Modular shipboard membrane bioreactor system for combined wastewater streams
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C02F-001/44
C02F-003/12
출원번호
US-0934879
(1992-08-21)
발명자
/ 주소
Behmann Henry (Puslinch CAX)
출원인 / 주소
Zenon Environmental Inc. (Burlington CAX 03)
인용정보
피인용 횟수 :
96인용 특허 :
0
초록▼
Raw sewage (“black water”from toilets), wastewater from showers, sinks, kitchen facilities (“grey water”) and oily water from the bilge of a host vessel (“oily water”), in combination, unexpectedly provide the essential nutrients for a live mass of mixed microorganisms which are peculiarly well-adap
Raw sewage (“black water”from toilets), wastewater from showers, sinks, kitchen facilities (“grey water”) and oily water from the bilge of a host vessel (“oily water”), in combination, unexpectedly provide the essential nutrients for a live mass of mixed microorganisms which are peculiarly well-adapted to ingest the nutrients. To facilitate availability of oxygen to the microorganisms so as to provide growth of the microorganisms, and also, to allow them destroy to themselves, excess oxygen is discharged, in a combination of microbubbles and macrobubbles, into a membrane bioreactor (“MBR”). The mixture of bubbles is preferably generated with coarse (>2 mm) and fine (m3/day.
대표청구항▼
A process for treating organic liquid waste generated on-board a host marine vessel, utilizing a membrane-bioreactor system, said process comprising, (a) feeding an aqueous suspension of said liquid waste comprising black water, grey water, and oily water to a bioreaction zone containing live microo
A process for treating organic liquid waste generated on-board a host marine vessel, utilizing a membrane-bioreactor system, said process comprising, (a) feeding an aqueous suspension of said liquid waste comprising black water, grey water, and oily water to a bioreaction zone containing live microorganisms adapted to digest said liquid waste; (b) flowing activated sludge withdrawn from said bioreaction zone, to a membrane filtration zone at a velocity and pressure sufficient to maintain a predetermined membrane flux in said zone, at which flux essentially no solids are retained on the surface of said membrane having a predetermined molecular cut-off which will permit passage of only molecules smaller than 500,000 Daltons; (c) separating water which is essentially solids-free, as a permeate, from a solids-containing concentrate, and removing the permeate from said membrane filtration zone; (d) flowing said concentrate from said membrane filtration zone into a gas micronizing zone comprising a microporous air diffuser element without introducing additional energy into said concentrate until it is introduced into said micronizing zone; (e) introducing said concentrate axially into said micronizing zone, while discharging into said zone a gas containing at least about 20% oxygen under pressure in the range from about 150 kPa to about 1000 kPa so as to incorporate micronized gas bubbles having an average diameter in the range from about 1 m1000 m2 mm in diameter, with enough energy to maintain a desirable recirculation pattern in said reaction zone; and, at the same time, directing said first tail-jet into said bioreaction zone so as to maintain an average liquid velocity of at least 03. meter/sec within said bioreaction zone while also maintaining said recirculation pattern therein; whereby an adequate hydraulic retention time, based on flow of said liquid waste, and solids retention time is obtained to retain soluble organics greater than said molecular weight cut-off in said reaction zone for a period at least 10 times longer than the hydraulic retention time based on liquid waste flow.
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