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A process to prepare a synthetic filter material containing nutrients [An article from: Bioresource Technology]
Book Details
Author(s)W.C. Chan, Z.Y. Lin
PublisherElsevier
ISBN / ASINB000P6NZ10
ISBN-13978B000P6NZ13
MarketplaceFrance 🇫🇷
Description
This digital document is a journal article from Bioresource Technology, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
In this study, an optimal process to prepare a synthetic filter material (poly(vinyl alcohol) (PVA)/peat/KNO"3 composite bead) containing nutrients was developed for biofiltration. The optimal preparing condition was that each of the peat and PVA aqueous solutions contains 6.4g KNO"3 and the nitrogen content in the boric and phosphate aqueous solutions must retain higher than 3.94 and 1.52gN/l, respectively. The equilibrium amount of water-soluble nitrogen dissolved out of the prepared composite bead was between 7.95 and 8.21mgN/g dry solid. The path of water-soluble nitrogen dissolving out of the A-type bead was the water-soluble nitrogen dispersed in the peat phase initially diffused into the outer PVA phase and then it diffused out of the bead surface. And the path of water-soluble nitrogen dissolving out of the H-type bead was the water-soluble nitrogen dispersed in both the peat and PVA phases simultaneously diffused into the outer PVA phase and out of the bead surface, respectively. The microbial growth rate k"g of the H-type composite bead was higher than that of the A-type composite bead approximately 1.09-1.58 times, and its value was between 0.100 and 0.417day^-^1 as the composite bead was immersed in 0-0.896M KNO"3 solution. The maximum value of k"g appeared at the composite bead immersed in 0.384M KNO"3 solution and was higher than that of the compost by a factor approximately 1.49. The percentage of removed volatile organic compounds (VOCs) remained at more than 98% during the biofilter operating 230days as the composite bead was immersed in KNO"3 aqueous solution before packing. This composite bed was without the further addition of nutrients during this operating period. It was proved that this composite bead was superior to the compost as a filter material.
Description:
In this study, an optimal process to prepare a synthetic filter material (poly(vinyl alcohol) (PVA)/peat/KNO"3 composite bead) containing nutrients was developed for biofiltration. The optimal preparing condition was that each of the peat and PVA aqueous solutions contains 6.4g KNO"3 and the nitrogen content in the boric and phosphate aqueous solutions must retain higher than 3.94 and 1.52gN/l, respectively. The equilibrium amount of water-soluble nitrogen dissolved out of the prepared composite bead was between 7.95 and 8.21mgN/g dry solid. The path of water-soluble nitrogen dissolving out of the A-type bead was the water-soluble nitrogen dispersed in the peat phase initially diffused into the outer PVA phase and then it diffused out of the bead surface. And the path of water-soluble nitrogen dissolving out of the H-type bead was the water-soluble nitrogen dispersed in both the peat and PVA phases simultaneously diffused into the outer PVA phase and out of the bead surface, respectively. The microbial growth rate k"g of the H-type composite bead was higher than that of the A-type composite bead approximately 1.09-1.58 times, and its value was between 0.100 and 0.417day^-^1 as the composite bead was immersed in 0-0.896M KNO"3 solution. The maximum value of k"g appeared at the composite bead immersed in 0.384M KNO"3 solution and was higher than that of the compost by a factor approximately 1.49. The percentage of removed volatile organic compounds (VOCs) remained at more than 98% during the biofilter operating 230days as the composite bead was immersed in KNO"3 aqueous solution before packing. This composite bed was without the further addition of nutrients during this operating period. It was proved that this composite bead was superior to the compost as a filter material.
