Optimization of Ink Wastewater Treatment by Ozonation

Abstract

The objective of this research is to study the optimum condition of the color removal of inkwastewater by ozonation. Central composite design was applied with three independent variablesnamely, organic loading, pH and reaction time in the ranges of 650-1950 mg/l, 3-11 and 10-60min.,respectively. Constant air flow rate of 700 cm3/min and ozone dose of 27.6 mg/l were generatedfrom an ozone generator operated by the electrical corona discharge. The decoloration efficiency isincreased with increasing pH and the reaction time while the efficiency is decreased with increasingthe organic loading. Statistic analysis indicating that the optimum process condition was organicloading of 650 mg/l, pH of 8.7 and treatment time of 20 min. Verification results at this conditiongave an error less than 1.5 % for all response parameters.