53 Promoting better air quality through lower VOC emissions at Unit IV The Challenge: The ZLD facility at Unit IV is equipped with tanks storage and the collection of High Total Dissolved Solids (HTDS) effluent. The open condition of the tanks resulted in the release of a high concentration of VOCs into the atmosphere. Actions Taken: To improve the quality of air, Fume Hood systems, that limit the release of VOCs were installed on all three tanks. The Fume Hoods act as a local ventilation device that limit exposure of hazardous and toxic fumes to the operators as well as the release of these fumes into the environment. Post installation monitoring shows that the concentration of fumes escaping into the atmosphere has reduced by 98%. Green belt at Unit IV Environmental Initiatives at Unit IV 35% 23% 4000 100% Recycled water (RO permeate) for utilities ZLDS operational cost reduction Saplings planted Zero waste to landfill achieved Co-processing Location VOC before installation of fume hood (ppm) VOC after installation of fumehood (ppm) VOC reduction (%) HTDS collection tank 1 (103 KL) 249.2 1.85 99% HTDS collection tank 2 (103 KL) 110.2 1.2 98% HTDS Equalization tank (63 KL) 75.2 1.4 98%
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