Removing Iron from Drinking Water

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Removing Iron from Drinking Water - Description

Iron in drinking water Guidelines. Iron is essential for humans. Where does the iron that we need come from??. Usually from the food that we eat – not necessary in water. Canadian Drinking Water Quality GL is . ID: 266790 Download Presentation

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Removing Iron from Drinking Water




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Presentations text content in Removing Iron from Drinking Water

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Removing Iron from Drinking Water

Slide2

Iron in drinking water Guidelines

Iron is essential for humans

Where does the iron that we need come from??

Usually from the food that we eat – not necessary in water

Canadian Drinking Water Quality GL is

0.3

mg/L

Slide3

Why have these guidelines?

Iron GL are for aesthetic reasons only – no health risks with iron and iron bacteriaDiscolour waterPromote bacterial growth

Slide4

Problems with Iron Bacteria

Iron bacteria will grow & build up anywhere water flows

Forms

thick layers of “biofilm” in pipes

Difficult and expensive to repair

Water has unpleasant smell

Bad for washing and cooking

All iron needs to be removed from water to stop bacteria

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More about Iron

Iron can be in a reduced state - Soluble in water – water in a well

Iron can be in an oxidized state (rust) – NOT soluble in water – well water that has come in contact with oxygen

Iron must be oxidized from drinking water -i.e. totally removed!

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Filtering Iron out of Drinking Water

Three main methods of oxidizing iron:

Simplest method – settling – let the water sit in a reservoir, exposed to oxygen and most of the iron will settle to the bottom of the pool

This is a slow process

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Filtering Iron out of Drinking Water

Use oxidizing chemicals

Cause iron to clump in tiny lumps that will then be filtered out of the water

Filters must be very fine and

they clog

up easily

Usually add a flocculent – causes bigger clumps that are more easily filtered out

Clumps are called a “

floc

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Filtering Iron out of Drinking Water

A different process is the use of a biological process

Water is passed through a filter containing bacteria that will oxidize the iron

Iron bacteria take in reduced iron (dissolved in water) and make it into oxidized iron through a Bio-oxidation reaction

Form a natural

floc

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