Introduction:

Alkaline wastewater is a by-product of many textile industries. A pH adjustment is required by the addition of acidic products. By determining the kinetics of the neutralization reaction between these waters and CO2, the conceived treatment system will be more efficient.

Objective:

Define the rate law for the reaction between textile wastewater and carbon dioxide in the UB “Desembarco del Granma”.

Materials and Methods:

Residual water from the textile process and CO2 were used. Experiments were carried out in a batch reactor. The integral method of kinetic data analysis and non-parametric hypothesis tests were used.

Results and Discussion:

The basic pH of the effluent to the mill is due to the use of NaOH in textile processes. Two non-parametric hypothesis tests for the values of the reaction-specific rate constants (k) reflected standard deviations of 0.171 and 0.76 respectively, higher than 0.05, so there are no significant differences between the four groups considered for each temperature. With the non-parametric hypothesis test for k at 50 and 30 °C, the level of significance (0.001) corroborated the dependence of each k with temperature.

Conclusions:

The specific rate constants for the temperatures of 30°C and 50°C determined are 57.98 and 105.94 L/(mol s) respectively for the neutralization reaction of the textile wastewater with CO2. The reaction is of order 2 presents an activation energy value of 24.5 kJ/mol.

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