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MICROBIAL RESPONSES TO ORGANIC SPECIES IN INDUSTRIAL LANDFILL LEACHATE Patricia Corbo, Graduate Student R. C. Ahlert, Professor II Department of Chemical and Biochemical Engineering Rutgers University Piscataway, New Jersey 08854 INTRODUCTION Industrial landfill leachate refers to liquid residuals produced by water runoff due to rain, surface water, and/or groundwater that has become contaminated as it passes from or through a landfill. Such leachate differs from other leachates, not in the manner by which it is produced, but in the composition of the contaminants because of the site's industrial rather than sanitary character. The liquid usually contains several oil and aqueous phases; these can be physically separated. The bulk aqueous phase contains synthetic organic compounds, dispersed oil, suspended particles, colloids and heavy metals. Typical leachate gross contaminant parameter levels exceed those of domestic wastewater and may include high levels of individual contaminants (Table I). The aqueous phase of a leachate can be considered a high strength industrial wastewater. Renovation techniques typical for these wastewaters are being evaluated, including physical/chemical treatments and biological methods. Biological treatment is of particular interest because of extensive experience with rapid stabilization of domestic wastewaters and some industrial wastewaters. Biological treatment employs a mixed population of microorganisms to remove a very broad array of organic species from the wastewater by: (1) ultimate disposal as C02 and H20 (aerobic) or C02, CH4, N2, and H2 (anaerobic); (2) partial breakdown to lower molecular weight compounds; (3) absorption on or into cellular material; or, most likely, (4) a combination of these processes. Pretreatment of wastewater or leachate may be necessary to remove large suspended particles, heavy metals, and other materials that inhibit the metabolic pathways of microorganisms. There is virtually no literature pertaining to biological treatment of industrial leachates. Biological treatment of sanitary landfill leachates has been addressed, however, with variable success. COD removal rates of 60-99% have been reported for aerobic and anaerobic treatment methods [1-4]. EXPERIMENTAL Description of Leachate The leachate used in this study was supplied by the USEPA Oil and Hazardous Materials Spill Branch. The bulk aqueous phase was separated from the bulk oil phase by gravity separation and stored at 10 C or below. Pretreatment of the aqueous phase with lime at about 6 gm/1, was necessary to remove remaining dispersed oil, suspended particles, and complexed metals. The TOC contributed by the dispersed oil was minor, i.e., approximately 3-5%. The final pH was adjusted to 7 for all biological studies. Development of Activated Sludge Culture An activated sludge culture seed was obtained from the Somerset-Raritan Sewage Authority in Bridgewater, New Jersey, which receives industrial (15-20%) and domestic wastewaters. The culture 387
Object Description
Purdue Identification Number | ETRIWC198340 |
Title | Microbial responses to organic species in industrial landfill leachate |
Author |
Corbo, Patricia Ahlert, R. C., 1932- |
Date of Original | 1983 |
Conference Title | Proceedings of the 38th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,34749 |
Extent of Original | p. 387-394 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2009-07-28 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 387 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | MICROBIAL RESPONSES TO ORGANIC SPECIES IN INDUSTRIAL LANDFILL LEACHATE Patricia Corbo, Graduate Student R. C. Ahlert, Professor II Department of Chemical and Biochemical Engineering Rutgers University Piscataway, New Jersey 08854 INTRODUCTION Industrial landfill leachate refers to liquid residuals produced by water runoff due to rain, surface water, and/or groundwater that has become contaminated as it passes from or through a landfill. Such leachate differs from other leachates, not in the manner by which it is produced, but in the composition of the contaminants because of the site's industrial rather than sanitary character. The liquid usually contains several oil and aqueous phases; these can be physically separated. The bulk aqueous phase contains synthetic organic compounds, dispersed oil, suspended particles, colloids and heavy metals. Typical leachate gross contaminant parameter levels exceed those of domestic wastewater and may include high levels of individual contaminants (Table I). The aqueous phase of a leachate can be considered a high strength industrial wastewater. Renovation techniques typical for these wastewaters are being evaluated, including physical/chemical treatments and biological methods. Biological treatment is of particular interest because of extensive experience with rapid stabilization of domestic wastewaters and some industrial wastewaters. Biological treatment employs a mixed population of microorganisms to remove a very broad array of organic species from the wastewater by: (1) ultimate disposal as C02 and H20 (aerobic) or C02, CH4, N2, and H2 (anaerobic); (2) partial breakdown to lower molecular weight compounds; (3) absorption on or into cellular material; or, most likely, (4) a combination of these processes. Pretreatment of wastewater or leachate may be necessary to remove large suspended particles, heavy metals, and other materials that inhibit the metabolic pathways of microorganisms. There is virtually no literature pertaining to biological treatment of industrial leachates. Biological treatment of sanitary landfill leachates has been addressed, however, with variable success. COD removal rates of 60-99% have been reported for aerobic and anaerobic treatment methods [1-4]. EXPERIMENTAL Description of Leachate The leachate used in this study was supplied by the USEPA Oil and Hazardous Materials Spill Branch. The bulk aqueous phase was separated from the bulk oil phase by gravity separation and stored at 10 C or below. Pretreatment of the aqueous phase with lime at about 6 gm/1, was necessary to remove remaining dispersed oil, suspended particles, and complexed metals. The TOC contributed by the dispersed oil was minor, i.e., approximately 3-5%. The final pH was adjusted to 7 for all biological studies. Development of Activated Sludge Culture An activated sludge culture seed was obtained from the Somerset-Raritan Sewage Authority in Bridgewater, New Jersey, which receives industrial (15-20%) and domestic wastewaters. The culture 387 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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