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Water and Wastewater Plant Directory
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Vellore District, Tamilnadu, India
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Ranipet Tannery Effluent Treatment Co. Ltd.
Common Effluent Treatment
Plant, V.C. Mottur, Vannivedu, Walajah
Vellore District, Tamilnadu, 632513
India
Contact Information:
Contact: I. Sajid Hussain, Plant Manager
Email:
isajidh@rediffmail.com
Telephone: +91-4172-570529
Fax: +91-4172-274812
Plant Operation: Industrial
Processing: Wastewater
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Web site:
http:/www.ranitec.com
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Plant/Process Description:
Ranipet, a town about 120 Kms from Chennai has a
large concentration of tanneries processing
skins hides from raw to finish. Born out of the
urgent need to control pollution, several
centralized treatment facilities were planned.
The Ranipet Common Effluent Treatment Plant
(Ranitec) at V.C. Mottur is one of such
successful facilities catering to the needs of
76 tanneries.
The effluent from the tanneries spread over an
area of 3-4 sq. Km is collected and transported
to the treatment plant through a system of
pumping stations, pressure and gravity mains.
The total length of the pipe work is about 10
km.
Unique Features of the CETP:
The plant is designed to handle about 4000
cum/day of effluent, making it one of the
Largest Common Effluent Treatment Plant (CETP)
for tannery wastewater in the country. Some of
the other unique features of this treatment
facility are :
• India’s first CETP to achieve the highest
International Standard for Quality - the ISO
standard. The CETP achieved ISO 9002 Certificate
on 15th November 1999 and is currently ISO
9001 : 2000 certified by DET NORSKE VERITAS
(DNV) , The Netherlands.
• The CETP was up-graded with partial assistance
from Govt. of Tamilnadu under the ASIDE scheme
at a cost of Rs. 16.7 million with technical
assistance from Central Leather Research
Institute (CLRI). Under this scheme new
equipment like submersible Mixers, Diffused
Aeration System, additional Secondary Clarifier,
Pressure Sand Filters and Activated Carbon
Filters and Plant Automation works were carried
out Anaerobic lagoon and Degassifier tank were
removed from the process scheme. Phase II
upgradation comprising of a Reverse Osmosis
System for waste water recycling and re-use and
a secured land fill is also proposed.
• The CETP has been selected under the HRD
mission of Govt. of India for conducting Tannery
waste management courses for over 1050
professional including CETP / IETP managers,
workers, faculty and students of universities in
the next three years. A MoU has been signed
between CLRI, All India Skin and Hide Tanners
and Merchants Association (AISHTMA) and RANITEC
for this purpose.
•First and the only Tannery CETP to have
installed Electromagnetic flow meters in all
operating member tanneries and implemented flow
based maintenance charges since 1999. This also
complies with the Charter for Corporate
Responsibility for Environmental Protection
(CCREP), 2003
• This plant was Co-sponsored by the United
Nations Industrial Development Organization
(UNIDO) until 2001 and considered a model CETP
for the South East Asian region, under an
agreement signed by RANITEC and UNIDO’s Regional
program office in Chennai.
• A computerized operations management system is
now under implementation.
Process Description:
The effluent from different tanneries flow
through a Mechanized Bar Rake Screen to the
Receiving Sump, from where it is transferred to
the presettler units, for removal of easily
settleable coarse solids. The overflow from this
unit is passed through a rotary fine screen
(which screen solids> 3 mm) before discharge
into the Equalization Tank. Submersible mixers
have been installed in the Receiving Sump (1
No.) and Equalization Tank (6 Nos.) for complete
mixing of the tanks.
The effluent from the Equalization Tank is
chemically treated with lime and alum in the
flash mixer and polyelectrolyte is added in the
baffle channel to facilitate coagulation and
flocculation of solids which is sedimented in
the primary clarifier and removed to the Sludge
Drying Beds or Centrifuge. A pH of 8.5 to 9.0 is
maintained in the Primary Clarifier to
precipitate the chromium (Cr3+) (From chrome
tanning effluents) as chromium hydroxide. The
above-mentioned primary treatment removes 65-70%
and 40-45% of incoming suspended solids and BOD
as well as precipitating most of the
chromium.
The overflow from the clarifier is further
treated in an Extended Aeration Type Activated
sludge process (Aeration tanks - 1.2 days HRT)
with Diffused Aeration System. Three blowers of
2000 m3/hr capacity each have been installed to
maintain a D.O2 of 1.5 mg/l. The outflow from
the clarifiers have a BOD of around 30 mg/1. To
further improve the effluent characteristics and
colour, the effluent is passed through Pressure
Sand Filters and Activated Carbon Filters after
the addition of Alum and polyelectrolyte in the
flash mixer and flocculation in the
flocculator.
The treated effluent meets the discharge
standards of Tamil Nadu Pollution Control Board
(TNPCB) for which the plant has been designed.
(Refer Section - Plant Performance) The CETP is
now being modified to meet Tamil Nadu Pollution
Control Board (TNPCB) Standard for TDS and
Chlorides. A Reverse Osmosis (R.O.) System will
be installed for this purpose. The treated waste
water will be recycled back to the member
tanneries as process water.
The Sludge from the Primary and Secondary
clarifiers is discharged to the Sludge Drying
Beds or to the mechanical centrifuge for
dewatering. The back washing effluent from Sand
filters and Activated Carbon Filters is
discharged back to the Receiving Sump. The dried
sludge is then disposed of to the sludge
landfill.
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Owner:
Owned by Tanners Asssociation (Public Ltd. Company)
Web site:
http://www.ranitec.com
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Operating Company:
Ranipet Tannery Effluent Treatment Co. Ltd.
Web site:
http://www.ranitec.com
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Directions:
120 Kms North of Chennai, Capital City of the State of Tamilnadu.
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Disclaimer:
Water and Wastewater.com provides the information on
this page for reference purposes only. We do not certify
the accuracy of the information provided by third-party
individuals for this listing.
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