1. In-Situ Bioremediation

In-situ bioremediation is the process of using bioremediation to remove dangerous chemicals that are present in the soil or water in place  meaning the contamination is addressed where it is located. 

In -situ bioremediation can be either intrinsic (using naturally occurring microorganisms) or engineered (introducing nutrients or specific microorganisms). Examples include bioaugmentation, bioslurping, biosparging, natural attenuation, bioventing, and biostimulation. 

Advantages:
Lower risk of cross-contamination, potentially lower costs, and can be more effective in some cases.
Disadvantages:
 
May take longer, less manageable, and mostly effective in loose soil. 
 
Examples:
Treating contaminated groundwater by adding nutrients to stimulate microbial activity, or using bioaugmentation to introduce specific bacteria to degrade a particular pollutant.