mechanism of nutrients dissolved out of a synthetic composite bead filter material in a biofilter

In this study, an optimal process to prepare a synthetic material having nutrient (PVA/peat/KNO₃ composite bead) is developed. The equilibrium water-soluble nitrogen content in the composite bead prepared by this process is 8.25–10.06 mg N/g dry solid. The mass-transport process for the water-solubl...

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Bibliographic Details
Published in:Bioprocess and biosystems engineering 2004-07, Vol.26 (4), p.223-230
Main Authors: Chan, Wu-Chung, Lin, Zong-Yi
Format: Article
Language:English
Subjects:
Air Pollutants - isolation & purification
Air Pollutants - metabolism
Aqueous solutions
Biocompatible Materials - chemistry
biofilters
Cell Culture Techniques - methods
composts
Filtration - instrumentation
Filtration - methods
Manufactured Materials
mass transfer
microbial growth
Microspheres
Nitrates - chemistry
nitrogen
Nitrogen - chemistry
Nitrogen - isolation & purification
nitrogen content
nutrients
Organic Chemicals - isolation & purification
Organic Chemicals - metabolism
peat
Polyvinyl Alcohol - chemistry
Potassium Compounds - chemistry
potassium nitrate
Soil
VOCs
Volatile organic compounds
Volatilization
water holding capacity
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Summary:In this study, an optimal process to prepare a synthetic material having nutrient (PVA/peat/KNO₃ composite bead) is developed. The equilibrium water-soluble nitrogen content in the composite bead prepared by this process is 8.25–10.06 mg N/g dry solid. The mass-transport process for the water-soluble nitrogen dissolved out of the composite bead was also investigated. The dissolved out process occurs in two stages: external mass transport occurs in the early stage and the intraparticle diffusion process occurs in the long-term stage. The rate of water-soluble nitrogen dissolved out in both stages is concentration dependent. The path of nitrogen dissolved out is that the nitrogen dispersed in the peat and PVA phases simultaneously diffused into the outer PVA phase and out of the bead surface. The moisture holding capacity of the composite bead bed is better than the compost bed. The percentage of removed volatile organic compounds (VOCs) can remain at levels higher than 99% for a longer time (about 230 d) as the composite bead immersed in a KNO₃ aqueous solution before packing with an optimal concentration of KNO₃ aqueous solution of 0.384 M. The rate of nitrogen dissolved out in the intraparticle diffusion process could be used as an index to predict the microbial growth rate in the biofilter.
ISSN:1615-7591
1615-7605
DOI:10.1007/s00449-004-0355-3