Chemical oxygen demand of shell chemicals
HERO ID
1579615
Reference Type
Technical Report
Subtype
TSCA Submission
Year
1982
Language
English
| HERO ID | 1579615 |
|---|---|
| Material Type | TSCA Submission |
| Year | 1982 |
| Title | Chemical oxygen demand of shell chemicals |
| Authoring Organization | Shell Oil Company |
| Publisher Text | U.S. Environmental Protection Agency |
| City | Rockville, MD |
| Abstract | Measurement of the biochemical oxygen demand (BOD) of discharged waste water is required by the authorities in several countries to characterize the concentration of polluting (usually organic) material in the water. It is therefore of importance to Shell and their customers to establish to what extent Shell chemicals are biodegradable and contribute to the BOD of waste water. The BOD may be defined as the quantity of oxygen required for the biological and chemical oxidation of water-borne substances under the conditions of test. In this test a very dilute (usually < 10 mg/1) aqueous solution of a chemical is incubated at 20 °C for 5 days in the presence of a selected biota. Comparison of the oxygen content of the solution at the beginning and at the end of the incubation period provides a measure of the BOD. We carried out our tests according to the method described in the APHA "Standard Methods" No. 219. except tint we added 0.5 mg/l allyl thiourea to prevent nitrification. As the inoculum we applied the efflluent of a municipal sewage treatment plant. In cases where we expected appreciably higher BOD results from an adapted inoculum. We realized adaptation by feeding the bacteria in the original seed With the chemical compound concerned. Our results are presented in the following table expressed as gram oxygen per gram chemical substance. For evaluation of these figures we also calculated the degradation percentage, %TOD. This TOD (theoretical oxygen demand) represents the amount of oxygen needed for complete oxidation of the carbon hydrogen and sulfur to carbon dioxide, water and sulfuric acid. In our TOD calculation we assumed that haIogen atoms were left as halides. -NH2-nitrogen as ammonia and –NO2-nitrogen as nitrate. (In practice oxygen demands higher than 75% of the TOD are not reached because in the test period the bacteria produce new cells and thus not completely mineralize a substrate.) |
| Report Number | TSCATS/017782 |
| Ntis Number | Doc #878210096 |
| Tscats Number | TSCATS/017728 |
| Url | https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/OTS0206205.xhtml |
| Is Certified Translation | No |
| Dupe Override | No |
| Number Of Pages | 190 |
| Comments | Journal: EPA ISSN: |
| Is Public | Yes |
| Language Text | English |
| Keyword | <?xml version="1.0" encoding="UTF-8"?><kw>SHELL OIL CO</kw>; <?xml version="1.0" encoding="UTF-8"?><kw>HALOGENATED ALKYL EPOXIDES</kw>; <?xml version="1.0" encoding="UTF-8"?><kw>ENVIRONMENTAL FATE</kw>; <?xml version="1.0" encoding="UTF-8"?><kw>BIODEGRADATION</kw> |
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