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This paper investigated the enhancement of nitrate removal by micro-electrolysis using Fe⁰ and surfactant modified activated carbon (ACs). Effects of various parameters such as AC types, Fe⁰ to ACs mass ratio, initial pH and initial DO concentration were studied. The results indicate that the application of hexadecyltrimethylammonium chloride (CTAC) modified ACs is an alternative path to achieve higher nitrate removal even at neutral and basic pH conditions, while the most suitable AC is the AC modified by 25 mmol/L of cationic surfactant CTAC. Final removal of nitrate is increased with the Fe⁰ to AC mass ratio increasing from 1:1 to 3:1, and further increase of the mass ratio results a decline of the removal. pH is found to be a key parameter affecting micro-electrolysis, and it is found that the nitrate removal declines with pH increase, and an accepted removal about 72.0% can be observed at neutral and 58.0% at …