1. BIOLOGICAL WASTEWATER
TREATMENT
HANOI OPEN UNIVERSITY
Faculty of Biotechnology
Topic:
Teacher: Dr. Thuy
Name: Luong Nguyen
Email: bongtuyettrang.nguyen92@gmail.com
10-01

2. CONTENT
1. Sources wastewater
2. Introduces
3. Processes
4. Applications
5. Conclusion

4. Human
activities
Wastewater
Wastewater
treatment
Environment
Water
treatment
To reuse
- Human health.
To protect: - Environment
- Biodiversity.
standards
Criterias

5. Wastewater sources

6. COMPOSITION
Waste
water
Exessive
nutrients,
P, Nh3
Virus,
pathogen
Heavy metals
Other
substances
Oil
Hazadous
substances

7. 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.

8. nitrosomonas
Pseudomonas micrococcus

9. PROCESSES

10. BASE STEPS:
1
2
5 7
8
3
6

11. 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

12. - 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

13. PRIMARY TREATMENT
-Sewage solids settles to the bottom.
primary slugde
Then sludge are pumped to elsetreatment

14. 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

15. ACTIVATED SLUDGE (SLUDGE TREATMENT)
Include operation:
- gravity thickening
- air flotation
- aerobic and anaerobic digestion
- chemical or heat stabilization

17. TRICKLING FILTRATION

18. ROTATING BIOLOGICAL CONTACTORS (RBC)
Consist of:
-Vertically arranged
- Plastic media on a horizontal
- Rotating shaft
- The shaft slowly rotates at 1 –
1.5rpm

19. TERTIARY
TREATMENT
Remove
suspendens
solids
Remove
nutrients
Effluent polishing
Rapid sand filter
Nitrification
Denitrification
Phosphorus removal
Dissolve CO2,
H2S, NH3

21. 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

22. 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.

23. APPLICATIONS
 Biomass reinforcement
 Solids management
 Biological aids
 Odor control
 Microbial-based solutions safely lower operating costs
 Improve plant efficiency

24. 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

25. REFERENCES
 Lecture Biological wastewater treatment
 Brine Water disposalwww.brinewatersolutions.com
 http://www.igemportal.org/Resim/Wastewater%20Treat
ment%20Technologies_%20A%20general%20rewiev.p
df
 FAO coporate document repository
 Ragsdale and Associates Training Specialists, LLC
 www.water.siemens.com/en/...treatment/tertiary_treat
ment.