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Heavy metals are metallic elements with high molecular weight and these substituents are toxic to living things even at low levels. Heavy metal pollution is very harmful to environment, especially for water-rich areas. These heavy metal pollutions originate from the industrial wastes that are dumped into the river. In this study, the concentration of heavy metals is decreased by using ozonation which uses the addition of hydrogen peroxide (H 2 O 2 ) to produce hydroxyl radicals (OH ● ) as a strong oxidizing agent. This method is known as Advanced Oxidation Process (AOP). The purpose of this research is to study the effects of the types of heavy metals and the process variables that are used such as the addition of H 2 O 2 temperature operation and pH condition. The study, show that iron, copper and manganese can be removed with AOP technology, the addition of H 2 O 2 , operating temperature and pH condition is able to accelerate the metals reduction. Background: Heavy metal pollutions are very dangerous to the environment especially on water body area. The heavy metal pollutants may harm either to human or to the ecosystem of the water itself (Supriharyono, 2000; Soemirat, 2005). Sastrawijaya, 2000 wrote that environment pollutions occur due to the addition of either living things, substances, energy or any other components to the environment which change the environment balance and decrease the quality of the environmental function. Many methods have been introduced to minimize the heavy metal pollutions such as sedimentation, filtration, adsorption and elimination using microbiology. Another promising technology in reducing heavy metal pollutions is using oxidation to get precipitated heavy metal then combined with filtration. Chlorine commonly used as the oxidation agent, however the present of other chlorination products in the water have also become another concern for human health. Nowadays, ozone has become a popular oxidation agent for removal impurities in water since ozone has strong oxidation ability either to organic or inorganic compounds. Ozone reactions are selective thus elimination of impurities may take longer times. The presence of ozone in water can produce stronger oxidant than ozone itself which is called as hydroxyl radical (OH • ). The reactions of hydroxyl radical or often called as Advanced Oxidation Process (AOP) are unselective and will provide faster reaction for heavy metal eliminations. Aims: In this research, the effect of hydrogen peroxide addition, pH and temperature operation of AOP were studied to obtain optimum operation condition for ferrous (Fe), cuprous (Cu) and manganese (Mn) heavy metal elimination. Materials and Methods: The standard ferrous, cuprous and manganese were purchased from Merck, Indonesia whilst hydrogen peroxide, sodium hydroxide, and nitric acid were purchased from Sakura Chemical, Indonesia. The ozone was generated from ozone generator (Ozontech, South Korea) whilst the