Review of Environmental Engineering II. Water quality management Water pollutants sources – Point...

Review of Environmental Engineering II

Water quality management

• Water pollutants sources– Point sources– Nonpoint sources

• Water pollutants– Oxygen demanding material– Nutrients– Pathogenic organisms– Suspended solids– Salts– Toxic metals– Heat– ….

Water quality management

• Water quality management in rivers– Effect of pollution on river – Effect of oxygen-demanding waste on rivers• Biochemical Oxygen Demand （ BOD）• COD

– DO sag curve• Oxygen deficit• DO sag equation

– Management strategy

Water treatment

• Importance of water• Characteristics of water – Physical – Chemical – Microbiological – Radiological

• Water standard• Water classification– Ground water– Surface water

Water treatment• Treatment systems– Water treatment facilities– Treatment process• Coagulation• Softening

– Lime-Soda Softening– Ion-exchange softening

• Mixing and flocculation• Flocculation• Sedimentation• Filtration• Disinfection

– Other treatment process of drinking water

Wastewater treatment• Perspective• Characteristic of domestic wastewater• On-site disposal systems– Septic system

• Municipal wastewater treatment system– Pretreatment– Primary treatment– Secondary treatment– Advanced wastewater treatment

• Sludge treatment