11 PICKLING AND COATING SYSTEMS, WASTE ACID REGENERATION OF HYDROCHLORIC, SULFURIC AND MIXED ACIDS, AIR POLLUTION CONTROL SYSTEM WHEREBY POLLUTANTS ARE PROCESSED INTO NON-POLLUTANTS THROUGH THE USE OF CHEMICALS AND/OR WATER, NEUTRALIZATION OF LIQUIDS USING CHEMICALS, LIME AND/OR EXCHANGE OF IONS, AND PLANTS IN CONNECTION WITH STEEL AND OTHER METALS INCLUDING LINES AND PLANTS FOR ROD, WIRE, PLATE, SHEET AND PIPE, COMPONENTS, SHAPES AND MANUFACTURED STEEL GOODS