TY - JOUR
T1 - An OUR-based approach to determine the toxic effects of 2,4-dichlorophenoxyacetic acid in activated sludge
AU - Meriç, Süreyya
AU - Eremektar, Gülen
AU - Çiner, Fehiman
AU - Tünay, Olcay
PY - 2003/7/18
Y1 - 2003/7/18
N2 - This study uses the oxygen uptake rate (OUR) measurement to measure toxicity effects of 2,4-dichlorophenoxyacetic acid (2,4-D) on activated sludges fed with the wastewater from a small domestic wastewater treatment plant and peptone-based synthetic wastewater. Two 2l lab-scale batch reactors were run in parallel with the same F/M ratios (0.4mg COD per mg VSS per day) to assess the inhibition effects of 2,4-D concentrations between 25 and 75mgl-1 considering at least a 100% dilution rate, as compared with a pesticide industry effluent containing 20,000-40,000mgl-1 COD, reaches a central treatment plant. It was noted that the OUR was decreased to 15 and 30%, respectively, when adding 75mgl-1 of 2,4-D to the domestic and synthetic reactors,. Meanwhile, the addition of 25 plus 50mgl-1 of 2,4-D in sequence to the domestic wastewater reactor did not significantly affect the OUR profile. The OUR-based inhibition definition has been used in this research since the OUR methods have been frequently used and cited in the literature to study toxicity effects. However, the origin of the sludge used in the testing is also important. Synthetic wastewater may simulate the toxicity studies but with a higher response than actual systems, since the microorganisms are considerably becoming substrate-selective.
AB - This study uses the oxygen uptake rate (OUR) measurement to measure toxicity effects of 2,4-dichlorophenoxyacetic acid (2,4-D) on activated sludges fed with the wastewater from a small domestic wastewater treatment plant and peptone-based synthetic wastewater. Two 2l lab-scale batch reactors were run in parallel with the same F/M ratios (0.4mg COD per mg VSS per day) to assess the inhibition effects of 2,4-D concentrations between 25 and 75mgl-1 considering at least a 100% dilution rate, as compared with a pesticide industry effluent containing 20,000-40,000mgl-1 COD, reaches a central treatment plant. It was noted that the OUR was decreased to 15 and 30%, respectively, when adding 75mgl-1 of 2,4-D to the domestic and synthetic reactors,. Meanwhile, the addition of 25 plus 50mgl-1 of 2,4-D in sequence to the domestic wastewater reactor did not significantly affect the OUR profile. The OUR-based inhibition definition has been used in this research since the OUR methods have been frequently used and cited in the literature to study toxicity effects. However, the origin of the sludge used in the testing is also important. Synthetic wastewater may simulate the toxicity studies but with a higher response than actual systems, since the microorganisms are considerably becoming substrate-selective.
KW - 2,4-D
KW - Activated sludge
KW - OUR
KW - Synthetic wastewater
KW - Toxicity
UR - http://www.scopus.com/inward/record.url?scp=0042121062&partnerID=8YFLogxK
U2 - 10.1016/S0304-3894(03)00147-X
DO - 10.1016/S0304-3894(03)00147-X
M3 - Article
C2 - 12927732
AN - SCOPUS:0042121062
SN - 0304-3894
VL - 101
SP - 147
EP - 155
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 2
ER -