2. November 6 3,5 14 12,07 8,13 December 6

2. SEASONAL VARIATION OF BIOWASTE

Instead of using the average values of biowaste and
garden waste generated throughout the year, we considered a seasonal variation
of both, biowaste and garden waste. Considering the climate conditions, we used
the data of the city of Kaunas, Lithuania 2009 (Denafas et al., 2014).

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Figure xx: Monthly variation of MSW
generation and composition in Kaunas, Lithuania in 2009. (Denafas et al., 2014)

The data from
the graph was extracted to calculate the percentage of each of the fractions in
organic waste. The categories food waste, yard waste and other organic were
taken into account.

Month

other organic (kg/capita)

yard waste
(kg/capita)

food waste
(kg/capita)

% garden waste

% biowaste (w/o garden)

January

5

1,5

11

5,17

6,50

February

3

0

11

0

5,69

March

5

0,5

13

1,72

7,32

April

4

1,5

14

5,17

7,32

May

3,5

3

12,5

10,34

6,50

June

9

6

13

20,69

8,94

July

11

3

13

10,34

9,76

August

10

3

13

10,34

9,35

September

10

1,5

20

5,17

12,20

October

8

3,5

17

12,07

10,16

November

6

3,5

14

12,07

8,13

December

6

2

14

6,90

8,13

Total

80,5

29

165,5

100

100

Table x: monthly variation of biowaste

To simplify,
four seasons were considered: spring (March, April, May), summer (June, July,
August), autumn (September, October, November) and winter (December, January,
February). In the table below we can see the percentages of biowaste produced
in each of the seasons.

Season

% garden waste

% biowaste (w/o garden)

Spring

17,24

21,14

Summer

41,38

28,05

Autumn

29,31

30,49

Winter

12,07

20,33

Total

100

100

Table xx: Seasonal variation of biowaste

INPUT OF GARDEN WASTE

 

anual volume (m3/year)

anual mass (ton/year)

Density (ton/ m3)

DS (%)

Ods (%)

Impurities (%)

Garden waste

6000

859,5

0,15

81

79,3

4,5

 Table
xx: Garden waste

The amount of garden waste treated per year can be
calculated as follows:

In the table below the amount of garden waste that has
to be treated for every season is presented.

ton/season (w/o impurities)

ton/month (w/o impurities)

Spring

17,24%

148,17

48,31

Summer

41,38%

355,66

115,97

Autumn

29,31%

251,91

83,05

Winter

12,07%

103,74

34,58

Table xx: Garden waste per season

 

REFERENCES

Denafas, G., Ruzgas, T.,
Martuzevi?ius, D., Shmarin, S., Hoffmann, M., & Mykhaylenko, V. et al.
(2014). Seasonal variation of municipal solid waste generation and composition
in four East European cities. Resources, Conservation And Recycling, 89,
22-30. http://dx.doi.org/10.1016/j.resconrec.2014.06.001