Research Article
Heterogeneous Photocatalytic Degradation of Dairy Wastewater Using Immobilized ZnO
Table 3
Physical-chemical results for dairy effluent before and after AOP treatment in a reaction time of 3 h.
| | Parameters | Results |
Percentage | | In natura | After AOP |
| | Actual color (Pt Co) | 6523.5 | 3261.8 | 49.9 | | Turbidity (NTU) | 2786 | 1919.6 | 31.1 | | pH | 4.36 | 7.55 | — | | Odor | Pungent | Odorless | — | | COD (mg L−1 O2) | 6032.5 | 4222.8 | 30 | | BOD5 (mg L−1 O2) | 2218.7 | 1819.3 | 18 | | BOD5/COD | 0.368 | 0.431 | — | | TOC (mg L−1) | 1010 | 692.9 | 31.4 | | Phosphorus (mg L−1) | 208.5 | 156.4 | 25 | | N-NH3 (mg L−1) | 158.4 | 126.7 | 20 | | N-organic (mg L−1) | 180.1 | 144.1 | 19.9 | | ST (mg L−1) | 10720 | 5896 | 55 | | Oil and grease (mg L−1) | 2002.1 | 801 | 60 | | Chlorine (mg L−1) | 793.5 | 536.7 | 32.4 | | Iron (mg L−1) | 91.53 | 61.8 | 32.5 | | Zinc (mg L−1) | 5.0 | 5.0 | — |
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