Zero Liquid Discharge Method for High Silica Solutions

摘要

Disclosed are zero liquid discharge (ZLD) processes that utilize naturally occurring or supplemental silicate in the water supply for removing magnesium and calcium hardness from aqueous alkaline streams in the form of a silica gel, thereby allowing separation of a low hardness supernant for recycling.

主权项

1. A method of treating an aqueous alkaline stream having a high silica content in order to reduce liquid discharge comprising:
reducing an initial pH of the aqueous stream to a treatment pH sufficient to induce formation of a silica gel and a supernant; and separating the silica gel from the supernant.