Textile Wastewater Treatment With Activated Sludge And Powdered Activated Carbon

Yeh, Ruth Yu‐Li; Hung, Yung Tse; Liu, Robert Lian Huey; Chiu, Hui Mei; Thomas, Adrian

doi:10.1080/00207230212735

Cited by 22 publications

(3 citation statements)

References 3 publications

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“…1(b) shows that the amount of color removal increased from 77 to 96 percent with increase in dosage of adsorbent from 4 to 14 g/L for 1200 Pt-Co initial color concentration. These results are quite comparable to that using commercially available PAC as it was previously found that a COD removal of 88 to 98 percent could be obtained for low and medium strength textile wastewater with a PAC dose of 15 g/L (Yeh et al, 2002). The adsorbent dosage corresponding to 87% color removal (i.e.…”

Section: Effect Of Contact Time and Adsorbent Dosage On Color Removalsupporting

confidence: 74%

Color removal from textile wastewater using date seeds activated carbon

Rahman

Ahmed

Salehin

et al. 2017

Bangladesh J. Sci. Ind. Res.

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Powdered Activated Carbon (PAC) developed from date seeds was used as an adsorbent for the removal of color from textile wastewater. Batch adsorption experiments were performed in the laboratory with varying process parameters (temperature, pH, agitation, adsorbent dosage, particle size) over a range of contact periods and wastewater pollutant (color) levels. It was found that the removal mechanism could be better characterized by the Freundlich adsorption isotherm model compared to the Langmuir model. Also, The Lagergren's pseudo second order kinetic model fitted relatively well (R 2 = 0.99) over the selected range of contact times (5-60 minutes) and initial color concentrations (800-1200 Pt-Co unit) compared to the pseudo-first order model indicating that chemisorption may be playing a dominant role in the adsorption process. Both external film and intra-particle pore diffusion mechanism were involved in the adsorption process but film diffusion was found to be rate limiting. While analyzing the thermodynamics, the negative value of free energy (-1.83 to -3.4 KJ/mole), positive value of enthalpy (0.26 to 0.28 KJ/mole) and entropy (0.97 to 1.01 J/K/Mole) associated with the color removal mechanism indicated that adsorption was spontaneous and endothermic with increased disorder and randomness at the solid-liquid interface of the date seeds PAC. These experiments suggests that date seeds PAC is a very effective adsorbent, capable of removing a significant amount of color from industrial wastewater if process variables can be optimized and can be explored as a potential low-cost alternative to expensive tertiary treatment options.

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Section: Effect Of Contact Time and Adsorbent Dosage On Color Removalsupporting

confidence: 74%

Color removal from textile wastewater using date seeds activated carbon

Rahman

Ahmed

Salehin

et al. 2017

Bangladesh J. Sci. Ind. Res.

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“…Hence, the removal of these dyes from effluents through degradation into non-toxic components is of much importance to resolve the environmental problem. Conventional effluent treatment methods include precipitation, chemical oxidation, coagulation- flocculation, adsorption, filtration and reverse osmosis678. These methods require additional treatment and are not cost effective.…”

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confidence: 99%

A New Synergetic Nanocomposite for Dye Degradation in Dark and Light

Prasanna

Vijayaraghavan

2016

Sci Rep

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Environmental hazard caused due to the release of dyes in effluents is a concern in many countries. Among the various methods to combat this problem, Advanced Oxidation Process, in which semiconductor photocatalysts are used, is considered the most effective one. These materials release Reactive Oxygen Species (ROS) such as hydroxyl radical and superoxide in suspension that degrade the dyes into non-toxic minerals. However, this process requires visible or UV light for activation. Hence, there is a need to develop materials that release ROS, both in the absence and in the presence of light, so that the efficiency of dye removal is enhanced. Towards this objective, we have designed and synthesized a new nanocomposite ZnO2/polypyrrole which releases ROS even in the dark. The ROS released in the dark and in light were estimated by standard methods. It is to be noted that ZnO2 degrades the dye only under UV light but not in dark or in the presence of visible light. We propose the mechanism of dye degradation in dark and light. The synergically coupled nanocomposite of ZnO2/ppy is the first example that degrades dyes in the dark, through advanced oxidation process without employing additional reagents.

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“…Therefore, water pollution has become an increasingly serious concern. In recent years, adsorption approaches have been widely used to remove dyes from wastewater because of their high decolorization capacities . Several adsorbents such as activated carbon, sludge, fly ash, polymeric resins, and bentonite clay have been reported to be effective adsorbent materials for plenty of dyes. − However, high price or low regeneration ability is the shortcoming, restricting the usage of these materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Sodium Humate-Modified Biochar Absorbents for Water Treatment

Dou

Jiang

2019

ACS Omega

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Some chemical substances could improve the sorption capacity of biochars. In this paper, sodium humate was introduced to the pyrolysis of two biomass samples at 600 °C, and sodium humate–biochars have been successfully synthesized. The surface area and surface morphologies of all of the biochars were characterized, and the results indicated that sodium humate–biochars have higher surface areas, and sodium humate particles were grown on the surfaces of the biochars. Adsorption isotherm and kinetics of methylene blue (MB) onto the biochars were carried out by batch adsorption experiments. The results suggested that incorporation of sodium humate could increase the adsorption capacity of MB onto the biochars (from 10.79 to 16.21, 8.62 to 11.03 mg/g for peanut shells and white clover residues, respectively). The adsorption experimental results also suggest that the adsorption process of MB onto sodium humate–biochars is controlled by both intraparticle diffusion and film diffusion. As a whole, this work probes the possibility of sodium humate to modify the surface of biochar and improve its adsorption ability with contaminants.

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Textile Wastewater Treatment With Activated Sludge And Powdered Activated Carbon

Cited by 22 publications

References 3 publications

Color removal from textile wastewater using date seeds activated carbon

Color removal from textile wastewater using date seeds activated carbon

A New Synergetic Nanocomposite for Dye Degradation in Dark and Light

Preparation of Sodium Humate-Modified Biochar Absorbents for Water Treatment

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