Development the Economical Chemical Treatment Plant for Chromium Recovery From Tannery Waste Water

Badar, M.; Iqbal, Munawar; Batool, Fatima

doi:10.22161/ijeab/1.3.38

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…As can be seen in Table 1, TE presents a high Cr(III) value reaching 758 mg/L exceeding the Tunisian standards of discharges "NT 106.002" (≤ 0.1 ppm). This is due to the excessive use of Cr during the tanning step (Cassano et al 2001) and to the fact that only 60 to 70% of the Cr used is fixed by the skin (Badar et al 2016). Similar results were reported by Sahu et al (2007), stating that Cr concentrations in the tanning bath are generally in the range of 500 to 5000 mg/L.…”

Section: Tanning Effluent Characterizationsupporting

confidence: 78%

“…However, the problem with Cr tanning is that only Editorial responsibility: Samareh Mirkia. 60 to 70% of Cr salts react with the hides, meaning that 30 to 40% remain in the solid and liquid wastes (Badar et al 2016). Besides, during the tanning step 1-2 m 3 of effluents is produced per ton of hiding (Dixit et al 2015); therefore, it is considered as one of the most polluting steps in the leather-making process (Raghava Rao et al 2003).…”

Section: Introductionmentioning

confidence: 99%

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Box-Behnken approach for optimization of Cr(III) removal from a real tanning effluent using powdered marble

Boujelben

Ellouze

Aziz

et al. 2021

Int. J. Environ. Sci. Technol.

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During the tanning step, 30-40% of trivalent chromium remains in the solid and liquid wastes, generating highly polluted sewage. In this study, powdered marble was used as a low-cost adsorbent to remove trivalent chromium from a synthetic solution and a real tanning effluent. Batch adsorption experiments on powdered marble were performed. After incubation, samples were filtered and the uptake of chromium was determined. A 3-level Box-Behnken Design was used to study the combined effect of initial chromium concentration, pH values and adsorbent dose on the removal of trivalent chromium. The results showed that the maximum uptake (> 99%) was obtained at a chromium initial concentration of 0.758 g/L, pH = 5.0 and using 6% (w:v) of powdered marble. Adsorption isotherm was satisfactorily described by Langmuir model. The toxicity of the tanning effluent was examined before and after adsorption. Phytotoxicity (Lepidium sativum) assays revealed an improvement of the germination index rising from 0 to 35% before and after adsorption, respectively. Microtoxicity (Escherichia coli) assays showed a decrease in the growth inhibition percentage going from 100 to 31% following the adsorption experiment using raw tanning effluent. Desorption study indicated that nearly 45% of the adsorbed trivalent chromium was recovered using 4% (v:v) HCl. Overall, results showed that powdered marble is an effective and an economical alternative with great potential for trivalent chromium recovery.

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Section: Tanning Effluent Characterizationsupporting

confidence: 78%