The Effect of Biomass (Chlorella vulgaris, Scenedesmus armatus) Concentrations on Zn 2+ , Pb 2+ and Cd 2+ Biosorption from Zinc Smelting Wastewater

Abstract

Non-modified and chemically modified algal biomass of Chlorella vulgaris and Scenedesmus armatus were chosen to examine their Zn 2+ , Pb 2+ and Cd 2+ sorption activity. The dry biomass was chemically modified with 1M HNO3 in order to determine the influence of acid--treatment on the heavy metal ions removal rate. The heavy metal uptake process was found to be rapid and very efficient. The sorption process of heavy metals is highly pH-dependent. It influences heavy metal forms in the solution, and functional groups located on the cell surface. The effectiveness of biosorption depends also on the biomass concentration and its modifications. The highest adsorption capacities of both, Chlorella vulgaris and Scenedesmus armatus towards zinc, lead and cadmium ions were found for the lowest sorbent concentrations. Batch experiments showed that the differences between uptake by non-modified and acid-modified biomass are relatively small. It can be due to the fact that non-modified algal biomass exhibits high sorption capacity.

Algal Biomass Utilization toward Circular Economy

“…Biosorption can be applied using different dry biomass types to remove metals in wastewater [ 47 ]. Microalgae cells have the potential to be utilized for heavy metal removal due to their ability to accumulate Hg, Cd, Zn, Au, Ag, Co, Mn, Cs, Ni, Fe, Cu, and Cr in their cells [ 44 , 48 ]. In addition, toxic metals such as Ni and Al can be removed from industrial wastewater by Spirulina platensis and Chlorella vulgaris strain.…”

Competence kinetic and thermodynamic studies between natural bio-adsorbent green microalgae and synthetic adsorbent magnetic nanoparticles for copper(II) ion in water

“…By increasing the metal ion concentration, the biosorption process is reduced the competitive dispersion of metal ions has risen at the sites available on the adsorbent surface at high concentrations; these pores are closed, and metal ions are prevented from going deep into the absorbent pores, implying that adsorption occurs exclusively on the surface, Putri and colleagues concluded that decline in adsorption, indicating saturation of all the binding sites on the algal surface [22]. The maximum adsorption capacities of Scenedesmus armatus and Chlorell avululgaris against zinc, Pb +2 , and Cd +2 ions were demonstrated by Zabochnicka-Witek and Ryga at the lowest sorbent concentrations [23]. pH is one of the most important parameters influencing the rate and strength of the initial adsorption.…”

Optymalizacja produkcji biomasy mikroglonów na cele energetyczne w przebiegu różnych sposobów odżywiania

“…Biomasa roślin wodnych, jak np. biomasa mikroglonów, może być z powodzeniem wykorzystywana do produkcji biopaliw ciekłych (biodiesel, bioetanol) lub gazowych (biogaz, biowodór), bądź może stanowić paliwo stałe wykorzystywane bezpośrednio do spalania [Zabochnicka-Świątek, Rygał 2017]. Kaloryczność lądowej biomasy roślinnej wynosi od 14 do 19 MJ/kg [Chrapka 2008], a kaloryczność biomasy mikroglonów jest wyższa i wynosi od 18 do 21 MJ/kg [Bei i in.…”