Desalination and softening of produced water

A process for treating produced water comprising:

• deoiling a produced water to form a substantially deoiled produced water;
• passing the deoiled produced water through a microfiltration membrane comprising an ion-exchange functionality under conditions sufficient to produce a water suitable for a steam flooding application;
• wherein water suitable for a flooding application comprises a total dissolved solids content of less than about 30,000 ppm and a hardness of less than about 400 ppm;
• wherein the deoiling comprises a combination of employing corrugated plate interceptors and induced gas floatation;
• and
• wherein the microfiltration membrane comprises an ion-exchange functionality comprises a membrane comprising a polyvinylidene difluoride, a polyacrylonitrile, or a combination thereof with an ion-exchange functionality comprising a sulfonic acid functional group, a carboxylic acid functional group, or a combination thereof.