Study On Epoxy Resin Wastewater Treatment By Biological And Hybrid Technologies

Nowadays, wastewater from industry is damaging the environment and affecting human health, however, some kinds of industrial wastewater are difficult to treat, especially that with high salinity and high organic compounds concentration, for example the epoxy resin wastewater, and so it's significant for this wastewater's effective treatment. In this paper, the treatment of epoxy resin wastewater has been investigated;especially focus on the epoxy resin watstewater after several times' washing during the production process, which is with lower salinity and lower organic compounds concentration compared to the first three times' washing wastwater. The work consists of the checking of biological treatment for epoxy resin wastewater with the load of 300t/d, the process design of the biological and hybrid technologies for this resin wastewater treatment with the load of 500t/d, the preliminary acclimatization of activated sludge in the anaerobic and aerobic way, and the comparative study of Fenton oxidation and ozone oxidation for this resin wastewater. At last, the character of biological treatment and catalytic oxidation of this epoxy resin wastwater has been determined. The headlines read as follows:Firstly, the process checking of biological treatment according to a chemical plant of Huangshan Mountains has been done, of which the setting has a load of 300t/d and the parameters checked are hydraulic residence time (HRT), temperature, pH, packing characteristic, and oxygen supply amount. The result shows that the main operating conditions of this setting meet the treatment requests indeed. If only the split flow wastewater with lower concentration is treated in biological way and the operating conditions are controlled strictly, this biological treatment setting will in stable operation after activated sludge acclimatization, and its' effluent will reach the discharge standard.Secondly, To complete the treatment load of 500t/d, rising from 300t/d, the process design of the biological and hybrid technologies for this resin wastewater treatment has been made, according to the principle that to make the improvement bymading most of the present setting of the plant. During the design, at first, to choose an effective pretreatment, which can reduce the burden of latter biological treatment, the comparative study of Fenton oxidation and ozone oxidation has been done. The optimization conditions are received by the experiments: (1) The optimized operating condition of Fenton oxidation is that: the concentration of F^C^is 0.165g/L, the mass concentration ratio of H2O2toFeSO4 *7H2O is 6.5:1, pH is controlled in the scale of 3-5, and the reaction holds about lh at the ordinary temperatures as well as with enough stir and sedimentation;(2) The optimum condition of ozone oxidation is that: the flux of ozone and oxygen mixed gas is 3~4L/h, pH of the wastewater maintains the primary value: 10.8, the reaction time is 30min at the ordinary temperatures. And the result of the treatment cost analisis shows that, with the same treatment cost, the CODcr removal of Fenton oxidation is above 25%, which is higher than ozone oxidation's 15%. Then, to intensify the aerobic treatment effect, a membrane bioreactor should be adopted instead of the sludge settling tank which is after the anaerobic and aerobic treatment. At last, the process route of the design is determined as follows: Fenton oxidation— hydrolysis acidulate—biological contact oxidation—membrane bioreactor. Then the design has been done based on the route, focus on the anaerobic biofilter, biological contact oxidation tank, and membane bioreacter accoding to the load of 500t/d, in addition, the parameter optimization of MBR has been done. All the above work of design determines the main process parameters respectively. The result shows that the integrated process will complete the treatment task of 500t/d with its' effluent reaching the discharge standard.Finally, the preliminary acclimatization of activated sludge in the anaerobic and aerobic way has been done on the job, and it turns out that the activated sludge will need a long period's acclimatization to become mature.