11.07.2015 Views

MINUTES OF2ND RECONSTITUTED EXPERT APPRAISAL ...

MINUTES OF2ND RECONSTITUTED EXPERT APPRAISAL ...

MINUTES OF2ND RECONSTITUTED EXPERT APPRAISAL ...

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mixing Manganese Ore, metallurgical Coke, Dolomite, Quartz etc. in requisite proportionto production of Fe-Mn or Si-Mn. Fe-Mn slag & quartz are added as raw material forsilico-manganese production. The blended raw materials are charged to the furnace withthe help of conveyors and charging chutes. In the furnace, carbon electrodes arepartially submerged in the charge, operated by hydraulic cylinder. The liquid metal alloyis tapped at regular intervals. Tap holes are provided at the bottom of the furnace fortaping both molten alloys and slag. The tap hole is opened by oxygen lancing pipe andafter tapping is completed, it is closed by clay plugs. Slag is collected in the slag dishand it is shifted with the help of EOT. After the product is cooled, it is off loaded from thecasting bed for breaking, cleaning and packing.The PM from SAF will be controlled by the installation of bag house with ID fanand stack. Fully covered conveyor belt with dry fog system will be used for conveying theraw material dust. Water sprinklers will be used for dust suppression. Base line data ofambient air quality monitored at eight locations indicates that concentrations of PM 10 ,PM 2.5 , SO 2 and NO x are varying from 32.1 µg/m 3 to 50.1 µg/m 3 , 10.2 µg/m 3 to 19.6µg/m 3 , 7.2 µg/m 3 to 10.9 µg/m 3 and 3.4 µg/m 3 to 9.7 µg/m 3 respectively. AAQ modellingstudy indicates that the maximum incremental GLCs after the proposed project would be14.09 µg/m 3 , 5.58 µg/m 3 and 1.18 µg/m 3 with respect to PM 10 , SO 2 and NO x respectively.The resultant concentrations are within the NAAQS.Total make up water requirement will be 30 m 3 /d and will be sourced from ADDAsupply. Rain water harvesting is also proposed. The wastewater generated will becollected and after treatment in units like settling ponds & clarifier, will be used for dustsuppression and greenbelt development. Domestic effluent will be treated in septic tankfollowed by soak pit. No effluent will be discharged out side premises and zerodischarge norms will be adopted. The Fe-Mn Slag will be fully utilized in Si-Mnproduction and Si-Mn slag will be sold to glass manufacturers. The fines and dust fromraw material handling will be used in the furnace. The used batteries/used oil/lubricantsare sold to hazardous waste authorized dealers.The Committee noted that no public hearing / consultation is required due toproject being located in notified industrial estate as per stage Section 7 (i), III Stage (3),Para (i)(b) of EIA Notification 2006. Environmental clearance was accorded to JamuriaIndustrial Estate on 6.11.2006.After detailed deliberations, the Committee found the EIA/EMP report adequateand suggested to stipulate following specific conditions along with other environmentalconditions while considering for accord of environmental clearance:1. No charcoal shall be used as fuel. Pet coke shall be used as fuel instead ofcharcoal from unknown sources.2. Continuous monitoring facilities for the process stacks and sufficient air pollutioncontrol equipments viz. fume extraction system with bag filters, ID fan and stackof adequate height to submerged arc furnace shall be provided to controlemissions below 50 mg/Nm 3 .3. The National Ambient Air Quality Standards issued by the Ministry vide G.S.R.No. 826(E) dated 16 th November, 2009 shall be followed.

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