Fig. 1

Microscopic image of Chlorella pyrenoidosa pre- and post-treatment: A SEM image of control at × 1000 magnification. B SEM image of the test sample at 200 mg/L concentration at × 1000 magnification. C Light microscopy of the control sample at 40 × . D Light microscopy of the test sample of 200 × at × 40 magnification respectively