Nitrate nitrogen levels upto 425 mg l−1 (D.O = 2.5 mg l−1) were treated under aerobic conditions by activated sludge mixed with Thiosphaera pantotropha. Efficiency of nitrate nitrogen removal ranged from 75–85% for different reactors operated at HRT between 0.5 to 1 day and SRT of 2–8 days.
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Kshirsagar et al. (1995) studied this question.
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