A road accident involving a causes a spill of 10 000 l of benzene into the soil

Question

A road accident involving a causes a spill of 10 000 l of benzene into the soil uick cleanup recovers most of the substance, but some benzene reaches the shallow water table. S of this in The log ootano water rediment coefficient log Kew of benzene is 2.13. The material consists of Sandy with a bulk density of 1.8 g cm and a porosity of 0.3. The wei ght fraction of organic carbon in the aquifer sediment is 0.8 percent. The local horizontal groundwater flow velocity is 12 y Estimate the maximum horizontal distance over which the benzene is transported in 10 years. Assume that the benzene transport is only affected by retardation. (Hint choose an appropriate relation between Ken and K from Table 13.1).

Explanation / Answer

Given:

Bulk Density of the soil = 1800 kg/m3

KOW = 2.13

Time = 10 years

Weight fraction of organic content = 0.8

Ground water flow velocity = 12m per year

Total Benzene volume = 10000 liters

From the table for Aromatics,

LogKOC = 0.937 log (KOW)-0.006

log Koc = 0.937 * 2.13 - 0.006

Koc = 97.6809 lkg-1

Kd = 0.008*97.6809 = 0.7814472  lkg-1

Rf = 1+(1800/0.3)*0.0007814472 = 5.6886832 ~ 6

Ux/Rf = 12/5.688 = 2.1097

so in 10 years, the benezene would covered 21.097 m

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