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Role of Carbon Di-oxide (Co2) for
Complete Effluent Water Treatment


Carbon Dioxide with its varied inherent properties suits for effluent water treatment.

pH reduction assumes more importance in a wide range of user segments in the treatment of water treatment. Acids are being used to neutralize the alkalinity in the effluent. Acids have many inherent side effects, resulting in significant (hidden) cost addition.

With Pollution Control Boards setting stringent norms and deadlines for upgrading the existing systems, many user segments have turned to eco-friendly, cost-effective, easy-to-use, carbon dioxide (Co2).

Method of using Co2

Co2 is injected into the system through sparger or spray nozzle. Co2 flow and the pH level are controlled either manually or using an automatic flow meter. Liquid Co2 injection is recommended for high Co2 flow rate and short residence time.

Co2 combines with water to form carbonic acid which inturn disassociates to form bicarbonates and hydrogen ions. Bicarbonates further dissociates into carbonates and hydrogen ions and lowers pH.

Advantages of Co2 instead of acids for Total Effluent Control

Use Co2
Use Co2 Instead of Acids
For getting Benefits
Less Expensive.
Expensive. Requires air respirators, eye protection, safety showers, eye wash stations & protective clothing
Project cost of Co2 usage requires short pay back period.
Non Hazardous, Non-corrosive, safe
Hazardous, corrosive, unsafe
Weakly acidic nature of Carbonic acid ensures employees & factory safety.
Automatic process thus requires less labour
Need more labour
Eliminates operation hassle and ensures reduced labour costs.
Self-buffering, reduces high pH levels quickly
pH Excursions. pH slips into low levels.
After reaching neutral pH, Co2 ensures precise end-point control without danger of overshooting into undesirable low pH levels.
No dangerous or corrosive by products
May form sulphides / chlorides which pollutes water and air streams.
Non-corrosive to pipes & equipment ; ensures extended equipment life. Co2 ensures reduced sulphur emissions and releases environmental friendly carbonates and bicarbonates.
Co2 maintains very low level of calcium hardness in RO feed.
Acids produces undesirable calcium hardness.
Calcium scaling not much in RO membranes thus increasing its life.
Less Chloride in RO feed results in good quality product water from RO membranes.
Chlorides / sulphides in treated water lead to poor performance of DM unit, thereby increasing its production & maintenance costs.
Acids increases the cost of demineralisation of treated water ; life as well as productivity of RO membrane is reduced due to acid.
Requirement of Co2 (with 99.98% purity) is lesser compared to acids
Purity of Sulphuric acid is 93% and that of Hydrochloric acid 35%
Requirement of Co2 is 1.25 times lower than H2SO4 and nearly 3 times than HCl acid.

For any information / Co2 requirements, contact :

VI Floor, Dhun Building, # 84, (Old No. 827), Anna Salai, Chennai-600 002.
Phone : 91 - 044 - 2852 1644 / 2852 1467 / 2852 0657 / 2852 0870
Fax : 91 - 044 - 2852 1249, E-mail :,,
Contact Persons
V.N.Vijay Kumar
Phono No: 044 39850715/728
Ruqshad Dadabhoy

At : Bangalore, Chennai, Cochin, Coimbatore, Goa, Hyderabad, Indore, Kakinada, Kolkata, Madurai, Mumbai, Surat, Tuticorin, Vadodara, Vizag.


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