Table 7 Operating cost components for the treatment of 16 L of wastewater secondary sludge.

From: Molecular and ionic-scale chemical mechanisms behind the role of nitrocyl group in the electrochemical removal of heavy metals from sludge

Items

Values

Unit

Used aqua regia

16

mL/L

Aluminum consumed

0.058

mg/L

Electrical energy consumed

6.45

Wh/L

Cost of aqua regia cost

0.16

USD/L

Cost of aluminum consumed

1.85

USD/kg

Cost of electric energy consumed

0.03

USD/kWh

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