International Journal of Engineering Studies. ISSN 0975-6469 Volume 8, Number 2 (2016), pp. 259-275 © Research India Publications http://www.ripublication.com Reducing of a Scalling in a Cooling Tower by Areation Process K. Naveena Latha Assoc.professor, Department of Mechanical Engineering, TKR College of Engineering & Technology, Hyderabad, India. E-mail: naveenalatha.k@gmail.com Dr. P. Ram Reddy Professor, Department of Mechanical Engineering, Former Registrar, JNTUH, Hyderabad, India. E-mail: ramreddy1944@gmail.com Dr. D.V. Ravi Shankar Professor, Department of Mechanical Engineering, TKR College of Engineering & Technology, Hyderabad, India. E-mail: shankardasari@rediffmail.com P. Venkateshwar Reddy Asst.Professor, Department of Mechanical Engineering, TKR College of Engineering & Technology, Hyderabad, India. E-mail: mr.pvreddy@gmail.com Abstract Industrial waste water treatment is the process of removing pollutants from water using a combination of chemical, biological and physical methods. This paper describes an alternative method for controlling the total dissolved solids, Hardness, scaling and bacteria growth in a cooling tower by “aeration method” Many water treatment technologies have been in use since long. Out of these a new technology cavitation has proved to be useful on large scale operations in industry. Cavitation is a physical phenomenon associated with three aspects: formation, growth and collapse of vapor or gas-vapor bubbles within the body of a liquid due to variations of local static pressure. Decreasing the pressure over a liquid and bringing it to its vapor pressure at the operating temperature generates vapor bubbles in the liquid. When the pressure is brought back to normal pressure, these vaporous bubbles collapse with a bang to generate intense pressure and temperature at the point of collapse. Such intense