Simultaneous nitrification and denitrification (SNdN) is an attractive option for design engineers and scientists as it may offer significant advantages over the conventional processes with separate nitrification and denitrification reactors. For example, SNdN eliminates the need for a separate denitrification tank and mixed liquor recycle. It offers aeration energy savings and improved sludge settling. SNdN was not considered a reliable option for nitrogen removal, until very recently. A lack of practical experience had created such a negative perception. However, introduction of the award winning SymBio® technology in the USA in 1999 by Enviroquip a Division of Eimco Water Technologies has established the reliability of SNdN for biological nutrient removal (BNR).
Currently 50+ installations worldwide are benefiting from this concept. In the United States, SymBio® process has been selected for retrofitting of nitrifying plants to incorporate denitrification in municipal as well as industrial wastewater treatment plants. The design flow capacity of these plants range from 100,000 gpd to 40 MGD. It has also been selected as the basis of design for several new plants. Total installed capacity of plants using the SymBio SNdN technology in the United States is approximately 100 MGD.
Protected by U.S. Patents: 6,743,362; 6,712,970; 5,506,096; 5,557,415; 5,700,370; 5,906,746; and Patents Pending.
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