《Table 4–Average number of chlorine/biphenyl for total PCB discharges from intermittent and continuo

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《Distribution of polychlorinated biphenyls in effluent from a large municipal wastewater treatment plant: Potential for bioremediation》

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The evaluation of the PCB abundance and homolog analysis in the two effluents from the large municipal WWTP showed the presence of high levels of PCBs.In the continuous effluent，the average number of chlorines per biphenyl over the five-year period was 3.94±0.28 chlorines per biphenyl compared to4.87±0.30 chlorines per biphenyl for intermittent effluent.Furthermore，the number of chlorines per biphenyl for west and east primary influents were also calculated based on two sampling events at November 10，2010 and June 14，2017respectively（Appendix A Table S1）.The average number of chlorines per biphenyl was 4.42 and 5.03 for the west primary influent and 4.41 and 4.4 for the east primary influent.These two types of primary influents were directly discharged into the WWTP without any physical and biological treatment resulting similar characteristics of wastewater to the intermittent effluent that discharged through the stormwater overflow during wet weathers after the primary treatment process.Therefore，this difference indicated that stormwater can quickly travel through the sewers thereby showing no PCB organohalide respiration.