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New technology for effluent treatment plants

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State-of-the art: Minister for Environment T.P.M. Mohideen Khan, second from right, commissioning a new system at the Common Effluent Treatment Plant in Dindigul on Saturday.
State-of-the art: Minister for Environment T.P.M. Mohideen Khan, second from right, commissioning a new system at the Common Effluent Treatment Plant in Dindigul on Saturday.

Staff Reporter

Modern system in Dindigul commissioned

900 of 2,000 tanneries in India are in Tamil Nadu

14 of 18 CETPs in the country also

DINDIGUL: Reverse osmosis and residue management system would be implemented in 10 common effluent treatment plants in the State, including the one at Dindigul. Proposals to this effect at an estimated cost of Rs.121 crore had been sent to the Central Government for approval, said T.P.M. Mohideen Khan, Minister for Environment.

He was speaking at the inauguration of bio-energy generation and sulphur recovery system at the Common Effluent Treatment Plant (CETP) here on Saturday. To set up such a facility, the Centre would offer 60 per cent of project cost as subsidy. Tanneries in Dindigul alone discharged 2,533 kilo litres of effluents in a day, he added.

Revenue Minister I. Periasamy said that introduction of advanced technology would protect the environment and ensure survival of the leather industry.

Collector R. Vasuki said Rs.1 crore had been disbursed as compensation to people affected in the leather belt.

First of its kind

Central Leather Research Institute’s Technical Advisor S. Rajamani said that the new facility, first of its kind in the world, was installed at a cost of Rs. 4.90 crore. First, the effluent was fed into up-flow Anaerobic Sludge Blanket System with retention time of 24 hours, where effluent is anaerobically digested and cut pollution load by 60 per cent and covert degradable waste in to bio gas.

About 1,500 to 2,000 units of power per day worth Rs.8,000 would be produced using 1,500 metre cube biogas generated from this facility to meet 60 per cent of electricity required for the CETP. For the first time, sulphur was recovered in its elemental form from waste water. It could be used for leather tanning. The latest technology would cut down retention time to 24 hours from 15 days.

Mechanical dewatering of sludge using chamber filter press would not only reduce total volume of sludge but also avoid manual handling. Equalisation system with submergible ejectors provided better homogenation of effluents with 60 per cent less energy. The new system would reduce total dissolved solids levels and make bio-gas fit for power generation. The closed anaerobic lagoon would control methane emission, odour and minimise sludge generation.

Of the 2,000 tanneries in the country, 900 are in Tamil Nadu of which 90 per cent are small scale units functioning in clusters. And 14 of 18 CETPs in the country are in Tamil Nadu.

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