Use of the Coenobial Green Algae Pseudopediastrum boryanum (Chlorophyceae) to Remove Hexavalent Chromium from Contaminated Aquatic Ecosystems and Industrial Wastewaters

Abstract

Abstract:The idea of using microorganisms, especially microalgae, as biosorbents of heavy metals deserves particular attention due to their natural biosorbent properties and the relatively simple and inexpensive methods of obtaining their biomass. The cosmopolitan microscopic green alga of the genus Pseudopediastrum is an example of an organism with the desired biosorption properties. The aim of the study was to assess the potential use the dry biomass of Ps. boryanum var. longicorne in the process of biosorption of chromium(VI) (Cr(VI)) ions from aqueous solutions. Biomass of microalgae was cultivated in the photobioreactor conditions (L-S2T2 medium, light intensity of 4000 lx, photoperiod 12L:12D). The biomass obtained was used for the biosorption of Cr(VI) ions from aqueous solution. The effect of pH (2-6), biosorbent concentration (0.5-2 g/L) and initial chromium concentration (10-100 mg/L) was examined. The highest removal of Cr(VI) ions (70%) was observed at pH 2, initial chromium concentration of 10 mg/L and a biomass concentration of 2 g/L. At this chromium concentration, the sorption capacity of the microalga was the lowest. The results indicated that the biomass of the Ps. boryanum is suitable for the development of efficient biosorbent for the removal of Cr(VI) from wastewater.

Utilization of Non-Living Microalgae Biomass from Two Different Strains for the Adsorptive Removal of Diclofenac from Water

“…Comparatively with research on the uptake of pharmaceuticals by growing microalgae in wastewater, the utilization of non-living microalgae biomass for the adsorptive removal of these pollutants is still in its early stages [12,13]. That is not the case of the well-known adsorption capacity of microalgae to remove other pollutants such as metals [14,15] or dyes [16]. Still, in the case of pharmaceuticals, a main advantage of the application of adsorption processes for their removal is that transformation products, which may be generated during treatments involving degradation [17,18], are not produced.…”

Bioprocessing strategies for cost-effective simultaneous removal of chromium and malachite green by marine alga Enteromorpha intestinalis

“…The numerous number of chromium ions was competing with the binding sites of the algal biomass 42 . Sutkowy and Klosowski 43 applied the alga Pseudopediastrum sp. as biosorpent of Cr (VI), they reported that the biosorption capacity when increasing of initial concentrations of the metal.…”

“…The maximum removal of the MG by Sargassum swartzii was obtained at pH 10 66 . According to the summarized data in Table 5 , the optimum pH, initial chromium concentrations and also initial adsorbent concentrations vary according to the algae types 40 , 43 – 45 , 48 , 49 , 67 – 70 . With an increase in pH, the number of negatively charged binding sites increases, which would attract more cations (positive charge) of heavy metals or basic dye (MG) 71 .…”

“… Adsorbent Initial chromium conc. (mg/L) Algal doses (g/L) pH Contact time Removal efficiency References Chlorella sorokiniana 100 – 7 24 h 99.6793% Husien et al 40 Pseudopediastrm boryanum 10 2 2 15 min 70% Sutkowy and Kłosowski 43 Filamentous algae 10 0.250 2 70 17.24 mg/g Kumar et al 44 Chlorella vulgaris 20 2.34 4.5 24 h 88.2% Ardila et al 45 Scenedesmus acutus 20 2 5.34 24 h 87.1% Ardila et al 45 Polysiphonia urceolata 250 4 2 60 min 170.6 mg/g Li et al 48 Chondrus ocellatus 250 4 2 40 min 113.4 mg/g Li et al 48 …”

Effect of culture medium on the growth of microscopic algae (Chlorophyceae) biomass showing biosorption potential: A case study Pseudopediastrum boryanum

“…). Similarly, Sutkowy and Kłosowski () used free biomass of one variety of Ps. boryanum , namely var.…”