Exploring the Potential of Green Microalgae-Based Phycoremediation Treated Wastewater for Sustainable Concrete Production

Table 2

The measurement of optical density (OD) or absorbance at wavelength (660 nm) using a UV–visible spectrophotometer.

S. no.	Day	Absorbance at 660 nm
1	0	0.062
2	3	0.18
3	6	0.30
4	9	0.46
5	12	0.69
6	15	0.85