Abstract for Poster - Department of Physics - Indian Institute of Science
Ryan Institute Research Day 2015 poster
1
1. Introduction In Ireland, 95% of municipal solid waste (MSW) landfill leachate is sent to municipal waste water treatment plants (WWTPs) for final treatment. The objective of this laboratory experiment was to examine the effect of two landfill leachate pre- treatments (aeration and coagulation) on nitrification efficiency in a typical wastewater (WW). C. Devroedt 1,2,3 , E. Clifford 1,2 , M. Healy 1,2 , R. Brennan *1,2 1 Civil Engineering, National University of Ireland, Galway, Ireland; 2 Ryan Institute, NUI Galway, Ireland; 3 Institut National des Sciences Appliquées de Lyon, Lyon, France; *Presenting author. E: [email protected] ; W: http://www.nuigalway.ie/leachate /; T: https:// twitter.com/LeachateNUIG 3. Results and Conclusions 2. Methods a. Collect wastewater (WW) from aeration tank of WWTP currently c. Pre-treatment 1 (aeration) b. Collect leachate samples: young (open or closed less than 5 years) (LL1) and intermediate age (closed > 5 years but less than 10) leachate (LL2). e. Raw and pre-treated landfill leachate added to WW in aerated beakers at rate of 4% by volume for 48 hours (DO > 2 mg L -1 ) d. Pre-treatment 2 (ferric chloride, rapid mixing, sludge settling and decanting) Air-diffuser Before (LL2) After 12 hours (LL2) Aeration tank mixed liquor Leachate storage tank Aeration apparatus 0 2 4 6 8 10 12 0 6 12 18 24 30 36 42 48 NH 4 -N (ammonium) (mgL -1 ) Time (hours) 0% 4% raw LL 4% coag LL 4% aer LL Leachate LL1 (COD: 260 mgL -1 ; BOD: 40 mgL -1 , NH 4 -N: 140 mgL -1 ) 0 20 40 60 80 100 120 0 6 12 18 24 30 36 42 48 Time (hours) Leachate LL2 (COD: 6,150 mgL -1 ; BOD: 2,000 mgL -1 , 1,340 NH 4 -N: mgL -1 ) Acknowledgements The authors wish to thank the Environmental Protection Agency for funding this project through a STRIVE fellowship (No. 2013-W-FS-13). 1. Landfill leachate increased aeration tank influent NH4-N compared to the control (0%) treatment. 2. Pre-treatment using aeration reduced initial NH4-N compared to raw leachate for both LL1 and LL2. 3. Coagulation did not reduce initial NH4-N, but NH4-N decreased during the experiment indicating that coagulation improved treatability of leachate. Recommendations These mitigation efforts should be accessed at field scale to determine suitability. Leachate samples (strength decreasing from left to right) High strength -high COD, NH 4 -N -high biodegradability Low strength -lower COD, NH 4 -N -low biodegradability LL1 LL2
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Transcript of Ryan Institute Research Day 2015 poster
1. IntroductionIn Ireland, 95% of municipal solid waste (MSW) landfill
leachate is sent to municipal waste water treatment
plants (WWTPs) for final treatment.
The objective of this laboratory experiment was to
examine the effect of two landfill leachate pre-
treatments (aeration and coagulation) on nitrification
efficiency in a typical wastewater (WW).
C. Devroedt1,2,3, E. Clifford1,2, M. Healy1,2, R. Brennan*1,2
1Civil Engineering, National University of Ireland, Galway, Ireland; 2Ryan Institute, NUI Galway, Ireland; 3Institut National des
Sciences Appliquées de Lyon, Lyon, France; *Presenting author. E: [email protected]; W:
http://www.nuigalway.ie/leachate/; T: https://twitter.com/LeachateNUIG
3. Results and Conclusions2. Methods
a. Collect wastewater (WW) from aeration tank of WWTP currently
c. Pre-treatment 1 (aeration)
b. Collect leachate samples: young (open or closed less than 5 years) (LL1) and intermediate age (closed > 5 years but less than 10) leachate (LL2).
e. Raw and pre-treated landfill leachate added to WW in aerated beakers at rate of 4% by volume for 48 hours (DO > 2 mg L-1)
d. Pre-treatment 2 (ferric chloride, rapid mixing, sludge settling and decanting)
Air-diffuser
Before (LL2) After 12 hours (LL2)
Aeration tank mixed liquor
Leachate storage tank Aeration apparatus
0
2
4
6
8
10
12
0 6 12 18 24 30 36 42 48
NH
4-N
(am
mo
niu
m)
(mgL
-1)
Time (hours)
0% 4% raw LL4% coag LL 4% aer LL
Leachate LL1 (COD: 260 mgL-1; BOD: 40 mgL-1, NH4-N: 140 mgL-1)
0
20
40
60
80
100
120
0 6 12 18 24 30 36 42 48
Time (hours)
Leachate LL2 (COD: 6,150 mgL-1; BOD: 2,000 mgL-1, 1,340 NH4-N: mgL-1)
AcknowledgementsThe authors wish to thank the Environmental Protection
Agency for funding this project through a STRIVE fellowship
(No. 2013-W-FS-13).
1. Landfill leachate increased aeration tank influent
NH4-N compared to the control (0%) treatment.
2. Pre-treatment using aeration reduced initial NH4-N
compared to raw leachate for both LL1 and LL2.
3. Coagulation did not reduce initial NH4-N, but NH4-N
decreased during the experiment indicating that
coagulation improved treatability of leachate.
Recommendations
These mitigation efforts should be accessed at field
scale to determine suitability.
Leachate samples (strength decreasing from left to right)
High strength-high COD, NH4-N
-high biodegradability
Low strength-lower COD, NH4-N-low biodegradability
LL1 LL2
