List of Water Treatment methods for Drinking water | Effluent water

Many guys are asking frequently, what are the Technologies / treatment process are available to Drinking as well as Effluent Water Parameter?  numerous methods that are available to control or removal the impurities presents in the water.

Generally in textile effluent Color removal is very difficult Task. similarly in the same plant, the feed water of Reverse Osmosis plant turbidity will not maintain uniformly.

Though several methods are available only few system that are adopting in globally, many factors are involve for selection criteria

1. cost of technology

2. that technology must be given uniform result

3. It must be upgrade-able one.

4. the process / system’s running cost as well as recharge the system (ex. media of softning plant, membrane of RO like.,) that must be reasonable one.

Note the available method.

For Color Removal

Coagulation/rapid sand filtration
Adsorption
• Granular activated carbon (GAC) media
• Powdered activated carbon (PAC) addition
• Synthetic resins (ion exchange)
Oxidation
• Ozone
• Chlorine
• Potassium permanganate
• Chlorine dioxide
Nanofiltration

Taste and color control

Oxidation
• Ozone
• Chlorine
• Chlorine dioxide
• Potassium permanganate
BAC adsorption

Bacteria, viruses removal

Partial reduction–filtration
Inactivation—disinfection
• Chlorine
• Chloramine
• Chlorine dioxide
• Ozone
• UV

 Turbidity-particulate reduction

Filtration technique 
• Rapid sand—conventional
Coagulation & Flocculation
• Clarification
Plain settling
Plate settlers
Solids contact
Dissolved air flotation
Filtration
• Rapid sand–direct mode
Slow sand filtration
• Diatomaceous earth filtration
• Membrane filtration
Ultrafiltration
Nanofiltration
Reverse osmosis

Disinfection by-product control

Precursor reduction
• Enhanced coagulation
• GAC adsorption
• Biologically activated carbon (BAC) media–
preozonation
• Nanofiltration

Iron, manganese reduction/sequestering

Filtration of precipitators formed by preoxidation
• Sand and/or anthracite media
• Green sand media
• Proprietary media
Polyphosphate sequestering agent

Hardness reduction

Lime softening
• Ion exchange
• Nanofiltration

Inorganic, organic chemical reduction

Ion exchange
Biologically activated carbon media
Adsorption
Reverse osmosis

Corrosion control

Posttreatment
• pH adjustment
• Inhibitors

Before going to adopt any technology into your process, think carefully with available right technician and do tiny pros and cons list of each system personally.

Article by Sivanandan

T.P.Sivanandan

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