Relationship between the electric conductivity and phosphorus concentration variations in an enhanced biological nutrient removal process

Phosphorus release and uptake in a sequencing batch reactor were monitored by the simple online measurements of electric conductivity (EC) and oxidation-reduction potential (ORP), and the result was verified by the measurement of phosphate concentration changes. The influence of nitrate ion presence...

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Bibliographic Details
Published in:Water science and technology 2007, Vol.55 (1-2), p.203-208
Main Authors: Kim, Kwang-Soo, Yoo, Ji-Seon, Kim, Sungyoun, Lee, Hee Ja, Ahn, Kwang-Ho, Kim, In S
Format: Article
Language:English
Subjects:
Aerobic conditions
Anaerobic conditions
Anaerobiosis
Anoxia
Anoxic conditions
Batch reactors
Biological activity
Bioreactors
Correlation
Electric Conductivity
Electrical resistivity
Jar tests
Magnesium
Metal concentrations
Metals
Mineral nutrients
Nitrates - chemistry
Nitrates - metabolism
Nutrient concentrations
Nutrient release
Nutrient removal
Oxidation
Oxidation-Reduction
Oxidation-reduction potential
Phosphates
Phosphorus
Phosphorus - analysis
Phosphorus - isolation & purification
Phosphorus - metabolism
Phosphorus removal
Potassium
Redox potential
Redox reactions
Removal
Time Factors
Uptake
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - isolation & purification
Water Pollutants, Chemical - metabolism
Water Purification - methods
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Summary:Phosphorus release and uptake in a sequencing batch reactor were monitored by the simple online measurements of electric conductivity (EC) and oxidation-reduction potential (ORP), and the result was verified by the measurement of phosphate concentration changes. The influence of nitrate ion presence on the phosphorus removal was evaluated by a jar test operated in the cyclic anaerobic (anoxic)-aerobic condition. The relationships of EC, ORP and metal species with phosphorus concentrations were investigated. Under strict anaerobic conditions, EC showed positive correlation with phosphorus concentrations, but it became negligible under anoxic conditions with nitrate present. Strong inverse correlation was found between ORP values and phosphorus concentration. The increase and decrease of magnesium and potassium ions took place in accordance with phosphorus release and uptake, and the relationship between the metal species and phosphorus changes was clearer in the anaerobic condition than anoxic condition.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2007.053