A novel method to harvest Chlorella sp. via low cost bioflocculant: Influence of temperature with kinetic and thermodynamic functions. (February 2017)

• Record Type: Journal Article
• Authors: Kothari, Richa; Pathak, Vinayak V.; Pandey, Arya; Ahmad, Shamshad; Srivastava, Chandni; Tyagi, V.V.
• Is Part Of: Bioresource technology. Volume 225(2017)
• Page Start: 84
• Page End: 89
• Publication Date: 2017-02
• Subjects: Bioflocculant -- Low-cost -- Biomass harvesting -- Kinetic models -- Thermodynamic functions; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2016.11.050
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: 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. Abstract: In this study, harvesting efficiency (HE) of bioflocculant (egg shell) was observed with variation in flocculent concentrations (0–100 mg L −1 ), temperature (30 °C, 35 °C 40 °C, 45 °C and 50 °C) and variable contact time (0–50 min). It was found maximum (≈95.6%) with 100 mg L −1 bioflocculant concentration whereas influence of temperature was also observed with optimized concentration of bioflocculant (100 mg L −1 ) at 40 °C (≈98.1%) and 50 °C (≈99.3%), in 30 min 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.