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Researchon the removal of chemical oxygen demand and surfactants in commercial laundry wastewater by coagulation-flocculation process
Summary
Researchers investigated coagulation-flocculation treatment of commercial laundry wastewater, which contains significantly higher chemical oxygen demand (COD) and surfactant concentrations than domestic wastewater. Jar test experiments showed that poly aluminium chloride (PAC) at pH 7 and 60 mg/L dosage outperformed FeSO4·7H2O in reducing COD and surfactants to discharge standards.
Wastewater from public commercial laundry facilities has significantly higher concentrations of chemical oxygen demand (COD) and total surfactants compared to domestic wastewater.As the number of these facilities increases, the volume of wastewater generated also rises, necessitating classification and treatment to meet standards before being discharged into the common drainage system.The Jar test experiment in this study demonstrates that poly aluminium chloride (PAC), under optimal conditions (pH=7; dosage of 60 mg/l), is more effective than FeSO7HO in treating commercial laundry wastewater.Specifically, after treatment, the parameters total suspended solids (TSS), turbidity, and color all comply with the requirements of column A of QCVN 40:2011/BTNMT.Although the COD concentration post-treatment remains elevated (341 mg/l), PAC has significantly reduced non-biodegradable organic substances and improved the five-day biochemical oxygen demand/chemical oxygen demand (BOD5/COD) ratio to 0.52, facilitating subsequent biological treatment processes.Notably, the close correlation between COD removal and total surfactants indicates that the coagulation-flocculation mechanism, along
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