公开(公告)号：US20190169057A1

公开(公告)日：2019-06-06

申请号：US16274295

申请日：2019-02-13

Applicant: Chevron U.S.A. Inc.

Inventor： Sandra HEIMEL

IPC: C02F9/00 ,  C02F1/44 ,  E21B43/40 ,  B01D61/58 ,  C02F5/06

Abstract: Produced water from a crude oil or natural gas production process is purified using a membrane purification system for petroleum production, agricultural, commercial and domestic uses. The produced water is pretreated to remove, at least, particulates and oil from the produced water. The minimally pretreated water is then purified in a membrane purification system that is operated at conditions such that contaminants are removed. In particular, the membrane purification system is operated with pH adjustments to allow boron and ammonia to be effectively removed. In some embodiments, greater than 95% of the boron content and greater than 95% of the ammonia content are removed. Some method embodiments include no separate ion exchange separation step capable of removing ammonia.