| New combination process,physical adsorption,chemical oxidation and biological integrated process,was set-up in lab-scale to treat the industrial parasteric ester production wastewater.To evaluate the feasibility and treatment characteristics of activated carbon fixed bed reactor,physical and chemical indexes?e.g.COD,salinity?were analyzed.Then Biological Contact Oxidation Reactor?BCOR?and a new biological treatment technology,Vertical Tubular Biological Reactor?VTBR?,were used to treat the effluent generated by activated carbon regeneration system.Evaluation of two different bio-reactors was performed by pollution removal efficiency and operation characteristics.Meanwhile,advanced oxidation technology was used to treat the effluent from adsorbed process,and the organic removal efficiency of the influent by Fenton oxidation and NaClO3/Fenton synergistic oxidation technology was compared.The results of adsorption/desorption experiments of activated carbon fixed bed showed that activated carbon process was suitable for the treatment of high-salt wastewater,and the removal rate of organics is more than 95%.Although the adsorption of activated carbon on salt was over expectation,it made almost nonsense to biological treatment and chemical oxidation treatment subsequently.In addition,the amount of water produced by activated carbon process is reduced by about 5 times than that of influent dilution before direct biotreatment.The operating results of the two reactors under the same condition,both of BCOR and VTBR could treat the effluent from the regeneration process when two system were stable,the removal rate of organics could reach over 80%.but the performance of VTBR showed better than BCOR contrastively when COD of effluent below 6000 mg/L.The chemical oxidation process was used to treat adsorbed effluent and biotreatment effluent,the results revealed that Fenton reagent could not degrade the organic matter in the wastewater completely.However,when sodium chlorate and Fenton reagents were used in a synergistic oxidation reaction,it was found that the concentration of organic matter in the wastewater dramatically decreased below 500 mg/L,which facilitated the recycling of wastewater.The study above concluded that the physical adsorption,chemical oxidation and biological integrated process could effectively treat high-salt wastewater,in which activated carbon had better performance in organic matter and salt remove and reduced the amount of wastewater generated.VTBR performed better than BCOR in organic removal.The NaClO3/Fenton synergistic oxidation technology could treat the water well for further recycling.The combination process provides a new idea for the treatment of high-salt wastewater and has a reference value. |
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