Pesticide Adsorption by Granular Activated Carbon Adsorbers. 1. Effect of Natural Organic Matter Preloading on Removal Rates and Model Simplification

Abstract

The adsorptive removal of periodic spikes of the trace synthetic organic chemicals (SOCs) simazine and asulam from water containing natural organic matter (NOM) was studied in pilot-scale granular activated carbon (GAC) adsorbers over a period of nearly 3 years. The SOC removal percentage obtained at any preloading time and bed depth was independent of the liquid-phase SOC concentration, and equations derived from the ideal adsorbed solution theory and a pore surface diffusion model validated this observation. The pseudo-steady-state SOC removal rate, (dC/dz), at each preloading time and bed depth was therefore first order with respectto the liquid-phase SOC concentration, C. Furthermore, the removal modulus, k, in the resulting SOC removal rate expression was a reflection of the solid-phase concentration of the NOM fraction that interfered with the adsorption of SOCs. Analysis of the removal modulus values indicated that the mass transfer zone of the NOM fraction competing with asulamtraveled more rapidlythrough the GAC adsorber than that competing with simazine. Given the similar molecular sizes of the targeted SOCs, this result was primarily explained by differences in SOC adsorbabilities, where the more weakly adsorbing asulam was less capable of displacing preloaded NOM. Consequently, the NOM fraction competing with asulam constituted a larger percentage of the total NOM than that competing with simazine.

Detoxification of pesticide waste via activated carbon adsorption process

“…Differential batch column reactor for the adsorption of pesticides atrazine, bromoxynil and diuron [58]. Pseudo-first order [56] natural organic matters into the adsorption streams) [47,60,61].…”

Surfactant Fouling of Nanofiltration Membranes: Measurements and Mechanisms

“…[3] Adsorption, on the other hand, is dependent on the solution chemistry and on both membrane and surfactant properties. [4][5][6][7][8] In the case of nonionic surfactants, a more hydrophobic membrane surface and/or surfactant gives rise to more adsorption and hence to more membrane fouling. In the case of ionic surfactants, not only the hydrophobicity but also the charge of the membrane and of the surfactant are important characteristics to explain the adsorbed amount and membrane fouling.…”

Rapid extraction and determination of atrazine and its degradation products from microporous mineral sorbents using microwave-assisted solvent extraction followed by ultra-HPLC-MS/MS

“…Adsorption by activated carbon, an efficient and effective method for removal of organic contaminants, has been commonly used for removing atrazine in potable water treatment [12]. Our research has shown that microporous minerals can serve as excellent sorbents for organic contaminants and minerals with more hydrophobic pore spaces exhibit higher sorption capacities [13][14][15].…”