Research On Modification Of Activated Carbon Particle Electrode And Its Application For Wastewater Containing Nitrogenous

With the quick development of chemical, petroleum and pharmaceutical industry, the dischargeof nitrogen-contained wastewater increased seriously. Those untreated wastewater exacerbated theeutrophication of water bodies badly. This article mainly discussed the modification of active carbonparticle electrode (ACPE) and its application on nitrogen-contained wastewater treatment. The effectof factors on nitrogen removal efficiency and the degradation mechanism on nitrogen-containedwastewater treated by ACPE was investigated.The ACPE surface modification and catalyst modification affected the ACPE electrochemicaloxidation capability greatly. The surface modification results showed that: the number of acidfunctional group increased by acid and oxidation treatment; alkaline and oxidation treatment werebeneficial to increase carboxylic content. After surface modification, ACPE was modified by catalyst.Some factors such as impregnation concentration, impregnation time, the calcination temperature andcalcination time on ACPE adsorption and electrochemical oxidation capability were investigated. Theresult indicated that: under this experimental condition, the optimal impregnation concentration was0.1mol/L; the calcination temperature below200℃or above400℃were not beneficial to improveACPE electrochemical oxidation capability.The modified ACPE was applied to treat wastewater containing ammonia nitrogen andmethylene blue respectively. The factors including cell voltage, different electrolyte, electrolyteconcentration hydrogen peroxide additive and the value of solution pH influenced the removal ofammonia nitrogen and methylene blue. The results showed that: when the plate distance was5cm, theamounts of ACPE were50g, and the current density was25mA/cm2, the removal of ammoniaantrogen wastewater was95%. When the electrobath voltage was10v, the electrolyte concentrationwas0.1mol/L, and the concentration of hydrogen peroxide was1%, the removal of CODCrand TN inmethylene blue wastewater was93.4%and79.8%respectively.Throughout the analysis of samples by UV–Vis, FT–IR and LC–MS–MS, the degradationmechanism of the degradation of simulating methylene blue has been studied. Decomposition ofmethylene blue was firstly initiated by the open chain reaction of N, S heterocycles, and then somenew substance such as substituted benzene or small organic molecular formed.