The treatment of chromium tanning wastewater using natural marl

Authors: Jabari, Maher; Aqra, Fathi; Shahin, Safa; Khatib, Awni

Source: Chemical Speciation and Bioavailability, Volume 21, Number 3, August 2009 , pp. 185-191(7)

Publisher: Science Reviews 2000 Ltd

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Abstract:

The technical feasibility of removing chromium(III) from contaminated tannery wastewater by adsorption on naturally available marl, referred to as HEWAR in Palestine, has been investigated by batch experiments. The effects of various parameters on the percentage relative adsorption concentration were carried out by UV-vis spectrophotometry. Percentage relative concentration curves showed an increase with time until approaching a plateau (adsorption capacity). The adsorption capacity increased with the marl-to-liquid ratio, providing complete removal of chromium above 0.003 g mL⁻¹ accomplished within 7 hours, while the marl particles were kept in suspension by stirring. The adsorption capacity increased with pH above 5.0, and decreased below this value. One sample of marl can be used for adsorbing chromium from various batches of wastewater until the adsorption sites are full.

Keywords: CHROMIUM; TANNING; WASTEWATER; ADSORPTION; MARL

Document Type: Research article

DOI: http://dx.doi.org/10.3184/095422909X12473263943097

Publication date: 2009-08-01

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Chemical Speciation & Bioavailability covers a rapidly expanding area in environmental science.
Research on the interactions between the chemical forms and behaviour of toxic compounds and their subsequent biological uptake, metabolism and ecological fate involves many scientific fields. These studies are often published in discipline-specific journals, leading to inadequate review and information scatter. This situation hinders both the development of an international community of experienced colleagues and the open flow of information and discussion. Additionally, the importance of speciation and bioavailability research to the development of pollution law and control technologies is being increasingly appreciated by environmental regulatory agencies throughout the world.
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The treatment of chromium tanning wastewater using natural marl

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