Performances of upflow anaerobic filters containing modular crossflow media and two types of media packed at random, and a non-packing anaerobic reactor were investigated to find out the optimum design and operational parameters, and the roles of media. Dairy wastewater as a feed was selected for es...
Performances of upflow anaerobic filters containing modular crossflow media and two types of media packed at random, and a non-packing anaerobic reactor were investigated to find out the optimum design and operational parameters, and the roles of media. Dairy wastewater as a feed was selected for estimating performance of anaerobic filters with high-strength organic loading. The packing volumes of modular crossflow media were 55%, 85%, and 27.5%+27.5% corresponding to total volume of 36.8L in relatively large laboratory-scale anaerobic filters capable of containing modular crossflow media suitable for use in full-scale reactors. Non packing anaerobic reactor as control reactor was operated for investigating the role of modular crossflow media. To select an optimum media, the performances of upflow anaerobic filters packed with ceramic-tube and pall-ring at random were compared with that of upflow anaerobic filter packed with modular crossflow media. Hydraulic retention time and media packing volume as the important design and performance parameters for anaerobic filters packed with modular crossflow media treating a dairy wastewater were identified by laboratory experiments and mathematical analyses. Media packing is essential for highly efficient anaerobic treatment. Important roles of media in upflow anaerobic filter were sludge accumulation and gas-liquid-solid separation efficiency. Modular crossflow media is relatively superior to other media in view of sludge accumulation, gas-liquid-solid separation, permissible loading rate, process efficiency and process stability. Media packed at random have structural defects which caused to clogging and entrapment of biogas, substrate transfer limitation, and irregular evolution of biogas leading to loss of solids and biomass. Especially, those defects were prominent with ceramic-tube. Organics removals of crossflow media anaerobic filters were maintained above 70% even at an organic loading rate of 12kgCOD/㎥/d. Organics removals were a little lower at 55% packing, because the modular crossflow media was too big for the laboratory-scale reactor. The control anaerobic reactor using only suspended microorganisms which was not packed with and media could not sustain suitable efficiency under the same organic loading rate. Alternative packing method with 27.5%+27.5% modified from 55% packing, of which configuration was to contain a certain space between crossflow module units, was effective to improve organics removals. The anaerobic filters packed with 55% and 85% packing achieved to the COD removal of 70% with the influent COD of 2,500mg/L, and could be applied to low-strength organic wastewater. Start-up behaviors of the anaerobic filters were different with nature of seeding materials. Supernatant from anaerobic digested sludge acclimated to dairy wastewater showed good performance as a seeding material. At the steady state, the anaerobic filters packed with modular crossflow media carried out stable performance even at the withdrawal of sludge seeded at the bottom of the reactor. Key Words : Upflow anaerobic filter, modular crossflow media, ceramic-tube, pall-ring, dairy wastewater, high rate organics removal, media packing volume, gas-liquid-solid separation, sludge retention
Performances of upflow anaerobic filters containing modular crossflow media and two types of media packed at random, and a non-packing anaerobic reactor were investigated to find out the optimum design and operational parameters, and the roles of media. Dairy wastewater as a feed was selected for estimating performance of anaerobic filters with high-strength organic loading. The packing volumes of modular crossflow media were 55%, 85%, and 27.5%+27.5% corresponding to total volume of 36.8L in relatively large laboratory-scale anaerobic filters capable of containing modular crossflow media suitable for use in full-scale reactors. Non packing anaerobic reactor as control reactor was operated for investigating the role of modular crossflow media. To select an optimum media, the performances of upflow anaerobic filters packed with ceramic-tube and pall-ring at random were compared with that of upflow anaerobic filter packed with modular crossflow media. Hydraulic retention time and media packing volume as the important design and performance parameters for anaerobic filters packed with modular crossflow media treating a dairy wastewater were identified by laboratory experiments and mathematical analyses. Media packing is essential for highly efficient anaerobic treatment. Important roles of media in upflow anaerobic filter were sludge accumulation and gas-liquid-solid separation efficiency. Modular crossflow media is relatively superior to other media in view of sludge accumulation, gas-liquid-solid separation, permissible loading rate, process efficiency and process stability. Media packed at random have structural defects which caused to clogging and entrapment of biogas, substrate transfer limitation, and irregular evolution of biogas leading to loss of solids and biomass. Especially, those defects were prominent with ceramic-tube. Organics removals of crossflow media anaerobic filters were maintained above 70% even at an organic loading rate of 12kgCOD/㎥/d. Organics removals were a little lower at 55% packing, because the modular crossflow media was too big for the laboratory-scale reactor. The control anaerobic reactor using only suspended microorganisms which was not packed with and media could not sustain suitable efficiency under the same organic loading rate. Alternative packing method with 27.5%+27.5% modified from 55% packing, of which configuration was to contain a certain space between crossflow module units, was effective to improve organics removals. The anaerobic filters packed with 55% and 85% packing achieved to the COD removal of 70% with the influent COD of 2,500mg/L, and could be applied to low-strength organic wastewater. Start-up behaviors of the anaerobic filters were different with nature of seeding materials. Supernatant from anaerobic digested sludge acclimated to dairy wastewater showed good performance as a seeding material. At the steady state, the anaerobic filters packed with modular crossflow media carried out stable performance even at the withdrawal of sludge seeded at the bottom of the reactor. Key Words : Upflow anaerobic filter, modular crossflow media, ceramic-tube, pall-ring, dairy wastewater, high rate organics removal, media packing volume, gas-liquid-solid separation, sludge retention
주제어
#상향류식 혐기성여상 유가공폐수 폐수 PERFORMANCES UPFLOW ANAEROBIC FILTERS TREATING DAIRY WASTEWATER
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