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When anaerobic bacteria convert the sewage to an inert sludge, .
A.no oxygen is needed
B.oxygen is necessary
C.oxygen is given off
D.no gas is produced
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更多 “ When anaerobic bacteria convert the sewage to an inert sludge, .A.no oxygen is neededB.oxygen is necessaryC.oxygen is given offD.no gas is produced ” 相关考题
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When a person breathes in TB bacteria, the bacteria can settle in the stomach and begin to grow. ()
此题为判断题(对，错)。
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Theois designed with a primary combustion chamber for burning sludge oil and ／or solid waste, and two secondary combustion chambers for9ases.burning uncombusted exhaust
A.boilerB.separatorC.incineratorD.treatment lological sewage
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Most marine biological sewage treatment plants consist of all the following statements except()
A.aeration tanksB.settling tanksC.disinfection agent(消毒剂D.anaerobic bacteria(厌氧菌)
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第三组：The sewage treatment system must be capable of discharging an effluent that comes within the limits of the tests. Sewage can be treated biologically so that it may be discharged with minimal damage to ecosystem. Biological treatment involves the use of living organisms to treat the sewage within the sewage treatment plant so the liquids and sludge discharged are within the standards specified.Biological treatment plants are usually built up as a module and consist of various sections.Waste matter collected from the ships sanitary appliances is led through a sanitary piping system to the treatment module. The solid matter is broken up by passing it through a screen or a series of revolving cutters. The broken up solid material, together with the waste liquid, passes into a tank containing bacteria which require oxygen and a nutrient to propagate. The nutrient is contained in the solid waste material, and oxygen is supplied by bubbling compressed air through the broken up waste. The propagated bacteria change the waste material into a sludge by aerobic digestion. The sludge is finally treated to kill the coliform. bacteria before it is passed overboard.When a biological sewage plant is started up, such as when activating a new ship or after cleaning out the tank, a pellet containing bacteria is introduced into the tank. It takes approximately one week for the bacteria to propagate and make the system fully effective. The choice of sanitary appliance cleaners requires extreme care, as many cleaners are toxic to the active bacteria. Once a biological sewage plant is made active it should not be shut down. If it is it will have to be reactivated again because the bacteria will die without a supply of nutrients and oxygen.Bacteria that require oxygen for their survival are referred to as aerobic. Aerobic bacteria are normally used in ships sewage treatment equipment. Other forms of bacteria that do not require oxygen are referred to as anaerobic. Anaerobic bacteria are used in shore based sewage treatment works where methane is obtained as a by-product for use as fuel.This passage is mainly aboutA.sewage treatment methodsB.the various sections of a sewage treatment plantsC.biological sewage treatment systemD.how the sewage treatment plants are started up
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Most marine biological sewage treatment plants consist of all the following statements except ______.A.aeration(通风) tanksB.settling tanksC.disinfection agent(消毒剂)D.anaerobic bacteria(厌氧菌)
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Which of the listed functions is the purpose of a gas scrubber in an inert gas generation system ________．A.Cools the inert gasB.Maintains the oxygen content at 5% by volumeC.Drains off static electricity in the inert gasD.Maintains the water seal on the gas main
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Inerting means ______．A.The introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volumeB.The introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volumeC.The introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargoD.All of the above
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Using an inert gas system on a tanker has which advantage（s）________．A.Provides for faster loadingB.Lowers oxygen content in the tankC.Provides better fuel economyD.All of the above
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When the inert gas pressure is being ______ in the cargo tanks，particular attention should be paid to obtaining an oxygen concentration．A.topped upB.bracedC.tommed downD.shored
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Which statement about the inert gas system is TRUE ________．A.Boiler soot blowers should never be used when the IG system is operatingB.The boiler will produce the best quality of flue gas for the IG system when the boiler load is very lightC.The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very lightD.Flue gas with excessive oxygen content is de-oxygenated in the scrubber
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An inert gas system is designed to reduce the possibility of tank explosions by ______.A.eliminating sparks and fire in the vicinity of cargo tanksB.removing all hydrocarbon gases from the cargo tanksC.blanketing cargo tanks with inert foamD.reducing the oxygen concentration below levels necessary for combustion
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单选题The purpose of inert gas systems aboard tank vessels is to（）.A
allow sufficient oxygen in the tank to sustain lifeB
prevent outside air from entering the tankC
provide increase in cargo discharge pressureD
comply with double hull pollution prevention regulations
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问答题It was because he was in a very watery environment, safe from the bacteria that need oxygen to live.
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单选题When does auxiliary burner of incinerator put into operation? （） Ⅰ. start incinerator when it is cold Ⅱ. the sludge for dealing with is little Ⅲ. the sludge for dealing with is large Ⅳ. the water and impurity in sludge are too much Ⅴ. the temperature in incinerator is low Ⅵ. dealing with little solid rubbishA
Ⅰ+Ⅱ+Ⅲ+ⅤB
Ⅰ+Ⅱ+Ⅲ+ⅣC
Ⅰ+Ⅳ+Ⅴ+ⅥD
Ⅰ+Ⅱ+Ⅲ+Ⅵ
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单选题When does auxiliary burner of incinerator put into operation? （） Ⅰ.tart incinerator when it is cold Ⅱ.he sludge for dealing with is little Ⅲ.he sludge for dealing with is large Ⅳ.he water and impurity in sludge are too much Ⅴ.he temperature in incinerator is low Ⅵ.ealing with little solid rubbishA
Ⅰ+Ⅱ+Ⅲ+ⅤB
Ⅰ+Ⅱ+Ⅲ+ⅣC
Ⅰ+Ⅳ+Ⅴ+ⅥD
Ⅰ+Ⅱ+Ⅲ+Ⅵ
考题
单选题The purpose of inert gas systems aboard tankers is to（）.A
allow sufficient oxygen in the tank to sustain lifeB
prevent outside air from entering the tankC
provide more discharge pressureD
comply with pollution regulations
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单选题An inert gas system is designed to reduce the possibility of tank explosions by（）.A
eliminating sparks and fire in the vicinity of cargo tanksB
removing all hydrocarbon gases from the cargo tanksC
blanketing cargo tanks with inert foamD
reducing the oxygen concentration below levels necessary for combustion
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单选题It is that reduce the BOD by converting the organic content of the sewage to a chemically and organically inert sludge（）A
the bacteriaB
oxygenC
oxidizing functionD
agitation function
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单选题When anaerobic bacteria convert the sewage to an inert sludge,（）A
no oxygen is neededB
oxygen is necessaryC
oxygen is given offD
no gas is produced
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单选题（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.A
anaerobic bacteriaB
aerobic bacteriaC
air bubblesD
disinfection chemicals
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单选题Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）A
the plant should be prohibited to supplying airB
the plant should work at intervalsC
the plant should be added disinfector in timeD
we should check strength of activated sludge, ivory-white color is best
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单选题Most marine biological sewage treatment plants consist of all the following statements except （）.A
aeration tanksB
settling tanksC
disinfection agentD
anaerobic bacteria
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单选题Inerting means（）.A
the introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volumeB
the introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volumeC
the introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargoD
All of the above
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单选题SOLAS regulations require that the inert gas system shall be capable of delivering inert gas with an oxygen content of not more than what percentage?（）A
5%B
8%C
6%D
3%
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单选题What alarm is NOT found on an inert gas system? （）A
Low oxygen alarmB
Low pressure alarmC
Scrubber high water level alarmD
Deck seal low water alarm
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填空题UASB是（）（Upflow Anaerobic Sludge Blanket)的简称，主要有进水和配水系统、（）和（）。
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