【摘 要】
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A pilot scale experiment was conducted to evaluate the characteristics of nitrogen removal in a hybrid membrane bioreactor (HMBR) which was developed by introducing biofilm carriers into a conventiona
【机 构】
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School of Environmental Engineering,Xuzhou Institute of Technolgy,No.1 Fuchun Road,Xuzhou 221018,Chi
论文部分内容阅读
A pilot scale experiment was conducted to evaluate the characteristics of nitrogen removal in a hybrid membrane bioreactor (HMBR) which was developed by introducing biofilm carriers into a conventional membrane bioreactor (CMBR).During a long term operation,the HMBR performed well on organic,nitrogen and phosphorous removal.To be specific,the COD,NH4+-N,TN and TP removal rate in the HMBR was enhanced by 3.8%,4.2%,13.7% and 1.6% respectively,compared to the CMBR.The effluent TN in the CMBR ranged from 21 mg.L-1 to 33 mg.L-1,while it dropped to 15-24 mg.L-1 in the HMBR.Further investigation was conducted on the property of activated sludge such as biomass quantity,SVI,particle size distribution and sludge particle structure.Results showed that the activated sludge particle size in HMBR was increased by nearly 100%comparing with that in CMBR,and the sludge in HMBR was more compact,which means that the effect of simultaneous nitrification and denitrification (SND) can occur in the HMBR sludge easier.Like the sludge,the SND can also occur in the thick biofilm.As a result,the contribution of activated sludge and biofilm in HMBR to the enhancement of TN removal rate was 8% and 5.7% respectively.
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