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TAMIL NADU POLLUTION CONTROL BOARD

 

WATER CONSERVATION

 

As a water conservation measure, three major industries in Manali and Basin Bridge area are utilising about 25 MLD (million liters per day) of city sewage in their plants after tertiary treatment for cooling purposes. The dyeing units in the State including units at Tiruppur have provided reverse osmosis plants for recovering the process water from the effluent. The recovered water is reused in the process. In sugar industries, water condensate from evaporators is reused. As a condition for issue of consent, industries have been instructed to provide rainwater harvesting arrangements. All the industries have set up rain water harvesting systems. The roof top rainwater harvesting system has also been provided in the offices of the Tamil adu Pollution Control Board.

 

CLEANER TECHNOLOGIES

 

The TNPCB is involved in promoting a holistic approach of environment protection by cleaner technology options more than mere end-of-pipe treatment. With active support and encouragement from the Board, the industrial units in Tamilnadu have switched over to cleaner technologies such as adoption of membrane cell instead of mercury cell in caustic soda manufacturing, adoption of dry process instead of wet process to reduce air pollution in cement factories, utilization of 25 to 30% of fly ash in PPC cement manufacturing, adoption of double conversion and double absorption technology in sulphuric acid manufacturing, gas carburizing instead of cyanide salt in heat treatment and cyanide free electroplating. Pulp and paper industries are encouraged to go in for elemental chlorine free bleaching to reduce the formation of organo-chlorides including dioxins. Industries consuming ozone-depleting substances are systematically changing to environment friendly compounds very recently Tamil Nadu Pollution Control Board has initiated for demonstrating best available technologies for MSME through Technology Demonstration Centre established at IIT Madras with the financial support of TNPCB at a cost of Rs. 5 crores.

 

WASTE MINIMISATION

 

With the adoption of cleaner technologies there has been progress in waste recovery and waste minimization. Examples include recovery of materials such as chrome from tannery effluent and ammonia from fertilizers. Distilleries have been insisted to provide zero discharge system and many distilleries have gone for biocomposting of their effluents with press mud of sugar factories for achieving zero discharge of trade effluent and some distilleries have established concentration cum incineration system to dispose spent wash effluent and achieved zero discharge of trade effluent.

 

ENERGY CONSERVATION

 

As a measure for fuel conservation and recovery, all the distilleries are recovering methane gas from their spent wash through anaerobic digestion. Major sugar factories have installed co-generation power plants. The sago units recover methane gas from their trade effluent through anaerobic digestion. In activated carbon process, the waste heat is recovered and used at boiler section. Other industrial units are encouraged to use less energy and it is being audited through the environmental statements of the unit

 

GREEN COVER PROGRAMME

 

As a measure of pollution check, industries have been directed to develop 25% of the land area as green belt with trees having a thick canopy cover. Accordingly, industries have taken action to plant adequate number of trees in and around the industrial premises

   

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