In annual report ,on page no. 76,point 5 of principal 2 explains everything.
",,, Our sites are committed to ‘Zero Waste to Landfill’ and thus, we strive to recycle and reuse our waste through various initiatives such as co-processing, recyclable pallets for material transportation. Non-hazardous waste such as packaging material and scrap are recycled and reused. ..." Annual Report 2016-17 p. 74