Diverse mercury-tolerant strains were isolated from the bioremediated soil. Notably, after soil bioremediation process nitrogen-fixing and nitrifying bacteria significantly increased. Mercury pollution strongly decreased nitrogen-fixing and nitrifying bacterial communities in agricultural soils. MSR33 cell concentrations, thioglycolate, and mercury concentrations influence mercury removal. Bioremediation in the RDB removed 82% mercury. The effects of mercury and bioremediation on nitrogen cycle microorganisms were studied by qPCR. An agricultural soil was contaminated with mercury (II) (20–30 ppm) and subjected to bioremediation using strain MSR33 in a custom-made RDB. The aims of this study are to evaluate the bioremediation of mercury-polluted agricultural soil using Cupriavidus metallidurans MSR33 in a rotary drum bioreactor (RDB) and to characterize the effects of mercury pollution and bioremediation on nitrogen cycle microorganisms. Nitrogen cycle microorganisms are essential in agricultural soils and may be affected by mercury pollution.
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