ABSTRACT
Gas, liquid, and solid waste can be treated through biochemical means, either in situ or ex situ. In the ex situ process the contaminated soil or fluid is collected and treated in an external location, whereas in the in situ process the treatment is carried out in the same place. The treatments could be classified as aerobic or anaerobic depending on whether the process requires air or not. Anaerobic processes consume less energy, produce low excess sludge, and maintain enclosure of odor over conventional aerobic process. This technique is also suitable when the organic content of the liquid effluent is high.
