Adsorption-desorption of organic micropollutants by powdered activated carbon and coagulant in drinking water treatment

Sang, Davin; Cimetière, Nicolas; Giraudet, Sylvain; Tan, Reasmey; Wolbert, Dominique; Cloirec, Pierre Le

doi:10.1016/j.jwpe.2022.103190

Cited by 5 publications

(3 citation statements)

References 45 publications

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“…The removal of alachlor was >98%, 77% and >98% for original AC, AC1S and AC1N, respectively, and 98%, 49% and 98% for AC2, AC2N and AC2S, respectively, at a 25 mg L −1 adsorbent dose. Likewise, Sang et al 84 reported that with adsorbent dosages ranging from 10 to 40 mg L −1 , >80% alachlor was removed using the original PAC from water sources containing 16.3 ± 2.0 ng L −1 alachlor. Ormad et al 85 observed 75% removal of alachlor and metolachlor in a 5-min contact time with a 10 mg L −1 PAC dose.…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Simultaneous removal of mixed pesticides and natural organic matter from surface waters by nitric and chlorosulfonic acid functionalized powdered activated carbon

Aykut‐Senel,

Ozgur,

Bakirdere

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDSeveral studies have addressed the adsorption of pesticides such as alachlor, acetochlor, metolachlor, and fenthion from water and wastewater, yet the interaction of these compounds with natural organic matter (NOM) complicates their effective removal due to competitive adsorption effects. This study aims to fill this gap by exploring the efficacy of nitric acid and chlorosulfonic acid‐modified activated carbons in removing both pesticides and NOM under realistic environmental conditions.RESULTSModifications using nitric acid and chlorosulfonic acid significantly improved the pesticide removal capabilities of Norit SX F Cat (AC1) adsorbents. While both the original and chlorosulfonic acid‐modified adsorbents showed comparable efficacy in pesticide removal, nitric acid‐modified AC Puriss (AC2) adsorbents were less effective. Remarkably, a 100 mg/L dose of both original and modified powdered activated carbons (PACs) removed over 98% of all four pesticides from water samples. Additionally, a lower 25 mg/L dose effectively achieved similar removal rates, demonstrating their utility as feasible options for water treatment.CONCLUSIONModifying powdered activated carbons with nitric acid and chlorosulfonic acid has been proven to enhance their structural and adsorptive properties significantly. These modifications led to improved pesticide removal efficiencies, particularly with the chlorosulfonic acid‐modified PACs, which demonstrated superior performance in adsorption tests. The study also highlighted the competitive adsorption posed by low‐molecular‐weight organic substances in water, which compete with pesticides for active adsorption sites.This article is protected by copyright. All rights reserved.

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Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Simultaneous removal of mixed pesticides and natural organic matter from surface waters by nitric and chlorosulfonic acid functionalized powdered activated carbon

Aykut‐Senel,

Ozgur,

Bakirdere

et al. 2024

J of Chemical Tech & Biotech

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“…In this process, adsorbent materials are used to capture and retain the micropollutants on their surface through different chemical interactions. Adsorbents materials shall ideally have high surface areas and specific affinity towards the target compounds to allow for effective removal [5]. Activated carbons (ACs) and zeolites are among the most studied materials.…”

Section: Introductionmentioning

confidence: 99%

Investigation of biologically active zeolite: Role of colonization in the removal of 14C-labelled sulfamethoxazole in wastewater

Cuomo,

König,

Zanardini

et al. 2024

Journal of Water Process Engineering

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“…The occurrence of natural organic matter in water sources can pose challenges to the effective removal of pesticides. It is considered that natural organic matter (NOM) in various molecular weights has different competitive impacts on micropollutant removal by the adsorption process from water sources, and in general, low-molecular-weight organics, which cannot be removed by coagulation, show the highest competition during micropollutant removal. − The size of NOM affects the adsorption efficiency of micropollutants by decreasing the adsorbent capacity. While low-molecular weight NOM compete for direct sites, high-molecular weight NOM cause pore entrance blockage.…”

Section: Introductionmentioning

confidence: 99%

Impact of Natural Organic Matter Competition on the Adsorptive Removal of Acetochlor and Metolachlor from Low-Specific UV Absorbance Surface Waters

Yilmaz,

Altiparmak,

Dadaser-Celik

et al. 2023

ACS Omega

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Although activated carbon adsorption is a very promising process for the removal of organic compounds from surface waters, the removal performance for nonionic pesticides could be adversely affected by co-occurring natural organic matter. Natural organic matter can compete with pesticides during the adsorption process, and the size of natural organic matter affects the removal of pesticides, as low-molecular-weight organics directly compete for adsorbent sites with pesticides. This study aims to investigate the competitive impact of low-molecular-weight organics on the adsorptive removal of acetochlor and metolachlor by four commercial powdered activated carbons. The adsorption features of selected powdered activated carbons were evaluated in surface water samples collected from the influent stream of the filtration process having 2.75 mg/L organic matter and 0.87 L/mg-m specific UV absorbance. The adsorption kinetics and capacities were examined by employing pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic models and modified Freundlich and Langmuir isotherm models to the experimental data. The competitive removal of acetochlor and metolachlor in the presence of natural organic matter was evaluated for varied powdered activated carbon dosages on the basis of UV and specific UV absorbance values of adsorbed organic matter. The adsorption data were well represented by the modified Freundlich isotherm, as well as pseudo-second-order kinetics. The maximum organic matter adsorption capacities of the modified Freundlich isotherm were observed to be 120.6 and 127.2 mg/g by Norit SX Ultra and 99.5 and 100.6 mg/g by AC Puriss for acetochlor-and metolachlorcontaining water samples, respectively. Among the four powdered activated carbons, Norit SX Ultra and AC Puriss provided the highest natural organic matter removal performances with 76 and 72% and 71 and 65% for acetochlor-and metolachlor-containing samples, respectively. Similarly, Norit SX Ultra and AC Puriss were very effective for adsorbing aromatic organics with higher than 80% specific UV absorbance removal efficiency. Metolachlor was almost completely removed by higher than 98% by Norit SX Ultra, Norit SX F Cat, and AC Puriss, even at low adsorbent dosages. However, an adsorbent dose of 100 mg/L and above should be added for all powdered activated carbons, except for Norit SX F Cat, for achieving an acetochlor removal performance of higher than 98%. The competition between low-molecular-weight organics (low-specific UV absorbance) and acetochlor and metolachlor was more apparent at low adsorbent dosages (10−75 mg/L).

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Adsorption-desorption of organic micropollutants by powdered activated carbon and coagulant in drinking water treatment

Cited by 5 publications

References 45 publications

Simultaneous removal of mixed pesticides and natural organic matter from surface waters by nitric and chlorosulfonic acid functionalized powdered activated carbon

Simultaneous removal of mixed pesticides and natural organic matter from surface waters by nitric and chlorosulfonic acid functionalized powdered activated carbon

Investigation of biologically active zeolite: Role of colonization in the removal of 14C-labelled sulfamethoxazole in wastewater

Impact of Natural Organic Matter Competition on the Adsorptive Removal of Acetochlor and Metolachlor from Low-Specific UV Absorbance Surface Waters

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