Biological fate of a polydisperse acrylate polymer in anaerobic sand-medium transport
✍ Scribed by Bruce E. Rittmann; Benjamin Henry; Joseph E. Odencrantz; Julie A. Sutfin
- Publisher
- Springer Netherlands
- Year
- 1992
- Tongue
- English
- Weight
- 666 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0923-9820
No coin nor oath required. For personal study only.
✦ Synopsis
Soluble polyacrylate (PA), a polydisperse mixture of polyacrylate polymers, is strongly adsorbed and biodegradable. Biotic fate studies were carried out with once-through columns containing sand colonized with anaerobic biomass previously grown in a methanogenic fluidized bed. A fraction of soluble PA having a weight-average molecular weight of 16,700 and a range of molecular weight from 103 to 105 was biologically removed and mineralized to CO2. Due to its polydisperse nature, the breakthrough curve had a gradual increase to an apparent steady-state removal of approximately 60% near one day when the liquid detention time was 21 minutes. Modeling successfully explained the observed breakthrough result when the fraction was divided into components having a wide range of retardation factors (R): about 25% was strongly adsorbed (R = 200 and 500), 45% was moderately adsorbed (R = 50 and 100), and 30% was weakly adsorbed (R = 1-10). In this study, in which active biomass already was present from utilization of a primary substrate (glucose here), equilibrium adsorption increased the time to breakthrough, which also reduced the exiting concentration by increasing the substrate contact time.