Removal of chromium from tanning wastewater and its reuse

Mella, Bianca; Glanert, Ana Claudia C.; Gutterres, Mariliz

doi:10.1016/j.psep.2015.03.007

Cited by 90 publications

(34 citation statements)

References 25 publications

(22 reference statements)

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“…Thus Cr(VI) is carcinogenic to living organisms including humans, whereas trivalent state of chromium [Cr(III)] is nontoxic [3,4]. Industries such as petroleum refining, fiberboard, coal mine, chemical, dye, textile pulp mill, paint, and steel dispose of Cr(VI) together with phenols and dyes through their effluents [5,6]. Degradation of these combinations of pollutants is not an easy task without stronger oxidizing agents (KMnO 4 /H 2 O 2 ).…”

Section: Introductionmentioning

confidence: 99%

Competitive photo-degradation performance of ZnO modified bentonite clay in water containing both organic and inorganic contaminants

Sasikala

Nibila

Babitha

et al. 2019

Sustain Environ Res

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This study reports the activity difference of zinc oxide modified bentonite clay (Photo-Zn-Bent) photocatalyst when in contact with different environmentally toxic pollutants in a single component and bi-component pollutant systems. The layered structure of purified and swollen nano-bentonite clay (Bent) has tunable interlayer spacing to grow zinc oxide (ZnO) nanoparticles, thereby integrating the adsorbing nature of clay and semiconductor property of ZnO in one hierarchical structure. Initial adsorption studies using methylene blue (MB) showed that the adsorption capacity of Photo-Zn Bent is greater than Bent and ZnO. The photocatalytic pollutant degradation activity of Photo-Zn Bent is compared with ZnO using both single component and bi-component pollutant systems (MB, phenol, mixture of MB and phenol, mixture of phenol and Cr(VI)). We found that Photo-Zn Bent displayed 33% greater MB degradation rate compared to ZnO. Photodegradation efficiency of Photo-Zn-Bent considerably differs for inorganic-organic and organic-organic bicomponent pollutant systems. In bicomponent systems, photodegradation rate of phenol decreased to an extent of 88% in the presence of MB, and increased to 31% in the presence of Cr(VI). On the other hand, photodegradation rate of MB remains unaffected in the presence of phenol, but increased to 56% in the presence of Cr(VI). However, if used in bicomponent pollutant systems for simultaneous cycles, Photo-Zn Bent showed lesser activity after 3 cycles, which in turn gave further insight on to the decay of catalyst with respect to the nature of pollutants.

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Section: Introductionmentioning

confidence: 99%

Competitive photo-degradation performance of ZnO modified bentonite clay in water containing both organic and inorganic contaminants

Sasikala

Nibila

Babitha

et al. 2019

Sustain Environ Res

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“…However, there are some disadvantages during the electrochemical treatment of wastewater. For example, the Cr recovery with Fe electrode showed a dark coloration because of the iron [186]. Furthermore, the electrical energy was consumed by the electro-methods in the tannery wastewater treatment.…”

Section: Electrochemical and Electrocoagulationmentioning

confidence: 99%

Fractionational and structural characterization of lignin and its modification as biosorbents for efficient removal of chromium from wastewater: a review

Wang

Sun

2019

J Leather Sci Eng

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The removal of chromium (Cr) from wastewater by various adsorbents has been investigated. As compared with the commercial activated carbon, the biosorbents with inexpensive and high adsorption capacities are developed from lignocellulosic wastes. Lignin, existing in lignocellulosic biomass, is the second most abundant resource in nature. Recently, lignin-based bio-sorbents were served as an advanced novel material for the metal ions and dye adsorption from wastewater. It has showed several advantages in the wastewater treatments because of the lowcost, high adsorption capacity, easy recover, and possibility of metal recovery. In this review, the isolation of lignin from lignocellulosic biomass was summarized, and the structural characteristics of lignin were comparably analyzed. The modification of lignin was performed to obtain a large surface area, strong binding-site, and high and quick adsorption properties of lignin-based adsorption materials. The adsorption efficiency of Cr ions was found to be strongly dependent on the pH of the wastewater. To further illustrate the adsorption process, the structural changes and the interactions between the metal ions and the functional groups of the lignin-based biosorbents in the adsorption process should be further investigated. Once the cost-effective and high-efficiency modification techniques are developed, lignin-based adsorbents can be expected to be the most suitable alternatives for Cr ions removal from wastewater in industry.

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“…The literature indicates that normally only 255 kg of finished leather is produced by processing 1 ton of raw hides, where approximately 75% of the raw material is discarded in the form of collagen and flashing wastes [ 4 ]. In their work, the authors Mella et al [ 5 ] have shown that the processing of one metric ton of rawhide results in 200 kg of tanned leather, 190–350 kg of non-tanned waste, and 200–250 kg of tanned leather waste. The most concerning organic waste includes that rich in lipids, cellulose, and protein, with a high organic load and poorly biodegradable compounds added due to tanning technologies [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Obtaining Granules from Waste Tannery Shavings and Mineral Additives by Wet Pulp Granulation

et al. 2020

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This paper presents the results of research on the granulation process of leather industry waste, i.e., tanning shavings. It is economically justified to granulate this waste together with mineral additives that are useful in the processes of their further processing. Unfortunately, the granulation of raw, unsorted shavings does not obtain desired results due to their unusual properties. In this study, the possibilities of agglomeration of this waste were examined by a new method consisting of the production and then the granulation of wet pulp. During granulation, no additional binding liquid is added to the granulated bed. As part of this work, the specific surface of granulated shavings, the granulometric composition of the obtained agglomerates, and their strength parameters were determined. The use of a vibrating disc granulator, the addition of a water glass solution (in the pulp), dolomite, and gypsum made it possible to obtain durable, mechanically stable granules.

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Removal of chromium from tanning wastewater and its reuse

Cited by 90 publications

References 25 publications

Competitive photo-degradation performance of ZnO modified bentonite clay in water containing both organic and inorganic contaminants

Competitive photo-degradation performance of ZnO modified bentonite clay in water containing both organic and inorganic contaminants

Fractionational and structural characterization of lignin and its modification as biosorbents for efficient removal of chromium from wastewater: a review

Obtaining Granules from Waste Tannery Shavings and Mineral Additives by Wet Pulp Granulation

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