Abstract
The anaerobic digestion has been proved to be effective in treating fracturing flowback fluid. However, the high salinity in fracturing flowback fluid seriously inhibits the anaerobic treatment performance. A new strategy was proposed to improve the anaerobic digestion of fracturing flowback fluid under high salinity stress by adding anthraquinone-2,6-disulfonate (AQDS) in this study. The results showed that the addition of AQDS (45 mg/L) effectively alleviated the inhibition of high salinity (25 g/L) on the anaerobic digestion of fracturing wastewater, COD removal efficiency and cumulative methane yield increased by 17.8 % and 30.2 %, respectively. AQDS could alleviate the damage of anaerobic microorganisms caused by high salinity, the proportion of the damaged cells in anaerobic granular sludge decreased from 68.9 % to 38.3 %. Moreover, AQDS promoted the metabolic activity of anaerobic granular sludge under high salinity stress. The specific methanogenic activity, coenzyme F420 and dehydrogenase of anaerobic granular sludge increased by 30.0 %, 21.1 % and 21.4 %, respectively. Electrochemical analysis results showed that the addition of AQDS improved the electron transport of the anaerobic digestion system, and electron transport system activity increased by 62.4 %. This study provides an attractive strategy to alleviate the inhibition of high salinity on anaerobic digestion performance of fracturing flowback fluid.
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