Spray Dryer for Evaporation of Effluent of Acid Black 194

Looking to the present status for compliance of Common Effluent Treatment Plans (CETPs), no new permissions for accepting effluent to CETP are permitted as Central Pollution Control Board, a statutory Body has imposed direction under section 18(1) B of the Water Act 1974.This retards the growth of industries which have potential to expand. Keeping this restriction in view, If alternative of CETP is explored, a situation may come up in favor to the industry which will not only comply the prevailing imposition of restriction under 18(1) b of the Water Act 1974 but also will allow industrial unit to grow. Alternative is not to discharge waste water to the CETP, instead it is to be evaporated keeping the air emission within National Ambient Air Quality Standards. As discussed in this paper, cost of evaporation of waste water bears higher cost than conventional treatment, products having good profit margin can go for pursuing alternative of spray drying of effluent. A case study of spray drying of treated waste water of Acid Black 194 is considered where the spray dryer is already existing for drying the products.