Biological Removal
of Zinc (II) by Fusarium solani under Different Modes of Operational Strategies:
A Comparative Study
Kant Madhur, Sen Mousumi and Dastidar Manisha Ghosh
Res. J. Chem. Environ.; Vol. 28(5); 93-99;
doi: https://doi.org/10.25303/285rjce093099; (2024)
Abstract
The goal of the current batch biosorption experiment was to determine how well Fusarium
solani (isolated from soil) resting cells could remove zinc (II) from aqueous solution.
With an increase in pH (up to pH 5.0) and an increase in initial zinc (II) concentration
of up to 500 mg/L, the specific zinc (II) removal increases. By increasing biomass
content from 2.5 to 5.5 g/L, the specific zinc (II) removal remained nearly constant.
The investigations also utilised resting cells from various growth stages and at
an initial zinc (II) concentration of 500 mg/L, the maximum specific zinc (II) uptake
(51.7 mg/g) was accomplished (36 h old). The comparison of the results revealed
that cells in a growing state (63.9 mg/g) can achieve the highest selective uptake.
Hence, the uptake of zinc(II) under various operational strategies was only done
with growing cells. The biological uptake of zinc (II) was then done in a fed batch
mode of operation using Fusarium solani growing cells. Increased volume pulse feeding
(IVPF) and constant volume pulse feeding (CVPF) were used to study the fed batch
process and the impacts of these operational methods on biological performance were
contrasted with those of a traditional batch process.
According to batch experiments, at pH 5.0 and an initial zinc (II) ion concentration
of 500 mg/l, the maximum specific zinc (II) removal was 63.9 mg/g. The maximal specific
zinc (II) removal in the IVPF process was determined to be 45.47 mg/g and 33.58
mg/g, but the values in the CVPF process were 33.12 mg/g and 22.59 mg/g respectively
for the first and second pulse feedings in both cases. The zinc (II) uptake found
in prior investigations carried out by the current authors employing the continuous
mode of operation was then compared with these results. The process could be run
for a longer period of time with a maximum specific zinc (II) removal of 52.8 mg/g
when operating in a continuous mode which was shown to be the optimal operational
strategy.
