Denitrification of high-nitrate, high-salinity wastewater
Denitrification of a wastewater containing 36,000 mg/L NO 3 − (8,200 mg/L NO 3–N) with ionic strength of 3.0 has been achieved using activated sludge in bench-scale sequencing batch reactors. An activated sludge culture was acclimated to denitrify the wastewater at pH 9, by step-wise increase in was...
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Published in | Water research (Oxford) Vol. 33; no. 1; pp. 223 - 229 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
1999
Elsevier Science |
Subjects | |
Online Access | Get full text |
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Summary: | Denitrification of a wastewater containing 36,000
mg/L NO
3
− (8,200
mg/L NO
3–N) with ionic strength of 3.0 has been achieved using activated sludge in bench-scale sequencing batch reactors. An activated sludge culture was acclimated to denitrify the wastewater at pH 9, by step-wise increase in wastewater nitrate concentration from 2,700
mg/L NO
3–N to 5,400
mg/L NO
3–N and finally to 8,200
mg/L NO
3–N. Simultaneously, wastewater ionic strength was increased from 0.8 to 2.7 and to 3.0 (5, 16, and 18% total dissolved solids (TDSI). Although complete denitrification occurred, the maximum specific nitrate reduction rate decreased from 50 to 19
mg NO
3–N/g MLSS/h as wastewater nitrate and TDS concentration increased. Also, accumulation of nitrite increased and the maximum nitrite reduction rate decreased. A similar attempt to acclimate activated sludge to denitrify the high-TDS, high-nitrate wastewater at pH 7.5 was unsuccessful. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0043-1354 1879-2448 |
DOI: | 10.1016/S0043-1354(98)00177-8 |