Patent ID: 9567249
Date: 2017-02-14
CPC Classifications: C02F

Claim:
1. An integrated process for removing selenium from a water source containing selenium, the process comprising: filtering a first water feed stream including water from the water source with a membrane filtration process to produce a first water product stream having a reduced selenium content and a first retentate; separating sulfate from the first retentate to produce a stream including removed sulfate and an overflow stream depleted in sulfate; treating the overflow stream to produce a second water product stream having a selenium content less than a selenium content of the first retentate, and a concentrate by metabolically reducing selenium ions in the overflow stream with bacteria under anaerobic conditions; combining a first portion of the second water product stream with the first water product stream to produce a process effluent having a selenium content less than or equal to a predefined maximal selenium content; and combining a remaining portion of the second water product stream with the water from the water source to generate the first water feed stream.