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Answer: Thiobacillus denitrificans can do denitrification to remove excess nitrate.

Thiobacillus is a gram negative bacteria. denitrificans As the bacteria names, Thiobacillus denitrificans can do denitrification that will decrease the amount of nitrate in the ground water. 
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Answer:

Thiobacillus denitrificans is a species of bacteria that obtains its energy from carbon dioxide and inorganic compounds such as nitrogen in its environment. It is used in bioremediation (natural cleansing) of groundwater that contains excess nitrate, allowing the nitrates to be removed.

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