wastewater tank. The tank is part of a refinery located in Mexico.