(3) Risk classification of waste pile
① Calculation of risk score F
F ¼
X 3
i¼1
c i X i
Wherein:
c i the weight of the ith hazard factor;
X i the score of the ith hazardous factor.
② Risk classification
According to the calculated score (F), the risk of waste pile hazard is divided into 3
levels: (Table 5.97).
(4) Waste hazard risk assessment
Considering that the average organic matter content of Niufang Village North
Landfill is 6.73%, its service life is 3 years, and its waste soil volume of the
domestic refuse filling zone is about 13,761 m
3 , the risk level of pollution hazard of
the landfill is defined as “moderate risk”. The detailed evaluation results are shown
in Table 5.98.
Table 5.95 Evaluation scores of hazardous factors
Score
0–2.5
2.5–5.0
5.0–7.5
7.5–10.0
Organic matter (%)
<5
5–10
10–20
>20
Closure time (year)
>10
5–10
3–5
< 3
Landfill waste volume (Â10,000 m
3
)
<0.5
0.5–5
5 –30
>30
Table 5.96 Hazard factors weight
Influencing factor (X i )
Organic matter content
Closure time
Landfill waste volume
Weight (c i )
0.3
0.2
0.5
Table 5.97 Risk
classification of waste pile
hazard
Risk level
High risk
Moderate risk
Low risk
Score
! 7
3 –7
3
280
5 Application Cases