Research On The RDT-8 Flame Retardant Producting Wastewate

2,4,6-Tris-(2,4,6-tribromophenoxy)-1,3,5-triazine is a kind of brominated flame retardants which has highly active and RDT-8 is short name for it. Many complicated composition of pollutants are produced in the process of its production such as tribromophenol and N, N-dimethylformamide (DMF). Centrifugal water distillation, bromide washing water and mixed wasterwater are produced in the process of product RDT-8 and they are the main objects in this study. Acid precipitation, macroporous resin absorption, activated carbon adsorption and other several methods are used to treat these wasterwater. Different treatments are used to study the removal efficiency of COD and tribromophenol in different wasterwater. According to the optimum conditions of test in the laboratory, the pilot-plant design and engineering design can get basis. Synthetic wastewater for DMF is also studied in this paper. Alkali hydrolysis, biochemical method and activated carbon adsorption are used to treat the DMF synthetic wasterwater. The result of the experiment and the optimum conditions can provide the basis to DMF wasterwater in the practical engineering.In the study, wasterwater from the the production process of RDT-8 is analysised about water quality. According to the water quality analysis, the composition of COD can be confirmed in the waster water. In this paper, physical, chemical and biological methods are used to treat the wasterwater. COD of wasterwater can meet the emission requirements of Shandong Peninsula River Basin Water Pollution Comprehensive Discharge Standard-100mg/L.For the centrifugal distillation water, using acidic precipitation and HZ-16 macroporous adsorption resin can achieve good results. The optimized experimental conditions for acidic precipitation is pH= 1.9. The optimized experimental conditions for macroporous adsorption resin is adsorption velocity= 4BV/h. The COD and tribromophenol have good removal efficiency after the treatment and COD of this wasterwater can drop below 100mg/L.For the bromide washing water, using acidic precipitation, HZ-16 macroporous adsorption resin and air oxidation can achieve good results. The optimized experimental conditions for acidic precipitation is pH= 2. HZ-16 macroporous adsorption resin has good performance on adsorption of tribromophenol and the air oxidation can remove part of COD in waaterwater, but COD of bromide washing water can’t achieve project goal. The bromide washing water need be treated with other wasterwater.For the RDT-8 mixed wasterwater, using acidic precipitation, HZ-16 macroporous adsorption resin, activated carbon adsorption and Fenton can achieve good results. The optimized experimental conditions for acidic precipitation is pH= 3. When the adsorption velocity of macroporous adsorption resin is 4BV/h, the effluent COD of macroporous adsorption resin has good removal after 250BV. The activated carbon adsorption can remove DMF after macroporous adsorption resin. The optimized experimental conditions for Fenton are pH=3,2 hours of reaction time, the dosage of FeSO4 · 7H2O= 6g/L and the dosage of 30% H2O2＝2mL/L.For artificial water of DMF, using biochemical method can achieve good result on removal of DMF. Alkaline hydrolysis also has good result and the optimized experimental condition for alkaline hydrolysis is the dosage of NaOH is 60g/L and gas water ratio is 180:1. Activated carbon adsorption can achieve good result on removal of DMF and the actibated carbon can be regenerated by hot air at 200℃ after saturation adsorption.