OPTIMIZATION OF COAGULATION-FLOCCULATION PROCESS FOR TREATMENT OF INDUSTRIAL TEXTILE WASTEWATER USING NOPAL CACTUS POWDER

Tóm tắt

Using natural coagulants derived from available and popular plants ensures the quality of wastewater
discharged, saving costs for businesses, environmentally friendly. SEM results show that surface of the
material is rough with the multi-layered structure that increases the contact areas, deep holes with undefined shapes on materials will increase diffusion and absorption of dirty residues of different sizes. To investigate the effectiveness of textile wastewater treatment by dried Nopal Cactus powder, the Jartest model was used to identify the best parameters for handling color levels and chemical oxygen demand (COD) treatment of artificial wastewater sources. Jartest experiment identified the best values for removing color levels and COD:
pH = 3, dried Nopal Cactus powder amount of 100mg/L, stirring velocity of 40 rpm; stirring time of 10
minutes. The efficiency of processing color levels and COD with the best parameters are 87.85% and 60.21%, respectively. Regarding the efficiency of processing textile wastewater, there shows an average color reduction efficiency (52.89%), low-level COD treatment (25.56%). Optimal result: with dyeing textile
wastewater sample, the input COD value is 260 mg/L, the color level is 470Pt-Co. The experiment with 36
test modes is run by STAGRAPHIC XV software and analyzed by ANOVA combination of 2 variables COD and color levels, the results with the highest performance for the color level and COD are 77.07% and 59.11% respectively. The optimal pH value is 2.6, the amount of dried Nopal Cactus powder is 80 mg/L, stirring velocity is 40.0 rpm, the time is 8.2 minutes