The development of shale gas is a state key energy strategy, the potential environmental risks caused by the flowback water have attracted attention. To develop the economical and environmentally friendly biological treatment technology for the flowback water, the activated sludge from the sewage treatment plant was used as the test subject in this study. The inhibitory effects of the organic oxidation activity and the nitrification activity of activated sludge was analyzed through the respiratory measurement experiment. The inhibitory effect of glutaraldehyde, benzalkonium chloride (ADBAC) and salinity on the activated sludge were further identified. The flowback water had very weak inhibition on the organic oxidation activity and very strong inhibition on the nitrification activity, and the 50% inhibitory concentration (IC50) were 75.5% and 10.09%, respectively. The IC50 of glutaraldehyde, ADBAC and salinity to the nitrification activity on activated sludge were 0.0589, 0.0194, 3.63g/L, respectively. The biological treatment of organic pollutants in flowback water was feasible, but it didn¢t work well on denitrification. Salinity, glutaraldehyde and ADBAC had inhibitory effect on the nitrification activity. IC50 of the bactericide was in an order of magnitude difference from the IC50 of the salinity, and the influence of the bactericide need to be paid more attention during biological treatment of the flowback water.
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