Liquid-solid circulating fluidized beds: An immobilized bioreactor system from a product inhibition perspective

Umang J. Trivedi, Amarjeet S. Bassi, Jesse Zhu

Research output: Contribution to conferencePaperpeer-review


In this investigation, soybean seed hull peroxidase enzymes were immobilized within the sol-gel/calcium-alginate matrix to produce artificial phenolic polymers from the phenolic waste streams. The soybean peroxidase enzymes are having a rapid ability to polymerize phenols in the presence of hydrogen peroxide. The produced polymers are having comparable properties with the phenol-formaldehyde resins. This enzymatic property has been investigated to produce a value-added product from the waste streams. The phenolic resins are widely used in the automotive sector, aircraft construction, building construction, mechanical equipment industries, and refractory industries. However, in many areas applicability of phenolic resins is restricted due to the toxic nature of formaldehyde. The proposed enzymatic process can eliminate the usage of formaldehyde solvent and the reaction conditions are much milder than the conventional technique. In order to use the enzymes for a long time, they are immobilized within the porous matrix. However, it has been observed that the product phenolic polymer form a black layer coating on/within the biocatalyst and the enzymatic activity is decreased drastically within a short time. To overcome the product inhibition, a liquid solid circulating fluidized bed system has been proposed and studied for this enzymatic reaction. This system will allow a simultaneous reaction and a regeneration of the biocatalysts.

Original languageEnglish
Number of pages5
Publication statusPublished - 2005
Externally publishedYes
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: 30 Oct 20054 Nov 2005


Conference05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
Country/TerritoryUnited States
CityCincinnati, OH

ASJC Scopus subject areas

  • General Engineering


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