CHAPT 3 HYDROXIDE PRECIPITATION Introduction Advantages and Disadvantages of Hydroxide Precipitation Hydroxide Precipitation Using Lime Hydroxide Precipitation Using Caustic Soda Hydroxide Precipitation Using Magnesium Oxide Process Performance CHAPT 4 SULFIDE PRECIPITATION Introduction Advantages and Disadvantages of Sulfide Precipitation Soluble Sulfide Precipitation (SSP) Insoluble Sulfide Precipitation Calcium Sulfide Precipitation CHAPT 5 CARBONATE PRECIPITATION Introduction Advantages and Disadvantages of Carbonate Precipitation Carbonate Precipitation Using Calcium Carbonate Carbonate Precipitation Using Sodium Carbonate CHAPT 6 OTHER PRECIPITATION Introduction Xanthate Precipitation Combined Precipitation

CHAPT 7 COAGULATION AND FLOCCULATION Introduction Theory and Discussion CHAPT 8 COAGULANTS, POLYELECTROLYTES, AND COAGULANT AIDS Introduction Inorganic Coagulants Polyelectrolytes Polyelectrolytes vs. Inorganic Coagulants Coagulant Aids Chapt 9 MIXING—GENERAL DISCUSSION AND THEORY Introduction Rapid Mixing Rapid Mixing Vessel Considerations Flucculation Mixing/Agitation Chapt 10 TREATABILITY TESTING Introduction Determination of Optimum pH Level Determination of Coagulant and Coagulant Aid Dosage Rates Determination of Settling Rates Determination of Sludge Characteristics Oxidation Considerations (Iron and Manganese Removal)

Chapt 11 PRE-TREATMENT REQUIREMENTS Introduction Flow Equalization Oil and Grease Removal Chromium Reduction Cyanide Destruction Complexing/Chelating Agent Removal Chapt 12 EQUIPMENT REQUIREMENTS Introduction Equalization Tank/System pH Control System Tank/Reactors Rapid Mixers Flocculators/Agitators Chemical Feed Equipment Sludge Dewatering Equipment Miscellaneous Equipment Chapt 13 P/C/F SYSTEM COSTS, STARTUP, AND OPERATIONS Introduction System Costs Pre-Startup Checkouts Pre-Startup Testing Startup Field Training Shutdown Operation and Maintenance Manual Updates Operation