MULTI-STEP SYSTEM FOR TREATING SELENIUM-CONTAINING WASTEWATER

摘要

This specification describes a process and apparatus for treating water comprising selenium. A process is described having the steps of treating the wastewater influent using a biological reduction process to produce an intermediary stream and reducing the concentration of unconsumed constituents in the intermediary stream by means of filtration optionally with upstream coagulation or flocculation. When compared to the wastewater influent, the intermediary stream preferably has reduced concentration of the selenium species when compared to the wastewater influent. When compared to the intermediary stream, the effluent preferably has reduced concentration of one or more of the inorganic non-metallic constituents (such as nitrogen, phosphorous and sulphur), metallic constituents or organic constituents. An apparatus is described herein having a fixed film reactor configured to receive a wastewater influent, and a membrane filter configured to receive effluent from the fixed film reactor.

主权项

1. A process for treating wastewater containing selenium comprising the steps of:
a) receiving an influent comprising wastewater to be treated in a biological reactor; b) biologically treating said influent to produce a first intermediary stream containing reduced concentration of selenium species; c) adding a chemical agent into said first intermediary stream to produce a second intermediary stream; and d) filtering said second intermediary stream to produce effluent containing reduced concentrations of one or more of an unconsumed organic, metallic or inorganic non-metallic constituents.