Water treatment process for high salinity produced water

A waste water treatment system for a high saline waste water feed stream, the system comprising:

• an electrocoagulation system in fluid communication with a high saline waste water feed stream, the electrocoagulation system comprising a reaction basin with a set of vertically arranged reaction plates that are spaced apart and an electrical voltage is applied to selected members of the set of vertically arranged reaction plates by placing the selected members of the set of vertically arranged reaction plates in electrical contact with a voltage source to thereby create an electrical field within the reaction basin, and the treatment of the high saline waste water feed stream in the reaction basin takes place at unadjusted pH;
• a clarifier in fluid communication with the electrocoagulation system, further feeding an ultrafiltration feed tank;
• an ultrafiltration system in fluid communication with the ultrafiltration feed tank;
• a forward osmosis draw solution tank in fluid communication with the filtrate from the ultrafiltration system;
• a forward osmosis system in fluid communication with an impaired water used as a feed solution and the draw solution fed from the draw solution feed tank;
• a forward osmosis dilute draw water reverse osmosis system in fluid communication with the forward osmosis draw solution feed tank;
• a lime soda softener system in fluid communication with the forward osmosis concentrated feed water storage tank, comprising a lime and soda precipitation softener vessel;
• a sludge storage tank in fluid communication with the lime and soda precipitation softener vessel, wherein contacting the forward osmosis concentrated feed water with lime and sodium carbonate (soda ash) in the lime and soda precipitation softener vessel produces a particulate suspension that settles to produce a sludge that is recycled back to the lime addition tank in fluid communication with the inlet alkalization tank prior to the lime and soda precipitation softener vessel;
• a forward osmosis concentrated feed water ultrafiltration system in fluid communication with the lime and soda precipitation softener vessel;
• a forward osmosis concentrated feed water reverse osmosis system in fluid communication with the forward osmosis feed water ultrafiltration system;
• and
• a pure water discharge system in fluid combination with both reverse osmosis systems, wherein the combined high purity water may be subject to remineralization by the addition of a calcium salt such as calcium chloride in order to meet a Sodium Adsorption Ration (SAR) less than 6.