The regeneration for reuse of nonylphenol (NP)-laden CNT was studied using electrochemical oxidation to completely mineralize the adsorbed NP to CO2 and water. Factors affecting the regeneration efficiency of CNT and the reusability of the bimetallic RuO2/Ti electrode were also studied. During CNT regeneration, electrochemical oxidation of the adsorbed NP was carried out using the bimetallic electrode operated at the potential gradient of 2 V/cm for 8 h in 150 mg/L of synthetic solution. Three electrolytes, i.e., 0.03-0.24 M of citric acid, 0.1-0.8 M of NaOH and 0.05-2 M of NaCl, respectively, were used in a glass cylindrical type of electrochemical cell. Three different types of electrodes, i.e., carbon, titanium, and RuO2/Ti (RT) were studied and compared. The NP removal efficiency of CNT in the citric acid, NaOH, and NaCl systems was 65.2-72.4, 65.8-71.7, and 64.0-80.5%, respectively. It was found that both CIO center dot and OH center dot radicals were responsible for NP degradation in the NaCl system; while OH center dot radical was the only oxidizing species in the other two electrolytes. Additionally, 58.8-69.5% of NP was degraded in the liquid phase at an estimated cost of ca. 50.67 USD per m(3) of water. The regenerated CNT could maintain a NP removal performance of 98.6% via adsorption. Bimetallic electrode and type of electrolyte are the key factors affecting the regeneration efficiency of CNT. It is concluded that the RT electrode should be a potential green technology for CNT regeneration in wastewater treatment. (C) 2017 Published by Elsevier B.V.