Psychology

Chemistry

Materials science

Chromatography

Physics

Flocculation

Electrode

Voltage

Coagulation

Electrocoagulation

Quantum mechanics

Wastewater

Current (fluid)

Organic chemistry

Current density

Pulp and paper industry

Electrical engineering

Effluent

Response surface methodology

Environmental science

Physical chemistry

Layer (electronics)

Passivation

Environmental engineering

Adsorption

Direct current

Psychiatry

Engineering

Composite material

Journal of Environmental Management

Cr(IV) pollution in water leads to serious environmental contamination and health risks. Among various wastewater treating methods, electrocoagulation (EC) is widely applied because of its high efficiency. However, there is still a problem of high energy consumption that has to be solved by direct current coagulation (DCC). In this paper, a sinusoidal alternating current coagulation (SACC) technique was used to reduce energy consumption and improve the efficiency of Cr(VI) removal. The effects of pH value, current density, initial concentration of Cr(VI) and reaction time are studied on the removal of Cr(VI). The response surface methodology (RSM) was used to optimize the parameters of SACC process. Compared with pulse direct current coagulation (PDCC) and DCC, SACC can greatly reduce the concentration polarization and prevent Fe electrodes from passivation so as to reduce energy consumption and improve the efficiency of Cr(VI) removal. When pH 5.6 wastewater containing 33.1 mg⋅dm-3 Cr(VI) was treated by appl...

Study on highly efficient Cr(VI) removal from wastewater by sinusoidal alternating current coagulation