Groundwater Risk Assessment of a Rock Cave Type Landfill with Nontraditional Solid Waste

Table 3

Prediction results of total chromium pollution plume in groundwater.

	Zone 1		Zone 2		Zone 3		Zone 4		Zone 5
	Maximum horizontal migration distance (m)	Polluted area (m2)	Maximum horizontal migration distance (m)	Polluted area (m2)	Maximum horizontal migration distance (m)	Polluted area (m2)	Maximum horizontal migration distance (m)	Polluted area (m2)	Maximum horizontal migration distance (m)	Polluted area (m2)
1 year	0.00	0.00	158.33	0.01	200.00	0.07	366.67	0.10	166.67	0.04
5 year	95.42	0.02	130.17	0.04	213.33	0.12	395.00	0.22	387.50	0.13
10 year	120.50	0.03	137.67	0.065	222.50	0.13	404.17	0.22	416.67	0.14
20 year	158.48	0.03	180.82	0.07	253.57	0.16	396.20	0.27	419.97	0.18

Note. The maximum horizontal migration distance is the maximum horizontal distance from the center of the pollution plume [19]. Taking the maximum value of the standard index, the prediction factor of this simulation is total Cr. According to the landfill scheme, the aquifer with an elevation of 170m ∼ 185m is set as the polluted layer. The concentration of leakage pollutants is 15 mg/L. The final migration boundary concentration of pollutants refers to the class III standard limit in the “Standard for groundwater quality” [22].