A novel method to harvest Chlorella sp. via low cost bioflocculant: Influence of temperature with kinetic and thermodynamic functions

•Low-cost bioflocculant based algal biomass harvesting.•Effect of different concentrations of bioflocculant on algal biomass.•Effect of temperature with optimized concentration on harvesting efficiency.•Kinetics and thermodynamic functions to support the experimental data. In this study, harvesting...

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Bibliographic Details
Published in:Bioresource technology 2017-02, Vol.225, p.84-89
Main Authors: Kothari, Richa, Pathak, Vinayak V., Pandey, Arya, Ahmad, Shamshad, Srivastava, Chandni, Tyagi, V.V.
Format: Article
Language:English
Subjects:
Bioflocculant
Biomass harvesting
Biotechnology - economics
Biotechnology - methods
Chlorella - chemistry
Chlorella - cytology
Chlorella - growth & development
Costs and Cost Analysis
Entropy
Flocculation
Kinetic models
Kinetics
Low-cost
Microscopy, Electron, Scanning
Spectrometry, X-Ray Emission
Temperature
Thermodynamic functions
Thermodynamics
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Summary:•Low-cost bioflocculant based algal biomass harvesting.•Effect of different concentrations of bioflocculant on algal biomass.•Effect of temperature with optimized concentration on harvesting efficiency.•Kinetics and thermodynamic functions to support the experimental data. In this study, harvesting efficiency (HE) of bioflocculant (egg shell) was observed with variation in flocculent concentrations (0–100mgL−1), temperature (30°C, 35°C 40°C, 45°C and 50°C) and variable contact time (0–50min). It was found maximum (≈95.6%) with 100mgL−1 bioflocculant concentration whereas influence of temperature was also observed with optimized concentration of bioflocculant (100mgL−1) at 40°C (≈98.1%) and 50°C (≈99.3%), in 30min of contact time. Significant changes in algal cell structures were also analyzed after exposure to various temperatures with microscopy, SEM (Scanning electron microscopy) and EDS (Energy dispersive X-ray spectroscopy) images with and without bioflocculant. The experimental data was found to be a good fit with pseudo-second order kinetic model. The thermodynamic functions such as ΔG (Gibbs free energy), ΔH (enthalpy), ΔS (entropy) were also determined. The negative value of ΔG and positive value of ΔH and ΔS shows the spontaneous and endothermic nature of flocculation process.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.11.050