Donald m gray (61 resultados)

Hardcover. Condición: Like New. No Jacket. Like New. May have some shelf wear from being out in store. All Orders Shipped With Tracking And Delivery Confirmation Numbers.

paperback. Condición: Good. Most items will be dispatched the same or the next working day. A copy that has been read but remains in clean condition. All of the pages are intact and the cover is intact and the spine may show signs of wear. The book may have minor markings which are not specifically mentioned. Ex library copy with usual stamps & stickers.…

Trade Paperback. Condición: Acceptable. Estado de la sobrecubierta: no dust jacket present. The book is in fair condition, with noticeable wear on the cover, including creases and edge wear. The spine shows signs of use, and the pages are clean with no inscriptions or library markings. There is no dust jacket, typical for trade paperbacks of this period.…

Soft cover. Condición: Good. No Jacket. 2nd Edition. fat 8vo, pages numbered by sections. 23 sections, 1.5 inches thick. Book has been out in the field, some water stain and soil, plus a little scraping to covers and edges only. Interior is clean, no underlining, notes. Corners thumbed. Weight just over two pounds.…

Hardcover. Condición: Good. No Jacket. Pages can have notes/highlighting. Spine may show signs of wear. ~ ThriftBooks: Read More, Spend Less.

Soft Cover. Condición: Very Good with no dust jacket. Square, tight binding. Wraps are yellow and white with general soiling and light shelf wear. Pages clean, bright. Contents: Kane and Stewart, "Rome: Eternal City with a Modern Air"; Grosvenor, G. & Marden, "Hydrofoil Ferry 'Flies' the Strait of Messina"; Mann, Sisson & McBain, "The Wild Animals in My Life"; Platt, "A Visit to the Living Ice Age"; Gray, "Three Roads to Rainbow"; Bumstead, "Rockets Explore the Air Above Us." Back of wraps displays a Coca-Cola ad, "When you come to Hawaii.," with art in color by Jack Potter (1927-2008). 10.0" tall. Illustrated by Jack Potter (Coca Cola ad on back o (ilustrador).…

Hardcover. Condición: Very Good+. Estado de la sobrecubierta: Very Good. First Edition. Book is clean and tight. Dust jacket has a bit of wear (small tear at fold corner) and a bookstore label on back.; 8vo 8" - 9" tall; 94 pages.

Encompassing about 21,000 km in southwestern Arizona, the Ajo an Lukeville 1º by 2º quadrangles have been the subject of mineral resource investigations utilizing field and laboratory studies in the disciplines of geology, geochemistry, geophysics, and Landsat imagery. DH4. stapled binding, 11" Tall, cover clean, 27 pages. …

Cloth. Condición: Very Good. Estado de la sobrecubierta: Very Good. First Edition. 289pp. How to treat yourself at home and how to make the best of your GP's time . Dj slightly faded to spine.

Condición: New. Satisfaction Guaranteed or your money back.

Hardback. Condición: Very Good. Keith M. Gray (ilustrador).

Hardcover. Condición: Very Good. 1st Edition. In Very Good Used Condition. May Have Minor Shelf Wear To Edges. For More Information On Condition. Please See All Photos. ~ En Très Bon État D'usage. Peut Avoir Une Usure Mineure De L'étagère Sur Les Bords. Pour Plus D'informations Sur L'état. Veuillez Voir Toutes Les Photos. Heavy Item - No Additional Shipping Charges. Vintage 1972.…

Hardback. Condición: Very Good. Keith M. Gray (ilustrador).

[0-912394-07-2] 1973. (Oversize paperback) Very good. Maps, graphs, tables, bibliography, index. Locale: Canada. (Science, Hydrology).

Condición: New.

PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condición: New. New Book. Shipped from UK. Established seller since 2000.

Condición: New.

Condición: As New. Unread book in perfect condition.

Condición: new.

Condición: new.

Condición: New. In English.

Paperback. Condición: new. Paperback. The purpose of this research was to evaluate and compare various thermophilic anaerobic digestion processes for meeting U.S. EPA biosolids Class A pathogen standards. The project was split into three phases. Phase 1 screened three bench-scale thermophilic anaerobic process configurations at three different thermophilic temperatures based on their fecal coliform destruction efficiency. All three of the thermophilic process configurations tested were capable of achieving the Class A fecal coliform standard and were included in Phase 2. In Phase 2, bench-scale anaerobic digesters were fed primary sludge seeded with E.coli, helminth ova, poliovirus, and Salmonella to evaluate pathogen destruction. Two process configurations, the thermophilic single-stage and the two-stage mesophilic acid-phase/thermophilic methane-phase system, met Class A requirements at 50oC. In Phase 3, the single-stage thermophilic anaerobic digestion process was compared to the single-stage mesophilic process at full scale (1.5-MG digesters) based on fecal coliform and pathogen destruction, process performance, digested sludge dewaterability, and odor generation.Pathogen destruction and process performance comparisons of the various process configurations are presented for each phase of the study. Based on the fecal coliform data presented here, an empirical model was developed for quantitatively comparing multiple stage and single-stage thermophilic anaerobic digester performance. The model demonstrates that various combinations of thermophilic temperatures, staging, and residence times can achieve the Class A fecal coliform requirement. This study also suggests that anaerobic digesters operating in the lower thermophilic temperature range (approximately 50degreeC) are not only capable of achieving Class A requirements but may also produce digested sludges with less odor and lower volatile solids than digesters operating at higher thermophilic temperatures. The purpose of this research was to evaluate and compare various thermophilic anaerobic digestion processes for meeting U.S. EPA biosolids Class A pathogen standards. The project was split into three phases. Phase 1 screened three bench-scale thermophilic anaerobic process configurations at three different thermophilic temperatures based on their fecal coliform destruction efficiency. All three of the thermophilic process configurations tested were capable of achieving the Class A fecal coliform standard and were included in Phase 2. In Phase 2, bench-scale anaerobic digesters were fed primary sludge seeded with E.coli, helminth ova, poliovirus, and Salmonella to evaluate pathogen destruction. Two process configurations, the thermophilic single-stage and the two-stage mesophilic acid-phase/thermophilic methane-phase system, met Class A requirements at 50oC. In Phase 3, the single-stage thermophilic anaerobic digestion process was compared to the single-stage mesophilic process at full scale (1.5-MG digesters) based on fecal coliform and pathogen destruction, process performance, digested sludge dewaterability, and odor generation. Pathogen destruction and process performance comparisons of the various process configurations are presented for each phase of the study. Based on the fecal coliform data presented here, an empirical model was developed for quantitatively comparing multiple stage and single-stage thermophilic anaerobic digester performance. The model demonstrates that various combinations of thermophilic temperatures, staging, and residence times can achieve the Class A fecal coliform requirement. This study also suggests that anaerobic digesters operating in the lower thermophilic temperature range (approximately 50A0C) are not only capable of achieving Class A requirements but may also produce digested sludges with less odor and lower volatile solids than digesters operating at higher Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

Paperback. Condición: new. Paperback. Successful operation of the activated sludge process relies heavily on the ability to effectively separate mixed liquor into return activated sludge (RAS) and a high quality final effluent. Solids separation efficiency is dictated in large part by the relative population of floc-forming and filamentous microorganisms present in the activated sludge. During normal operation, mixed liquor will be composed primarily of floc-formers with relatively low levels of filamentous organisms. Some population of filamentous organisms is necessary to promote the formation of larger flocs and prevent development of a "pin-floc" condition, which often results in high effluent turbidities (Jenkins, 2004). However, when conditions favoring the growth of filaments over floc-formers occur, a condition commonly referred to as filamentous "bulking" may occur. Successful operation of the activated sludge process relies heavily on the ability to effectively separate mixed liquor into return activated sludge (RAS) and a high quality final effluent. Solids separation efficiency is dictated in large part by the relative population of floc-forming and filamentous microorganisms present in the activated sludge. During normal operation, mixed liquor will be composed primarily of floc-formers with relatively low levels of filamentous organisms. Some population of filamentous organisms is necessary to promote the formation of larger flocs and prevent development of a "pin-floc" condition, which often results in high effluent turbidities (Jenkins, 2004). However, when conditions favoring the growth of filaments over floc-formers occur, a condition commonly referred to as filamentous "bulking" may occur. Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

Condición: As New. Unread book in perfect condition.

Condición: New. pp. 196 6:B&W 8.25 x 11 in or 280 x 210 mm Perfect Bound on White w/Gloss Lam.

Condición: New. pp. 220 Illus.

Paperback. Condición: New. The purpose of this research was to evaluate and compare various thermophilic anaerobic digestion processes for meeting U.S. EPA biosolids Class A pathogen standards.  The project was split into three phases. Phase 1 screened three bench-scale thermophilic anaerobic process configurations at three different thermophilic temperatures based on their fecal coliform destruction efficiency. All three of the thermophilic process configurations tested were capable of achieving the Class A fecal coliform standard and were included in Phase 2. In Phase 2, bench-scale anaerobic digesters were fed primary sludge seeded with E.coli, helminth ova, poliovirus, and Salmonella to evaluate pathogen destruction. Two process configurations, the thermophilic single-stage and the two-stage mesophilic acid-phase/thermophilic methane-phase system, met Class A requirements at 50oC. In Phase 3, the single-stage thermophilic anaerobic digestion process was compared to the single-stage mesophilic process at full scale (1.5-MG digesters) based on fecal coliform and pathogen destruction, process performance, digested sludge dewaterability, and odor generation. Pathogen destruction and process performance comparisons of the various process configurations are presented for each phase of the study. Based on the fecal coliform data presented here, an empirical model was developed for quantitatively comparing multiple stage and single-stage thermophilic anaerobic digester performance. The model demonstrates that various combinations of thermophilic temperatures, staging, and residence times can achieve the Class A fecal coliform requirement. This study also suggests that anaerobic digesters operating in the lower thermophilic temperature range (approximately 50?C) are not only capable of achieving Class A requirements but may also produce digested sludges with less odor and lower volatile solids than digesters operating at higher thermophilic temperatures.…