Question

From a contaminant transport viewpoint, describe the advantages and disadvantages of selecting in situ bioremediation to clean a groundwater supply aquifer contaminated with petroleum hydrocarbons from a punctured underground storage tank. Benzene is compound of concern.

Answer 1

Advantages:

• Present are a figure of advantages and difficulty in the use of in-situ bioremediation (Lee et al., 1988). Unlike other aquifer remediation technology, it can often be used to treat contaminants that are sorbed to aquifer capital or trapped in pore seats.

• In adding to action of the soaked zone, organic contaminants held in the unsaturated and tube zones can be treat when an diffusion gallery is used. The time necessary to treat subsurface contamination using in-situ bioremediation can often be faster than removal and action process.

• A petrol spill be remediated in 18 months by in-situ bioremediation, at the same time as pump-and-treat technique be unsurprising to require 100 survival in the direction of reduce the special treatment of petrol inside the way of potable water level (Raymond et al., 1986).

• In-situ bioremediation frequently expenses fewer than additional corrective option.

• The areal region of act by bioremediation be able to be improved than by means of additional corrective skill as the conduct move by means of the trail and be able to arrive at area that would or else live out-of-the-way.

Disadvantage:-

• There are also disadvantage to in-situ bioremediation program (Lee et al., 1988). Many natural compounds in the subsurface are opposed to to squalor.

• In-situ bioremediation more often than not require an acclimate inhabitants of bacteria which may not develop for recent spill or for unruly compound. Heavy metals and toxic concentration of natural compound may slow down activity of native microbes.

• Injection wells may become stopped up from plentiful microbial growth resultant from the adding of nutrients and oxygen.

• In-situ bioremediation is hard to put into do in low- permeability aquifers that do not authorize the convey of sufficient provisions of nutrients or oxygen to lively microbial populations.

• In adding, bioremediation project require nonstop monitor and preservation for winning action.