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Red de Revistas Científicas de América Latina y el Caribe, España y Portugal
MEXICO CITY’S MUNICIPAL SOLID WASTE CHARACTERISTICS AND
COMPOSITION ANALYSIS
Alfonso DURÁN MORENO*, Manuel GARCÉS RODRÍGUEZ, Adriana Rocío VELASCO,
Juan Carlos MARÍN ENRIQUEZ, Rafaela GUTIÉRREZ LARA, Abril MORENO GUTIÉRREZ
and Norma Angélica DELGADILLO HERNÁNDEZ
Facultad de Química, Universidad Nacional Autónoma de México
*Autor responsable: alfdur@servidor.unam.mx
(Recibido septiembre 2011, aceptado noviembre 2012)
Key words: energy content, composition, volumetric weight, ultimate analysis
ABSTRACT
Mexico City generates approximately 12 500 000 kg of municipal solid wastes (MSW)
a day. Nowadays, waste management of the refuse material is of high concern since
the local landfll has reached its limit capacity and its closure is imminent, thereby al
-
ternative disposal methods must be evaluated. The objective of this paper is to analyze
the composition of MSW produced in Mexico City through a sampling campaign. In
comparison to previous oFfcial reports oF Mexico City’s MSW characterization, in this
study the physical composition analysis has been updated and additionally, chemical and
physicochemical analysis are included, such as ultimate composition, energy content
and heavy metals content.
Palabras clave: contenido de energía, composición, peso volumétrico, análisis último
RESUMEN
La Ciudad de México genera diariamente alrededor de 12 500 000 kg de residuos só-
lidos urbanos (RSU). Actualmente, el manejo de este material de rechazo es de gran
preocupación debido a que el relleno sanitario Bordo Poniente ha alcanzado su capa-
cidad límite y su cierre es inminente, así que se deben evaluar métodos de disposición
alternativos. El objetivo de este documento es analizar la composición de los RSU de
la Ciudad de México a través de una campaña de muestreo. En comparación con otros
estudios ofciales previos acerca de la caracterización de los RSU de la Ciudad de
México, en este estudio la composición física de los RSU es actual y adicionalmente
se incluyen análisis químicos y fsicoquímicos, tales como la composición última, el
contenido de energía y el contenido de metales pesados.
Rev. Int. Contam. Ambie. 29 (1) 39-46, 2013
A. Durán Moreno
et al.
40
INTRODUCTION
Mexico City is the most populated city (INEGI
2005) in the country, about 97 % of its municipal
solid wastes (MSW) is disposed in the local landfll
“Bordo Poniente” (GDF 2008), which has reached
its limit capacity since 2008 (DGSU 2009).
There are not available areas to construct a new
landfll in Mexico City or its surroundings. In Fact, the
Mexico City’s government has interest in eliminating
the use oF landflls and implementing new Facilities to
separate, to treat and to dispose with energy recovery
(GDF 2010).
Studies of characterization of MSW in Mex-
ico City, date to 1999 by the Japan International
Cooperation Agency (JICA 1999) and the latest to
2009, coordinated by the Mexico City’s Science and
Technology Institute (GDF 2010). Both analyses
did not consider detailed information about element
composition or energy content.
In this work, the MSW samples were collected
from the 13 Transfer Stations (TS) located in Mexico
City as it is shown in
fgure 1
. The sampling cam-
paign was conducted from November to December,
2009. The analyses were made on homogeneous
samples from each transfer unit facility, raised in a
period of 3 weeks. Volumetric weight and composi-
tion were analyzed in situ, while other determinations
such as carbon, hydrogen, oxygen, nitrogen, sulphur,
ashes, heavy metals content and calorifc value were
measured in laboratory.
BACKGROUND
Overview of the study area
Mexico City is divided into 16 boroughs named
as follows: Álvaro Obregón, Azcapotzalco, Benito
Juárez, Coyoacán, Cuajimalpa, Cuauhtémoc, Gus-
tavo A. Madero, Iztacalco, Iztapalapa, Magdalena
Contreras, Miguel Hidalgo, Milpa Alta, Tláhuac,
Tlalpan, Venustiano Carranza and Xochimilco. Mexi-
co City is the second most populated city in Latin
America with an estimated of 8 841 916 habitants in
2009 (CONAPO 2009). The per capita daily gene-
ration of MSW is 1.45 kg, higher than the national
average (0.98 kg).
MSW management in Mexico City starts with
collection by vehicles with a loading capacity bet-
ween 3000-5000 kg. Next stage is transportation to
one of the 13 TS located on 12 of the 16 boroughs
in the city (see
Fig. 1
). Finally waste material is
shipped to vehicles with larger capacities to either
the composting plant, at the local landfll “Bordo
Poniente” or to material recovery facilities. The
names and codes of reference to each TS are shown
below on
table I
, along with a data resume of the
sampling stage. Waste generated on the boroughs
without TS are processed in other facilities. MSW
generated in Cuajimalpa borough (CJ) are handled
at the TS1, MSW from Iztacalco (IZ) at the TS8,
MSW from Magdalena Contreras (MC) at the TS1
and TS11, and MSW generated in Tlahuac (TL) at
the TS13.
MATERIAL AND METHODS
Size and frequency estimations for samples
Sample size was estimated based on the ASTM
D5231 92 (2008) (Standard Test Method for the
Determination of the Composition of Unprocessed
Municipal Solid Waste). Sample size relies on the
component in highest proportion, the desired reliability
and other statistical parameters. It resulted on a size
of 15 samples to obtain representativeness from each
TS with an accuracy of 90 %. The 15 samples were
raised in one day in each TS, from different collecting
vehicles, each sample weighted less than 50 kg and
Fig. 1
. TS and boroughs distribution map
TS11
TS10
TS13
TS1
TS9
TS2
TS6
TS5
TS12
TS4
TS3
TS
8T
S7
TL
IZ
MC
CJ
MEXICO CITY’S MSW CHARACTERISTICS AND COMPOSITION ANALYSIS
41
fnally a compose sample was Formed (500 kg). The
sampling method was random selection; the sampling
characteristics are in
table I.
Sampling procedure
The working area was selected based on the TS
operating conditions, therein samples were homoge-
nized. MSW was handled from the discharge area or
from collecting vehicles and carried to the working
area in a 0.2 m
3
container. A 150 kg capacity ±oor
scale was used to measure each MSW sample. A
total average weight of the composed sample was
500 kg.
Procedure for homogeneous sample preparation
The procedure was performed with the objective
of accurately representing the entire material. The
methodology followed the Mexican Standard Test
Method “NMX-AA-015-1985” (SECOFI 1985c),
which suggests dividing the total sample into four
portions and discarding two portions, then repea-
ting the procedure until a signifcant weight sample
is obtained (~ 50 kg). This method and additional
procedures of shredding and grinding assure the
representativeness of the samples.
Determinations for physical composition
Physical composition measurements were per-
formed in situ according to Mexican Standard Test
Method “NMX-AA-022-1985“(SECOFI 1985b).
Sub-product classifcation was based on this technical
standard and it was modifed with additional catego
-
ries. Sample weight was measured at each TS by a
150 kg capacity ±oor scale. The subproducts were
weighted on a 20 kg beam balance (0.1 g sensitivity).
Volumetric weight
Volumetric weight was evaluated in situ accor-
ding to Mexican Standard Test Method “NMX-
AA-019-1985” (SECO²I 1985a). ²ew modifcations
were applied to the procedure performance: a propor-
tional fraction of material was subtracted from each
portion until a 0.1 m
3
container was flled. A 150 kg
±oor scale was used.
Moisture content
Moisture content measurements were carried out
under the Mexican Standard Test Method “NMX-
AA-016-1984” (SECO²I 1984a) which specifes
that each sample most be homogeneous and with a
particle size of 5 centimetres. Between 15 to 30 g
of sample were placed in an oven at 403 K until the
weight was constant. An analytical weight balance
with 0.001 g sensitivity and a laboratory oven were
used. The oven maintains a constant temperature at
423 K (± 5 K, 1.5 K sensitivity).
Ultimate analysis
The ultimate analysis of MSW involves determi-
nation of mass percentage of carbon (C), hydrogen
(H), oxygen (O), nitrogen (N), sulphur (S) and ash
and a FISON EA/NA1110 element analyzer was
employed. The device measurements are based
in sample burning at 1273 K in an oxygen atmos-
phere. Mass percent is given from composition of
±ue gases. Mexican Standard Test Method “NMX-
AA-018-1984“ (SECOFI 1984b) was followed to
measure ash content with modifcations to avoid
fre through the procedure. Dried samples between
1.5 to 4 g were put into a muF±e For 1 h at 1073 K.
The cooled samples were weighted. A balance (0.1 g
TABLE I.
TS CHARACTERISTICS AND SAMPLING
TS
TS characteristics
Sampling characteristics
Code
MSW transferred daily
(1×10
3
kg/d)
Total collected sample
(kg)
Sample quantity for subproduct
quantifcation (kg)
Álvaro Obregón
TS1
1170
535
51
Azcapotzalco
TS2
1238
511
51
Benito Juárez
TS3
422
522
49
Coyoacán
TS4
1411
503
50
Cuauhtémoc
TS5
910
494
50
Gustavo A. Madero
TS6
816
521
50
Iztapalapa I
TS7
1293
762
50
Iztapalapa 2
TS8
1306
760
50
Miguel Hidalgo
TS9
599
492
54
Milpa Alta
TS10
76
209
52
Tlalpan
TS11
493
496
49
Venustiano Carranza
TS12
717
414
42
Xochimilco
TS13
475
423
50
A. Durán Moreno
et al.
42
sensitivity) and a mufFe able to maintain a constant
temperature of 1073 K (± 10 K) were used.
Heavy metals detection
Heavy metals quantification was conducted
following EPA Method 3051 (USEPA 2007). The
samples were prepared by an acid digestion process.
This stage was followed by microwave digestion,
on a Milestone microwave model 1200 mega. The
samples were diluted to detect the metals. Finally,
separate detection of each metal was carried out by
speci±c wavelength using a spectrophotometer; the
process was performed in a atomic absorption spec-
trometer (AAnalyst 700, Perkin Elmer).
²or Cu, Zn and Mn determination, the Fame tech
-
nique was employed, consisting in an air-acetylene
gas mixture, a burner, an electrodeless discharge lamp
(EDL) and HNO
3
as solvent. For Pb and Cd determi-
nation, by a graphite furnace, argon gas and hallow
cathode lamps (HCL) were employed. To quantify
Hg, the hydride in cold and hot technique was used,
and for As, a Fow injection system for atomic spec
-
troscopy (FIAS) was used, both techniques utilized a
borohydride solution for hydride generation.
Energy content
To estimate the energy released during a combus-
tion process for each sample, a differential scanning
calorimeter (DSC, Model 1) Mettler Toledo® was
employed. The samples from each TS were homo-
genized and grinded to dust. In this experiment 3 to
5 mg samples (wt % dry basis) were placed on a
40 µL aluminium containers, and then heated from
303 K to 773 K at a constant heat rate (3 KJ/min)
and a constant oxygen Fow. As a result, a thermo
-
graph was obtained, where power versus temperature
is plotted. The heating value is calculated by heat
curve integration. This DSC-1 has a low deviation
of reproducibility (<5 %) if it is compared to a pump
calorimeter which is higher than 15 %. It guarantees
both a full combustion and a temperature measure-
ment from start to end of the process (Mettler Toledo
2010). This equipment has been used to characterize
MSW or MSW thermal reactions (Paul
et al.
2011
and Rundong
et al.
2007).
RESULTS AND DISCUSSION
Hereby results for samples composition are
reported for each transfer unit and also a weighted
average based on the quantity of waste transferred
in each station (See
Table A.1
).
Physical composition
As a result, the main composition obtained for the
MSW generated in Mexico City is shown in
table II
;
the detailed composition is in the Appendix,
table A.I
.
Almost half of the waste materials generated in
Mexico City are organic (49.5 %); a portion of them
can be treated by biological technologies to produce
biogas or by composting. About 13.16 % are plas-
tics with 6.46 % low density polyethylene bags as
main component; 5.7 % is paper and 4 % cardboard.
Such materials also have recycling potential, along
with glass (2.65 %), ferrous metals (1.16 %), and
non-ferrous metals (0.13 %). An important amount
of sanitary wastes is found (10.77 %). There are ha-
zardous and special wastes in a low proportion that
must be removed from the MSW Fow.
Ultimate analysis
Results of ultimate analysis are show in
table III
.
The main component in the samples was carbon
in a range from 50.4 % (TS4) to 75.5 % (TS3).
The component with the lowest occurrence was
sulphur, which was detected only in TS7 with 0.2
% (wt % dry basis). Weighted average indicates
that chemical composition for the Mexico City’s
MSW is:
C
- 61.2 %,
H
-15.4 %,
N
-2.92 %,
S
-0.02 %,
O
-7.45 % and
Ash
-13.0 %; resulting on a formula for
the volatile fraction as follows:
C
7, 125
H
22,066
O
938
N
309
S
The weighted average content of carbon (61.2
wt % dry basis) is similar to plastics carbon content
(wt % dry basis) (Pichtel 2005).
TABLE II.
PHYSICAL COMPOSITION OF THE MEXICO
CITY MSW (wt %)
Category
%wt
Plastics
13.16
Textiles
3.64
Organics
49.5
Sanitary waste
10.77
Paper
5.89
Cardboard
4.03
Construction material
1.88
Ferrous material
1.16
Wood
0.45
Fines
0.8
Aluminium
0.29
Glass
2.65
Special waste
1.41
Hazardous waste
0.18
Other
4.19
MEXICO CITY’S MSW CHARACTERISTICS AND COMPOSITION ANALYSIS
43
The Mexico City’s MSW ash content value is in
the typical range of 10-20 % for wastes (Tchobano-
glous 2002).
Physical characteristics
Moisture, organic fraction and ashes content, as
well as volumetric weight from Mexico City’s MSW
are presented in
table V
. The organic fraction of
MSW contributes with the highest amount of mois-
ture, as it can be seen in other characterization studies
that report values around 65 % of moisture content
for the organic fraction (Menkipura
et al.
2008 and
Igonia
et al.
2007). The organic fraction (49.5 %) in
the MSW inFuences the moisture content (33.7 %).
Volumetric weight is useful in designing manage-
ment strategies such as transportation; these values
depend on the physical composition, moisture content
and compaction level. Weighted average for volumet-
ric weight (185.9 kg/m
3
) is above the common range
(150-180 kg/m
3
) reported for MSW (Pichtel 2005).
This difference relies on the inFuence of organic
waste from TS Iztapalapa. It contributes 24 % to the
total amount of MSW handled in transfer stations
and a high volumetric weight of 288.0 kg/m
3
. The
organic waste contained in this stream is high because
its source is the main suppling center of fruits and
vegetables in the city. The values obtained were in a
range from 145.7 to 288.0 kg/m
3
.
High heating value
Many variables, such as moisture affect the
energy content, Mexico City’s MSW average high
heating value (HHV) is of 10.9 MJ/kg. Values for
each TS are in
table V
. The low heating value
(LHV) has been calculated according to equation
(1) Pichtel (2005):
LHV = HHV [MJ/kg] – 0.0244(M + 9H)
(1)
For equation (1) moisture (M) and hydrogen (H)
variables represent the percentages of water, and
hydrogen on dry basis, respectively. The LHV for
the moisture and hydrogen content determined in
this research (33.7 %, and 15.4 %, respectively) is
6.7 MJ/kg.
Heavy metals content
Regarding heavy metals, they are present in
small amounts in Mexico City’s MSW as shown in
table VI
. These elements are present as a result of
batteries, consumer electronics, ceramics, light bulbs
and paint chips, among others. The metals As, Cu,
Cr, Hg, Pb, Zn and Mn are harmful to human and
animal health at certain concentrations and therefore
should receive close monitoring. For instance, in
MSW thermal treatment, heavy metals are monitored
in ashes (Shi
et al.
2008).
TABLE III.
ULTIMATE ANALYSIS (wt % DRY)
Component
TS
Av.
TS1
TS2
TS3
TS4
TS5
TS6
TS7
TS8
TS9
TS10
TS11
TS12
TS13
C
63.3
66.2
75.5
50.4
65.9
59.9
64.3
57.9
61
63.3
60.4
55.5
64.8
61.2
H
10.9
16.6
14.9
21.1
3.8
13.9
19.7
16.9
13.9
17.5
12.6
19.2
14.9
15.4
O
3.5
3.2
1.2
16
18.8
9.7
0.6
0.9
7.7
2.7
13.8
11.9
6.1
7.45
N
7.8
0.8
1.6
1.9
0.1
0.8
4
6.8
2.7
1.9
1.8
0.9
0.8
2.92
S
ND
ND
ND
ND
ND
ND
0.2
ND
ND
ND
ND
ND
ND
0.02
Ash
14.5
13.1
6.8
10.6
11.5
15.8
11.1
17.5
14.7
14.7
11.4
12.6
14.5
13.0
ND: Non-detected
TABLE IV.
ULTIMATE ANALYSIS FOR DIFFERENT MATERIALS (wt% DRY BASIS)
Component
Mexico City’s
MSW
Plastics
1
Coal
2
Waste
Polyethylene
3
Refuse derived
fuel
4
C
61.16
60.0
78.2
85.81
44.0
H
15.41
7.2
4.93
13.86
5.7
O
7.45
22.8
13.3
0
47.2
N
2.92
NR
1.45
0.12
1.4
S
0.02
NR
1.69
0.06
0.7
Ash
13.04
10.0
8.5
0.15
1.1
Source:
1
Pichtel 2005;
2
Ptasinski, Prinsa y Pierik 2007;
3
He
et al.
2009 and
4
Higman. 2003
NR: Non- reported
A. Durán Moreno
et al.
44
Comparing values for heavy metals content in
ashes from an incineration process in China repor-
ted by Shi
et al.
(2008) it can be stated that values
for As, Cu (except TS8 sample), Cr, Mn (except
TS8 sample), Pb and Zn contents are below values
reported in any stage of the process measurements
(fy ash From boiler, bottom ash and fy ash From
bag ±lter).
CONCLUSIONS
Characterization was realized for samples collec-
ted from a campaign considering the 13 TS located in
Mexico City. Average values are weighted, according
to the quantity of MSW transferred in each station.
The organic fraction is the most abundant (49.5 %).
The recyclable material composed by cardboard,
paper and plastics has an average value of 24 %. The
general Formula For Mexico City’s MSW resulted on
C
7,125
H
22,066
O
938
N
309
S
, (wt % dry basis), average
content of moisture of 33.7 % and an ash content of
13 %. The MSW management includes several strate-
gies such as minimization in source, recycling, reuse,
thermal treatment, ±nal disposition among others.
Results of this study can be considered to evaluate
strategies. The energy content (HHV) obtained for
TABLE VI.
HEAVY METALS CONTENT [mg/kg
MSW
]
TS
As
Cu
Cr
Hg
Mn
Pb
Zn
TS1
0.35
15.06
39.86
0.84
42.93
86.88
117.61
TS2
0.00
30.75
99.31
0.92
57.32 171.48
156.30
TS3
1.01
38.05
60.95
0.84
41.65
82.98
86.33
TS4
0.18
15.04 144.87
0.69
100.36
28.66
94.47
TS5
0.27
38.04
16.95
2.11
50.39
35.65
506.74
TS6
0.40
27.58
17.49
0.92
54.14
28.13
14.08
TS7
0.40
27.60
12.66
0.92
160.14 147.96
288.62
TS8
0.61 422.00
56.56
2.41 3299.51 124.98
539.15
TS9
0.13
15.04
47.42
1.51
40.36
37.72
435.84
TS10
0.74
24.45
89.84
3.08
100.42
26.69
76.39
TS11
0.92
26.07
56.45
1.46
27.83 132.82
291.45
TS12
0.18
18.19
14.06
0.84
52.90
26.07
241.78
TS13
0.40
30.72
49.25
1.29
47.88
43.37
109.21
Av.
0.35
72.13
56.40
1.24
456.86
85.00
245.87
TABLE V.
CHARACTERISTICS O² MEXICO CITY’S MSW
TS1
TS2
TS3
TS4
TS5
TS6
TS7
TS8
TS9
TS10
TS11
TS12
TS13
Av
Moisture (%)
49.8
27.5
14.6
39.5
36.4
39.6
36.6
24.8
20.7
36.9
31.8
27.1
30.8
33.7
Organics (%)
41.9
45.1
42.0
48.5
46.6
45.7
62.7
63.8
50.2
35.4
39.9
47.0
41.6
49.5
Volumetric
weight kg/m
3
145.7
146.1
182.4
152.4
147.7
166.9
232.3
288.0
200.3
160.0
192.9
201.4
145.7
185.9
Energy content
(HHV) [MJ/kg]
10.3
11.1
12.2
10.7
10.0
9.7
10.7
11.4
14.0
9.5
11.5
9.7
12.0
10.9
Mexico City’ MSW is 10.9 MJ/kg. This value is
expected to increase in the near future as soon as the
separated collection is achieved.
ACKNOWLEDGEMENTS
This work was supported by the Mexico City Go-
vernment and the Mexican Science and Technology
National Council (CONACyT) through the project
CONACyT-GDF DF-2008-C01-94261.
Special thanks to our staff: N. Cabrera Delgado,
J. T. Espinoza Sandoval , I. E. García Lizalde, S. Ma-
yorga Castillo, S. Palacios González, J. J. Rodríguez
Escobar and L. Romano Pardo for their technical
support for the MSW sampling campaign; and to Ph.
D. E. Rincon A. for providing assistance.
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46
TABLE A.I.
PHYSICAL COMPOSITION IN EACH TS AND WEIGHTED AVERAGE
Material
TS1
TS2
TS3
TS4
TS5
TS6
TS7
TS8
TS9
TS10
TS11
TS12
TS13
Av
S. D.
Cardboard
3.84
3.28
5.95
3.03
2.93
3.00
1.27
1.57
2.26
5.55
5.64
2.82
2.75
2.93
1.57
Leather
0.00
0.00
0.00
0.00
0.28
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.02
0.08
Animal bone
0.34
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.04
0.09
Aluminium cans
0.15
0.13
0.25
0.42
0.09
0.22
0.30
0.08
0.47
0.00
0.00
0.00
0.15
0.20
0.15
Ceramics
0.51
1.12
0.00
1.71
0.00
0.39
0.08
0.78
0.00
5.49
0.00
1.55
0.96
0.72
1.51
Wood
1.09
1.14
0.34
0.37
0.50
0.19
0.28
0.20
0.14
0.70
0.38
0.00
0.08
0.45
0.35
Construction
material
0.46
4.69
0.00
0.00
0.00
0.46
3.55
4.53
4.47
0.00
0.00
0.77
0.00
1.87
1.98
Electric waste
0.00
0.00
0.00
0.00
0.01
0.09
0.00
0.00
1.04
0.00
0.00
0.00
0.00
0.06
0.29
Ferrous metals
0.00
0.94
1.49
1.67
0.75
2.36
0.83
1.66
1.07
0.80
1.10
1.09
1.37
1.16
0.57
Non-ferrous metals
1.23
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.13
0.34
Sanitary pads and
diapers
5.56
3.15
9.50
4.08
1.94
6.37
5.86
1.92
4.78
15.98
9.11
6.69
9.57
5.05
3.93
Aluminium paper
0.16
0.24
0.00
0.00
0.19
0.00
0.00
0.00
0.00
0.09
0.00
0.43
0.00
0.09
0.13
Printed paper
1.09
3.44
2.05
1.47
4.45
1.16
0.93
0.95
1.39
1.01
0.65
1.10
2.68
1.76
1.11
Magazine paper
1.20
0.43
0.98
1.34
0.49
0.26
0.61
0.23
1.34
2.28
0.00
1.97
0.46
0.79
0.70
Wax paper
0.00
0.00
0.89
1.24
0.09
0.00
0.00
1.42
1.16
1.32
0.00
0.00
0.00
0.44
0.60
Sanitary paper
5.77
6.59
0.89
1.70
9.58
8.46
4.94
5.11
5.62
6.84
6.94
7.29
7.57
5.72
2.40
Other paper
0.84
1.53
1.32
0.00
2.64
1.08
1.88
0.00
1.33
0.00
0.00
1.35
1.81
1.08
0.83
Newspaper
1.34
1.67
2.97
1.34
2.47
2.93
1.64
1.65
1.06
0.85
3.15
1.53
1.87
1.82
0.76
Plastic N-1 PET
1.11
1.60
2.15
0.89
1.51
0.75
0.63
0.20
2.38
1.70
3.22
1.47
1.06
1.21
0.84
Plastic N-2 PEAD
0.44
1.70
1.54
0.84
0.78
0.58
1.24
1.10
2.01
1.97
1.91
2.35
0.91
1.20
0.63
Plastic N-3 PVC
0.17
0.32
0.21
0.38
0.17
0.11
0.00
0.02
0.06
0.46
0.18
0.25
0.04
0.17
0.14
Plastic N-4
0.28
0.35
0.55
0.61
0.27
0.99
0.25
0.50
0.25
0.60
0.28
0.61
0.19
0.43
0.22
Plastic N-5
0.59
0.47
0.87
1.76
0.92
0.64
0.53
0.43
0.57
0.67
1.28
1.31
0.91
0.84
0.39
Plastic N-6
0.45
0.37
0.68
0.79
0.52
0.40
0.44
0.51
0.64
0.73
1.27
0.83
0.58
0.58
0.25
Plastic N-7
1.19
1.05
0.33
1.12
0.45
1.01
0.24
0.81
0.47
0.78
0.70
1.59
1.03
0.85
0.39
Plastic bag
8.29
8.10
6.09
8.37
8.13
6.61
2.79
4.44
4.56
6.07
6.46
6.13
7.30
6.46
1.69
Fines
0.29
0.07
3.22
0.38
0.17
1.01
0.20
0.86
2.72
0.85
2.93
0.57
0.97
0.80
1.15
Organics
41.87
45.09
41.98
48.47
46.58
45.70
62.73
63.76
50.24
35.40
39.94
46.96
41.57
49.50
8.34
Tetra pack
0.59
2.13
1.20
1.13
1.48
0.75
0.43
0.65
0.98
1.21
1.67
1.21
1.86
1.10
0.47
Textiles
9.38
0.66
5.99
3.06
3.44
5.60
0.91
2.65
2.42
3.30
2.34
3.97
6.45
3.64
2.30
Polyurethane
8.41
0.58
0.96
0.67
0.77
0.86
0.61
0.40
0.52
0.37
0.46
0.00
0.61
1.42
2.19
Colour glass
0.74
0.00
0.34
1.09
1.15
0.00
0.35
0.42
0.81
0.00
4.17
0.90
0.15
0.72
1.09
Transparent glass
1.31
4.17
0.80
0.98
2.22
2.92
0.92
1.56
2.17
2.05
1.91
2.01
2.50
1.93
0.91
Shoes
0.00
0.00
0.00
0.00
0.00
0.00
0.72
0.00
1.63
0.62
0.79
2.11
0.00
0.35
0.71
Total
100
100
100
100
100
100
100
100
100
100
100
100
100
100
-
Special waste*
0.61
4.01
0.82
0.98
1.52
2.06
0.04
0.65
0.31
0.93
1.19
0.94
3.96
1.35
1.01
Hazardous waste**
0.00
0.10
0.26
0.35
0.10
0.33
0.25
0.46
0.00
0.09
0.04
0.00
0.00
0.19
0.15
Other***
0.71
0.89
5.41
9.73
3.41
2.71
4.55
0.50
1.12
1.28
2.28
0.21
0.63
2.94
2.65
Total
100
100
100
100
100
100
100
100
100
100
100
100
100
100
-
*Include medical drugs, batteries, tires, and sharp objects, ** Toxic, and biological wastes ***Any material not included in previous
classifcations
APPENDIX
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