A Study on Al(III) and Fe(II) Ions Sorption by Cattle Manure Vermicompost

Abstract

Cattle manure vermicompost has been used for the adsorption of Al(III) and Fe(II) from both synthetic solution and kaolin industry wastewater. The optimum conditions for Al(III) and Fe(II) adsorption at pH2 (natural pH of the wastewater) were particle size of ≤250µm, 1 g/10 mL adsorbent dose, contact time of 4 h, and temperature of 25°C. Langmuir and Freundlich adsorption isotherms fitted reasonably well in the experimental data, and their constants were evaluated, with R 2 values from 0.90 to 0.98. In synthetic solution, the maximum adsorption capacity of the vermicompost for Al(III) was 8.35 mg g −1 and for Fe(II) was 16.98 mg g −1 at 25°C when the vermicompost dose was 1 g 10 mL −1 , and the initial adjusted pH was 2. The batch adsorption studies of Al(III) and Fe(II) on vermicompost using kaolin wastewater have shown that the maximum adsorption capacities were 1.10 and 4.30 mg g −1 , respectively, at pH2. The thermodynamic parameter, the Gibbs free energy, was calculated for each system, and the negative values obtained confirm that the adsorption processes were spontaneous.

Vermicomposting: A sustainable tool for environmental equilibria

“…Vermicompost also removed Al 3+ and Fe 2+ from industrial wastewater with an increase in pH (Jordão et al, 2010).…”

“…The reduction of Cd 2+ , Cu 2+ , chromium (as Cr 2 O 7 2− ), Ni 2+ , and Zn 2+ from synthetic effluents was achieved by vermicompost application (Pereira et al., ). The values of retention were: Cu 2+ and Ni 2+ (6,000 mg kg −1 ); Cd 2+ and Zn 2+ (4,000 mg kg −1 ); Cr 2 O 7 2− and Zn 2+ (2,000 mg kg −1 ); and Ni 2+ (4,000 mg kg −1 ) (Jordão et al., ). For metallic cations retention in synthetic effluents, vermicomposts’ mass is sufficient for treatment and resolves the limitation of vermicompost related to the matrix.…”

“…This precipitation occurs due to the presence of anion (phosphates) in vermicompost (Duarte Zaragoza, Carrillo, & Gutierrez Castorena, ). Vermicompost also removed Al 3+ and Fe 2+ from industrial wastewater with an increase in pH (Jordão et al., ).…”

“…The reduction of Cd 2+ , Cu 2+ , chromium (as Cr 2 O 7 2− ), Ni 2+ , and Zn 2+ from synthetic effluents was achieved by vermicompost application (Pereira et al, 2014). The values of retention were: Cu 2+ and Ni 2+ (6,000 mg kg −1 ); Cd 2+ and Zn 2+ (4,000 mg kg −1 ); Cr 2 O 7 2− and Zn 2+ (2,000 mg kg −1 ); and Ni 2+ (4,000 mg kg −1 ) (Jordão et al, 2010).…”

Evaluation of Liquorice Glycyrrhiza Glabra L. Root Powder as a New Adsorbent in the Removal of Textile Dyes in Aqueous Medium.

“…(Maghri et al, 2012). In relation to the treatment of effluents the adsorbates are pollutants such as heavy metals (Jordão et al, 2010), pharmaceuticals (Ribeiro et al, 2016) text ile dyes (Pereira et al, 2009) and others (Amin et al, 2015). Adsorption using natural adsorbents has been one of the most studied due to considerable availab ility and low cost (Ramakrishna &Viraraghavan, 1997).…”