NOVELTY - A fermenter comprising a fermentation tank (12) with an aeration system, heating and mixing units, is new.    USE - For use in biological processing of waste water or bioaugmentation.    ADVANTAGE - The fermenter provided with improved bioaugmentation effectively increases the efficiency of waste water treatment (WWT). The on-site, automated and continuous fermenter effectively reduces shipping cost of transporting inoculam to waste water treatment plant (WWTP). The fermenter is economical, and effectively provides increased concentration of desired or target microbe in inoculum and decreases propagation of non-target and non-functional microbes during WWT. The automated fermenter can be controlled from remote location and can effectively monitor and control pH, temperature, nutrients, carbon sources, aeration, and mixing during WWT. The fermenter is provided with a multi-stage fermented vessel capable of providing effective concentration of desired microbes for WWT, which can effectively be reinoculated from batch to batch and is also used in quality assurance and quality control purposes. The fermentation tank in the fermenter can be easily washed, cleaned and sterilized, and is capable of growing single or multiple-strain in single or multiple-batches, in single day.    DETAILED DESCRIPTION - A fermenter comprising a fermentation tank (12) with an aeration system, heating and mixing units, is new. The skid mounted and movable fermentation tank comprises a spray bar for introducing liquids, at least one air vent, blower and a fine bubble diffuser capable of supplying oxygen at a rate greater than 30 mg/l/r and mixing the microbial suspension. The tank is controlled remotely and is supplied with preheated water, the contents of the tank are heated to 30-37degreesC, preferably 40-80degreesC during fermentation. The tank is further attached to prefermentation tank (16) and storage tank (14).    INDEPENDENT CLAIMS are also included for the following:    (a) a method for growing microbes used for treating waste water;    (b) a method for reducing time and cost required for retaining compliance with environmental discharge regulation; and    (c) a method for reducing the amount of settling aid required by waste water treatment system.    DESCRIPTION OF DRAWING(S) - The figure shows the conceptional diagram of a fermentation process.