Can a spectrophotometer be used to measure organic wastewater in factory wastewater?

Yes. You can use it.
For example, in the case of food factory wastewater, it is possible to measure the concentration of organic substances such as BOD, COD, nitrogen and phosphorus. Answer the appropriate wavelength. (We cannot answer anything that is not in our data.)

In addition, the weight of the main body is about 8 kg, so it can be easily carried to the site.