Biological Degradation Tests

In Situ Biological Degradation Test at Kelly Air Force Base, TX, Volume 1 Site Characterization, Lab Studies, and Treatment System Design and Installation... 

In Situ Biological Degradation Test at Kelly Air Force Base, TX,... 

Larsson Brelid, P., Simonson, R. and Bergman, O. (1997). Resistance of acetylated wood of biological degradation. Evaluation of field test. International Research Group on Wood Preservation, Doc. No. IRGAVP 97-30139. 

Zwiener C. and F.H. Frimmel (2003). Short-term tests with a pilot sewage plant and biofilm reactors for the biological degradation of the pharmaceutical compounds clofibric acid, ibu-profen, and diclofenac. Science of the Total Environment 309 201-211. 

Following biological degradation, the extract is exposed to photochemical degradation, which removes uranium from solution as polyuranate. The metals and uranium are captured in separate treatment steps, allowing for the separation of wastes into radioactive and nonradioactive waste streams. This treatment process does not create additional hazardous wastes and allows for the reuse of the contaminated soil. The technology has been the subject of bench-scale tests and is not currently commercially available. 

Tydeman, M. S., and Kirkwood, T. B. L. (1984), Design and analysis of accelerated degradation tests for the stability of biological standards. I. Properties of maximum likelihood estimators, / Biol. Stand., 12,195-206. 

Microbial attack manifests itself in so many ways that recently ASTM (American Society for Testing and Materials) established a new committee whose sole purpose is to advise other ASTM committees on biological degradation. 

The failure of esters, PCPMA and PCBMA, in these tests to afford any level of protection is probably due to the stability of these esters, which precludes release of the toxic pentachlorophenol and pentabromophenol (23). These observations serve to emphasize the importance of achieving controlled release of toxicants for protection against biological degradation. 

Test material leachate is inoculated with fresh primary settled sewage and a nutrient feed solution to promote degradation. A control reactor consists of leachate under equivalent conditions without inoculation with microorganisms. Assuming a first order biological degradation rate, the data are modeled... 

Three different films obtained by a hot pressing procedure of powder mixtures containing plasticized PVA, PVAc with and without bactmal PHB were submitted to the biological degradation of soil microorganisms in a respirometric test aimed at simulating soil burial conditions. The compositions of the blend films are summarized in Table 1. 

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