Recirculation

Traditional recirculation systems have used rapidly utilized electron donors such as molasses or sodium lactate to treat large volumes of water.  The rate of injection can limit the effective treatment zone and multiple injections or continuous injections of electron donor can severely foul injection wells and result in high maintenance costs.  These problems can be minimized by using emulsified vegetable oils (EVO) .  There is commonly a lag between injection and bacterial growth.  The slow release nature of EVO allows for weeks or months of injection with minimal biofouling.  The recirculation system can be turned off for months or years once EVO has been distributed throughout the treatment zone and EVO breakthrough to the extraction wells has been observed.  This can result in substantial savings in operations and maintenance costs.