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Pilot-scale O3/BAC process for the advanced treatment of the Songhuajiang River, northeast China

To increase the safety of drinking water supply for residents, the O3/BAC (ozonation and biological activated carbon filtration) advanced treatment was investigated through a pilot-scale water plant in Harbin City. Results indicated that the raw water of the Songhuajiang River contained a high content of turbidity, chemical oxygen demand (CODMn), and NH3–N, which resulted in substandard water quality via the conventional treatment. However, after treatment by the O3/BAC process, the average removal rates of turbidity, CODMn, NH3–N, UV254, total organic carbon, and trihalomethane formation potential in effluent were 97.97%, 84.84%, 64.29%, 87.39%, 72.09%, and 78.67%, respectively. The combined effect of the pre-ozonation and O3/BAC process also eliminated the precursors of disinfection by-products from water. The results indicate that the O3/BAC process is effective and promising to treat water from the Songhuajiang River. Moreover, the stable operation of the system confirmed that it can meet the effluent requirements of the “Standards for drinking water quality” (GB5749-2006), and also ensure minimal fluctuations in the treated water.