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COCONUT (VS) COAL (VS) WOOD ACTIVATED CARBON

Introduction:

 In water treatment applications all the three varieties of carbon (Coconut , Coal & Wood) are used depending upon the nature of treating potable water and waste water. Hence there is a need for a comparative study of various types of carbon based on their specifications.

 The following table shows the technical difference between the three types of carbons based on density, hardness and other parameters:-

SR NO

CHARACTER

COCONUT ACTIVATED CARBON

COAL ACTIVATED CARBON

WOOD ACTIVATED CARBON

1

DENSITY

0.48 TO 0.58 GM/CC (VERY HIGH)

0.38 TO 0.48 GM/CC (HIGH)

0.25 TO 0.30 GM/CC (LOW)

2

HARDNESS

98 % MIN (VERY HIGH)

90 - 95 %  (HIGH)

85% MIN (LOW)

3

ASH

VERY LOW - 3 % MAX

HIGH - 10 % MAX

VERY HIGH - 15 % MAX

4

POROSITY

MORE MICROPORES

MORE MESOPORES & LESS MICROPORES

MORE MESOPORES & MACROPORES

5

WETTABILITY

VERY HIGH

NORMAL

LOW

6

HEAVY METALS

NOT TRACEABLE

PRESENT

LOW

7

BACK WASHING

NEGLIGIBLE LOSS OF MATERIAL

LOW LOSS OF MATERIAL

                      -

8

OPERATION COST

LOW

NORMAL

HIGH

9

AVAILABILITY

RENEWABLE SOURCE (AGRICULTURAL BYPRODUCT)

FOSSILE (LIMITED AVAILABILITY)

RENEWABLE BUT DEPLETING

10

BEST SUITABLE FOR

DECHLORINATION

ODOUR REMOVAL

DECOLORIZATION IN POWDER FORM

11

APPLICATION (MESH WISE)

WATER TREATMENT :

EFFLUENT TREATMENT:

ETP:

8 X 16, 12 X 30, 8 X 30

8 X 30 , 12 X 40 , MINUS 325

MINUS 200

WATERTREATMENT BLOCKS:

 

 

35 X 70, 80 X 325

 

 


Choosing the best solution:

Porosity plays a vital role in choosing the right type of carbon. While Coconut activated carbon contains many micropores , Coal activated carbon contains mainly mesopores as well as as micropores whereas wood activated carbon contains mesopores and macropores only. If the molecular size of the impurities are less than 100 angstroms then coconut carbon can be preferred. Likewise if the molecular size of the impurities are between 100 and 1000 angstroms we can use coal carbon. And if the molecular size of the impurities are greater than 1000 angstroms Wood carbon can be considered.

In general:

  • Wood activated carbon is most suitable for decolorization in powder form.

  • Coal activated carbon is suitable for odor removal.

  • Coconut activated carbon is suitable for dechlorination.

Cost wise coconut activated carbon is little bit expensive compared to coal & wood activated carbon. ”If we are to fill up a vessel of a given volume, the weight of coconut activated carbon required is more due to its high density”. But at the same time there is a negligible loss of material during back washing for coconut activated carbon due to its high hardness. Thus operation cost is low. Wettability is very high, and ash content is very low in Coconut activated carbon. Since it is a renewable source. It is preferable for drinking water treatment and RO water applications. Having said that Coconut activated carbon is best suited for drinking water products.

Coal activated carbon is used in drinking water projects. Apart from that, there are few other industrial applications like Effluent treatment and Waste water treatment. This type of carbon can be best suited for odor removal and cost effective applications.

Wood carbon is mainly used in POWDER applications where “decolorization” plays a vital role.

Conclusion:

Choosing the right form of activated carbon mainly depends upon your applications and cost of operation. Professional guidance is the best way to ensure the right product for a particular application.

© 2015 Kalpaka Chemicals. All rights reserved.

Registered office: 4/133 X, 3 rd Street, Muthammal Colony, Tuticorin - 628002 Tamil Nadu, India

Tel: 0461-2345638,0461-2347669.e-mail(Sales): sales@kalbonusa.com
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