Removal of natural organic matter by ion exchange

Bolto, B.A.; Dixon, David R.; Eldridge, R. J.; King, Stephen P.; Linge, Kathryn L.

doi:10.1016/s0043-1354(02)00231-2

Cited by 234 publications

(140 citation statements)

References 19 publications

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“…3 A number of technologies are available to control and reduce the water pollution with dye contaminants. Among them are coagulation 4 , filtration 5 , ionexchange, 6 electrolysis, 7 advanced oxidation processes 8 , foam flotation, 9 etc. The removal of dyes in an economic way remains an important problem, although a number of systems have been developed using adsorption techniques.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Indolean

Burcă²,

Măicăneanu³

2017

ACSi

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The adsorption of malachite green (MG) from aqueous solution by waste green tea (WGT) biomass was investigated. A series of experiments in batch conditions were conducted in order to assess the MG removal on WGT, following adsorbent quantity and temperature influences. Maximum removal efficiency for untreated WGT was 89% (4 g biomass, 100 mL solution of 94 mg/L, 316 K). It was found that the adsorption of MG increased by increasing temperature from 296 to 316 K. Thermodynamic parameters (ΔH°, ΔS°, ΔG°) were calculated, and indicated that dye adsorption onto the studied biomass was endothermic and non-spontaneous. Six chemical treatments were tested (four acidic -H 3 PO 4 , H 2 SO 4 , HCl, and tartaric acid, one oxidant -H 2 O 2 , and one basic -NaOH) in order to study the chemical groups responsible for MG adsorption onto WGT biomass. The alkali and acidic treatments led to an increase of adsorption efficiency up to 92% and 95% (H 2 SO 4 ) respectively. The FTIR spectroscopy results emphasized the modifications of the biomass surface and how these are influencing the adsorption process.

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Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Indolean

Burcă²,

Măicăneanu³

2017

ACSi

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“…NOM in surface water can be removed by IEX, because the main part of NOM, humic, fulvic and organic acids, is negatively charged (Bolto et al, 2002;Cornelissen et al, 2008). IEX is a promising method for NOM removal, because empty bed contact times can be small and run times of IEX columns can be up to several weeks (van der Helm et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Natural organic matter removal by ion exchange at different positions in the drinking water treatment lane

Grefte

Dignum²,

Cornelissen

et al. 2013

Drink. Water Eng. Sci.

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Abstract. To guarantee a good water quality at the customers tap, natural organic matter (NOM) should be (partly) removed during drinking water treatment. The objective of this research was to improve the biological stability of the produced water by incorporating anion exchange (IEX) for NOM removal. Different placement positions of IEX in the treatment lane (IEX positioned before coagulation, before ozonation or after slow sand filtration) and two IEX configurations (MIEX ® and fluidized IEX (FIX)) were compared on water quality as well as costs. For this purpose the pre-treatment plant at Loenderveen and production plant Weesperkarspel of Waternet were used as a case study. Both, MIEX ® and FIX were able to remove NOM (mainly the HS fraction) to a high extent. NOM removal can be done efficiently before ozonation and after slow sand filtration. The biological stability, in terms of assimilable organic carbon, biofilm formation rate and dissolved organic carbon, was improved by incorporating IEX for NOM removal. The operational costs were assumed to be directly dependent of the NOM removal rate and determined the difference between the IEX positions. The total costs for IEX for the three positions were approximately equal (0.0631 € m −3 ), however the savings on following treatment processes caused a cost reduction for the IEX positions before coagulation and before ozonation compared to IEX positioned after slow sand filtration. IEX positioned before ozonation was most cost effective and improved the biological stability of the treated water.

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“…Equation (5) does not take into account linear losses, which should be calculated according to (2). Due to the use of a flexible hose, which when coiled was deformed due to its own mass and the mass of water, an equivalent diameter was calculated according to (6): Based on equation (6) the equivalent diameter of the pipeline was dz = 48.1mm.…”

Section:  (4)mentioning

confidence: 99%

“…This process aims to effectively remove organic substances [1,2], especially oxidation or disinfection by-product precursors (OBP/DPB) [3], whose formation potential is related to UV absorbance at 254 nm (UV254) [4]. Due to the very high variability in surface water content during the year, and the varying levels of contamination dependent on source location, it is important to ensure maximum coagulation effectiveness, which influences subsequent processes in the water treatment system and their effectiveness.…”

Section: Introductionmentioning

confidence: 99%

The influence of hydraulic conditions on coagulation process effectiveness

Sambor

Ferenc

2017

E3S Web Conf.

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Abstract. This paper presents the impact that small changes in the hydraulic installation between the flocculation chamber and the sedimentation tanks have on coagulation process effectiveness. This study has shown significant improvements in the parameters of the treated water. The research was conducted in two treatment systems: reference and test, in order to compare the changes that were introduced in the time period between January and May 2016. The hydraulic conditions between the flocculation chamber and the sedimentation tank were changed in the test system, leaving the reference system unchanged for comparative purposes. The height-wise positioning of the sedimentation tank relative to the flocculation chamber resulted in a formation of a cascade at the flocculation chamber drain at a height of 0.60m. Air was therefore introduced into the water, forming an air-water mixture, which disturbed the flow between the devices. It was found that floc transported by the pipeline was broken down, which hampered sedimentation in the sedimentation tank. This was confirmed by the analysis of chosen parameters from treated water. After changes in the hydraulic system, changes in water turbidity were noticed, indicating an increase in post-coagulation suspension separation effectiveness. Consequently, an increase in organic carbon removal was found relative to the reference system. This change influenced changes in UV254 absorbance to a much lesser extent.

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Removal of natural organic matter by ion exchange

Cited by 234 publications

References 19 publications

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

Natural organic matter removal by ion exchange at different positions in the drinking water treatment lane

The influence of hydraulic conditions on coagulation process effectiveness

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