Performance of bleaching clays in dechlorophyllisation of microalgal oil: A comparative study

While clay has been extensively studied for its ability to remove chlorophyll from vegetable oil, its effects and suitability on microalgae oil have received far less attention. In this study, three different clay types are evaluated and compared for their ability to dechlorophyllise microalgae oil. The clays involved are kaolinite, Fuller’s earth and bentonite clay which are activated by acid treatment. Bentonite clay is found to remove chlorophyll effectively (76.04%) than kaolinite and Fuller’s earth due to the presence of porous materials that facilitate adsorption. Additionally, the conditions of high temperature (79.69%) and ultrasound treatment (84.24%) demonstrate satisfactory chlorophyll removal efficiency. Another promising finding is that chlorophyll can be adsorbed on the clays without affecting the lipid composition in the microalgae extract significantly. Spent bleaching clay disposal is a growing issue that poses an environmental burden. Reusing bleaching clay can lower expenses and increase oil recovery. In a single sequential run, using spent bentonite clay yields the outcomes comparable to those of virgin bentonite clay. This finding offers a useful green and environmentally friendly approach to remove chlorophyll from microalgae oil feedstock. [Display omitted] •Chlorophyll adsorption rate of kalininite, Fullers earth and bentonite were tested.•Porosity and surface area of adsorbents were related to chlorophyll adsorption.•Bentonite clay exhibited high efficiency (76.04%) in chlorophyll removal.•High temperature and ultrasound treatment were pronounced in chlorophyll removal.•Spent study clay can be reused in another cycle with efficiency of 70.35%.