Removal of Plant Nutrients by Means of Aerobic Stabilization of Sludge
| Autor: | Roar L. Irgens, H. Orin Halvorson |
|---|---|
| Rok vydání: | 1965 |
| Předmět: |
Chemical Phenomena
Nitrogen Sewage chemistry.chemical_element General Biochemistry Genetics and Molecular Biology Phosphates chemistry.chemical_compound Nutrient General Pharmacology Toxicology and Pharmaceutics Effluent Wastewater quality indicators Chromatography General Immunology and Microbiology business.industry Research Phosphorus Articles General Medicine Plants Pulp and paper industry Oxygen Chemistry Anaerobic digestion chemistry Carbon dioxide Water Microbiology business |
| Zdroj: | Applied Microbiology. 13:373-386 |
| ISSN: | 0003-6919 |
| Popis: | In the conventional treatment of sewage, the solids are normally disposed of by anaerobic digestion. This leaves a considerable amount of plant nutrients, such as nitrogen and phosphate, as soluble compounds which will eventually find their way into the plant's final effluent, since the supernatant fluid from the digesters is normally returned to the raw sewage. In a recent investigation, we found that, if the sludges were treated by an aerobic process, a significant portion of the carbonaceous matter was oxidized to carbon dioxide and water, and the rest was assimilated into microbial protoplasm. This process tied up the available nitrogen and phosphorus so that practically none remained dissolved in the suspending liquid. The accumulated solids, consisting mostly of microbial cells, were separated very easily from the liquid, leaving a slightly colored supernatant fluid that was water-clear, free from plant nutrients, and very low in BOD and COD. The overall process was accomplished in a detention time not exceeding 20 days, in contrast to anaerobic digestion which requires from 50 to 70 days. |
| Databáze: | OpenAIRE |
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