화학공학소재연구정보센터
Korean Journal of Chemical Engineering, Vol.38, No.9, 1870-1879, September, 2021
Suspended membrane bioreactor with extracellular polymeric substances as reserve carbon source for low carbon to nitrogen ratio wastewater: Performance and microbial community composition
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A suspended membrane bioreactor (SMBR) was employed to treat low carbon to nitrogen (C/N) ratio wastewater. The suspended membranes amplified by Comamonas sp. YSF15 were collected to develop the SMBR, which showed excellent performance for nitrate (NO3 -) removal. The maximum nitrate removal efficiency of 95.22% was obtained at an initial nitrate concentration of 20mg L-1, HRT of 6 h, and C/N=2.5 : 1 (molar ratio). In addition, the polysaccharide (PS) and protein (PN) compositions of the soluble microbial products (SMP), extracellular polymeric substances (EPS) and the Fourier transform infrared (FTIR) spectra indicated that the suspended membrane utilized its SMP and EPS as reserve C source to achieve higher denitrification performance under the low C/N ratio. With the increase of pH, the generated SMP and EPS in SMBR continued to increase. The increase in PS content was significantly greater than that of PN, thus forming a suspended membrane with a certain mechanical strength. Highthroughput sequencing data indicated that Comamonas sp. YSF15 played a key role in effective nitrate removal by SMBR. It can adapt to a nutrient-deficient environment, especially low (C/N) ratio, and greatly increase in the late operation of the reactor.
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