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Updated: Jul 16, 2026

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
Published on: July 22, 2019
Relationship between the electric conductivity and phosphorus concentration variations in an enhanced biological
Kwang-Soo Kim1, Ji-Seon Yoo, Sungyoun Kim
1Construction Environment Research Dept., Korea Institute of Construction Technology 2311 Daehwa-dong, Ilsanseo-gu, Goyang-si, Gyeonggi-do 411-712, Korea. kskim@kict.re.kr
Abstract:
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.
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