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Discharged wastewater from battery manufacture which passed through chemical treatment process using 50% NaOH solution still contained some of lead ion (Pb2+). This showed that though the amount of this ion was within the standard, chemical treatment process lacked the ability to eliminate 100% of lead ion from wastewater. Ozone is a strong oxidizing agent. Due to this property, ozone could oxidize many toxic heavy metal ions when it decomposes. This research, then, used ozone to increase the efficiency of wastewater treatment from battery factory for lessening of lead ion contamination to 0% or dropping as much as possible to preserve the environment. Results revealed that the amount of lead ion reduced inversely with the increasing of ozone concentration (R2 = 0.840) and, when the quantity of ozone was steady at 600 mgO3/hr, the rising of time for ozone treatment made the number of lead ion contrarily decline (R2 = 0.872). Hence, treatment by high pressure plasma system of ozone technology could decrease lead ion contamination in discharged wastewater from battery manufacture around 71.42-85.71%

The development and design of wastewater treatment from battery factory by high pressure plasma system of ozone technology