BIOLOGICAL WASTEWATER

TREATMENT

HANOI OPEN UNIVERSITY

Faculty of Biotechnology

Topic:

Teacher: Dr. Thuy

Name: Luong Nguyen

Email: bongtuyettrang.nguyen92@gmail.com

10-01

CONTENT

1. Sources wastewater

2. Introduces

3. Processes

4. Applications

5. Conclusion

Human

activities Wastewater

Wastewater

treatmentEnvironment

Water

treatment

To reuse

- Human health.

To protect: - Environment

- Biodiversity.

standards

Criterias

Wastewater sources

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.

nitrosomonas

Pseudomonasmicrococcus

PROCESSES

BASE STEPS:

1

2

5 7

8

3

6

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

TRICKLING FILTRATION

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.