Abstract
AbstractHigh salinity wastewater is characterized by high salt content, a large number of organic pollutants and difficulty in biochemical degradation, which has become a major problem in industrial wastewater treatment. In this article, the electrochemical oxidation technology was used to treat high salinity wastewater. The effects of temperature, current density, pH and additives on the removal effect of high salinity wastewater were investigated to optimize the process parameters. The results show that the best degradation effect is when the current density is 21.43 mA cm−2, pH = 2, the temperature is 60 °C, and electric field activates additional persulfate. After purification of high salt wastewater, the evaporated salt can be utilized as a resource. The industrial cost of degradation was estimated, and its economic benefits were calculated. This work will provide a theoretical and experimental basis for treating high salt wastewater by boron-doped diamond (BDD) electrochemical degradation technology.
Highlights
High salinity wastewater refers to the wastewater with a total salt content of more than 1%, containing a large amount of organic matter, organic heavy metals and radioactive substances (Lefebvre & Moletta )
The removal of organic pollutants from high salinity industrial wastewater is of vital importance to the ecological environment, and the purification of high salinity industrial wastewater will facilitate the recycling of resources
The electrochemical oxidation reaction mechanism is shown in Equations (1) and (2) (Enache et al ; Zhou et al ). Inorganic salts such as NaCl and Na2SO4 in salt-containing wastewater can be used as supporting electrolytes so that no additional additives are needed in the electrochemical oxidation process, which is conducive to resource-saving
Summary
High salinity wastewater refers to the wastewater with a total salt content of more than 1%, containing a large amount of organic matter, organic heavy metals and radioactive substances (Lefebvre & Moletta ). In this work, based on previous studies, the effect of the BDD electrode electrochemical oxidation degradation parameters (such as temperature, current density and initial pH) on the degradation of high salinity industrial wastewater is systematically studied.
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