engleski

Wastewater reuse for irrigation by coagulation and ultrafiltration

This study presents the application of coagulation and ultrafiltration as a combined treatment of rendering plant wastewater. The coagulation was optimized in a wide range of coagulant (FeCl3) dosage (10-80 mg L-1) and pH (4.5-7.5) according to the response surface methodology (RSM) to achieve a minimal turbidity and total carbon with a pH close to 7. The coagulation at optimal conditions was used as the pretreatment to ultrafiltration. The ultrafiltration was performed at 5 bar with 6 commercially available membranes (GK, PT, GM, PU, PW, and MW) that have a wide range of molecular weight cut-off (3-50 kDa). The main water parameters were measured after each treatment step (biological treatment, coagulation, and ultrafiltration) as well as the flux decline during ultrafiltration. The parameters were compared to the regulations and guidelines regarding water reuse for irrigation. After the ultrafiltration, the membranes were washed with an alkaline cleaning agent (Nalco PC 99) for recovering membrane flux. According to the obtained values of measured parameters and flux decline, the best ultrafiltration membrane for wastewater reuse was selected.

wastewater, water reuse, irrigation, coagulation, ultrafiltration

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