ABSTRACT
Electroplating and other metal nishing operations discharge their spent process water to either waterways or publicly owned treatment works (POTWs) and they comprise more individual wastewater discharges than any other industrial category. The pollutants contained in these discharges are potentially toxic; therefore, to comply with the Clean Water Act, the water must be treated
Abstract .......................................................................................................................................... 185 6.1 Introduction .......................................................................................................................... 186 6.2 Process Theory ..................................................................................................................... 190
6.2.1 SSP Process Chemistry ............................................................................................ 192 6.2.2 ISP Process Chemistry ............................................................................................. 193
6.3 Soluble Sulde Precipitation ................................................................................................. 195 6.3.1 Pilot Plant Evaluation ............................................................................................... 195
6.3.1.1 Test Description ......................................................................................... 195 6.3.1.2 Test Results ................................................................................................ 197
6.3.2 SSP System Description and Performance ...............................................................200 6.3.3 SSP Polishing Treatment System ..............................................................................203 6.3.4 Hydroxide System Modications for SSP ................................................................204 6.3.5 SSP Cost Estimating .................................................................................................206
