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A gravity independent biological gre...

Nashashibi, Majda' Midhat.

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A gravity independent biological grey water treatment system for space applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A gravity independent biological grey water treatment system for space applications./
作者:	Nashashibi, Majda' Midhat.
面頁冊數:	187 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 2007.
Contained By:	Dissertation Abstracts International63-04B.
標題:	Engineering, Environmental. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3050171
ISBN:	0493646663

A gravity independent biological grey water treatment system for space applications.
Nashashibi, Majda' Midhat.

A gravity independent biological grey water treatment system for space applications. - 187 p.

Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 2007.

Thesis (Ph.D.)--Stevens Institute of Technology, 2002.

Biological treatment of grey water in space presents serious challenges, stemming mainly from microgravity conditions. The major concerns are phase separation and mass transfer limitations. To overcome solid-liquid phase separation, novel immobilized cell packed bed (ICPB) bioreactors have been developed to treat synthetic grey water. Packed bed bioreactors provide a unique environment for attached microbial growth resulting in high biomass concentrations, which greatly enhance process efficiency with substantial reductions in treatment time and reactor volume. To overcome the gas-liquid phase separation and mass transfer limitations, an oxygenation module equipped with tubular membranes has been developed to deliver bubble-less oxygen under pressure. The selected silicone membranes are hydrophobic, non-porous and oxygen selective. Oxygen dissolves in the walls of the membranes and then diffuses into the water without forming bubbles. Elevated pressures maintain all gaseous by-products in solution and provide high dissolved oxygen concentrations within the system.

ISBN: 0493646663Subjects--Topical Terms:

783782
Engineering, Environmental.

A gravity independent biological grey water treatment system for space applications.
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245 1 0 $a A gravity independent biological grey water treatment system for space applications.
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500 $a Source: Dissertation Abstracts International, Volume: 63-04, Section: B, page: 2007.
500 $a Chair: Christos Christodoulatos.
502 $a Thesis (Ph.D.)--Stevens Institute of Technology, 2002.
520 $a Biological treatment of grey water in space presents serious challenges, stemming mainly from microgravity conditions. The major concerns are phase separation and mass transfer limitations. To overcome solid-liquid phase separation, novel immobilized cell packed bed (ICPB) bioreactors have been developed to treat synthetic grey water. Packed bed bioreactors provide a unique environment for attached microbial growth resulting in high biomass concentrations, which greatly enhance process efficiency with substantial reductions in treatment time and reactor volume. To overcome the gas-liquid phase separation and mass transfer limitations, an oxygenation module equipped with tubular membranes has been developed to deliver bubble-less oxygen under pressure. The selected silicone membranes are hydrophobic, non-porous and oxygen selective. Oxygen dissolves in the walls of the membranes and then diffuses into the water without forming bubbles. Elevated pressures maintain all gaseous by-products in solution and provide high dissolved oxygen concentrations within the system.
520 $a The packing media are lightweight, inexpensive polyethylene terephthalate (PET) flakes that have large specific surface area, act as a filter for solids and yield highly tortuous flow paths thereby increasing the contact time between the biomass and contaminants. Tests on both pressurized and ambient pressure ICPB bioreactors revealed organic carbon removal efficiencies over 90%. Despite the high ammonia level in the influent, nitrification occured in both the ambient pressure and pressurized nitrification bioreactors at efficiencies of 80% and 60%, respectively.
520 $a Biomass yield was approximately 0.20 g volatile suspended solids per gram of grey water-COD processed in the pressurized bioreactor. The biomass yield of such novel aerobic ICPB systems is comparable to that of anaerobic processes. These efficient systems produce minimal amounts of biomass compared to other aerobic processes, making them less prone to clogging under long operation periods. The effluent contains low concentration of suspended solids, thus further phase separation may not be necessary. The maintenance requirements are minimal, thereby reducing labor time. The bioreactors could sustain loading and pressure shocks with rapid recovery.
520 $a An empirical model has been developed for design and scale-up of the pressurized bioreactor for organic carbon and nitrogen conversions. NASA-Johnson Space Center adopted the nitrification bioreactor for prototype testing and potential future use in long duration human space missions.
590 $a School code: 0733.
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790 1 0 $a Christodoulatos, Christos, $e advisor
790 $a 0733
791 $a Ph.D.
792 $a 2002
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