TY - JOUR
T1 - The effects of diquat dibromide on biological wastewater treatment plants
AU - Randall, C. W.
AU - Cokgor, E. U.
AU - Kisoglu, Z.
AU - Punrattanasin, W.
AU - Erdal, U.
AU - Sriwiriyarat, T.
PY - 2003
Y1 - 2003
N2 - The objective of the study was to investigate the fate and effects of diquat dibromide which is the active ingredient in formulations used to control the growth of roots into sewers when applied as Razorooter and mixed with raw sewage, settled sewage, and activated sludge, and when introduced into activated sludge wastewater treatment systems. Both fully aerobic and biological nutrient removal (BNR) activated sludge systems were used for experimental purpose, and both continuous flow and batch reactors were used. The sorption of diquat by both raw sewage particles and activated sludge suspended solids was determined. Diquat dibromide concentrations ranged from 0.93 to 12.6mg/L in the influent flow. Both the fully aerobic and two full biological nutrient removal systems were fed municipal sewage spiked with diquat dibromide, and operated at a mixed liquor temperature of 10°C and an MCRT of 10 days. One of the BNR systems was a control system. The results showed that only about 20% of the diquat in raw sewage flow was removed by adsorptions to the sewage solids, but 80% or more of the diquat was removed in activated sludge systems. When the influent diquat dibromide concentration was approximately 1 mg/L, over 99% of the diquat dibromide was removed by the activated sludge process. Some of the removal was believed to be by biodegradation. The diquat dibromide used in this study had no observable detrimental effects on any of the biological processes of the continuous flow fully aerobic and BNR activated systems.
AB - The objective of the study was to investigate the fate and effects of diquat dibromide which is the active ingredient in formulations used to control the growth of roots into sewers when applied as Razorooter and mixed with raw sewage, settled sewage, and activated sludge, and when introduced into activated sludge wastewater treatment systems. Both fully aerobic and biological nutrient removal (BNR) activated sludge systems were used for experimental purpose, and both continuous flow and batch reactors were used. The sorption of diquat by both raw sewage particles and activated sludge suspended solids was determined. Diquat dibromide concentrations ranged from 0.93 to 12.6mg/L in the influent flow. Both the fully aerobic and two full biological nutrient removal systems were fed municipal sewage spiked with diquat dibromide, and operated at a mixed liquor temperature of 10°C and an MCRT of 10 days. One of the BNR systems was a control system. The results showed that only about 20% of the diquat in raw sewage flow was removed by adsorptions to the sewage solids, but 80% or more of the diquat was removed in activated sludge systems. When the influent diquat dibromide concentration was approximately 1 mg/L, over 99% of the diquat dibromide was removed by the activated sludge process. Some of the removal was believed to be by biodegradation. The diquat dibromide used in this study had no observable detrimental effects on any of the biological processes of the continuous flow fully aerobic and BNR activated systems.
KW - Diquat dibromide
KW - Inhibition and toxicity
KW - Municipal wastewater
KW - Wastewater treatment
UR - http://www.scopus.com/inward/record.url?scp=0141509907&partnerID=8YFLogxK
U2 - 10.1081/ESE-120023454
DO - 10.1081/ESE-120023454
M3 - Article
C2 - 14524697
AN - SCOPUS:0141509907
SN - 1093-4529
VL - 38
SP - 2453
EP - 2463
JO - Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
JF - Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
IS - 10
ER -
