rainwater from other units into the operating unit via such system, and greatly
reducing the amount of percolate produced.
According to the feasibility study report, the amount of percolate is calculated by
the following formula.
Q j à ¼ 1=1000  Ij  C1  A1 þ C2  A2 þ C3  A3
ð
Þ
The most unfavorable conditions are assumed:
A1 Unit area where landfilling is performed
A2 Landfill unit paved with interim cover
A3 Landfill unit paved with closure cover
I j
Average precipitation data for the fifteen years from 1991 to 2005.
(The annual average of the area is 1072.8 mm/a, and the largest annual precipitation ever-known is 1817.8 mm.)
C1 1-E/I (where E is the actual evaporation and I is the precipitation)
C2 0.1C1
C3 about 0.008 C1.
The evaporation, E is calculated using the BlaneyCriddle method.
Er ¼ 24:5  K  Cj  Tj
Cj ¼ Dj=
X
Dj  100%
Er Monthly potential evaporation (mm)
Dj Monthly sunshine duration (h)
Cj Ratio of the monthly sunshine duration to the annual sunshine duration (%)
Tj Average monthly temperature (Fahrenheit) F = 1.8C + 32
K Vegetation coefficient, taken as 0.6.
In general, the actual evaporation is 60–70% (which is taken as 70% in this
calculation) of the potential evaporation.
The runoff water from outside the landfill area will not be considered since the
horizontal anti-seepage course is used in the hazardous wastes landfill. It is calculated that the average percolate yield is 16 m
3
/d and the maximum percolate yield
is 35 m
3 /d (Table 5.119).
C. Pollutants concentration in percolate
The water quality of the percolate is hard to be assessed accurately due to the very
complicated composition of the landfill wastes and the difficult-to-estimate amounts
of various landfilled wastes. The hazardous wastes transported to the landfill mainly
include the pharmaceutical wastes, pesticide wastes, organic solvent wastes, rectifying (distilling) slags, surface treatment wastes, incinerator residues,
zinc-containing wastes, arsenic-containing wastes, and non-ferrous metal smelting
360
5 Application Cases
reducing the amount of percolate produced.
According to the feasibility study report, the amount of percolate is calculated by
the following formula.
Q j à ¼ 1=1000  Ij  C1  A1 þ C2  A2 þ C3  A3
ð
Þ
The most unfavorable conditions are assumed:
A1 Unit area where landfilling is performed
A2 Landfill unit paved with interim cover
A3 Landfill unit paved with closure cover
I j
Average precipitation data for the fifteen years from 1991 to 2005.
(The annual average of the area is 1072.8 mm/a, and the largest annual precipitation ever-known is 1817.8 mm.)
C1 1-E/I (where E is the actual evaporation and I is the precipitation)
C2 0.1C1
C3 about 0.008 C1.
The evaporation, E is calculated using the BlaneyCriddle method.
Er ¼ 24:5  K  Cj  Tj
Cj ¼ Dj=
X
Dj  100%
Er Monthly potential evaporation (mm)
Dj Monthly sunshine duration (h)
Cj Ratio of the monthly sunshine duration to the annual sunshine duration (%)
Tj Average monthly temperature (Fahrenheit) F = 1.8C + 32
K Vegetation coefficient, taken as 0.6.
In general, the actual evaporation is 60–70% (which is taken as 70% in this
calculation) of the potential evaporation.
The runoff water from outside the landfill area will not be considered since the
horizontal anti-seepage course is used in the hazardous wastes landfill. It is calculated that the average percolate yield is 16 m
3
/d and the maximum percolate yield
is 35 m
3 /d (Table 5.119).
C. Pollutants concentration in percolate
The water quality of the percolate is hard to be assessed accurately due to the very
complicated composition of the landfill wastes and the difficult-to-estimate amounts
of various landfilled wastes. The hazardous wastes transported to the landfill mainly
include the pharmaceutical wastes, pesticide wastes, organic solvent wastes, rectifying (distilling) slags, surface treatment wastes, incinerator residues,
zinc-containing wastes, arsenic-containing wastes, and non-ferrous metal smelting
360
5 Application Cases