• AWWA WQTC55210
Provide PDF Format

Learn More

AWWA WQTC55210

  • Role of NOM Molecular Weight in PAC Adsorption Equilibrium and Kinetics of Atrazine: A Simulation Study Using Model Compounds
  • Conference Proceeding by American Water Works Association, 01/01/2001
  • Publisher: AWWA

$12.00$24.00


Two model compounds, poly(styrene sulfonate) (MW = 1,800 Dalton) (PSS- 1.8k) and p-dichlorobenzene (DCB), were selected to simulate the competitive effects of two important molecular weight fractions of natural organic matter (NOM) on atrazine adsorption. Two types of powdered activated carbon (PAC) were used. The effects of both simultaneous adsorption and preloading with model compounds on adsorption equilibrium and kinetics were investigated. The model compounds were found to affect atrazine adsorption through two different mechanisms due to their size difference: direct competition for sites by p-DCB, and pore constriction/blockage by PSS-1.8k. p-DCB significantly reduced atrazine adsorption capacity but had no effect on atrazine surface diffusion rate. The effect of PSS-1.8k on atrazine adsorption capacity was very small, but preloading PAC with PSS-1.8k lowered the atrazine surface diffusion coefficient by several orders of magnitude. The pore size distribution of the PAC was found to play an important role in competitive adsorption. A high mesopore surface area could alleviate pore blockage significantly. Includes 11 references, table, figures.

Related Products

AWWA WQTC60611

AWWA WQTC60611

Comparison of an Anionic Polymer to No Polymer Addition for Treating Filter Backwash Water..

$12.00 $24.00

AWWA MTC64524

AWWA MTC64524

Integrated Approach to Construction and Startup of the 96 mgd Lakeview WTP for the Region of Peel..

$12.00 $24.00

AWWA INF52174

AWWA INF52174

Field Performance Monitoring of a Sliplined Watermain..

$12.00 $24.00

AWWA ACE59836

AWWA ACE59836

Water Conservation in Georgia Bringing Efficiency into Mainstream Thinking..

$12.00 $24.00