Current status of the pure oxygen activated sludge process in Canadian mills.Application: Mills that operate oxygen activated sludge This article or section deals primarily with the United Kingdom and does not represent a worldwide view of the subject. Please [ improve this article] or discuss the issue on the talk page. systems are generally satisfied with their performance. Many mills have installed enclosed oxygen activated sludge (OAS OAS See: Option adjusted spread ) systems, based partly on claims that these designs produce less sludge and are able to handle foul condensates. Recently Paprican surveyed member companies that operate OAS systems, and a review of their collective experiences are presented here. One issue raised by the survey is the high concentrations of carbon dioxide carbon dioxide, chemical compound, CO2, a colorless, odorless, tasteless gas that is about one and one-half times as dense as air under ordinary conditions of temperature and pressure. commonly found in the treated effluent. These concentrations can cause acute toxicity acute toxicity Pharmacology Illness caused by a single exposure to a toxic substance to trout. Another issue is the possibility that volatile organic effluent components may activate combustible com·bus·ti·ble adj. Capable of igniting and burning. n. A substance that ignites and burns readily. gas alarms. On the positive side, the systems are designed to be compact, they can handle condensates, and they have the ability to control oxygen dosage based on uptake. These features make the OAS system an attractive option. On the whole, the mills surveyed report satisfaction with the performance of OAS systems. Paice, Kovacs, Bergeron, and O'Connor are with the Pulp and Paper Research Institute of Canada, 570 St. John's Blvd., Pointe Claire, QC, Canada H9R 3J9. Email Paice at mpaice@paprican.ca. |
|
||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion