Granular activated carbon for removal of organic matter and turbidity from secondary wastewater

Hatt, J. W.; Germain, Eve; Judd, Simon

doi:10.2166/wst.2012.644

Cited by 33 publications

(14 citation statements)

References 22 publications

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“…Both granular-activated carbon and powder-activated carbon (PAC) can be employed for water purification. The various contaminants that have been removed from water using AC include lead [42,43], chromium [44], copper [45], cyanide [46], organic matter, and turbidity [47].…”

Section: Introductionmentioning

confidence: 99%

Effect of acid modification on adsorption of hexavalent chromium (Cr(VI)) from aqueous solution by activated carbon and carbon nanotubes

Ihsanullah

Al-Khaldi

Abu-Sharkh

et al. 2015

Desalination and Water Treatment

168

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A B S T R A C TThe present study addresses the application of raw and modified carbon nanotubes (CNTs) and activated carbon (AC) for the removal of hexavalent chromium (Cr(VI)) from aqueous solution. Surfaces of both the adsorbents were modified by acid treatment. Nitric acid was used to remove impurities and to introduce carboxylic functional groups on the surfaces of CNTs and AC. Raw and modified adsorbents (CNTs and AC) were characterized by scanning electron microscopy, Brunauer-Emmett-Teller surface area analysis, and thermogravimetric analysis. The influence of adsorbent dosage, contact time, agitation speed, and solution pH were evaluated on the Cr(VI) removal efficiency using batch adsorption experiments. The optimum pH for maximum adsorption of Cr(VI) was found to be 3 and 4 for AC and CNTs, respectively. Modified and raw AC were able to remove 99 and 92% of Cr(VI) ions, respectively, at 75 mg adsorbent dosage, agitation speed of 200 rpm, initial Cr(VI) concentration of 1 mg/L, contact time of 4 h, and solution pH 3, while the removal of Cr(VI) ions recorded maximum values of 87 and 80% for modified and raw CNTs under same treatment conditions. However, acid modification of CNTs was found to have no major effect on the percentage removal of Cr(VI) ions at low adsorbent dosage. Adsorption capacities of both the adsorbents were determined using batch adsorption experiments and experimental data were described by Langmuir and Freundlich adsorption isotherm models. However, Langmuir isotherm model was able to best describe the adsorption of Cr(VI) ions on raw and modified forms of CNTs and AC. Maximum adsorption capacity (q e ) was found to be 2.024 and 1.805 mg/g for raw and modified AC, while 1.021 and 0.964 mg/g for raw and modified CNTs.

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Section: Introductionmentioning

confidence: 99%

Effect of acid modification on adsorption of hexavalent chromium (Cr(VI)) from aqueous solution by activated carbon and carbon nanotubes

Ihsanullah

Al-Khaldi

Abu-Sharkh

et al. 2015

Desalination and Water Treatment

168

View full text Add to dashboard Cite

show abstract

“…Both granular activated carbon and powder activated carbon may be employed for water purification. The various contaminants that have been removed from water using AC include lead [16], chromium [17], copper [18], cyanide [19], organic matter and turbidity [20]. In addition to CNTs and AC, carbon nanofibres also have the ability to remove zinc from aqueous solution, but the removal efficiency is poor.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive removal of cadmium(II) ions from liquid phase using acid modified carbon-based adsorbents

Ihsanullah

Al-Khaldi

Abusharkh

et al. 2015

Journal of Molecular Liquids

229

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“…The GAC filtration is an efficient method for organic and turbidity removal from wastewaters (Metcalf & Eddy et al 2004;Hatt et al 2013) and has little or no effect over ammonium, nitrate, or phosphorus content of wastewaters (Metcalf & Eddy et al 2004, Table 11-2). However, adsorption via granular activated carbon is known as to be used for removal of heavy metal ions from wastewaters.…”

Section: Importance Of Wastewater Pre-treatmentmentioning

confidence: 99%

Stable wastewater treatment with Neochloris oleoabundans in a tubular photobioreactor

2019

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The potential of a wastewater treatment and biomass production process with the green microalgae Neochloris oleoabundans in a 45-L tubular photobioreactor was tested. In a stable and reliable alga-based process, wastewaters should undergo pre-treatment to remove colored substances. Our data show that further optimization steps may be required, such as adjustment of the N:P ratio and addition of essential metals. As a final result, parameters were established for a continuous-mode photobioreactor run with optimized wastewater for five times the hydraulic retention time (157 h) at the dry biomass concentration of 0.47 ± 0.03 g L −1 . During that period, 75% and 99.6% removal efficiencies for NH 4 + and PO 4 3− , respectively, were achieved.

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Granular activated carbon for removal of organic matter and turbidity from secondary wastewater

Cited by 33 publications

References 22 publications

Effect of acid modification on adsorption of hexavalent chromium (Cr(VI)) from aqueous solution by activated carbon and carbon nanotubes

Effect of acid modification on adsorption of hexavalent chromium (Cr(VI)) from aqueous solution by activated carbon and carbon nanotubes

Adsorptive removal of cadmium(II) ions from liquid phase using acid modified carbon-based adsorbents

Stable wastewater treatment with Neochloris oleoabundans in a tubular photobioreactor

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