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Coprecipitation of phthalic acid complexed with iron during iron precipitation.Methane gas production resulting from anaerobic microbial waste degradation.Microbial reduction of sulfates to sulfides. Reduction of ferric to ferrous iron resulting from Eh and pH changes due to microbial waste degradation.Retention of organic waste acids by adsorption and anion exchange on the injection-zone mineral constituents.Although limited degradation of the organic waste constituents did occur in the subsurface after waste injection, the reaction products are as detrimental to the groundwater quality as the waste itself. In addition, the formation of iron hydroxide, iron carbonate, terephthalic acid precipitates, and the production of carbon dioxide gas probably were factors in the plugging of the injection zone adjacent to the wells and eventual abandonment of the system. The corrosive nature of the organic acids may have been a factor in causing waste leakages into shallower zones at the two injection wells and at certain observation wells. This study has shown that the organic wastes of this plant were reactive rather than inert after injection into the subsur-face environment at this study site, and that the nature of this reactivity should be an important factor in ascertaining the compatibility of an industrial organic waste with the subsurface, into which it is to be placed.

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