Abstract
Waste biomass from γ-polyglutamic acid production was used as an adsorbent to remove Cr(VI) from wastewater. Waste biomass was entrapped in sodium alginate to enhance performance. Orthogonal array design was used to optimize biosorption of Cr(VI) by immobilized waste biomass. The optimal adsorption conditions for immobilized waste biomass were as follows: pH 7.0, initial Cr(VI) concentration of 200 mg/L, 35 °C, waste biomass of 2 g/L, 60 min. Under these conditions, the absorption efficiency of Cr(VI) was 96.38 ± 0.45%. When the waste biomass was treated with 1 mol/L HCl for 1 h, the desorption rate could reach 94.42 ± 0.87%. It was shown that the adsorption kinetics followed the Freundlich adsorption model, indicating that the adsorption of Cr(VI) by bacteria was mainly based on multi-molecular layer adsorption. The absorption conditions of waste biomass were mild (pH 6.0–7.5, 20–35 °C) and easily operated. These investigations lay a foundation for reducing the pollution of γ-polyglutamic acid production, turning the biomass waste into a useful adsorbent for wastewater treatment.
Highlights
Waste biomass from γ-polyglutamic acid production was used as an adsorbent to remove Cr(VI) from wastewater
With the increase of the demand and production of γ-PGA each year, a large number of waste biomass is produced, which is another source of pollution if discharge directly without proper processing[11]
Waste biomass is a byproduct of γ-PGA industry, and can drastically reduce treatment costs if it finds applications in the treatment of heavy metal-containing wastewater
Summary
Waste biomass from γ-polyglutamic acid production was used as an adsorbent to remove Cr(VI) from wastewater. The optimal adsorption conditions for immobilized waste biomass were as follows: pH 7.0, initial Cr(VI) concentration of 200 mg/L, 35 °C, waste biomass of 2 g/L, 60 min. The absorption conditions of waste biomass were mild (pH 6.0–7.5, 20–35 °C) and operated These investigations lay a foundation for reducing the pollution of γ-polyglutamic acid production, turning the biomass waste into a useful adsorbent for wastewater treatment. Chromium (Cr) is a prominent metal pollution in modern industrialized world as a result of the extensive application of this metal in a variety of industries including metallurgy, mining, electroplating, printing and dyeing industries[1] Wastewater discharged from these industries contain a significant amount of the hexavalent ionic form of this metal, which has attracted wide attention due to its toxicity, high carcinogenicity and mutagenicity[2]. With the increase of the demand and production of γ-PGA each year, a large number of waste biomass is produced, which is another source of pollution if discharge directly without proper processing[11]
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