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With the development of the petrochemical enterprise scale and increasingly stringent environmental regulations , the petrochemical wastewater treatment technology is more and more attention . In this paper, the breeding of new microbial the UBD bacteria , by to airlift three-phase circulating fluidized bed reactor and combined with embedding technique for efficient biodegradation of petrochemical wastewater immobilized . The effect of different petrochemical wastewater biodegradation first by direct dosing strains in intermittent conditions were investigated and compared with conventional adsorption approach . Dosing 500μL / L UBD bacteria concentration after 48h of continuous aeration of actual refinery wastewater COD reduced from 1321mg / L to 539 mg of / L , the removal rate of 59.2% ; petroleum degradation by 65.6mg / L to 5.0mg / L, with a degradation rate of 92.4% . The UBD bacteria , MTBE and DME and MTBE hybrid COD removal rate reached more than 90% . Secondly , using three-phase internal circulating fluidized - bed reactor and combined with immobilized and investigated the the petrochemical wastewater biodegradable results under continuous conditions . Determine the election UBD bacteria immobilized optimization of embedded particles of gel liquid formulations , PVA , SA , activated carbon , SiO2 mass fraction of 4 % , 1.5% , 1.5% , 1% ; combined with the effects of the degradation of COD and petroleum , fixed hydraulic retention time 15h , the gas velocity of 180L / h, the solid holdup 5% , the solid particle 3mm phase fluidized bed to optimize the degradation process conditions, MTBE and DME and MTBE mixed wastewater treated under this condition , COD removal rate reached 88.5% and 87.9% , respectively ; deal with Sinopec Shanghai Gaoqiao Company refinery wastewater , COD degradation by 624mg / L to 93.6mg / L , the removal rate of 85.0% ; petroleum degradation by 48.7mg / L to 2.4 mg / L, the removal rate of 95.7% , the quality of treated water reached the national wastewater discharge level emission standards . This article also investigated hydrodynamic characteristics of a three - phase fluidized bed in the optimal operating conditions , the gas containing rate was 8.13% , liquid circulation time, 9S , complete liquid mixing time was 36S , the volumetric oxygen transfer coefficient was 20.5min-1 . Finally , the paper screened the UBD bacteria optimized medium formulation : peptone, yeast extract , sodium chloride content of 18 g / L , 5 g / L , 10g / L . UBD bacteria shocks culture conditions at 30 ° C , 190 rpm thermostat expanding culture of bacteria ensure follow - up experiment .
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