Salt inhibition on biological nutrient removal from saline wastewater in a sequencing batch reactor

Nutrient removal from synthetic wastewater was investigated using a four-step sequencing batch reactor (SBR) at different salt (NaCl) concentrations in order to determine the salt inhibition effects on biological nutrient removal. The nutrient removal process consisted of anaerobic, oxic, anoxic and...

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Bibliographic Details
Published in:Enzyme and microbial technology 2004-03, Vol.34 (3), p.313-318
Main Authors: Uygur, Ahmet, Kargı, Fikret
Format: Article
Language:English
Subjects:
Batch Reactors
Biological and medical sciences
Biological treatment of waters
Biotechnology
Environment and pollution
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
Nutrient removal
Salt inhibition
Sequencing batch reactor (SBR)
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Summary:Nutrient removal from synthetic wastewater was investigated using a four-step sequencing batch reactor (SBR) at different salt (NaCl) concentrations in order to determine the salt inhibition effects on biological nutrient removal. The nutrient removal process consisted of anaerobic, oxic, anoxic and oxic phases with hydraulic residence times (HRT) of 1/3/1/1 h and a settling phase of 3/4 h. Solid retention time (SRT) was kept constant at 10 days in all experiments. Salt content was varied between 0 and 6% (w/v) at eight different levels. Effects of salt inhibition on the rate and extent of COD, NH 4-N and PO 4-P removals were investigated. The rate and extent of COD, NH 4-N and PO 4-P removals decreased while the effluent nutrient concentrations and the sludge volume index (SVI) increased with increasing salt content.
ISSN:0141-0229
1879-0909
DOI:10.1016/j.enzmictec.2003.11.010