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Biodegradability of [14C]methylcellulose by activated sludge
Applied and Environmental Microbiology
|October 1, 1976
Summary
Biodegradation of Methocel methylcellulose ethers was confirmed using activated sludge tests. While degradation occurred, the rate was slow, with significant amounts remaining as CO2 and suspended solids after 20 days.
Area of Science:
- Environmental science
- Biotechnology
- Polymer science
Background:
- Methylcellulose ethers like Methocel are widely used in various industries.
- Understanding the environmental fate and biodegradability of these polymers is crucial.
Purpose of the Study:
- To assess the biodegradability of Methocel methylcellulose ethers.
- To quantify the degradation rate and products in an activated sludge system.
Main Methods:
- Batch-type activated sludge tests were employed.
- Radioactive [14C]methyl labels were used to track methylcellulose degradation.
- Measurements included 14CO2 evolution, radioactivity in suspended solids, and polymeric material analysis.
Main Results:
- Methocel methylcellulose ethers demonstrated biodegradability.
- The maximum degradation rate was 0.62 mg/g/day, achieved after one week.
- After 20 days, 55-73% of radioactivity was converted to 14CO2, with 12-15% in suspended solids, and only 4% remaining polymeric.
- Thin-layer chromatography identified at least two degradation products in the supernatant.
Conclusions:
- Methocel methylcellulose ethers are biodegradable in activated sludge systems.
- The degradation process is relatively slow, with incomplete mineralization within 20 days.
- Further research is needed to identify specific degradation products and pathways.