Abstract: An apparatus and method for consumption of at least one compound from a fluid are disclosed. A method, comprising: providing processed algae for subsequent use in accelerated consumption of at least one compound from a fluid to be treated by exposing algae to a processing fluid depleted in the at least one compound to be consumed by the algae in a processing vessel; adding said processed algae to a contact receptacle containing said fluid to be treated to reduce a concentration of said at least one compound from said fluid to be treated; and recirculating at least a portion of said algae and said processing fluid from said contact receptacle to said processing vessel. This makes the processed algae better adapted to reduce the amount or concentration of the at least one compound within the fluid more quickly than is possible with unprocessed algae.