This publication provides introductory technical guidance for civil engineers, environmental engineers, construction managers, treatment plant operators and other professional engineers interested in treatment options for hazardous liquid waste streams. Here is what is discussed: 1. DEFINITIONS, 2. AIR STRIPPING, 3. BIOLOGICAL TREATMENT, 4. CARBON ADSORPTION, 5. CHEMICAL OXIDATION, 6. RESIN ADSORPTION 7. CHEMICAL REDUCTION, 8. PRECIPITATION, 9. FLOCCULATION AND SEDIMENTATION, 10. NEUTRALIZATION, 11. OIL-WATER SEPARATION, 12. DISSOLVED AIR FLOTATION, 13. REVERSE OSMOSIS, 14. SOLIDIFICATION/STABILIZATION, 15. ULTRAFILTRATION