AQUA DESIGNER is a software tool for the design of the several processes of a wastewater treatment plant, from mechanical treatment via biology up to sludge treatment. Regarding the basis of calculation, the process and the construction all common process variations are to choice. Planning is supported by many auxiliary functions. As result AQUA DESIGNER supplies extensive documents ready to be printed for official documents, including buildings, machines, operating costs and true scaled drawings. AQUA DESIGNER is used world-wide for the planning of treatment plants. The application is available in eleven different languages. Simple Handling AQUA DESIGNER: Simple Handling One of the special characteristics of AQUA DESIGNER is the consistently guidance of the user by a flow diagram. From the first sight you can see the current processing status, the selected way of design or process and the possible alternatives. Basis of Calculation, Variations of Process and Construction Mechanical Treatment With AQUA DESIGNER you could select the following components: aerated grit and grease chamber circular grit chamber primary settling tank Biology Basis for dimensioning of the biological stage are different ATV-guidelines (A 126, A 131, M 210 etc.) and work reports, the university algorythm and extensive technical literature. With AQUA DESIGNER you could dimension the following plants: secondary sedimentation as an inner sedimentation tank, compact-, round-, rectangular tank activated chamber as as ring-, round-, rectangular-, oxidation ditch or cascaded chambers vertical axis, horicontal axis or membranes as disc or tubular aerators dentrifugal or screw pumps as well as air lift pumps scraper or suction remover Mechanical equipment like pumps, blowers, mixers are available in data bases. The power input of the machines selected here are automatically considered in the operation costs. True scaled drawings of the buildings and aeration equipment support you while working out or evaluating the design. Cleaning processes available: carbon degradation nitrification denitrification: separate stage, intermittend, simultaneous, cascaded denitrification phosphorus removal external carbon dosage