Optimization of SBBR Treatment of Ammonia Nitrogen in Municipal Wastewater Based on Response Surface Method
Sequencing batch biofilm reactor(SBBR)was used to treat urban simulated wastewater.The SBBR reactor was started by inoculation method.The effects of aeration time,C/N and filler dosage on the removal of ammonia nitrogen in SBBR reactor were studied.The response surface method was used to optimize the aeration time,C/N and filler dosage in the stable SBBR reactor,and the regression model was constructed and analyzed by variance.The results showed that when the biofilm was mature,the removal rates of COD and ammonia nitrogen in the effluent of SBBR system were stable at 88.1%and 85.2%,respectively.The single factor experimental analysis showed that the aeration time,C/N and filler dosage had a significant effect on the denitrification of the SBBR reactor,and the optimal values were 6 h,10 and 30%.After response surface optimization,the optimal operating point of the reactor was determined as follows:the filler dosage was 20.2%,the C/N was 10.5,and the aeration time was 6.4 h.The model predicted that the removal rate of COD was 95%and the removal rate of ammonia nitrogen was 94.14%.The model validation results showed that the COD removal rate was 92.72%and the ammonia nitrogen removal rate was 91.53%,which was less than 3%of the predicted value.Therefore,the model can truly reflect the influence of various factors on the removal rate of COD and ammonia nitrogen in simulated urban sewage.The response surface method can optimize the SBBR reactor to treat simulated urban sewage.
Sewage treatmentSBBRConstruction of microbial systemResponse surface optimization methodModel verification
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