The document describes a study on treating landfill leachate using a two-stage anaerobic-aerobic system. The system uses an Upflow Anaerobic Sludge Blanket (UASB) reactor for the anaerobic stage followed by a Sequencing Batch Reactor (SBR) for the aerobic stage. The objectives are to determine the performance of the combined system and enhance nitrogen removal. Key parameters like COD, BOD, NH4-N, and NO3-N are monitored in both reactors. Preliminary results show the total system achieves high removals of 91.72% for BOD and 46.44% for COD. Nitrogen removal is 34.75%

1. LANDFILL LEACHATE
TREATMENT BY USING
TWO STAGE
ANAEROBIC - AEROBIC
SYSTEM
MEMBERS :
PREMARATHNE H.P.A.S. (E/10/261)
MALALAGAMA T.P.(E/10/415)
SUPERVISOR : Dr. K.B.S.N. JINADASA

2. Key words
1. Landfill
2. Leachate
3. Anaerobic treatment
• UASB
4. Aerobic treatment
• SBR

3. 1.Landfill
Municipal wastes
• Solid waste Industrial wastes
Biomedical wastes
Landfills
Problem???
Leachate

4. 2.Leachate
• Is the liquid that leaches from a landfill
• The generation of leachate is caused principally by
precipitation, percolating through waste deposited
in a landfill.
• Varies widely in composition according to age
( Sha Liu,2013)

5. • Landfill leachate classification vs. age,
Parameter Young Intermediate Old
Age (years) <5 5–10 >10
pH 6.5 6.5–7.5 >7.5
COD (mg/ L) >10,000 4000–10,000 <4000
BOD5/COD >0.3 0.1–0.3 <0.1
Organic
compounds
80% volatile fat acids
(VFA)
5–30% VFA+ humic
and fulvic acids
Humic and fulvic
acids
Heavy metals Low–medium - Low
Biodegradabilit
y
Important Medium Low
( Sha Liu,2013)

6. Treatment
methods
Physio-
chemical
process
Physical
process
Chemical
process
Biological
process
Electro-
chemical
process
Anaerobic AerobicAnoxic
Biological
process
(Hongwei Sun et al., 2015).

7. 3. Anaerobic Process
• A processes which micro-organisms break
down biodegradable material in the absence
of oxygen.
• Widely used for treating strong leachate.
• In this process the organic matter is converted to
methane (CH4), carbon dioxide (CO2).
(Metcalf et al. 2003)

8. UASB (Up flow Anaerobic Sludge
Blanket)
• Continuous processes
• A single tank process & constructed out of
watertight material.
• Can achieve high removal of organic pollutants.

9. • Leachate enter the reactor from the bottom, and
flows upward.
• There is a sludge blanket and
treats the leachate as the leachate
flows through it.
• Bacteria living in the sludge,
break down organic matter by
anaerobic digestion transforming
into biogas
influent

10. 4. Aerobic Process
• The process that essentially requires the presence of
molecular oxygen for metabolic activity of micro-
organisms
• Process normally fails in absence of oxygen
• To supply required oxygen Natural methods
Artificial methods
(Sha liu, 2013 & Metcalf et al. 2003)

11. SBR (Sequencing Batch Reactor)
• Discontinuous processes
• Treat the wastewater using the microorganism's
microbial metabolism
• Treatment systems based on activated sludge
• Complete mix activated sludge system without a
secondary clarifier
• One basin is used to complete number of
different sequence. Aeration and clarification are
accomplished in the tank
(Metcalf et al. 2003)

12. • SBR is an activated sludge process in which all
major steps occur in the same tank.
(Amin Mojiri et al. 2012)
Filling

13. Our Task
AerobicAnaerobic
UASB SBR

14. Objectives
Main objective
• To determine performance of two stage
anaerobic-aerobic system in landfill leachate
treatment.
Specific objective
• To study the performance of combined UASB
and SBR system
• To enhance the nitrogen removal from landfill
leachate using UASB and SBR coupled system.

15. Scope
• Monitoring the variation of the following
parameters to determine the process and the
performance of UASB and SBR coupled system
UASB
COD
BOD5
pH
Temperature
Gas yield
TOC
MLVSS
NH4 +N
SBR
COD
BOD5
TN
MLVSS
NH4 + N
NO3 - N
Alkalinity

16. Methodology
Setup the models
Run the each model using water
Introduce the sludge to each model separately
Run the each model using synthetic wastewater
Combine both two models
Run the combined system using synthetic wastewater
Introduce synthetic leachate to the system
Test the performance of the combined system

17. Equalization
Tank
Methodology

18. 7th
Semester
Run the apparatus in water
Introducing micro organisms
Feeding the reactor by Synthetic
wastewater

19. 7th
Semester
Run the apparatus in water
Introducing micro organisms
Feeding the reactor by Synthetic
wastewaterRanala, ( Elephant house
ice cream factory)
Sri Dalada Maligawa
Treatment plant
UASB SBR
Anaerobic Aerobic

20. 7th
Semester
Run the apparatus in water
Introducing micro organisms
Feeding the reactor by Synthetic
wastewater

21. 7th
Semester
Run the apparatus by Synthetic
wastewater
Introducing micro organisms
Feeding the reactor

22. 8th
Semester
Run the apparatus by Synthetic
leachate
Data collection
Data entry preliminary analysis

23. Data Collecting points –forUASB

24. Data Collecting- For UASB
Parameter Influent Effluent
Reactor
Body Sludge
Gas
Outlet
COD √ √
BOD5 √ √
TOC √ √
TC √ √
IC √ √
TN √ √
MLVSS √ √ √
pH √ √
Temperature √ √
Daily
Once in week
Once in two week

25. Data Collecting points –forSBR

26. Data Collecting -ForSBR
Parameter Influent Effluent Reactor
BOD5 √ √
COD √ √
NO3
- - N √ √ √
NH4
+ -N √ √ √
TN √ √ √
MLVSS √
TSS √ √
PH √ √ √
DO √ √ √
Temperature √
Daily
Once in week
Once in two week

27. 8th
Semester
Run the apparatus by Synthetic
leachate
Data collection
Data entry preliminary analysis

28. Results & Discussion
• Temperature of the system
• Measured daily
• MLVSS
• Measured separately in each system
• Measured in two weeks
•For UASB – 7500 mg/l
•For SBR – 2500mg/l

29. • pH
• Measured daily
• Highly fluctuated in the agitator
Synthetic leachate
Sugar
• Effected to the other apparatus
• Manually adjusted

30. •BOD5 removal of the system
System UASB system SBR system Total system
Avg. efficiency(%) 61.46 78.45 91.72
0
50
100
150
200
250
300
350
400
450
BOD5(mg/l)
Weeks
UASB influent
UASB effluent
SBR effluent

31. • COD removal of the system
System UASB system SBR system Total system
Avg. efficiency(%) 21.46 31.67 46.44
1500
2000
2500
3000
3500
4000
4500
COD(mg/l)
Weeks
UASB influent
UASB effluent
SBR effluent

32. • NH4
+-N removal of the system
100
150
200
250
300
350
400
450
500
550
600
NH4
+-N(mg/l)
Weeks
UASB influent
UASB effluent
SBR effluent

33. • NO3
—N removal of the system
0
0.5
1
1.5
2
2.5
3
3.5
4
NO3
—N(mg/l)
Weeks
UASB influent
UASB effluent
SBR effluent

34. TN removal of the system
TN removal efficiency- 34.75%
100
150
200
250
300
350
400
450
500
550
600
TN(mg/l)
Weeks
UASB influent
UASB effluent
SBR effluent

35. •BOD5 removal of the SBR cycle
0
20
40
60
80
100
120
140
160
180
BOD5(mg/l)
Phases

36. • COD removal of the SBR cycle
1500
2000
2500
3000
3500
4000
COD(mg/l)
Phases

37. • NH4
+-N removal of the SBR cycle
300
350
400
450
500
550
NH4
+-N(mg/l)
Phases

38. • NO3
—N removal of the SBR
0
0.5
1
1.5
2
2.5
3
3.5
4
NO3
—N(mg/l)
Phases

39. Referances
• Amin Mojiri, Hamidi Abdul Aziz, Shuokr Qarani Aziz , Nastaein Qamaruz
Zaman, (2012). Review on Municipal Landfill Leachate and Sequencing
Batch Reactor (SBR) Technique. Vol 65, No. 7.
• Hongwei Sun, Yongzhen Peng, Xiaoning Shi, (2015). Advanced treatment of
landfill leachate using anaerobic–aerobic process: Organic removal by
multaneous denitritation and methanogenesis and nitrogen removal via
nitrite. vol177, pp. 337–345
• Metcalf and Eddy (2003) Wastewater Engineering Treatment and Reuse (4th
edition). Singapore: McGraw-Hill, Inc.
• Sha Liu, (2013). Landfill leachate treatment methods and evaluation of
Hedeskoga and Måsalycke landfills. Master Thesis number: 2013-07, Water
and Environmental Engineering, Department of Chemical Engineering, Lund
University.

40. Thank You