Recovery and reuse of chromium from tannery wastewaters using <i>Turbinaria ornata</i> seaweed

Aravindhan, R.; Madhan, Balaraman; Rao, Jonnalagadda Raghava; Nair, Balachandran Unni

doi:10.1002/jctb.1119

Cited by 77 publications

(36 citation statements)

References 20 publications

(8 reference statements)

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“…engineering of the biochar) not only protonates the charged sites but also replaces the natural mix of ionic species present in the bio-mass with protons. It was found that seaweed treated with MgCl2 showed 73% of Cr(III) uptake in comparison to unmodified one (65%) (Aravindhan et al 2004). There were successful attempts to modify biochar with Fe (Hu et al 2015;Samsuri et al 2013) or Mg Usman et al 2013).…”

Section: Introductionmentioning

confidence: 94%

Effect of Modification with FeCl3 and MgCl2 on Adsorption Characteristics of Woody Biochar

Chemerys

Baltrėnaitė²

2017

Proccedings of 10th International Conference "Environmental Engineering"

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Abstract. Due to high specific surface area, well-developed porous structure and surface functionality biochar has a potential for being used as low-cost adsorbent for adsorption of organic and inorganic contaminants from aqueous solutions. Higher adsorption capacity and selectivity for metals could be further developed after modification of properties of biochar through physical ("designed biochar") and chemical ("engineered biochar") modification techniques. Wood waste of three types [aspen (Populus tremula L.), pine (Pinus sylvestris L.) and fir (Picea abies L.)] were selected to produce the biochar under slow pyrolysis conditions at 450 °C for 2 h with the heating rate of 10 °C/min. Mg and Fe-particles, acting as potential sorption sites for adsorption of metals, were added into the biochar through modification of the biochar with metal salts MgCl2 and FeCl3. The aim of the study was to investigate the effect of chemical modifications of woody biochar with MgCl2 and FeCl3 on the adsorption characteristics of the biochar. The engineered biochar with improved physico-chemical and sorptive properties was evaluated as potential adsorbent of metals from aqueous solutions. Such characteristics of the biochar, as density, porosity, pH, cation exchange capacity, electrical conductivity, moisture content, ash content, water holding capacity, total organic carbon were analyzed. Modifications followed by increasing of moisture and ash content. While carrying out the future adsorption experiment, significantly decreased pH and electrical conductivity of the engineered biochar should be taken into account. Increased cation exchange capacity of the engineered biochar promotes enhanced adsorption of metals.

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Section: Introductionmentioning

confidence: 94%

Effect of Modification with FeCl3 and MgCl2 on Adsorption Characteristics of Woody Biochar

Chemerys

Baltrėnaitė²

2017

Proccedings of 10th International Conference "Environmental Engineering"

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“…Omar et al [47] immobilized Enteromorpha torta biomass using calcium alginate and solutions of calcium chloride for the biosorption of Cesium-134 on packed column beads. Other authors used calcium or magnesium salts to improve rheological properties of the biomass by the crosslinking generated by calcium ions and the alginate ibers [2], and used this material to make columns beds [48][49][50][51][52]. Other procedures applied to seaweeds biomass to improve the material properties include protonation treatments with diferent acids: crosslinking with formaldehyde, glutaraldehyde, bis(ethenyl)sulfone, 1-chloro-2,3-epoxypropane and polyethylene imine [14,53], thermal treatment [54], and chemical modiications of functional groups, among others [55].…”

Section: Industrial Uses Of Seaweed Biomassmentioning

confidence: 99%

Metal Removal by Seaweed Biomass

Ortiz-Calderon¹,

Silva²,

Vásquez³

2017

Biomass Volume Estimation and Valorization for Energy

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Environmental metal pollution is a serious public problem, and it has become an issue leading to research in the eluent remediation area. Techniques involving biosorption processes have been found to be promising due to the low cost of nonliving biomaterials, which have the potential to adsorb metal ions from wastewaters. One of the most promising types of biomasses to be used as biosorbents is the seaweed biomass, particularly from brown algae. The biosorption capability of the seaweed biomass relies on their cell wall chemical composition, mainly composed of alginates and fucoidans, molecules with a high presence of functional groups that interact with metal ions. This book chapter focuses on the use of seaweed biomass for metal biosorption and the chemical basis underlying the process. The current state of the commercial status of biosorption technology based on seaweed biomass is presented. Examples of complementary uses of the algae biomass other than industrial wastewater cleaning processes are presented, and the potential reuse of the biomass after the biosorption focused on biofuel production is discussed.

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“…The BGA species were grown in their respective growth media under controlled conditions in a growth chamber at a temperature of 25 AE 38C and light intensity of 10 000 AE 2000 lux. After two weeks, the biomass was separated [51] from the media by centrifugation. The pellets were washed several times with distilled water to remove impurities or salts of the media, before being used for the studies.…”

Section: Algal Sourcementioning

confidence: 99%

Bioremediation of Tannery Effluents Using a Consortium of Blue–Green Algal Species

Shashirekha

Sridharan

Swamy

2011

CLEAN Soil Air Water

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Trivalent chromium in the form of basic chromium sulfate (BCS) is used for tanning hides/skins and is a strong pollutant of the soil and water bodies. Significant quantities of unutilized chemicals, such as sulfates, chlorides, are also discharged, contributing to high levels of total dissolved solids (TDS), biochemical oxygen demand (BOD), chemical oxygen demand (COD), etc. Though many treatment techniques are being practiced, biotechnological methods are gaining importance. Biosorption is recognized as a costeffective technology worldwide; one potential sorbent being blue-green algae (BGA), for treating metal-bearing effluents. This work studies the feasibility of using a species each of Spirulina, Oscillatoria, and Synechocystis, individually and as a consortium, as sorbents to remove Cr 3þ from a segregated stream, viz. exhaust chrome liquor (ECL) and synthetic BCS solution. The species studied were found to be effective in removing Cr 3þ considerably at varying concentrations, besides reducing sulfates, BOD, COD, etc. The results of ECL experiments were more encouraging than those for BCS solution. The kinetic data on Cr 3þ sorption onto algal biomass fit well into the pseudo-second order model. The equilibrium data were analyzed using the classic Langmuir and Freundlich isotherm models, yielding good fits. The results of the experiments indicate that algal consortia could be good alternatives to the conventional treatment methods for leather and other industrial wastewaters containing chromium.

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Recovery and reuse of chromium from tannery wastewaters using Turbinaria ornata seaweed

Cited by 77 publications

References 20 publications

Effect of Modification with FeCl3 and MgCl2 on Adsorption Characteristics of Woody Biochar

Effect of Modification with FeCl3 and MgCl2 on Adsorption Characteristics of Woody Biochar

Metal Removal by Seaweed Biomass

Bioremediation of Tannery Effluents Using a Consortium of Blue–Green Algal Species

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