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FIGURE 17.4 Geobacter sulfurreducens is the dominant metal-reducing microorganism isolated from subsurface environments and aquifers. It oxidizes aromatic hydrocarbons with Fe(III) as the electron acceptor. It can also oxidize organic pollutants while reducing other metals such as Mn(IV), U(VI), Te(VII), Co(VI), and Au(III). (Image courtesy of D. Lovely, University of Massachusetts. Reproduced from Anonymous (2003.)

TABLE 17.8 Environmental Conditions Influencing Biodegradation

Parameter

Condition required for microbial activity

Optimum for oil degradation

Soil moisture

25-28% of water holding capacity

30-90%

Soil pH

Worm Farming

Worm Farming

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