Apparatus and method for recycling blackwater and greywater at oil and gas well sites

A water treatment system, comprising:

• a bioreactor comprising:
• a tank configured to receive an influent liquid;
• a separator structure positioned in the tank, the separator structure having a frustoconical shape and defining an opening proximal to or at a bottom of the separator structure, wherein an interior of the separator structure is in communication with the tank, external to the separator structure, at least via the opening;
• an aeration vent positioned in the tank and configured to direct air into the tank, but not directly into the interior of the separator structure;
• and
• an effluent outlet communicating with the interior of the separator structure, proximal to a top of the separator structure, wherein a relatively clean effluent liquid, in comparison to the influent liquid, exits from the separator structure via the effluent outlet;
• a filter tank in fluid communication with the effluent outlet of the tank;
• an ozone generator in communication with and downstream of the filter tank, for oxidizing the effluent liquid.