Heterogeneous Photocatalytic Degradation of Dairy Wastewater Using Immobilized ZnO

Table 6

Equivalent value related to the cost of 3 h of ZnO photoirradiated reaction.

Equipment and reagents	Quantity used (3 h)*	Cost for the process (3 h) (US$)*
Pump energy consumption (kW-h)	0.0287	0.008323***
Reagents; H2SO4 + NaOH (g)	0.02	0.0008105**
Total cost:		0.0164

*US$ 1,00 = R$ 1.71; Cotações UOL.
**Quote N° 212712 from Labsynth Produtos of Laboratórios Ltda.
***1 kW-h = US$ 0.29; the third most expensive electricity in Brazil—Portal Business Brasil.