1.800.880.4808
APEC WATER
Products Filters Parts F.A.Q.s Promotions My Account View Cart
Reverse Osmosis Technlogy Water Education
& Your Health
Customer Reviews
& Testimonials
Talk to a WQA Certified
Water Specialist
 
Welcome to APEC Water!

We are America's leading supplier of high quality drinking water systems and information source.
 
 
 
Charity Penguin

At APEC, we strive to provide the best drinking water available to everyone. Even if it means offering a free system to those in need.

Click here to learn more about our Free Drinking Water Donation Program.

Embracing Happiness

 

 

 

 

WHAT IS A TYPICAL CONCENTRATION FOR SILICA (SiO2) or SILICATES IN FRESH SURFACE AND GROUND WATER SUPPLIES ON EARTH?

| 2

Silica (SiO2) is an oxide of silicon, and is present in almost all minerals: It is found in surface and well water in the range of 1 - 100 mg/i. Silica is considered to be colloidal in nature because of the way it reacts with adsorbents. A colloid is a gelatinous substance made up of non­diffusible particles that remain suspended in a fluid medium. Silica is objectionable in cooling tower makeup and boiler feed water. Silica evaporates in a boiler at high temperatures and then redeposits on the turbine blades. These deposits must be periodically removed or damage to the turbine will occur. Silica is not listed in the Primary or the Secondary Drinking Water Standards issued by the US EPA.

Where does Silica come from?

The solid crust of the earth contains 80 to 90 compounds of silicon such as silica or silicon dioxide. Most silicate salts are only slightly soluble in water and are widely distributed in nature. Minerals such as asbestos, mica, talc, lava, etc. contain silicates.

Silicate is a common contaminant in most waters because of the many natural deposits that dissolve in water over time. Natural physical and chemical weathering processes also produce many extremely small particles or colloids of silicate materials. In the water, all sorts of algae require phosphorous and nitrogen as nutrients; but only diatoms (a type of algae) also requires silicate for growth. Increased silicate concentration causes increased production in the “trophic levels” of the food chain. This directly relates to the increased zooplankton biomass and increased fish biomass.

Outside of the water, sodium silicates are used in several raw materials for making silica gel. Some examples of materials using silica are pottery, stoneware, fireproofing paper, wood, cement, fixing pigments in paintings, cloth printing and for preserving eggs.

Increased silicate concentrations will affect the water ecosystem and the possibilities for use of the water system by humans. In water treatment, we are concerned with silica because of its capacity to form scale deposits on surfaces it comes in contact with. In its colloidal form it consists of very fine particles in suspension. The current removal processes of silica are filtration, chemical precipitation, reverse osmosis, and strong base and ion exchange.

| 2

 

Related Articles:

What are silicates and why are they in water?
The Methods for Controlling Corrosion Problem
Silica in drinking water

 

Follow up on Twitter APEC Water - Twitter Or become our fans on facebook APEC Water - Facebook Social Network