Protection of environment in all operations of the company is a core value at NBV. The company takes meticulous care right from the selection of equipment based on eco-friendly technologies, installation of high efficiency pollution control equipment, conservation of energy and natural resources, reducing, reusing and recycling of wastes, etc.
Measures taken to minimize Pollution
The key focus for minimizing air pollution is on low concentration of particulate matter, adherence to emission norms and dust suppression.
Eco-friendly Technology: The power plants use circulating fluidized bed combustion technology to ensure low emission of SOx and NOx. The ferro alloy plants employ low hood smelter technology for control of fugitive emissions.
Electro-static Precipitators: Very high efficiency electro-static precipitators with ample capacity are used to minimize concentration of particulate matter in the flue gases emanating from the boilers.
Filter Bag Houses: Each ferro alloy smelter is connected to a dedicated filter bag house which allows only clean gases containing particulate matter far below prescribed limits to escape into the atmosphere.
Besides these, effective measures are taken for control of fugitive emissions and for dust suppression at various material handling and processing areas.
The key measures adopted for conservation of water and minimizing pollution comprise reducing consumption, recycling and reuse of water and effective effluent treatment.
Reducing Water Consumption: NBV uses dense phase, dry ash handling system at all its power plants to reduce specific consumption of water to just 2.6 litres / kWh of energy generated.
Zero Discharge: Collection of cooling tower blow down, treated DM plant effluents and treated colony waste water in Water Recycling Ponds and reuse of water for slag granulation, bed ash pumping, ash conditioning, dust suppression and development of green belt in the plant and colony helps NBV maintain zero discharge. The total cooling tower blow down water is reclaimed through a Reverse Osmosis Plant.
Effluent Treatment: Effluents from the sugar plant are treated in a bio tower, clarifier and aerators and the resultant water is used for sugarcane cultivation. Effluent from the distillery is treated in a digester and sent to an evaporator where 50% of the effluent is evaporated. The balance is fully utilized for production of bio compost using filter cake from the sugar plant. The bio compost thus produced is used by farmers as manure.
All the solid wastes generated are recycled and used as raw materials.
The entire fly ash generated by NBV's power plants in Andhra Pradesh is utilized for manufacture of cement and bricks.
The slag produced in the manufacture of Ferro alloys is granulated and utilized for production of fly ash bricks and cement concrete rings as partial replacement of sand.
The bed ash from the power plants is used for stowing underground coal mines and filling low lying areas.
The fume collected in filter bag houses is sintered and reused in Ferro alloy smelters.
Apart from the above measures, development and maintenance of green belt beyond the statutory requirements is a regular practice at all the manufacturing facilities of the company.
The Environmental Management System followed by NBV is certified as per ISO 14001:2004