Until 2012, the Kaufman, TX, Wastewater Treatment Plant (WWTP) operated two separate aeration basins with mechanical surface aerators. As the plant’s equipment aged and required more frequent and expensive repairs and maintenance, the City of Kaufman followed its engineering firm’s recommendation to install a new, more efficient, fine bubble-diffused air system rather than simply replacing its old mixers with in-kind equipment.
Lee Wastewater Treatment Facility (WWTF), located in Massachusetts, received an award for its excellent treatment performance in 2012 from the Environmental Protection Agency (EPA), 4 years after start-up.
This paper presents two types of DAF applications together with biosorption (the “Captivator system”) as primary treatments. In one case, the Captivator system is the sole primary treatment for a new plant installation and helps to gain 65 percent more biogas while requiring only 44 percent of aeration for COD oxidation, compared to a conventional process.
Pronal, a recycled paper plant, produces craft paper. The plant produces an average flow of 14,000 m3/day (3.7 MGD) of wastewater with high contents of Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Total Suspended Solids (TSS).
Sims Bayou begins near Missouri City, TX, and meanders northeast until it reaches Buffalo Bayou.
The Old Orchard Beach Wastewater Treatment Plant (WWTP) serves the town of Old Orchard Beach, Maine, a coastal resort community where the population swells from 9,000 year-round residents to 75,000 in late June through early August, when seasonal residents and day trippers descend for the peak summer months.
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.
The US Army Corps of Engineers chose RWL Water when they needed expert technology to treat wastewater at the largest Afghan National Army military post in the Nangahar Province of Afghanistan.
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.