Wicherhamomyces anomalus biofilm supported on wood husk for chromium wastewater treatment

Abstract

A Wickeramomyces anomalus biofilm supported on wood husk was used to remediate water bodies contaminated with chromium (Cr), in batch and open systems. The favorable adhesion ability of the chromium-resistant yeast strain on the wood husk was predicted by XDLVO theory and confirmed by environmental scanning electronic microscopy. The chromium decontamination was then optimized in a batch mode using a central composite design (CCD). Analysis of variance (ANOVA) showed a high coefficient of determination (R) value of 0.93-0.91 for Cr(VI) and total Cr removal, respectively, ensuring a satisfactory fitting of the second-order regression model to the experimental data. In batch system, the concentration of biomass exhibited the minimal effect on the process. An acidic pH of 3.72 and 5.48, an initial chromium concentration of 10 and 16.91 mg/L and a support dose of 6.95 and 8.20 g/L were optimal for Cr(VI) and total Cr removal, respectively. The breakthrough curves were determined in open system for different initial chromium concentrations. The study of glucose concentration effect on the yeast extracellular polymeric substances (EPS) production showed that a medium exempt of glucose allowed maximal EPS production and minimal chromium removal efficiency, while 20 g/L glucose concentration of presented the optimal condition for chromium removal.

Antimicrobial Characteristics of Untreated Wood: Towards a Hygienic Environment

“…This bonding is carried out by van der Waals, electrostatic and acid-base interactions, which depend on the physicochemical properties of the microbe and substrate, especially hydrophobicity, surface charge, and electron donor-electron acceptor properties [46]. Wood can Health serve as support material for biofilm formation of such microbes which use cellulose as nutrition for survival [47]. However, hygienically important microbes can show different results regarding their adhesion.…”

Pb(II)-phycoremediation mechanism using Scenedesmus obliquus: cells physicochemical properties and metabolomic profiling

“…Contact angle measurements : measurement of the contact angle of S. obliquus cells from the control and Pb(II)-doped medium was carried out at 25 °C as described by Asri et al. (2018) using a digital optical contact angle (Data Physics OCA 40), via the sessile drop method, using water, formamide, and diiodomethane ( Table 1 ).…”

Bioremoval mechanisms of azo dye Acid Red 14 using Wickerhamomyces anomalus yeast strain as a natural biosorbent

“…The measurement of the contact angle was carried out at 25 ºC as described by Asri et al [19], using a digital optical contact angle (Data Physics OCA 40), via the sessile drop method, by using water, formamide and diiodomethane (Table S1). Both the left and the right contact angles measurements of algal biomasses were automatically calculated from the digitalized image using SCA 20 software.…”