Beverage production leads to wastewaters with high quality (250025000mgCOD/L) and quantity (521m/d) variations. In a case study the pre-treatment of such wastewaters in a single stage activated sludge tank was to be investigated with the goal to optimise the biological pretreatment before discharge to the public municipal sewer system to reduce wastewater discharge fees. Therefore, a SBR-reactor was applied in which the original high COD concentrations should be reduced to about 1000mg/L. The wastewater stream was solely loaded with organics, the pH ranged from 3-6 and the averaged proportion of C:N:P was 100:0,0:0,4. Conditioning was required. The averaged COD/BOD5 ratio of the influent was 2. A pilot sequencing batch reactor was operated over a period of about seven months to obtain the necessary information for the SBR full scale design and operation. The operation of the pilot plant was continuously monitored by analysing samples of the raw wastewater, the plant influent as well as the pretreated effluent. After start up by inoculation with sludge from the public WWTP, the pilot plant was operated under steadily increasing sludge loadings from 0,004 to 0,9kgCOD/(kgDM*d). A maximum COD-elimination rate of 99% was achieved at a sludge loading rate of 0,1kgCOD/(kgCOD*d), the mean elimination rate was 71%. To safely achieve the discharge limit of 1000mgCOD/L a mean sludge loading rate of 0,2kgCOD/(kgDM*d), temporarily 0,4kgCOD/(kgCSB*d), was feasible.To prevent the exceedance of the discharge limit under higher loading rates due to peak concentrations and to optimise the metering of nutrients, the application of adapted control using UV-VIS and DO probes was tested. An oxygen based control was evaluated using a COD mass balance. UV-VIS is a promising online technology indicating COD load but the calibration of the system for wastewaters from different beverages turned out to be difficult and should be subject of further investigation.