Research On Removal Of Ammonia-nitrogen From Stripping Wastewater In A Methanol Plant By Exchange Resins

Water shortage, a serious issue, is widely concerned all around the world. Wastewater recycling is considered to be an effective approach to effectively solve of water shortage and pollution. Therefore, how to achieve the reuse of wastewater is into a serious problem. According to wastewater quality, the stripping wastewater coming from a methanol plant, mainly consist of ammonia with a low conductivity, high pH value, and low-concentrated organic, had a high recycling value.The aim of this work was to study the treatment and reuse of the stripping wastewater coming from a methanol plant by ion exchange resin. Firstly, the iron exchange for removing ammonia was carried out in a batch reactor. The ammonia adsorption performance of 001*7 and D113 was investigated in the same experiment condition, respectively. Many factors have a close relationship with the ammonia adsorption capacity:with increasing resins dosage, the ammonia removal of these two resins increased, while the adsorption rate decreased. In a basic solution, a higher adsorption capacity was obtained for the two cation resins. The adsorption capacity of two cation resins was improved with increasing temperature, and two resins both had good regeneration efficiency. The column experiment showed that:the greater the water flow rate, the breakthrough time was shorter; the lower the filling height, the breakthrough time was shorter. In addition, the paper studied the adsorption isotherms, thermodynamics and kinetics of two resins. The result showed that the adsorption isotherm of the resins was close to the Langmuir adsorption model, kinetics is close to the kinetics pseudo-second equation, the ammonia adsorption on the two resins was spontaneous, an endothermic reaction with the increase of entropy. Compared of the above results, D113 with good performance was selected as experimental material. According to the water quality of the stripper wastewater, the process, involving positive column with mixed bed, was used to investigate the ammonia removal. It is concluded that the wastewater under the treatment in this method can be recycled.