4. Installation of lime-kiln for recalcination of lime sludge by March 2007

Our Bhadrachalam unit, where this norm is applicable, has a lime-kiln in operation for more than seven years.

5. Odour Control by burning reduced sulphur emissions in the boiler/lime-kiln by 2007

Pulp manufacturing conventionally produces non-condensable gases (NCG) containing Total Reduced Sulfur (TRS), which include hydrogen sulfide, methyl mercaptan, dimethyl sulfide and di-methyl disulfide and can be a source of odour.

In the Bhadrachalam mill, the newly installed Super-batch digesters have considerably reduced generation and release of a number of these gases. In addition a number of Low Volume High Concentration gases present in the plant areas are collected through an extensive piping system & led to lime-kilns for incineration.

6. Effluent Colour removal

The Indian Paper Manufacturers Association has engaged the Central Pulp & Paper Research Institute to suggest measures for colour removal from effluents.

Bhadrachalam unit, however, has adopted ‘Moving Bed Biofilm Reactor’ technology for effluent treatment, which has led to significant reduction in the effluent colour.