Arsenic found in ground water. Arsenic is a semi-metal element in the periodic table. It is tasteless.It is also harmful for human body.
* Co-precipitation and adsorption processes
* Lime treatment
* Naturally occurring iron
* Sorptive media
* Ion exchange
* Membrane techniques
* Microbial processes
There are many way to remove arsenic from drinking water. Some of them are:
* Co-precipitation and adsorption processes
* Lime treatment
* Naturally occurring iron
* Sorptive media
* Ion exchange
* Membrane techniques
* Microbial processes
A comparison of main arsenic removal technologies
Technologies
|
Advantages
|
Disadvantages
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Co-precipitation
·
Alum coagulation
·
Iron coagulation
·
Lime softening
|
·
Relatively low capital coast.
·
Relatively simple operation
·
Common chemicals available.
|
·
Produces toxic sludges.
·
Low removal of As(III)
·
Pre-oxidation may be required.
·
PH adjustment
required.
|
Sorption techniques
·
Activated alumina
·
Iron coated sand
·
Ion exchange resin
·
Other sorbents
|
·
Relatively well-known and commercially available
·
Well-defined technique
·
Plenty of possibilities and scope for development.
|
·
Produces toxic solid waste.
·
Replacement/regeneration required.
·
High-tech operation and maintenance. Relatively
high cost.
|
Membrane techniques
·
Reverse osmosis
·
Electrodialysis
|
·
Well-defined and high removal efficiency
·
No toxic solid wastes produced.
|
·
High-tech operation and maintenance.
·
Toxic waste water
produces.
|
Microbial processes
·
Microbial oxidation
·
Microbial removal
|
·
Should be less costly
|
·
Not yet fully established.
·
Required extensive research.
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