METHOD FOR PURIFYING AQUEOUS STREAM, SYSTEM AND PROCESS FOR OIL RECOVERY AND PROCESS FOR RECYCLING POLYMER FLOOD

摘要

A method for purifying an aqueous stream comprising silica of a first concentration is provided. The method comprises: treating the aqueous stream with an electrocoagulation (EC) process to obtain a purified stream comprising silica of a second concentration lower than the first concentration. Optionally the aqueous stream may be produced water or have a temperature in a range of from about 60 °C to less than about 100 °C. At the same time, a system for enhanced oil recovery, a process for recycling polymer flood produced water and an oil recovery process are also provided.