A Preliminary Study on Formation Potential of Organochlorine Substitutes during Electrocatalytic Oxidation of High Salt Organic Wastewater
Electrocatalytic oxidation is suitable for treating high-salt organic wastewater such as membrane concentrate from pulp and paper wastewater reuse,but anions such as Cl-during electrocatalytic oxidation may produce adsorbable organic chlorides(AOX),and there are environmental risks of secondary pollution.In this study,sodium lignosulfonate was used as a simulated pollutant,and NaCl and NaHCO3 were used as electrolytes to investigate the transformation and degradation of the pollutant and its by-products organochlorine generation potential under the Pt-Ti system and boron doped diamond(BDD)system.Studies have shown that chloride ions facilitate the conversion and decolourisation of sodium lignosulphonate,but the difficulty of mineralisation of the intermediate chlorinated products hinders the sustained reduction of TOC,and the final concentration of adsorbable organohalogenides(AOX)is 50～70 mg/L.Therefore,when the application of electrocatalytic oxidation technology for high-salt organic wastewater is promoted,effective measures must be taken to achieve AOX source reduction and end treatment to avoid the potential risks.
salinity wastewaterelectrocatalytic oxidationBDDAOXpulping and papermaking
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