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| Ranipet Tannery Effluent Treatment Company Ltd (Ranitec) |
Ranipet is an industrial town about 110 km from Chennai on Chennai-Bangalore national highway. It has an important tannery cluster. There are more than 200 tanneries operating in and around Ranipet town. Apart from the tanneries there are about 51 leather product units, including factories for making shoes, leather goods, shoe components, etc. in and around this town. The total export turnover of the leather industrial sector from this cluster is about Rs.1000 crores per annum.
There are five common effluent treatment units (CETPs) operating for tanneries in Ranipet and adjoining Melvisharam tannery clusters. Apart from the CETPs there are 10 individual effluent treatment plants for the tanneries.
Ranitec CETP is the largest CETP in tannery sector in Tamil Nadu with an installed treatment capacity of 4000 m3/d. It services 77 member tanneries. Ranipet Tannery Effluent Treatment Company Limited, a company, established by the member tanners, is responsible for operation and maintenance of the CETP. It is managed by a Board of Directors comprised of elected member tanners. Mr. Ramesh Prasad, a tanner of the area, is currently the Chairman of the company.
One of the first CETPs to be commissioned in the state, the Ranitec CETP was commissioned in the year 1995. Subsequently, it has been receiving continual technical assistance and support from CLRI, NEERI and UNIDO. Many additional features were added to the original CETP. These include two pre settlers, tertiary treatment etc. Over a period of time, Ranitec CETP has been regarded as a model CETP. Technical personnel from neighbouring countries such as Sri Lanka, Bangladesh, Pakistan, Nepal and Indonesia had come to Ranitec CETP for on the job training under the aegis of UNIDO. |
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| Project Details |
The ZLD system proposed in Ranitec CETP consists of the following: |
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(CETP upgradtion: replacement of the collection and conveyance lines, new mixing system and odour control system in receiving sump, new mechanical screen, pre-settler, New aeration tank with new blowers and diffusers, additional mechanical sludge dewatering, softening to remove hardness and improvement in monitoring. |
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RO system: Pre-treatment filtration, organic scavenger, ultra-filtration, two stage reverse osmosis and automated control system for the same. |
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Mechanical Evaporation of RO reject: Seven effect evaporation with thermal vapour re-compression system and pusher centrifuge for separation of salts. |
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Salt disposal yard: special disposal unit to store generated salt for two years at full capacity |
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Recovered water conveyance system: overhead tanks and piping system with metering for conveying the recovered water back to individual tanneries. Individual tanneries are providing individual storage tanks with more than one day storage capacity.
As a part of the project, it has been envisaged that the effluent from tanneries, numbering Nine, connected to another CETP in the region viz., Meltec, treating combined effluent from tanneries and leather board units, shall be diverted to the ZLD system at Ranitec and Meltec CETP shall be upgraded and maintained as a CETP for leather board units.
The turnkey implementation of the project was awarded to Mumbai based Hydroair Tectonics PCD Ltd based on a two stage competitive tendering. The contract value is Rs. 42 crores and the total project cost including administrative charges is Rs. 44 Crores. |
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| Progress So For |
As on Sep 2011, substantial part of the project implementation is completed.
In the raw effluent collection lines, around 320 manholes out of 360 have been completed. Replacement of pipeline is nearing completion. All essential up gradation works such as flocculator, primary and secondary clarifier mechanisms, aeration tank including diffusers and blowers, two filter presses etc. have been completed and commissioned. The pre-settler construction is nearing completion. The odour control system has just been installed and under commissioning. Plans for repair of the drum screen has been finalized.
Some up-gradation works in Meltec such as new bridges for clarifier, HRTS, compound wall etc. have been completed and the rest of the work shall be taken up later.
All major civil works in the RO section such as treated effluent storage tank, permeate tank, RO reject tank, reactivator clarifier, RO building, flocculator tank, chemical house, etc. have been completed. Flooring work of RO building using special tiles has been completed. The tertiary treatment system too has been commissioned.
Mechanisms such as dual media filters, organic scavenger, micron filter etc. are installed and one stream has been commissioned. UF system has been erected in two streams in the presence of Supplier from Singapore and RO membrane has been loaded and tested. Complete unit upto RO has been commissioned and the units are in regular operation.
In the mechanical evaporator, major items pertaining to Multiple Effect Evaporator including Calendrias, Vapour separators and pre-heaters etc. have been erected. Almost all mechanical components have been supplied. All civil works related to evaporator have been completed. Boiler house is completed. boiler and accessories have been supplied and is under erection.
In the recovered water conveyance, all three Overhead tanks have been completed. Recovered water conveyance lines upto OHT 2 and 3 is nearing completion. Selection of recovered water meters is in process.
Among the associated works, the construction of salt disposal yard has been re-started and construction of RCC wall on sides upto ground level is in progress. Ancillary equipment such as diesel generator, transformer, control panel etc., has been erected and commissioned. The new administration and laboratory building has been completed. A new approach road to the project site, making a direct entry to the site from National Highway has completed. Application for additional power has been made.
Overall, the plant upto RO stage is in trial operation. |
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| Project Target |
| The major activities in the coming months are as follows: |
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Oct 2011 |
Completion of recovered water conveying piping work
Erection of evaporator unit |
Nov 2011 |
Commissioning of Evaporator unit
Starting up of functional ZLD system |
Dec 2011 |
Stabilisation of the functional ZLD system |
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| Project Photos |
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| View of Aeration Tank |
Reactivator Clarifier |
View of Filter Press house |
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| View of UF & RO Skids installed |
View of RO Skid |
View of UF Skid |
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| View of Diesel Generators |
Evaporator building |
Organic scavengers installed |
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| View of OHT-I |
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| Contact details of the CETP: |
Ranipet Tannery Effluent Treatment Co. Ltd
Madras-Krishnagiri Bye Pass Road
VC Mottur, Vannivedu Post
Walajah – 632 513.
Telephone: +91-4172-272 653 / 270
Email: tranitec@rediffmail.com
Contact Person: Mr. R. Ramesh Prasad, Chairman |
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