NOVELTY - The method comprises treating a portion of waste environment to inactivate or diminish native microorganisms, adding augmenting microorganisms to the treated waste environment, simultaneously growing and acclimating a microbiological culture, and discharging the microbiological culture to the waste environment. The portion of the waste environment is treated by heating, pasteurizing, sterilizing or treating the waste environment at 50 degrees C for a period of time of 10 minutes to 1 hour. The wastewater is treated by filtering the wastewater through a micro-filtration or ultra-filtration membrane.    USE - The method is useful for purifying a waste environment e.g. wastewater or landfill (claimed).    ADVANTAGE - The method enables simultaneous acclimation and growth of the microorganisms with the in-situ bio-augmentation bioreactor thus reducing the time for preparing the microbiological culture and effectively, rapidly and economically purifying the wastewater.    DETAILED DESCRIPTION - The method comprises treating a portion of waste environment to inactivate or diminish native microorganisms, adding augmenting microorganisms to the treated waste environment, simultaneously growing and acclimating a microbiological culture, and discharging the microbiological culture to the waste environment. The portion of the waste environment is treated by heating, pasteurizing, sterilizing or treating the waste environment at 50 degrees C for a period of time of 10 minutes to 1 hour. The wastewater is treated by filtering the wastewater through a micro-filtration or ultra-filtration membrane. The augmenting microorganisms are added in a concentration of cells of 1x 104 cfu per milliliter of fluid, and grown in an in-situ bio-augmentation bioreactor (20) that is located at the site of the waste environment.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a method for purifying wastewater.    In-situ bio-augmentation bioreactor (20)    Portion of the wastewater (30)    Pre-treatment of the waster water (40)    Anaerobic tank (50)    Aeration tank. (60)