reuse of sewage sludge problems and...
TRANSCRIPT
REUSE OF SEWAGE SLUDGE –
PROBLEMS AND POSSIBILITIES
UNIVERSITY OF ZAGREBFACULTY OF CIVIL ENGINEERING
21-23 May, Athens – Greece
7.840.7958.778.722
9.859.848
11.503.800
12.986.620
0
2.000.000
4.000.000
6.000.000
8.000.000
10.000.000
12.000.000
14.000.000
1995 2000 2005 2010 2020
SYSTEM CAPACITY(1.500.000 PE)
WASTEWATER(120.000.000 m3/year)
SLUDGE INCINERATION(80.000 tons/year)
SEWAGE SLUDGE ASH - ISSA(18.000 tons/year)
STABILIZED AND DEWATERED SLUDGE
(80.000 tons/year)
WWTP
Oxide percentage in ISSA [%]
OxideRange
(literature review)
WWTP Karlovac, CRO
800 ⁰C
WWTP Koprivnica, CRO
800 ⁰C
SO3 0.24 – 12.40 5.83 – 7.66 1.15 – 1.40
Fe2O3 4.70 – 20.00 8.21 – 9.46 0.31 – 0.40
SiO2 17.27 – 50.60 2.87 – 7.94 0.41 – 0.49
CaO 1.93 – 31.30 37.64 – 42.12 92.82 – 93.83
MgO 1.40 – 3.22 4.23 – 4.53 0.71 – 0.77
Al2O3 6.32 – 19.09 11.72 – 16.46 0.89 – 1.19
P2O5 1.67 – 18.17 16.02 – 17.21 0.80 – 0.83
TiO2 0.29 – 1.00 0.76 – 1.03 0.04 – 0.05
Na2O 0.32 – 1.26 0.28 0.03 – 0.04
K2O 0.62 – 2.34 1.26 – 1.31 0.12 – 0.13
Mixture ISSA
share [%]
w/c ratio
Incineration temperature
MixtureISSA
share [%]
w/c ratio
Incineration temperature
M0 - A 0 0.45 - M10 – C 10 0.55 800 °C
M0 - B 0 0.50 - M20 – A 20 0.45 800 °C
M0 - C 0 0.55 - M20 – B 20 0.50 800 °C
M5 – A 5 0.45 800 °C M20 – C 20 0.55 800 °C
M5 – B 5 0.50 800 °C M30 – A 30 0.45 800 °C
M5 – C 5 0.55 800 °C M30 – B 30 0.50 800 °C
M10 – A 10 0.45 800 °C M30 – C 30 0.55 800 °C
M10 – B 10 0.50 800 °C M5 – A*; M20 – C**
Note: * mixtures with ISSA incinerated at 900 °C** mixtures with ISSA incinerated at 1000 °C
(Monzo et al., 2003) (Monzo et al., 2003) (Garces et al., 2008)
4,60
9,65
7,148,34
2,77
6.05
0
2
4
6
8
10
12
0 7 14 21 28
Fle
xu
ral
stre
ngh
t[M
Pa]
Age [days]
800 °C
M0-B
M5-B
M10-B
M20-B
M30-B
4,60
7,39
10,20
2,78
5,62
8,64
0
2
4
6
8
10
12
0 7 14 21 28
Fle
xu
ral
stre
ngh
t[M
Pa
]
Age [days]
900 °C
M0-B
M5-B*
M10-B*
M20-B*
M30-B*
4,60
9,65
7,24
3,22
5,95
8,91
0
2
4
6
8
10
12
0 7 14 21 28
Fle
xu
ral
stre
ngh
t[M
Pa]
Age [days]
1000 °C
M0-B
M5-B**
M10-B**
M20-B**
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20
Com
pre
ssiv
est
ren
gh
t[M
Pa]
ISSA share (%)
1000 °C
v/c= 0,45
v/c= 0,50
v/c= 0,55
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30
Com
pre
ssiv
est
ren
gh
t[M
Pa]
ISSA share (%)
900 °C
v/c= 0,45
v/c= 0,50
v/c= 0,550
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30
Com
pre
ssiv
est
ren
gh
t[M
Pa]
ISSA share (%)
800 °C
v/c= 0,45
v/c= 0,50
v/c= 0,55
Thank You !
Acknowledgments
This work has been fully supported by Croatian Science Foundation under the project "7927 -Reuse of sewage sludge in concrete industry – from infrastructure to innovative construction products".