Study On The Adsorption Removal Of The Total Cyanide From Coking Wastewater With Resin

Using A/o (including A2/O2) biochemical process to treat coking wastewater cannot achieve the emission standards of the total cyanide concentration, which is0.3mg/L, in order to solve this problem, advanced treatment technology should be adopted for wastewater after biochemical treatment. This study adopts medium adsorption technology to adsorb the total cyanide, so that it can achieve the removal requirements of total cyanide both technologically and economically available.In this study,4adsorption mediums, including columnar activated carbon, coal-broken carbon, D001resin and717resin, are compared in the factors of the liquid air speed and adsorption efficiency of total cyanide, then select the717resin as the adsorbent for cyanide removal which shows the best adsorption efficiency. It is found that, under the circumstances of different influent concentrations and different liquid air speeds, the effluent concentration of total cyanide can drop to0.01-0.02mg/L when the influent concentration is1.2mg/L and the liquid air speed is10h-1. Meanwhile, regenerated research is carried on the saturated717resin. Further, static experiment of desorption under4different concentrations has also been studied and found the effect of the concentration and temperature of desorbent on the desorption efficiency. The conclusion is that the resin has the equivalent adsorption activity after2.5h desorption under normal atmospheric temperature when the desorbent is18%sodium chloride and1%sodium hydroxide.Tests prove that it can be used in the application of the reconstruction of wastewater treatment project to achieve the emission standards of total cyanide in coking wastewater.