The Application of a Surface Response Methodology in the Solar/UV-Induced Degradation of Dairy Wastewater Using Immobilized ZnO as a Semiconductor

Table 2

Physical-chemical results for dairy effluent before and after AOP treatment.

Parameters	Results		Percentage
	𝑖𝑛𝑛𝑎𝑡𝑢𝑟𝑎	After AOP
BOD5 (mg L^−1)	2218.7	1775	20
Chloride (mg L^−1)	793.5	526	33.7
Color (Pt Co)	6523.5	3260	50
N-NH3 (mg L^−1)	158.4	126.7	20
Oil and grease (mg L^−1)	2002.1	750	62.5
Phosphorus (mg L^−1)	208.5	156.4	25
TOC (mg L^−1)	1010	690	31.7
Total solids (mg L^−1)	10720	5886	45
Turbidity (NTU)	2786	1894	32
Zinc (mg L^−1)	5.0	5.0	—