SURVEY ON BIOLOGICAL GROWTH IN IMPROVED ACTIVATED – SLUDGE SYSTEM BY PAC
In this research, the effects of the addition of powdered activated carbon (PAC) into the aeration zone of an activated-sludge (AS) system for treating Tehran Oil Refinery effluent, was investigated during more than 12 months in a PACT pilot-scale model. Besides the evaluation of organics removal ef...
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| Format: | Article |
| Language: | English |
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Tehran University of Medical Sciences
1999-08-01
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| Series: | Iranian Journal of Public Health |
| Subjects: | |
| Online Access: | http://journals.tums.ac.ir/PdfMed.aspx?pdf_med=/upload_files/pdf/810.pdf&manuscript_id=810 |
| _version_ | 1818393858374893568 |
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| author | N. Djaafarzadeh S. Nasseri A. Mesdaghinia |
| author_facet | N. Djaafarzadeh S. Nasseri A. Mesdaghinia |
| author_sort | N. Djaafarzadeh |
| collection | DOAJ |
| description | In this research, the effects of the addition of powdered activated carbon (PAC) into the aeration zone of an activated-sludge (AS) system for treating Tehran Oil Refinery effluent, was investigated during more than 12 months in a PACT pilot-scale model. Besides the evaluation of organics removal efficiency and determination of basic design factors kinetic coefficients, a series of experiments were conducted in order to study the variations in biological growth (especially bacteria and monocellular organisms) related to PAC addition. After sampling from mixed liquor and microscopical studies, adequate samples were filtered, dewatered and fixed. The samples were then coated by 100 A films of (Au) and were studied by scanning electron microscopy (SEM). Results showed significant improvement of bacteria and monocellular organisms in the presence of PAC, which may be raised from providing more contact surface and better nutrient availability for microorganisms, decreasing the effects of toxic shock loads and providing better conditions for microorganisms against intensive mixing. Electronic photomicrographs by SEM confirmed good attachments of ciliate to PAC particles, along with appropriate efficiency of bacteria diffusion into its meso and microspores. Also, the comparison between the count number of protozoa in two pilots of PACT and AS, showed better conditions for growth of microorganisms, using PAC. |
| first_indexed | 2024-12-14T05:51:59Z |
| format | Article |
| id | doaj.art-806de3f58757489b95d99d3e4f789946 |
| institution | Directory Open Access Journal |
| issn | 2251-6085 |
| language | English |
| last_indexed | 2024-12-14T05:51:59Z |
| publishDate | 1999-08-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | Iranian Journal of Public Health |
| spelling | doaj.art-806de3f58757489b95d99d3e4f7899462022-12-21T23:14:42ZengTehran University of Medical SciencesIranian Journal of Public Health2251-60851999-08-01281-44150SURVEY ON BIOLOGICAL GROWTH IN IMPROVED ACTIVATED – SLUDGE SYSTEM BY PACN. DjaafarzadehS. NasseriA. MesdaghiniaIn this research, the effects of the addition of powdered activated carbon (PAC) into the aeration zone of an activated-sludge (AS) system for treating Tehran Oil Refinery effluent, was investigated during more than 12 months in a PACT pilot-scale model. Besides the evaluation of organics removal efficiency and determination of basic design factors kinetic coefficients, a series of experiments were conducted in order to study the variations in biological growth (especially bacteria and monocellular organisms) related to PAC addition. After sampling from mixed liquor and microscopical studies, adequate samples were filtered, dewatered and fixed. The samples were then coated by 100 A films of (Au) and were studied by scanning electron microscopy (SEM). Results showed significant improvement of bacteria and monocellular organisms in the presence of PAC, which may be raised from providing more contact surface and better nutrient availability for microorganisms, decreasing the effects of toxic shock loads and providing better conditions for microorganisms against intensive mixing. Electronic photomicrographs by SEM confirmed good attachments of ciliate to PAC particles, along with appropriate efficiency of bacteria diffusion into its meso and microspores. Also, the comparison between the count number of protozoa in two pilots of PACT and AS, showed better conditions for growth of microorganisms, using PAC.http://journals.tums.ac.ir/PdfMed.aspx?pdf_med=/upload_files/pdf/810.pdf&manuscript_id=810Biological growthAS system |
| spellingShingle | N. Djaafarzadeh S. Nasseri A. Mesdaghinia SURVEY ON BIOLOGICAL GROWTH IN IMPROVED ACTIVATED – SLUDGE SYSTEM BY PAC Iranian Journal of Public Health Biological growth AS system |
| title | SURVEY ON BIOLOGICAL GROWTH IN IMPROVED ACTIVATED – SLUDGE SYSTEM BY PAC |
| title_full | SURVEY ON BIOLOGICAL GROWTH IN IMPROVED ACTIVATED – SLUDGE SYSTEM BY PAC |
| title_fullStr | SURVEY ON BIOLOGICAL GROWTH IN IMPROVED ACTIVATED – SLUDGE SYSTEM BY PAC |
| title_full_unstemmed | SURVEY ON BIOLOGICAL GROWTH IN IMPROVED ACTIVATED – SLUDGE SYSTEM BY PAC |
| title_short | SURVEY ON BIOLOGICAL GROWTH IN IMPROVED ACTIVATED – SLUDGE SYSTEM BY PAC |
| title_sort | survey on biological growth in improved activated sludge system by pac |
| topic | Biological growth AS system |
| url | http://journals.tums.ac.ir/PdfMed.aspx?pdf_med=/upload_files/pdf/810.pdf&manuscript_id=810 |
| work_keys_str_mv | AT ndjaafarzadeh surveyonbiologicalgrowthinimprovedactivatedsludgesystembypac AT snasseri surveyonbiologicalgrowthinimprovedactivatedsludgesystembypac AT amesdaghinia surveyonbiologicalgrowthinimprovedactivatedsludgesystembypac |