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Influence of MBBR carrier geometrical properties and biofilm thickness restraint on biofilm properties,effluent particle size distribution,settling velocity distribution,and settling behaviour

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Journal of Environmental Sciences 2022年第12期34卷 138-149页

作者： Raheleh Arabgol Peter A.Vanrolleghem Robert Delatolla Department of Civil Engineering University of Ottawa161 Louis PasteurK1N 6N5 ONCanada ModelEAU Département de génie civil et de génie des eauxUniversitéLaval1065 av.de la MédecineQuébecCanada

The relatively poor settling characteristics of particles produced in moving bed biofilm reactor(MBBR)outline the importance of developing a fundamental understanding of the characterization and settleability of MBBR-produced *** influence of carrier geometric properties and different levels of biofilm thickness on biofilm characteristics,solids production,particle size distribution(PSD),and particle settling velocity distribution(PSVD)is evaluated in this *** analytical Vi CAs method is applied to the MBBR effluent to assess the distribution of particle settling *** method is combined with microscopy imaging to relate particle size distribution to settling *** conventionally loaded MBBR systems are studied at a similar loading rate of 6.0 g/(m^(2)·day)and with different carrier *** AnoxK^(TM)K5 carrier,a commonly used carrier,is compared to so-called thickness-restraint carriers,AnoxK^(TM)Z-carriers that are newly designed carriers to limit the biofilm ***,two levels of biofilm thickness,200μm and 400μm,are studied using AnoxK^(TM)Z-200 and Z-400 *** analysis confirms that K5 carriers demonstrated a significantly different biofilm mass,thickness,and density,in addition to distinct trends in PSD and PSVD in comparison with ***,in comparison of thickness-restraint carriers,Z-200 carrier results did not vary significantly compared to the Z-400 *** K5 carriers showed the lowest production of suspended solids(0.7±0.3 gTSS/day),thickest biofilm(281.1±8.7μm)and lowest biofilm density(65.0±1.5 kg/m^(3)).The K5 effluent solids also showed enhanced settling behaviour,consisting of larger particles with faster settling velocities.

关键词： MBBR Particle size distribution(PSD) Particle settling velocity distribution(PSVD) settling behaviour ViCAs z-carriers

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