Question

Groundwater has the following concentrations:

O2 = 8 mg/L

NO3- = 15mg/L

SO42- = 35 mg/L

In a BTEX contaminant plume in the same aquifer, the dissolved iron concentration is 20 mg/L. Neglecting methanogenesis, what is the assimilative capacity of the aquifer for benzene?

Answer 1

Solution Given data Ground water has the following concentrations O₂ = 8mg IL NO3= 15mg IL So42 = 35mg/L first we need to know the assimilatine. Copacity for each process. In the books about Biorme diation is stablished the mass balance. for each process. asstmilatine capacity (AC) buy cierobic biodegradtion 0.32 mg of Benzene is degrated by ling of 02/L - 0.32 mg x 8mg = 2.56 mg/L AC by denitrification 0.21 mg of benzene te degraded by Img/L of No3 0-21 mg = 3-15 mg

AC by Sulfate Reduction: 0.22 mg of benzene is degraded by lugl of S042- 0-22mg x 35 ang = 7.7 mg AC by IRONe Reduction! 0.045 ing of Benzene is degraded by Imgleofa 0045 mg x 20mg = 009 mg Total Ac of the aquifer: 2-56 +301577.7 70.9 -14-31 mg