The technology to produce low pressure air, an energy intensive ingredient in the wastewater process, has made significant steps forward in recent years. Unfortunately, the specifications for testing these new sophisticated air producers have not kept pace.
In August of 2007, the Michigan Department of Environmental Quality issued seasonal ammonia discharge limits for the Coldwater Wastewater Treatment Plant (WWTP), which included a daily maximum ammonia concentration of 2.0 mg/L between the months of May and November.
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.
Turning wastewater into drinking water. Fueling cars with tap water. Installing “waterless” toilets in airport restrooms. Each and every day, people around the globe are trying to transform the water industry in many ways. Here are five steps to help you revolutionize the water industry.
Los Alamos, NM, the former site of topsecret laboratories where government scientists developed the atomic bomb during World War II, is once again a town at the forefront of new technology.
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.
The Chicago area is served by a combined sewer network that carries both raw sewage and storm water.
Winslow Township — the largest town in Camden County, NJ — sought relief from its clog-prone, unreliable pumps.
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.