生物流化床中附着生物浓度与生物膜厚度的关联式研究?
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摘要
附着生物浓度是衡量生物流化床效率的重要参数之一,研究通过理论推导和实验数据检验,证明了附着生物浓度与生物膜厚度关联的可行性。研究结果表明:生物膜厚度是关联附着生物量和流态化床层膨胀特性的重要参数;对于以形状规则尺寸均匀的微重颗粒作为生物载体,在壁面效应可忽略的生物流化床中,附着生物量、堆积床层膨胀率、流化曲线的斜率和截距都可以跟生物膜厚度及其相关参数进行线性关联,研究考察对象的关联式分别为m=0.154 9δ+0.161 8,ε0=0.005 5δ+1.128 1,n=0.028 9δ+1.212 6,logut=?7.370 6logdp+27.148,以上关联式中δ> 5μm。因此,附着生物浓度可表达为以生物膜厚度和表观液速为变量的函数,理解生物膜厚度和操作液速对附着生物浓度的影响规律,有利于实现生物流化床的稳定控制。
Attached biomass concentration is an important parameter that determines fluidized bioreactor efficiency. The feasibility of correlating attached biomass concentration and biofilm thickness was confirmed via empirical equations and experimental verification. The results indicate that biofilm thickness is an important parameter that correlates with biomass attachment and fluidized bed expansion. In a fluidized bioreactor with negligible wall effects and containing regular slight-heavy particles as bio-carriers, biomass attachment, bed expansion, fluidization-pressure drop curve can all linearly correlated with biofilm thickness as: m= 0.154 9δ + 0.161 8, ε0 = 0.005 5δ +1.128 1, n = 0.028 9δ +1.212 6 and logut = ?7.370 6 logdp + 27.148 when δ > 5 μm. The attached biomass concentration can be expressed as a function of biofilm thickness and superficial liquid velocity, which helps to understand the effect of biomass thickness and operating liquid velocity on biomass concentration. The results are beneficial for stable operation of fluidized bioreactors.
Attached biomass concentration is an important parameter that determines fluidized bioreactor efficiency. The feasibility of correlating attached biomass concentration and biofilm thickness was confirmed via empirical equations and experimental verification. The results indicate that biofilm thickness is an important parameter that correlates with biomass attachment and fluidized bed expansion. In a fluidized bioreactor with negligible wall effects and containing regular slight-heavy particles as bio-carriers, biomass attachment, bed expansion, fluidization-pressure drop curve can all linearly correlated with biofilm thickness as: m= 0.154 9δ + 0.161 8, ε0 = 0.005 5δ +1.128 1, n = 0.028 9δ +1.212 6 and logut = ?7.370 6 logdp + 27.148 when δ > 5 μm. The attached biomass concentration can be expressed as a function of biofilm thickness and superficial liquid velocity, which helps to understand the effect of biomass thickness and operating liquid velocity on biomass concentration. The results are beneficial for stable operation of fluidized bioreactors.
引文
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[2]施汉昌,温沁雪,白雪.污水处理好氧生物流化床的原理与应用[M].北京:科学出版社,2012.SHI H C,WEN Q X,BAI X.Principle and application of aerobic fluidized bioreactor for wastewater treatment[M].Beijing:Science Press,2012.
[3]王荣昌,肖帆,赵建夫.生物膜厚度对膜曝气生物膜反应器硝化性能的影响[J].高校化学工程学报,2015,29(1):151-158.WANG R C,XIAO F,ZHAO J F.Effects of biofilm thickness on nitrification performance of membrane-aerated biofilm reactors[J].Journal of Chemical Engineering of Chinese Universities,2015,29(1):151-158.
[4]TORRESI E,FOWLER S J,POLESEL F,et al.Biofilm thickness influences biodiversity in nitrifying MBBRs-implications on micropollutant removal[J].Environmental Science&Technology,2016,50(17):9279-9288.
[5]李平,吴海珍,韦朝海.生物流化床反应器生物膜特性研究进展[J].环境污染治理技术与设备,2002,3(9):75-79.LI P,WU H Z,WEI C H.The progress on the research of biofilm characteristics in biological fluidized bed[J].Techniques and Equipment for Environmental Pollution Control,2002,3(9):75-79.
[6]原文凯.三相内循环流化床反应器处理校园生活污水研究[D].兰州:兰州理工大学,2016.YUAN W K.Study on the campus sewage treatment with three-phase circulation integrate biological fluidized bed[D].Lanzhou:Lanzhou university of technology,2016.
[7]杨静,庄伟,吴菁岚,等.丙酮丁醇梭菌生物膜结构与组成分析[J].高校化学工程学报,2017,31(1):111-118.YANG J,ZHUANG W,WU J L,et al.Structure and composition analysis of clostridium acetobutylicum biofilm[J].Journal of Chemical Engineering of Chinese Universities,2017,31(1):111-118.
[8]赵庆良,刘淑彦,王琨.复合式生物膜反应器中生物膜量、厚度及活性[J].哈尔滨建筑大学学报,1999,32(6):39-43.ZHAO Q L,LIU S Y,WANG K.Biomass,thickness and activity of biofilm in hybrid biofilm reactors[J].Journal of Harbin University of C.E.&Architecture,1999,32(6):39-43.
[9]RUI A B,ALíRIO E R.Consecutive reactions in fluidized-bed biological reactors modeling and experimental study of wastewater denitrification[J].Chemical Engineering Science,1998,43(10):2715-2728.
[10]RICHARDSON J F,ZAKI W N.Sedimentation and fluidisation.Part I[J].Chemical Engineering Research&Design,1997,75(1):S82-S100.
[11]HERMANOWICZ S W,CHENG Y W.Biological fluidized bed reactor:hydrodynamics,biomass distribution and performance[J].Water Science&Technology,1990,22(1):193-202.
[12]杨平,郭勇,石炎福.生物流化床多孔生物颗粒沉降性能及床层膨胀特性研究[J].化学反应工程与工艺,2003,19(1):89-96.YANG P,GUO Y,SHI Y F.Porous bio-particles settling and bed expansion characteristics of fluidized-bed biological reactor treatment wastewater systems[J].Chemical Reaction Engineering and Technology,2003,19(1):89-96.
[13]NGIAN K F,MARTIN W R B.Bed expansion characteristics of liquid fluidized particles with attached microbial growth[J].Biotechnology and Bioengineering.1980,22(9):1843-1856.
[14]MULCAHY L T,SHIEH W K.Fluidization and reactor biomass characteristics of the denitrification fluidized bed biofilm reactor[J].Water Research.1987,21(4):451-458.
[15]严义忠,彭成中.生物膜颗粒下流液固流化床流化特性[J].石油化工,1989,18(12):829-834.YAN Y Z,PENG C Z.Fluidization characteristics of biological downflow liquid-solid fluidized bed[J].Petrochemical Technology,1989,18(12):829-834.
[16]潘涛,邬扬善,王绍堂.三相生物流化床膨胀特性方程的研究[J].环境科学,1997,18(3):34-37.PAN T,WU Y S,WANG S T.Study on the formula of expansion characteristic of three-phase biological fluidized bed[J].Environmental Science,1997,18(3):34-37.
[17]SARAVANAN V,SREEKRISHNAN T R.Hydrodynamic study of biogranules obtained from an anaerobic hybrid reactor[J].Biotechnology and Bioengineering,2005,91(6):715-721.
[18]KARAMANEV D G,NIKOLOV L N.Bed expansion of liquid-solid inverse fluidization[J].AIChE Journal,2010,38(12):1916-1922.
[19]GARCíA-CALDERóN D,BUFFIèRE P,MOLETTA R,et al.Influence of biomass accumulation on bed expansion characteristics of a down-flow anaerobic fluidized-bed reactor[J].Biotechnology&Bioengineering.1998,57(2):136-144.
[20]国家环境保护总局.水和废水监测分析方法[M].北京:中国环境科学出版社,2002.State Environmental Protection Administration of China.Monitoring and analysis method of water and wastewater[M].Beijing:China Environmental Science Press,2002.
[21]PATEL A,NAKHLA G,ZHU J X.Detachment of multi species biofilm in circulating fluidized bed bioreactor[J].Biotechnology and Bioengineering,2005,92(4):427-437.
[22]LI M,NAKHLA G,ZHU J.Impact of worm predation on pseudo-steady-state of the circulating fluidized bed biofilm reactor[J].Bioresource Technology,2013,128:281-289.