Indian Aluminium Company Limited, Alupuram Smelter Eloor.

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110 The Effluent treatment system comprises of Primary & Secondary treatments . Liquid effluent from the plants is collected in a sump in the premises of the factory and taken to the raw effluent collection tank of ETP for equalization .The effluent is then pumped to the mixing channel where it is treated with chemicals such as lime, alum to coagulate the dissolved & suspended solids. This is allowed to settle in a primary settling tank and the overflow is subjected to secondary treatment of activated sludge process. After secondary treatment the effluent is allowed to settle in the secondary settling tank. The overflow is discharged through a V-notch chamber into periyar river through an open channel. The sludge generated is pumped to the sludge drying bed and then it is stored in temporary TSDF . Findings: 1. The factory is producing Rubber accelerators , liquid type antioxidants, peptiser , Form Stabilizer, Anti tack agents and the production rate specified in the consent order is Mercure TMT 40 t/month ZMBT/Mertard 25 ,, Mertiser 15 ,, Mercure TBBS 5 ,, Mernox SP 5 ,, SDMDC/PDMDC 30 ,, 2. Obtained consent under the Water(Prevention and Control of Pollution)Act 1974 for discharging 10,000 litre /day effluent into Periyar river. 3. Effluent Treatment Plant constructed in the premises of Merchem Limited, Edayar is used for treating the effluent generated from both the factories. 4. The effluent generated in the factory is collected in an effluent sump and taken to the Effluent Treatment Plant of Merchem Limited., Edayar in the adjacent plot by gravity flow. The treatment facility provided at Merchem limited comprises of Chemical treatment followed by, Activated Sludge Premises . 5. The effluent treatment plant was not working at the time of inspection on 29-11-04. There was no overflow from the secondary settling tank. But there was considerable discharge from the outlet from the overflow channel of the secondary settling tank. Effluent samples were collected for analysis. The quality of supernatant effluent sample collected from the secondary settling tank and effluent in the overflow channel indicate that the effluent quality is varying to a great extent, instead of being similar. The overflow sample discharged through outlet is well within the limits whereas the effluent in the secondary settling tank is highly contaminated as noted below. No Determinants Unit Effluent from Secondary Settling tank. 1 pH 5.9 7.0 2 Suspended Solids mg/l 647 15 3 TDS (inorganic) ,, 6900 382 4 Zinc ,, 1.60 ND 5 Chlorides ,, 4000 68 Effluent from overflow channel of Secondary Settling tank
111 6 Sulphates ,, 800 25 7 Phenolic Compounds ,, 30 0.2 8 Oil and grease ,, ND ND 6. The result reveal that bypass line is provided for admitting fresh water to the outlet for diluting the effluent and achieving the prescribed quality. 7. On seeing the inspection team the effluent treatment plant was started by pumping raw effluent from the collection tank to the mixing channel for chemical treatment. 8. According to the company about 3kg/day sludge is generated from the effluent treatment plant which is dewatered in the sludge drying beds and disposed in the recently constructed temporary storage facility for hazardous wastes. 9. Both the units namely M/s Merchem Limited, Edayar and M/s Merchem (India ) Pvt. Ltd have not obtained authorization under the Hazardous Waste(Management and Handling)Rules 1989 for the disposal of hazardous wastes. 10. No Hazardous waste was seen stored in the temporary storage facility during the inspection on 29-11-04. The company authority informed that solid wastes and sludge generated so far from the effluent treatment plant ,since its inception were land disposed after drying in sludge drying beds. 11. During the subsequent inspection on 08/06/05 hazardous waste disposal in temporary facility is seen started. 12. The report of analysis of effluent collected on 29-11-04 and 08/06/05 show that the raw effluent contains high BOD,COD,TDS,Chlorides, Sulphates and high COD/BOD ratio. Date of Sampling 29-11-04 No Determinants Unit Raw Effluent Tank Raw Effluent ZDC tank Primary Settling Tank Effluent from secondary Settling tank 1 pH 7.4 8.6 6.5 5.9 7.0 2 Suspended mg/l 30 788 18 647 15 Solids 3 TDS ,, 16632 9542 8748 6900 382 (inorganic) 4 Zinc ,, 0.35 0.1 3.5 1.6 ND 5 Chlorides ,, 11400 3700 6000 4000 68 6 Sulphates ,, 280 2000 400 800 25 7 Phenolic Compounds 8 Oil and grease ,, 0.24 31 10 30 0.2 ,, ND ND ND ND ND Overflow channel of Secondary Settling tank
Page 1 and 2: 77 INDIAN ALUMINIUM COMPANY LIMITED
Page 3 and 4: 79 8. The industrial plant was not
Page 5 and 6: 81 5. Industry has obtained consent
Page 7 and 8: 83 Heat Exchangers. The gas then go
Page 9 and 10: 85 1. Concentration and crystalliza
Page 11 and 12: 87 Petro chemical Division is conce
Page 13 and 14: 89 7. The scrubber stack for IVth a
Page 15: 91 the faulty nature of manual anal
Page 18 and 19: 94 Source : FACT - UD Date of sampl
Page 20 and 21: 96 FACT- PETROCHEMICAL DIVISION Nam
Page 22 and 23: 98 scrubbing with ammonia water whe
Page 24 and 25: 100 5. Delay ponds shall be provide
Page 26 and 27: 102 Products : Rare Earths Chloride
Page 28 and 29: 104 recovered. Ammonium di uranate
Page 30 and 31: 106 M/S KEMO GRAVURES , EDAYAR Name
Page 32 and 33: 108 Raw materials : Name Quantity (
Page 36 and 37: 112 Date of Sampling 08/06/05. Sl.
Page 38 and 39: 114 Waste: Sources of liquid waste
Page 40 and 41: 116 Date of Sampling 29-11-04 N o D
Page 42 and 43: 118 Raw Materials: Name of material
Page 44 and 45: 120 Findings 1. The factory situate
Page 46 and 47: 122 Consented Parameters and limits
Page 48: 124 Source : Sud Chemie India Pvt.

Indian Aluminium Company Limited, Alupuram Smelter Eloor.

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