2. Aerobic and anaerobic biological wastewater treatment processes: Case studies
Presenting by: Ghasem D. Najafpour
Coworkers: Zeinab Bakhshi
Esmaeel Kariminezhad, Roya Pishgar
Babol Noshirvani University of Technology
February 2011

3. Environmental pollution Harmful to human & plants
Threat to aquatic life
Major concern of mankind

4. Wastewater treatment processes
Biological
Anaerobic
Aerobic
Physical
Chemical

5. Aerobic Biological Processes
Organic matter serves as electron donor
Oxygen serves as electron acceptor
Remove colloidal and suspended solids
Remove organic compounds to prevent excessive DO depletion
Aerobic Biological Processes

6. Aerobic suspended growth processes
Microorganisms are preserved in liquid suspension by suitable mixing methods
Adequate dissolved oxygen concentration is required
Aerobic suspended growth processes
One of the most important suspended growth technologies is activated sludge process
Used for biological treatment of municipal and industrial wastewaters

7. Aerobic attached growth processes
Less energy consumption
Simpler operation
Better recovery after shock toxic loads
Less equipment maintenance
Better sludge thickening properties
No bulking problems

8. Anaerobic Biological Processes
Biogas
Residual organic matters
Microbial biomass
Organic matter

9. Advantages: Methane production Less Energy required
Less biological sludge produced
Low nutrients required
Methane production
Small reactor volume

10. Biological Processes performed in this study
Aerobic Biological Processes
Attached Growth
RBC
Suspended Growth
Activated sludge

11. Rotating Biological Contactor (RBC)
Wastewater characteristic
Dairy Wastewater
Gela, Amol, iran
Reactor Configuration
Working Volume
65.6 Liter
Length
75 cm
Width
35 cm
Depth
30 cm
Total Discs number 48
Disc Diameter
16 cm

12. Reactor Performance
Figure 1: COD removal efficiency with respect to OLR with and without recirculation

13. Activated Sludge Wastewater characteristic
Amol industrial park wastewater
Mazandaran, Iran
Figure 2: Schematic Figure of Amol Industrial Wastewater treatment plant

14. Activated Sludge

15. Figure 3: COD removal and effluent COD with respect to HRT
Figure 4: Effect of recycle ratio on COD removal, SVI and F/M

16. Figure 5: COD removal with respect to HRT
Wastewater characteristic
Yasreb municipal wastewater plant
Ghaemshahr, Iran
Figure 5: COD removal with respect to HRT
Figure 6: Effect of recycle ratio on COD removal, SVI and F/M

17. Biological Processes performed in this study
Anaerobic Biological Processes
Attached Growth
UASFF

18. UASFF Bioreactor Reactor Configuration Internal Diameter 2.76 cm
Height
160 cm
Total Volume
960 ml
Support material
Seashell
Void
85%

19. Dairy wastewater Characteristic
Value
COD (mg/l)
Lactose (g/l)
50-60
TS (g/l)
55-65
VS (g/l) 49
Proteins (g/l)
2.2
Phosphate (g/l)
0.6
Ca (g/l)
0.02 pH

20. Reactor operation Acclimation period 26 days COD concentration
mg/l
Duration of each period
8 days
Temperature
37 °C
HRT
36 & 48 h

21. Figure 7: COD removal efficiency with respect to OLR for HRTs 36 and 48 h

22. UASFF Bioreactor Main characteristics of pulp and paper wastewater
Wastewater characteristic
Pulp and paper wastewater
Sari, Iran
Main characteristics of pulp and paper wastewater
Value
Flow (m3/h)
984 pH
7-8
Temp (˚C)
37-55
SS (mg/l)
900
COD (mg/l)
2800
BOD5 (mg/l)
1140
Resin acids (mg/l)
140
Sulfur (mg/l)
150
UASFF Bioreactor

23. Figure 8: Schematic diagram of UASFF bioreactor

24. Figure 9: COD removal with respect to HRT at temperature 37 and 55 °C

25. Conclusions:
Aerobic and anaerobic processes are capable of treating industrial and municipal wastewaters
UASFF had a considerable performance on treatment of dairy and pulp and paper wastewaters
Pulp and paper removal efficiency (HRT 24 h):
37 ˚C %
55 ˚C %
Dairy Wastewater removal efficiency:
HRT 36 h %
HRT 48 h %

26. Treatment of Dairy wastewater by RBC:
Improvement of 10% in COD removal efficiency by changing the operation mode to with recirculation
Activated sludge was able to treat municipal and industrial wastewaters significantly.
Industrial wastewater:
Recycle ratio: 0.85
COD removal Efficiency: 95%
SVI: 83
F/M: 1.1
Municipal wastewater:
Recycle ratio: 0.2
COD removal efficiency: 85%
SVI: 100
F/M:0.3

27. Biotechnology Research Laboratory,
Babol Noshirvani University of Technology

28. Anaerobic baffled reactor Upflow anaerobic packed bed reactor
Wastewater treatment Group
Anaerobic baffled reactor
Upflow anaerobic packed bed reactor
Group Members: Nafise Moosavi, Zeinab Bakhshi

29. Anaerobic Fluidized bed reactor
Wastewater treatment Group
Anaerobic CSTR
Anaerobic Fluidized bed reactor
Group Members: Roya Pishgar, Tahere Taghizade

30. Adsorption & Chitosan production Group
Enzyme Group
Group Members:
Zahra Vaseghi, Maryam Hosseinpour, Samane Mohseni
Adsorption & Chitosan production Group
Group Members: Marjan Khorrami, Hamide Radnia

31. Microbial Fuel Cell Group
Group Members: Mostafa Rahimnezhad, Fahime Haghparast, Tahere Jafari

32. Thank you for your attention