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
:
SICGIL
INDIA LIMITED
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 :
sicgil@vsnl.com,
vijay@sicgil.com,
Contact
Persons |
V.N.Vijay
Kumar |
|
Mobile
no:98402 53253 |
Ruqshad
Dadabhoy |
|
|
_____________________________________________________________________
At : Bangalore, Chennai, Cochin, Coimbatore,
Goa, Hyderabad, Indore, Kakinada, Kolkata,
Madurai, Mumbai, Surat, Tuticorin, Vadodara,
Vizag.
