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47 INDUSTRIAL WASTE IMPACT ASSESSMENT ON DOMESTIC ACTIVATED SLUDGE TREATMENT PLANTS USING RESPIROMETRY Garry A. Palmateer, Head, Microbiology Dept. Ontario Ministry of Environment and Energy Southwestern Region Laboratory London, Ontario, Canada N6E 1V3 Philip C. Thomas, Partner/President Entoxicon Systems Forest, Ontario, Canada NON 1J0 INTRODUCTION In the Province of Ontario, the need to treat increasing quantities of sewage through activated sludge secondary and tertiary treatment plants has escalated dramatically during the 1990s. However, the economy is such that enlarging the existing waste pollution control plants or constructing new plants to meet the treatment requirements is unrealistic. In addition, new industries are moving into communities whose pollution control plants have not been involved in the treatment of industrial wastes. The demand on these pollution control plants to process industrial wastes has also intensified. Operators of activated sludge treatment plants are having to manage these plants not only to meet the new sewage treatment requirements, but also to ensure that the plant discharge continuously meets the effluent guidelines. The Ontario Ministry of Environment and Energy monitors the effluent quality with regard to Certificates of Approval and ensures that effluent criteria are being met. The combination of increasing treatment demands and decreasing finances for treatment plant expansion has led to the optimization of all aspects of the activated sludge processes. To accomplish this, a variety of approaches have been employed. In the situation where industrial wastes have been implicated as the cause of poor treatment, one technique used is to analyze the industrial sewer discharges for potential toxicants. While inhibitory metals and specific organic compounds may be detected in an industrial waste, that data in itself does not prove that the growth of the bacteria and protozoa comprising the biomass of the treatment plant is being suppressed. Analytical scans can also be very expensive and provide only circumstantial evidence as to the inhibitory nature of the waste. For example, a particular industrial waste may be treatable at a specific concentration. However, metal and organic scans, or even toxicity assays, would provide minimal information on the extent to which it could be processed. An alternative approach to evaluating the impact of industrial wastes on domestic activated sludge treatment plants, using respirometry and biokinetics1 described in the literature was investigated. A methodology that demonstrates a process of monitoring the growth rate of bacteria when fed sewage typical of that received by domestic activated sludge treatment plants has been reported. 2~3 Bacterial Growth To comprehend the essence of this biokinetic evaluation of the biomass growth using respirometry, a basic knowledge of bacterial growth and cell division is necessary. Bacteria are prokaryotic, single cell microorganisms, some of which, if conditions are optimal, are capable of 51st Purdue Industrial Waste Conference Proceedings, 1996, Ann Arbor Press. Inc.. Chelsea. Michigan 48118. Printed in U.S.A. 453
Object Description
Purdue Identification Number | ETRIWC199647 |
Title | Industrial waste impact assessment on domestic activated sludge treatment plants using respirometry |
Author |
Palmateer, Garry A. Thomas, Philip C. |
Date of Original | 1996 |
Conference Title | Proceedings of the 51st Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,46351 |
Extent of Original | p. 453-462 |
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 | 2009-10-27 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 453 |
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 | 47 INDUSTRIAL WASTE IMPACT ASSESSMENT ON DOMESTIC ACTIVATED SLUDGE TREATMENT PLANTS USING RESPIROMETRY Garry A. Palmateer, Head, Microbiology Dept. Ontario Ministry of Environment and Energy Southwestern Region Laboratory London, Ontario, Canada N6E 1V3 Philip C. Thomas, Partner/President Entoxicon Systems Forest, Ontario, Canada NON 1J0 INTRODUCTION In the Province of Ontario, the need to treat increasing quantities of sewage through activated sludge secondary and tertiary treatment plants has escalated dramatically during the 1990s. However, the economy is such that enlarging the existing waste pollution control plants or constructing new plants to meet the treatment requirements is unrealistic. In addition, new industries are moving into communities whose pollution control plants have not been involved in the treatment of industrial wastes. The demand on these pollution control plants to process industrial wastes has also intensified. Operators of activated sludge treatment plants are having to manage these plants not only to meet the new sewage treatment requirements, but also to ensure that the plant discharge continuously meets the effluent guidelines. The Ontario Ministry of Environment and Energy monitors the effluent quality with regard to Certificates of Approval and ensures that effluent criteria are being met. The combination of increasing treatment demands and decreasing finances for treatment plant expansion has led to the optimization of all aspects of the activated sludge processes. To accomplish this, a variety of approaches have been employed. In the situation where industrial wastes have been implicated as the cause of poor treatment, one technique used is to analyze the industrial sewer discharges for potential toxicants. While inhibitory metals and specific organic compounds may be detected in an industrial waste, that data in itself does not prove that the growth of the bacteria and protozoa comprising the biomass of the treatment plant is being suppressed. Analytical scans can also be very expensive and provide only circumstantial evidence as to the inhibitory nature of the waste. For example, a particular industrial waste may be treatable at a specific concentration. However, metal and organic scans, or even toxicity assays, would provide minimal information on the extent to which it could be processed. An alternative approach to evaluating the impact of industrial wastes on domestic activated sludge treatment plants, using respirometry and biokinetics1 described in the literature was investigated. A methodology that demonstrates a process of monitoring the growth rate of bacteria when fed sewage typical of that received by domestic activated sludge treatment plants has been reported. 2~3 Bacterial Growth To comprehend the essence of this biokinetic evaluation of the biomass growth using respirometry, a basic knowledge of bacterial growth and cell division is necessary. Bacteria are prokaryotic, single cell microorganisms, some of which, if conditions are optimal, are capable of 51st Purdue Industrial Waste Conference Proceedings, 1996, Ann Arbor Press. Inc.. Chelsea. Michigan 48118. Printed in U.S.A. 453 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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