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Biological wastewater treatment. MB.Luong Nguyen Thanh
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Biological wastewater treatment. MB.Luong Nguyen Thanh


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  • 1. BIOLOGICAL WASTEWATER TREATMENT HANOI OPEN UNIVERSITY Faculty of Biotechnology Topic: Teacher: Dr. Thuy Name: Luong Nguyen Email: 10-01
  • 2. CONTENT 1. Sources wastewater 2. Introduces 3. Processes 4. Applications 5. Conclusion
  • 3. Human activities Wastewater Wastewater treatment Environment Water treatment To reuse - Human health. To protect: - Environment - Biodiversity. standards Criterias
  • 4. Wastewater sources
  • 5. COMPOSITION Waste water Exessive nutrients, P, Nh3 Virus, pathogen Heavy metals Other substances Oil Hazadous substances
  • 6. WHAT IS BIOLOGICAL TREATMENT? - Use microorganisms to remove contaminant. - Knowing the compositions  choose right system to treat and suitable for requirements. Why use Bacteria? - Bacteria’s remarkable ability. - Take energy from the oxidation of organics for metabolism and building cells - Favorable conditions for growth This metabolic activity can remove contaminants.
  • 7. nitrosomonas Pseudomonas micrococcus
  • 9. BASE STEPS: 1 2 5 7 8 3 6
  • 10. TYPICAL WASTE TREATMENT 6.7.8 4.5 1. Tertiary treatment Secondary treatment 2.3 Primary treatment Pretreatment Remove any residual contaminants Remove suspended solids, organic, soluble materials. Separate oils,floating solidsp H. Separate coarse and material
  • 11. - To reduce and eliminate contaminants - To protect the sewer lines Common Wastewater Pretreatment Processes Process Services Coarse Solid Screening Bar racks, Screens, Rotary disks, Centrifugal Free Oil Separation Gravity separators. Air flotation devices Equalization In-line, off-line basins
  • 12. PRIMARY TREATMENT -Sewage solids settles to the bottom. primary slugde Then sludge are pumped to elsetreatment
  • 13. SECONDARY TREATMENT (THE MOST IMPORTANT PART)  Remove up to 90% of the organic matter and oil.  Biological treatment process during secondary treatment  Biological clarification Biochemical EnvironmentsThree Major Ones * Aerobic * Anaerobic * Anoxic
  • 14. ACTIVATED SLUDGE (SLUDGE TREATMENT) Include operation: - gravity thickening - air flotation - aerobic and anaerobic digestion - chemical or heat stabilization
  • 16. ROTATING BIOLOGICAL CONTACTORS (RBC) Consist of: -Vertically arranged - Plastic media on a horizontal - Rotating shaft - The shaft slowly rotates at 1 – 1.5rpm
  • 17. TERTIARY TREATMENT Remove suspendens solids Remove nutrients Effluent polishing Rapid sand filter Nitrification Denitrification Phosphorus removal Dissolve CO2, H2S, NH3
  • 18. Process Goal Bacteria Condition Nitrification Oxidation NH3NO2NO3 Nitrobacter, Nitrosomonas - Occur after most of the BOD has been removed - Aerobic Denitrification NO3  N2 Denitrifying bacteria - Can occur in most activated sludge processes or oxidation ditch processes. - Anoxic REMOVAL NUTRIENT
  • 19. Pathogen Disease Caused Bacteria: Anthrax anthrax Escherichia coli E. coli infection Myobacterium tuberculosis tuberculosis Salmonella salmonellosis, paratyphoid Vibrio cholerae cholera Viruses: Hepatitis Virus Hepatitis A Polio Virus polio Parasites: Cryptosporidium cryptosporidiosis Giardia lamblia giardiasis Use sodium hypochlorite. Ultraviolet light and ozone.
  • 20. APPLICATIONS  Biomass reinforcement  Solids management  Biological aids  Odor control  Microbial-based solutions safely lower operating costs  Improve plant efficiency
  • 21. CONCLUSION 1. Use biological treatment take advantage bacteria. 2. Treat a wide variety of contaminant in wastewater 3. Effluent and sludge possess high fertilizing value. 4. It can be highly lucrative
  • 22. REFERENCES  Lecture Biological wastewater treatment  Brine Water  ment%20Technologies_%20A%20general%20rewiev.p df  FAO coporate document repository  Ragsdale and Associates Training Specialists, LLC  ment.