Total control of chromium in tanneries – thermal decomposition of filtration cake from enzymatic hydrolysis of chrome shavings

Kocurek, Pavel; Kolomaznı́k, Karel; Bařinová, Michaela; Hendrych, Jiří

doi:10.1177/0734242x16680728

Cited by 11 publications

(5 citation statements)

References 27 publications

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“…The majority of the time, RO has been used to remove pollutants with a molecular weight in the range of 150-250 Dalton, such as soluble organics, color, nitrate, and lowconcentration dissolved solids [41,42]. In industry, dissolved contaminants can be removed using the RO process, particularly inorganic salts [43]. The applied pressure for RO is higher, ranging from 10-150 bar, compared to other filtering processes.…”

Section: Reverse Osmosis Processmentioning

confidence: 99%

Applications and Challenges of the Reverse Osmosis Membrane Process: A Review

Mohammed,

Sachit,

Al-Furaiji

2023

J. eng. sustain. dev.

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Reverse osmosis is one of the most prevalent methods of generating potable water owing to its low power usage, excellent rates of contaminant removal, simple design, large output capacity, and much cheaper initial and maintenance costs than comparable alternatives. In this review, the most important published research related to the reverse osmosis process was reviewed. It was found that the majority of reported studies were related to using the reverse osmosis process for water desalination and wastewater treatment. Research has proven that the reverse osmosis process is a very effective method for desalinating water and treating industrial effluent containing heavy metals, organics, and other pollutants. Fouling was found to be one of the greatest obstacles encountered by the reverse osmosis method in water treatment, which raises operating costs due to the need for frequent cleaning, reduces the membrane's lifespan, and reduces the permeate flux. In general, microfiltration/ultrafiltration pretreatment and backwashing were among the most effective strategies suggested by researchers to reduce fouling and ensure the longevity and proper operation of the system.

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Section: Reverse Osmosis Processmentioning

confidence: 99%

Applications and Challenges of the Reverse Osmosis Membrane Process: A Review

Mohammed,

Sachit,

Al-Furaiji

2023

J. eng. sustain. dev.

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“…The adsorbent was then removed from the solution using a permanent magnet (5 × 5 × 3 cm 3 , 300 mT). The amount of remaining Cr(VI) was measured by a UV spectrometer at 540 nm using the diphenylcarbazide method [24]. The adsorption capacity (q e , mg/g) and adsorption percentage (E e , %) were calculated via Equations (1) and (2):…”

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

Coupling of kenaf Biochar and Magnetic BiFeO3 onto Cross-Linked Chitosan for Enhancing Separation Performance and Cr(VI) Ions Removal Efficiency

Zhou

Xie

et al. 2020

IJERPH

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Cr(VI) contamination has posed great threat to both the ecosystem and human health for its carcinogenic and mutagenic nature. A highly effective adsorbent for the removal of Cr(VI) was prepared and its adsorption mechanism was thoroughly discussed in this study. In detail, magnetic BiFeO3 and kenaf biochar were loaded on cross-linked chitosan to obtain chitosan-kenaf biochar@BiFeO3 (CKB) for improving adsorption capacity towards Cr(VI). The adsorption process of Cr(VI) onto CKB was evaluated as a function of the pH, the existence of competing ions, the initial concentration of Cr(VI) and contact time. The results show that CKB exhibits the highest adsorption capacity under the optimal pH 2.0. The presence of competing ions such as Ca2+, NO3−, SO42−, and Cl− decreases the adsorption capacity; among them, Ca2+ and NO3− show the greatest hindrance. By studying the effect of initial Cr(VI) concentration on the adsorption capacity, it was found that CKB in the solution was enough to remove Cr(VI) for all treatments (10–200 mg/L). The adsorption experimental data were well fitted with pseudo-first-order model, suggesting that chemisorption is not the dominant rate-limiting step. Freundlich isotherm model can better explain the adsorption process, indicating a non-ideal adsorption towards Cr(VI) on a heterogeneous surface of CKB. A 25-1 Fractional Factorial Design (FFD) showed that pH and initial concentration of Cr(VI) have significant influence on Cr(VI) adsorption in our reaction system. In general, excellent adsorption efficiency of CKB indicates that it may be a good candidate for the remediation of Cr(VI)-contaminating wastewater.

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“…Paper [40] highlights the emerging body of knowledge and research on chromium minimization, recycling and/or reuse of chromium waste to make tanneries safer for people and more eco-friendly. A scheme for the total control of chromium in the leather industry was designed in paper [41]. Long et al [42] described a method for recovering Cr (VI) from tannery sludge and chrome-tanned leather shavings.…”

Section: Introductionmentioning

confidence: 99%

Production of Agglomerates, Composite Materials, and Seed Coatings from Tannery Waste as New Methods for Its Management

Ławińska

2021

Materials

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This paper presents methods for managing waste produced by the leather industry, including tanning shavings derived from chrome tanning technologies and collagen preparations. Shavings were classified according to their shape (in accordance with Zingg’s shape classification). The content of individual elements was determined, together with the content of volatile organic compounds. Two new products were developed as part of the completed works: agglomerates (methods of non-pressure granulation) and composite materials were produced on the basis of tanning shavings and mineral fillers. Young’s modulus values classify these composite materials in the group of polymers and certain materials from the group of elastomers. A method for seed coating (on the example of legumes and rape) was also developed using a disc granulator, including collagen preparations in one of the layers as a solution for preventing the effects of droughts (biostimulant). The analyses of selected properties of the new products confirm the wide possible application of waste shavings and collagen preparations in a circular economy, especially in the construction, packaging, and agricultural sectors.

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Total control of chromium in tanneries – thermal decomposition of filtration cake from enzymatic hydrolysis of chrome shavings

Cited by 11 publications

References 27 publications

Applications and Challenges of the Reverse Osmosis Membrane Process: A Review

Applications and Challenges of the Reverse Osmosis Membrane Process: A Review

Coupling of kenaf Biochar and Magnetic BiFeO3 onto Cross-Linked Chitosan for Enhancing Separation Performance and Cr(VI) Ions Removal Efficiency

Production of Agglomerates, Composite Materials, and Seed Coatings from Tannery Waste as New Methods for Its Management

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