Treatment of a wastewater from a galvanizing industry containing chromium(VI) and zinc(II) by liquid surfactant membranes technique

Coelho, Fabrício Eduardo Bortot; Oliveira, Vanesa S.; Araújo, Estêvão Magno Rodrigues; Balarini, Julio Cézar; Konzen, Cibele; Salum, Adriane; Miranda, Tânia Lúcia Santos

doi:10.1080/10934529.2020.1871268

Cited by 5 publications

(2 citation statements)

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“…Contact time of 60 minutes had been reported for Fe 2+ , Zn 2+ , Pb 2+ , and Mn 2+ removal fro m cassava wastewater [14]. It was reported by Coelho et al [19] observed removal efficiency of 95% and 70% for Cr 6+ and Zn 2+ , respectively from galvanized wastewater between a contact time of 3 to 30 minutes, after which there was slight reduction. Kumar et al [20] obtained maximu m removal efficiency of 72% at a contact time of 90 minutes, adsorbent dosage of 60 mg/L for Fe 2+ removal in galvanized wastewater.…”

Section: Effects Of Contact Timementioning

confidence: 81%

“…Several work had been carried out on the treatment or remediation of galvanized wastewater us ing various techniques. Liquid surfactant membrane technique was utilized to reduce Cr (VI) and Zn (II) from galvanized wastewater [19]. Coagulants and flocculants in a system of Jar-test have been used to remediate galvanized wastewater [5], these techniques are slow with large amounts of sludge production.…”

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confidence: 99%

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Remediation of Heavy Metals from Galvanic Wastewater Using Cow Bone Char as Low Cost Adsorbent

Olaoye

Ojoawo

Bamigbade

et al. 2021

IJEE

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The adhesion of metal ions from wastewater to surface of a material in an adsorption process had proven to be effective for remediation of wastewater before discharge. There is a growing demand to utilize alternative low-cost adsorbents for the removal of heavy metals from galvanic wastewater in most developing countries. Cow bones are cheap, readily available and can be sourced locally from slaughterhouses and abattoir. Therefore, their use as an alternative adsorbent for remediation of galvanic wastewater had to be assessed. In this study, the efficacy of cow bone char (CBC) was assessed for simultaneous heavy metal ions removal from real life galvanic wastewater in a competitive adsorption process. The galvanic wastewater was characterized using atomic adsorption spectrophotometry while the CBC was characterized using X-ray Fluorescence (XRF), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared (FTIR). Batch experiment was performed to determine the effect of adsorbent dose, contact time and agitation speed on the removal efficiency of heavy metal ions from the galvanized wastewater. The concentrations of Mn 2+ , Fe 2+ , Zn 2+ , Pb 2+ and Cr 2+ in the raw wastewater exceeded the WHO and EPA standards. The adsorbent revealed a significant distribution of well-developed porous, rough surfaces with cracks characterized by different functional groups for the efficient adsorption process. The optimum adsorbent dose for all the metal ions was 0.04 g/100 mL at an optimum contact time of 60 minutes except for Fe 2+ with optimum contact time of 20 minutes, and agitation speed of 150 rpm. The maximum metal removal efficiencies obtained for Mn 2+ , Fe 2+ , Zn 2+ , Pb 2+ and Cr 2 were 99.7%, 100%, 99%, 90% and 85% + , respectively. The average adsorption capacity for Mn 2+ , Fe 2+ , Zn 2+ , Pb 2+ and Cr 2+ were 0. 44 mg/g, 26.7 mg/g, 78.5 mg/g, 0.133 mg/g for and 10.36 mg/g, respectively. CBC offers efficient and cost-effective removal of selected metal ions from galvanized wastewater.

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Section: Effects Of Contact Timementioning

confidence: 81%

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confidence: 99%