[Ozone-Biological Activated Carbon for Advanced Removal of Typical Persistent Organic Pollutants from Micro-Polluted Source Water in the Yangtze Delta Region].

Ozone-biological activated carbon (O3-BAC) was studied for the advanced removal of organics from micro-polluted source water in the water supply plant P located in J City in the Yangtze Delta Region. The results show that 19.2% of the permanganate index, 10.4% of total organic carbon, and 23.0% of UV254 were removed by the advanced treatment of O3-BAC. Eight types of polycyclic aromatic hydrocarbon (PAH), 16 types of organochlorinated pesticides (OCPs), and five types of haloacetic acids (HAAs) were detected in the source water. The total concentrations were 53.9-100.0, 6.5-41.8, and 2.5×103-1.1×104 ng·L-1, respectively. The advanced O3-BAC treatment removed 32.5% of PAHs and 25.9% of OCPs, greatly improving the effluent of the conventional water supply process. However, HAAs were mainly removed with the conventional process, with a removal rate of 33.8%-87.0%. After the advanced treatment with O3-BAC, the amount of chloroacetic acid slightly decreased, while the concentration of bromoacetic acid slightly increased.