Birmingham Water Works Board (BWWB) of Birmingham, Ala., has consistently achieved the rating of the number-five water system in the United States...
AnoxKaldnes, Inc., manufacturer of patented LagoonGuard, MBBR and BiofilmChip, is marketing its proven system, the HYBAS treatment process. The HYBAS is a type of Integrated Fixed-Film Activated Sludge IFAS treatment process. This system is especially suitable for nitrogen removal in existing activated sludge systems. HYBAS has the ability to upgrade existing treatment systems using the existing tanks on-site to meet new effluent ammonia or even total nitrogen limits.
The HYBAS increases aerobic sludge age of the aerobic basins without increasing the solids loading rate to the secondary clarifiers because it allows the nitrifiers to grow on the biofilm carrier elements, which are retained within the aerobic zones of the system. The design of HYBAS is extremely flexible, compact and non-clogging for proven performance for many years to come. It is also designed to minimize any maintenance costs and provide for low overall lifecycle costs. It is a cost-effective way to upgrade a wastewater treatment system.
The basis of the HYBAS process is the thousands of polyethylene carrier elements that provide a home for a vast, highly active bacteria culture. These elements are kept in constant motion throughout the entire volume of the wastewater by our specially designed aeration system and sieves, resulting in uniform, highly effective treatment.
Most recently AnoxKaldnes installed HYBAS into a city with an activated sludge system for BOD removal only. Due to the increase in projected flows and the implementation of new effluent requirements, expansion of the plant was required. The HYBAS process made it possible to convert the existing conventional activated sludge plant to increase its treatment capacity from 5.4 to 8 mgd and nitrogen removal to less than 10 mg/L. The results of the upgrade showed consistent effluent ammonia concentrations to less than 0.5 mg/L using the HYBAS process in only 4.5 hours of retention time at 55°F. Adding more media can expand the process further.