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TREATMENT OF A WOOD PRESERVING EFFLUENT CONTAINING PENTACHLOROPHENOL BY ACTIVATED SLUDGE AND CARBON ADSORPTION B.E. Jank, Head Biological Processes Section PJ.A. Fowlie, Chemist Wastewater Technology Centre Environmental Protection Service Environment Canada Burlington, Ontario INTRODUCTION Regulations and guidelines for controding the wastewater from the wood preservation industry are currently being considered by Environment Canada. In the event that it is decided to proceed with the development of effluent regulations/guidelines, it is necessary to establish a data base in order to define best practicable technology (BPT) for the treatment of wood preserving wastes. To accomplish this, the Wastewater Technology Center, Burlington, Ontario, undertook a comprehensive sampling and monitoring program at the activated sludge system at Abitibi-Northern Wood Preservers Limited, Thunder Bay, Ontario. The program was carried out from November 1, 1977 to May 1, 1978, and was divided into three phases. The first phase involved the monitoring and upgrading of the existing full-scale activated sludge system. In the second phase, the activated sludge effluent was treated by a granular activated carbon column system. During the last phase of the study, the activated sludge system was bypassed, and the wastewater, after od separation and flow equalization, was treated in the activated carbon system directly. The specific objectives of the study were to collect information which could be used in the identification of BPT for the treatment of wood preserving wastes and to provide a data base to be used in the development of regulations limiting the discharge of deleterious substances to the environment by this industry. SOURCE OF WASTEWATER The Abitibi-Northern Wood Preservers Limited, Thunder Bay, Ontario, preserves various wood products such as telephone poles, radway ties and lumber for decks and wharfs. Three different preservatives, pentachlorophenol (PCP), creosote and chromated copper arsenate (CCA), are used in the wood preserving operation. Hydro poles are treated with PCP, radway ties with creosote and lumber for decks and wharfs with CCA. Wood conditioning and treatment are carried out in three retorts. Creosote is used in two of the retorts, with the third used for either PCP or CCA preservative. At the time of the study, the plant is processing approximately 196,000 m3 of wood annually. The wastewater discharged to the treatment plant is the condensate generated during open steam conditioning The condensate is contaminated with water-soluble wood extractives, primardy carbohydrates. Because wood conditioning and treatment are carried out in the same retort, the condensate generated fodowing treatment with the od-borne preservatives, creosote and PCP is highly contaminated. This problem does not exist fodowing treatment with CCA as the water4>orne preservative drains from the retort and is completely recovered. The condensates produced during conditioning fodowing CCA treatment may contain traces of chromium, copper and arsenic; however, they are generady considered to be uncontaminated by the preservative. 63
Object Description
Purdue Identification Number | ETRIWC198009 |
Title | Treatment of a wood preserving effluent containing pentachlorophenol by activated sludge and carbon adsorption |
Author |
Jank, B. E. Fowlie, P. J. A. |
Date of Original | 1980 |
Conference Title | Proceedings of the 35th Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,31542 |
Extent of Original | p. 63-79 |
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 | 2009-10-22 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 63 |
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 | TREATMENT OF A WOOD PRESERVING EFFLUENT CONTAINING PENTACHLOROPHENOL BY ACTIVATED SLUDGE AND CARBON ADSORPTION B.E. Jank, Head Biological Processes Section PJ.A. Fowlie, Chemist Wastewater Technology Centre Environmental Protection Service Environment Canada Burlington, Ontario INTRODUCTION Regulations and guidelines for controding the wastewater from the wood preservation industry are currently being considered by Environment Canada. In the event that it is decided to proceed with the development of effluent regulations/guidelines, it is necessary to establish a data base in order to define best practicable technology (BPT) for the treatment of wood preserving wastes. To accomplish this, the Wastewater Technology Center, Burlington, Ontario, undertook a comprehensive sampling and monitoring program at the activated sludge system at Abitibi-Northern Wood Preservers Limited, Thunder Bay, Ontario. The program was carried out from November 1, 1977 to May 1, 1978, and was divided into three phases. The first phase involved the monitoring and upgrading of the existing full-scale activated sludge system. In the second phase, the activated sludge effluent was treated by a granular activated carbon column system. During the last phase of the study, the activated sludge system was bypassed, and the wastewater, after od separation and flow equalization, was treated in the activated carbon system directly. The specific objectives of the study were to collect information which could be used in the identification of BPT for the treatment of wood preserving wastes and to provide a data base to be used in the development of regulations limiting the discharge of deleterious substances to the environment by this industry. SOURCE OF WASTEWATER The Abitibi-Northern Wood Preservers Limited, Thunder Bay, Ontario, preserves various wood products such as telephone poles, radway ties and lumber for decks and wharfs. Three different preservatives, pentachlorophenol (PCP), creosote and chromated copper arsenate (CCA), are used in the wood preserving operation. Hydro poles are treated with PCP, radway ties with creosote and lumber for decks and wharfs with CCA. Wood conditioning and treatment are carried out in three retorts. Creosote is used in two of the retorts, with the third used for either PCP or CCA preservative. At the time of the study, the plant is processing approximately 196,000 m3 of wood annually. The wastewater discharged to the treatment plant is the condensate generated during open steam conditioning The condensate is contaminated with water-soluble wood extractives, primardy carbohydrates. Because wood conditioning and treatment are carried out in the same retort, the condensate generated fodowing treatment with the od-borne preservatives, creosote and PCP is highly contaminated. This problem does not exist fodowing treatment with CCA as the water4>orne preservative drains from the retort and is completely recovered. The condensates produced during conditioning fodowing CCA treatment may contain traces of chromium, copper and arsenic; however, they are generady considered to be uncontaminated by the preservative. 63 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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