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As part of an ongoing effort to improve efficiency and lifecycle costs across all of its projects, a Municipal Utilities Board in Albertville, Ala., set out to upgrade solids handling at the WWTP and pursue Class A biosolids certification, a U.S. Environmental Protection Agency (EPA) designation for dewatered and heated sludge that contains low levels of pathogens.
Desalination Serves Coastal Argentine City
When a series of water crises in 2014 disrupted conventional utility services in the coastal Argentine city of Caleta Olivia, the city needed a way to ensure an uninterrupted water supply.
Tornado Aerators At Chicago O’Hare Wastewater Treatment Reservoir
The Chicago area is served by a combined sewer network that carries both raw sewage and storm water.
Sulzer Pumps Reduce Downtime At Water Utility
Winslow Township — the largest town in Camden County, NJ — sought relief from its clog-prone, unreliable pumps.
Fresh Water Aeration Solutions For Lakes, Rivers, And Reservoirs
Aeration and mixing transform anoxic conditions in fresh water bodies. Adding oxygen to lakes, rivers and ponds decreases algae, eliminates anaerobic odors, and provides ice control in cold climates.
Activating The Sludge In Small Municipal Facultative Waste Lagoon Systems
Wastewater treatment lagoons were originally facultative in design — shallow, single and multi-cell lagoon systems that counted on wind, sunlight, anaerobic bacteria, and time for the digestion of the organic components of the wastewater.
Bioloop Retrofit Reduces Energy Consumption By 43 Percent
When a broken shaft caused a malfunction in one of the brush aerators at the village of Liberty, NY, WWTP, the village worked with its engineers to develop a plan for repair and upgrade.
When the Jacksonville, Florida Naval Air Station needed to increase oxygen in their aeration basins, they turned to RWL Water. Five submersible HURRICANE aerators provide bottom-up mixing, drawing surface air and dispersing it in a 360-degree pattern near the basin floor. Long bubble hang time results in excellent oxygen transfer, and ensures excellent BOD and ammonia removal, treating flows up to 3 MGD.
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A common first step in the secondary treatment process is to send wastewater to an aeration tank. In an aeration tank, bacterium is used to effectively break down pollutants into less harmful components. Wastewater aeration provides the appropriate oxygen level so that aerobic bacteria can thrive in degrading pollutants such as iron and manganese as part of the wastewater treatment process. Aeration can also be used to destroy anaerobic bacteria that perish in the presence of oxygen. Aerobes that can break down pollutants 10-100 times faster than anaerobes are used most frequently.
Aeration is also used to improve waste lagoons and other waterways such as lakes and reservoirs where oxygen deficiency contributes to taste, odor and pollutant problems. Equipment used for wastewater aeration includes low cascades, jet fountains, spray nozzles, blowers, submerged perforated pipe and porous plates or tubes. Whether the water is thrown into the air via a fountain or diffused by air bubbles being blown or drawn into the wastewater in an aeration tank, aeration works by increasing the area of contact between the oxygen in the air and water.
The most common wastewater aeration process in use today is the air diffusion process, where air is introduced from blowers through diffusion tubes suspended in a spiral flow tank, or in some cases, through diffuser plates in the bottom of the aeration tanks.