Evaluation of the ambient air quality analysis of HCL, H2S and NH3 from enhanced evaporation spray system ponds on the Highveld of South Africa

Abstract

Enhanced evaporation spray system ponds are an inexpensive method for waste water storage and removal. The spray system involves the spraying of the waste water via spray pipes that hang over the waters surface into the ambient environment. However, since such waste water storage and removal is used by large industry and specifically the metal refining industry the water contains chemicals that when are evaporated cause some disturbances in the surrounding ambient atmosphere. This document focuses specifically on three gases, HCL (hydrochloric acid mist), H2S (hydrogen sulphide) and NH3 (ammonia). These three gases that evaporate from the waste water, are the major gases of concern with regards to EESS ponds in the platinum refining industry. The corrosive effects are visible on surrounding steel structures as well as a distinctive unpleasant odour. This study also highlights the emphasis on proper ambient air quality analysis as well as safety measures for workers in the vicinity of the evaporation ponds.