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Effects of operational parameters on the treatment of nitrate‐rich wastewater by autohydrogenotrophic denitrifying bacteria
Author(s) -
Mousavi Seyyedalireza,
Ibrahim Shaliza,
Aroua Mohamed Kheireddine
Publication year - 2014
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12076
Subject(s) - denitrifying bacteria , nitrate , nitrite , chemistry , denitrification , wastewater , volatile suspended solids , environmental chemistry , nuclear chemistry , inorganic chemistry , environmental engineering , activated sludge , nitrogen , environmental science , organic chemistry
Abstract The effects of the C / N ratio, as well as hydrogen gas and substrate concentrations, on the treatment of nitrate‐rich wastewater by autohydrogenotrophic denitrifying bacteria in sequencing batch reactors were investigated. Among the various C / N ratios applied in this study, a C / N ratio of 4 was found to be the most suitable ratio that resulted in faster growth and adaptation. The denitrification rate improved with less accumulation of nitrite with increasing H 2 sparging time. Moreover, an increase in nitrate concentration resulted in high nitrite accumulation. The nitrite accumulated to 601 mg/L NO 2 ‐ N when the nitrate concentration was 1000 mg/L NO 3 – ‐ N . The specific degradation rates for nitrate and nitrite were found to be 27.8 mg NO 3 − ‐ N /g MLVSS /d and 50 mg NO 2 − ‐ N /g MLVSS /d, respectively, when the C / N ratio was 2, and H 2 as electron donor was sparged for 1 min with 2 h interval.