To solve the problems of unstable chemical oxygen demand (COD), turbidity and suspended solid (SS) removal for the electrocatalytic process and unstable operation of the subsequent ultrafiltration membrane–reverse osmosis membrane in a centralised fracturing wastewater treatment plant in Inner Mongolia, the integrated dissolved ozone flotation (DOF) process was proposed to replace the original electrocatalytic process. Multiple processes, such as ozonation, flotation, coagulation and decolourisation, can be achieved in one integrated DOF reactor. The results showed that the removal efficiency of COD, colour, turbidity and SS in the DOF process could reach 25.4, 49.9, 95 and 96%, respectively. Meanwhile, the treatment cost was reduced by 47% (i.e., 1.77 RMB/m³ for the DOF process) compared with the electrocatalytic process.

为解决内蒙古某集中压裂污水处理厂电催化过程中化学需氧量（COD）、浊度和悬浮物（SS）去除不稳定以及后续超滤膜-反渗透膜运行不稳定的问题，集成溶解臭氧浮选（DOF）工艺被提出来取代原来的电催化工艺。在一个集成的自由度反应器中可以实现多种工艺，例如臭氧化、浮选、混凝和脱色。结果表明，DOF工艺对COD、色度、浊度和SS的去除率分别达到25.4%、49.9%、95%和96%。同时，处理成本降低了 47%（即 1.77 RMB/m ³ DOF 过程）与电催化过程相比。