Managing Metals in water & waste water using Chemisorption
Pete Avila
Managing Metals in Waste & Water using advanced Chemisorption media
Heavy Metals such as Arsenic, Copper, Nickel, Lead, Fluoride, Silica, Boron, Mercury, Selenium, Chromium & many other metals, can be removed using advanced Chemisorption media. Chemisorption media for water treatment, with high macro porosity spheres, removes by formation/chemisorption with an aluminum silicate complex, at a pH of 4 – 10. Operational advantages are temperatures up to 140 degrees making it cooling tower, process water, and boiler water pretreatment suitable. This is especially good when using waste water for recycling purposes. The chemisorption media is also ecologically good for the environment as it passes the TCLP test and can be land fillable. Chemisorption’s functionalized chemistries throughout each granule covalently bond contaminants.
Silica Removal
Silica has the ability to polymerize and scale as its concentration increases. It is often a limit in process applications. In desalination of brackish water it is a major membrane foul-ant that limits recovery. In cooling systems, silica limits cycles of concentration and water reuse. The removal of soluble silica can allow an increase in the cycles thereby reducing makeup water and chemical treatment costs. The activated alumina substrate of the media provides removal through the formation of aluminum silicate.
Arsenic Removal
The functionalized activated alumina composition of Chemisorption media provides a strong adsorbent for the reduction of arsenic from industrial wastewaters. Chemisorption The media is proficient for both arsenic (III) and arsenate (V). Typical expected removal rates of arsenic (V) are 90–99% and 70-90% for arsenic (III) with an expected 20% weight capacity if the arsenic is in a soluble form. There are special media, formulated for targeting Mercury, Lead, Fluoride, & Copper & more. Chemisorption has the heaviest weight removal capacity (up to 90% by weight) over most competitive media.