Removal of organic matter from wastewater reverse osmosis concentrate using granular activated carbon and anion exchange resin adsorbent columns in sequence

Recently, chelating agents have been widely applied to remove heavy metals for their highly effective capacities. In this study, three kinds of adsorption materials, 719 strongly basic anion exchange resin, γ-Al2O3 and activated carbon, were investigated to remove copper(II) under the existence of chelating agent EDDS. Adsorption isotherm and kinetics of copper(II) were assessed in batch experimental systems, pH and initial concentrations were also conducted to evaluate the effects on copper(II) removal. Results indicated the adsorption capacity with three absorbents was enhanced from 0.62, 7.26, 6.73 mg/g to 17.21, 24.68, 24.90 mg/g respectively when the chelating agent EDDS existing in aquatic phase. The experimental isotherms are fitted to Langmuir and Freundlich models, results show that 719 strongly basic anion exchange resin and γ-Al2O3 have good correlation coefficients obtained from Langmuir model, and activated carbon is better to fit the Freundlich model.

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Impact of Powdered Activated Carbon and Anion Exchange Resin on Photocatalytic Treatment of Textile Wastewater

Journal of Environmental Protection ◽

10.4236/jep.2015.63020 ◽

2015 ◽

Vol 06 (03) ◽

pp. 191-203 ◽

Cited By ~ 5

Author(s):

Preethi Grace Theva Neethi Dhas ◽

Holger Gulyas ◽

Ralf Otterpohl

Keyword(s):

Activated Carbon ◽

Anion Exchange ◽

Exchange Resin ◽

Anion Exchange Resin ◽

Textile Wastewater ◽

Powdered Activated Carbon

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Inactivation of Herbicides by Activated Carbon and other Adsorbents

Weed Science ◽

10.1017/s0043174500030794 ◽

1969 ◽

Vol 17 (1) ◽

pp. 16-19 ◽

Cited By ~ 47

Author(s):

David L. Coffey ◽

G. F. Warren

Keyword(s):

Biological Activity ◽

Activated Carbon ◽

Cation Exchange ◽

Anion Exchange ◽

Exchange Resin ◽

Anion Exchange Resin ◽

Cation Exchange Resin ◽

Bentonite Clay ◽

Test Plant ◽

Root Bioassay

A root bioassay was used to compare the adsorption of herbicides by activated carbon with that of muck soil, bentonite clay, a cation exchange resin, and an anion exchange resin. The effectiveness of different adsorbents was determined by comparing the concentrations of herbicide required to give 50% root inhibition of the test plant. Of eight herbicides tested, six were more strongly adsorbed by activated carbon than by any of the other adsorbents. The relative amount of adsorption by activated carbon as measured by the reduction in biological activity was as follows: isopropyl N-(3-chlorophenyl)-carbamate (CIPC) > α,α,α,trifluro-2,6-dinitro-N, N-dipropyl-p-toluidine (trifluralin) > 2,4-dichlorophenoxyacetic acid (2,4-D) > N,N-dimethyl-2,2-diphenylacetamide (diphenamid) > dimethyl 2,3,5,6-tetrachloroterephthalate (DCPA) > 4,6-dinitro-o-sec-butylphenol (DNBP) > 3-amino-2,5-dichlorobenzoic acid (amiben). The biological activity of 1,1'-dimethyl-4,4'-bipyridinium salt (paraquat), a cationic herbicide, was not reduced by activated carbon, but was reduced by bentonite clay and the cation exchange resin. DNBP was more strongly adsorbed by the anion exchange resin than by activated carbon. Desorption from activated carbon varied greatly for the herbicides tested. The most readily desorbed herbicide was 2,4-D while CIPC and DNBP showed little or no desorption.

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Chlorsulfuron Dissociation and Adsorption on Selected Adsorbents and Soils

Weed Science ◽

10.1017/s0043174500067230 ◽

1986 ◽

Vol 34 (3) ◽

pp. 474-478 ◽

Cited By ~ 43

Author(s):

Patrick J. Shea

Keyword(s):

Organic Matter ◽

Hydrogen Bonding ◽

Anion Exchange ◽

Exchange Resin ◽

Anion Exchange Resin ◽

Cation Exchange Resin ◽

Spectrophotometric Titration ◽

Silty Clay ◽

Solution Ph ◽

Strong Anion Exchange

The dissociation constant for chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino] carbonyl] benzenesulfonamide} in aqueous solution measured by spectrophotometric titration is 3.58 ± 0.05. Chlorsulfuron was more strongly adsorbed on IRA-400-Cl strong anion exchange resin than on IR-4B-OH weak anion exchange resin or Al2O3 anionotropic adsorbent. Hydrogen bonding was probably responsible for the adsorption observed on IR-120-Na(H) cation exchange resin. No chlorsulfuron was adsorbed on Al2O3 cationotropic absorbent, technical montmorillonite, illite, or kaolinite. Adsorption did occur on organic matter derived from a histosol. Chlorsulfuron was strongly adsorbed on activated charcoal but had little affinity for α-cellulose. Adsorption onto hydrophobic polymeric XAD-2 adsorbent at pH 5.2 was not significant for chlorsulfuron concentrations below 30 μM. No significant adsorption occurred on a variety of mineral soils low in organic matter. Adsorption on a Sharpsburg silty clay loam was inversely related to solution pH. Hydrogen bonding and charge transfer bonds were postulated as the major mechanisms responsible for chlorsulfuron adsorption in soil.

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