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BIOLOGICAL WASTEWATER
TREATMENT
HANOI OPEN UNIVERSITY
Faculty of Biotechnology
Topic:
Teacher: Dr. Thuy
Name: Luong Nguyen
Email: [email protected]
10-01
Human
activities Wastewater
Wastewater
treatmentEnvironment
Water
treatment
To reuse
- Human health.
To protect: - Environment
- Biodiversity.
standards
Criterias
COMPOSITION
Waste
water
Exessive
nutrients,
P, Nh3
Virus,
pathogen
Heavy metals
Other
substances
Oil
Hazadous
substances
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.
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
- 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
PRIMARY TREATMENT
-Sewage solids settles to the bottom.
primary slugde
Then sludge are pumped to elsetreatment
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
ACTIVATED SLUDGE (SLUDGE TREATMENT)
Include operation:
- gravity thickening
- air flotation
- aerobic and anaerobic digestion
- chemical or heat stabilization
ROTATING BIOLOGICAL CONTACTORS (RBC)
Consist of:
-Vertically arranged
- Plastic media on a horizontal
- Rotating shaft
- The shaft slowly rotates at 1 –
1.5rpm
TERTIARY
TREATMENT
Remove
suspendens
solids
Remove
nutrients
Effluent polishing
Rapid sand filter
Nitrification
Denitrification
Phosphorus removal
Dissolve CO2,
H2S, NH3
Process Goal Bacteria Condition
Nitrification Oxidation
NH3NO2NO3
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
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.
APPLICATIONS
Biomass reinforcement
Solids management
Biological aids
Odor control
Microbial-based solutions safely lower operating costs
Improve plant efficiency
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
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.