CN102215926B

CN102215926B - Marine wastewater treatment

Info

Publication number: CN102215926B
Application number: CN2009801459981A
Authority: CN
Inventors: 鲁道夫·C·马陶谢克; 丹娜·凯斯毕尔; 戴维·希尔; 鲁宾·巴里亚
Original assignee: SEV TRENT DE NORA LLC
Current assignee: De Nora Water Technologies LLC
Priority date: 2008-11-19
Filing date: 2009-11-19
Publication date: 2013-09-25
Anticipated expiration: 2029-11-19
Also published as: BRPI0916079B1; KR101379705B1; KR20110095379A; JP5281693B2; WO2010059208A1; JP2012509170A; CN102215926A; BRPI0916079A2

Abstract

Methods and systems for treating wastewater. Wastewater slurry collected in a tank is routed by a macerator pump. The macerated slurry is piped to an electrolytic cell to oxidize and disinfect it. The slurry is then piped to an electrocoagulation cell. Suspended solid particles are flocculated in the electrocoagulation cell. The flocculated slurry is routed to a primary settling tank for separation of sludge and a substantially clarified supernatant. The supernatant is piped to a secondary clarifying tank to facilitate further separation of the sludge. The sludge is discharged to a sludge collection tank. The turbidity levels of the sludge discharged is continually monitored. When the turbidity level equals a pre-determined low value, the sludge discharge is stopped. The substantially clarified supernatant may be discharged as an effluent following dechlorination.

Description

Marine wastewater treatment

Technical field

Present invention relates in general to wastewater treatment, particularly the in-situ processing of marine waste water and purification.

Background technology

The in-situ processing of waste water is generally being used for the limited place of the arrival of municipal water processing plant or facility of equal value.The example in this class place comprises boats and ships and offshore drilling platforms.In such place, waste water flow through usually biology or the fermentation unit of boat-carrying enter holding tank then.When the effluent in the holding tank reaches specified level, it can be pumped to the sterilization unit.

The subject matter of the in-situ processing of waste water is to reduce BOD (BOD), COD (COD), and is suspended in the particulate matter in the water, i.e. total suspended solid (TSS).Even such particle is flooded, carry out the degraded of biology or fermented type afterwards again, it also is less such particulate matter can being reduced to the situation that can be considered environmentally safe restriction.

Summary of the invention

One or more embodiment of the present invention relates to the method and system for the treatment of the waste water of boat-carrying on marine ships and/or the static offshore platforms.In one embodiment of the invention, a kind of method for the treatment of waste water comprises that the dirty slurry of pumping waste water is in waste water collection tank.Waste water comprises raw sewerage, Heisui River, buck, garbage and combination thereof.The dirty slurry of waste water also comprises the solid particle of suspension, organic and inorganic substances, bacterium and entrained gas.Be installed in the waste water liquid level in the exhausted water level sensor supervision waste water collection tank in the waste water collection tank.When the higher thresholds liquid level that reaches predetermined was starched in the waste water dirt, what this sensor-triggered was operated began automatically.In the time of under the waste water liquid level is fallen predetermined low threshold value liquid level, stop the dirty slurry of pumping waste water.The dirty slurry of waste water transmits to flood SS by the dipping pump.During dipping, solid particle is carried out fine gtinding, thereby produce the particle of the reduced size with large surface area.Can turn to and get back to waste water collection tank through flooding dirty slurry stream.With starching with pipeline transmission to electrolytic cell through flooding dirt of remainder.The seawater of electrolytic cell use controlled volume or salt solution are to carrying out oxidation and sterilization through flooding dirty slurry.Because the particle of meticulous dipping has bigger surface area, in electrolytic cell to being significantly improved through flooding oxidation and the sterilization that dirty slurry carries out.Before will coagulating the pond with pipeline transmission to electricity through the dirt slurry of oxidation and sterilization, defoamer is added to wherein.Suspended solid through sterilization can coagulate caking or flocculation in the pond at electricity.The dirt slurry of flocculation is sent to the supernatant that the primary precipitate groove contains wadding mud and clarifies basically with separation.The supernatant of clarification basically is piped to the supernatant of second defecator to help further separated sludge and to clarify basically.Mud from stillpot and defecator is also discharged at the bottom precipitation of groove.Monitor the turbidity level of the mud of discharging continuously.When turbidity level equal to be scheduled to than low value the time, automatically close valve on the mud discharge pipe to stop the discharge of mud.Basically Cheng Qing supernatant can be used as and handles back effluent discharge.

Turn to get back in the waste water collection tank through flood dirty slurry stream can with this feeder in the dirty slurry of waste water mix.This keeps the homogeneous in the waste water collection tank to mix.In one embodiment, mixing pump can be starched stream and the dirty slurry of the waste water in the waste water collection tank to mix continuously and to recycle through the dirt of dipping adjacent to dipping pump location.

The seawater of controlled volume can mix with the dirt slurry of dipping when entering electrolytic cell.The volume of the seawater of introducing can depend on the concrete disposal ability of marine Waste Water Treatment.Can be by in the inner electrochemical reaction that takes place of electrolytic cell the dirt slurry through dipping being carried out oxidation and sterilization.In one embodiment of the invention, the dirt slurry through dipping can contact with the oxidant in the electrolytic cell.

To be delivered to electricity through the dirt slurry of oxidation and sterilization coagulates in the pond so that the solid through flooding and other suspended solid caking.Electricity coagulates the pond and can flow with the waste water that metallic particles strengthens through sterilization, and metallic particles can serve as nucleation site and organic substance forms flocculation.Along with continuous use, the electrode that electricity coagulates in the pond can be covered by solid particle and flocculate.In one embodiment of the invention, termly electricity is coagulated the pond and carry out automatic empty G﹠W cleaning.Cleaning can wash away the particulate pollutant of covering from electrode.To clean content and be piped to the primary precipitate groove.

Before the supernatant of discharging clarification basically, can handle so that residual chlorine is neutralized to it with one or more chemical substances and be lower than 0.5mg/L.In one embodiment of the invention, use measuring pump that the reducing agent of optimal amount is injected the supernatant of clarification basically.This reducing agent can be selected from sodium hydrogensulfite, sodium sulfite, sodium thiosulfate and sulfur dioxide.

In one or more embodiments of the present invention, the effluent of discharge can comprise the BOD (BOD) that is lower than 25mg/L, the total suspended solid (TSS) that is lower than 35mg/L, the COD (COD) that is lower than 120mg/L and the Escherichia coli that are less than 100cfu/100ml.

In another embodiment of the invention, will from electricity coagulate the dirt slurry of flocculation in pond and the mud of during the empty G﹠W of automation cleans, removing and particulate pollutant with pipeline transmission to degas chamber.The gas that produces during the cell reaction and other residual gas of emitting from dirt slurry are by diluted with ambient air and be discharged in the atmosphere.Can use hair drier to force surrounding air to enter breather pipe.

In another embodiment of the present invention, can be discharged in the polymeric kettle leaving the electric dirt slurry that coagulates the flocculation in pond.One or more cationic polymers can be incorporated in the dirt slurry of flocculation to form the caking solid group of assembling.Can use filter element to filter the caking solid group of assembling.

In another embodiment of the present invention, a kind of system for the treatment of waste water comprises waste water collection tank, can grind the dipping pump of the solid that is suspended in the waste water, mixing pump adjacent to the dipping pump, (this electrolytic cell comprises reative cell to electrolytic cell, be positioned at the anode and the negative electrode that is positioned at reative cell of reative cell, and for the device that electrolytic cell is provided electric power), the electricity that is communicated with the electrolytic cell fluid coagulates the pond, coagulate the stillpot in pond adjacent to electricity, be connected to the defecator of stillpot, nephelometer for detection of the turbidity level of the mud of discharging, the dechlorination unit that comprises chemical substance injection pump or measuring pump, and effluent excavationg pump.In one embodiment of the invention, stillpot is connected to degas chamber.This degas chamber comprises that hair drier and ventilation unit are to allow to discharge the gas that produces of dilution during electrolysis.In one embodiment of the invention, optional mud feeder is positioned at stillpot and defecator below.

In one embodiment of the invention, Waste Water Treatment comprises the rigid foundation framework, wherein said rigid foundation chassis configuration and the weight that is arranged as to carry Waste Water Treatment.In another embodiment of the present invention, Waste Water Treatment comprises and is connected to air and the aqueous cleaner that electricity coagulates the pond.In another embodiment of the present invention, the sea water supply source is connected to electrolytic cell.

Description of drawings

Fig. 1 illustrates the flow chart of Waste Water Treatment according to embodiments of the present invention.

The specific embodiment

Each claim of the application limits an independent invention, be to differentiate the purpose of infringement, this invention be considered as comprising with claim in the various elements put down in writing or the equivalence of restriction.Depend on context, hereinafter can only refer to specific specific embodiments to quoting in some cases of " the present invention ".In other cases, can be understood as and refer to one or more but whole theme of claims record not necessarily to quoting of " the present invention ".

Various term used herein illustrates below.Scope for the term that uses in the claims limits hereinafter, tackles it and provides the wideest definition, and such being defined in when submitting the application provided term by those skilled in the art, be reflected in the open file of printing and the patent issued in.

Embodiment of the present invention relate to the method and system for the treatment of the marine waste water of boat-carrying on boats and ships and/or the static offshore platforms.As used herein, term " boat-carrying (onboard) " refers to purify (than handling such water away from the place that produces the place, such as municipal water processing plant) in the same facility that produces waste water.

Fig. 1 illustrates concrete non-limiting embodiments, and the system 10 for the treatment of marine waste water of boat-carrying on marine ships or the static offshore platforms is shown.System 10 comprises that waste water collection tank 12, dipping pump 14, mixing pump 13, electrolytic cell 16, electricity coagulate pond 18, stillpot 22, defecator 24, the dechlorination unit 28 that comprises chemical substance injection pump 29 and effluent excavationg pump 30.In Waste Water Treatment 10, waste water is handled and purified.Waste Water Treatment 10 is supported and is arranged on the public rigid base (not shown).After purifying, the effluent 64 through dechlorination can be discharged to open water from marine ships.One or more embodiment of the present invention can produce have the Escherichia coli that are no more than 100cfu/100ml, the dechlorination wastewater effluent of the COD (COD) of the BOD (BOD) of the total suspended solid (TSS) of 35mg/L, 25mg/L and 120mg/L.The disposal ability scope of marine Waste Water Treatment 10 can be 3.0 to 65.0 cubic metres/day.This sea Waste Water Treatment 10 can need little installation floor space or have little system's floor space (footprint).Marine waste water system 10 can 24 (hour) * 7 (my god) work, collect and handle the waste water of collection continuously.In one embodiment of the invention, marine Waste Water Treatment 10 can automatically be worked under limited operator intervenes.

Marine waste water stream comprises sewage, Heisui River, buck and combination thereof usually.As used herein, term " Heisui River " refers to be included the water that the slop of Escherichia coli and other bacterium pollutes.As used herein, term " buck " refers to not have the excremental used water of human body, such as the water from tank and shower.Usually, marine waste water by poisonous and nontoxic organic and inorganic pollution, comprise the little and big suspended solid pollutant of cellulose, sand, gravel, human-body biological matter and emulsion and gas composition.A kind of in the composition of the most often measuring in the waste water is biochemical oxygen demand or BOD.The required oxygen amount of microorganism decomposing organic pollutant is called as biochemical oxygen demand or BOD.Five days BOD or BOD ₅Measure by the oxygen amount that during five days, is consumed by microorganism, and be the most common tolerance of biodegradable organic quality or sewage intensity in the sewage.The sewage that BOD is high may exhaust the oxygen that receives in the waters, causes fish kills and the ecosystem to change.

The wastewater treatment of boat-carrying is used in those the limited positions of acquisition to the facility of municipal water processing plant or equivalence usually.The example of such position is boats and ships and offshore drilling platforms.

Get back to Fig. 1, the dirty slurry of waste water is carried 50 in waste water collection tank 12 with pipeline.Waste water collection tank 12 comprises that exhausted water level sensor (not shown) is to determine the waste water liquid level.When Waste Water Treatment 10 was set at automatic mode and reach predetermined threshold value liquid level, this liquid level sensor can automatically be initiated the beginning of Waste Water Treatment 10 and be stopped sequence.In another embodiment, can manually begin wastewater treatment.

When liquid level sensor detected waste water in the waste water collection tank 12 and reaches predetermined higher thresholds liquid level, the dirty slurry of waste water can transmit 52b by dipping pump 14.Solid during dipping pump 14 grinds subtly and is suspended in that waste water is dirty and starches is to reduce its particle size.The particle that reduces has significantly bigger area in the dirt slurry.Dirt slurry stream through flooding can turn to gets back to 53 waste water collection tank 12.Through flood dirty slurry stream continuously with waste water collection tank 12 in the dirty slurry of waste water mixes with the formation uniform homogeneous blend.Mixing pump 13 is adjacent to dipping pump 14 location.The dirty slurry of waste water and the dirty slurry of the waste water through flooding can transmit 52a by mixing pump 13.Mixing pump 13 works to recycle the dirty slurry of waste water and the dirty slurry of the waste water through flooding in 51 waste water collection tank 12 continuously, thereby keeps the waste water mixture of homogeneous.

With remainder be piped to electrolytic cell 16 producing the harmless dirt slurry through oxidation and sterilization through flooding dirty slurry 54 by the calibration orifice plate, and therefore do not need the operator to be exposed under the dangerous bacterium such as Escherichia coli.Electrolytic cell 16 can comprise reative cell, is positioned at the anode of reative cell, is positioned at the negative electrode of reative cell, and is used for transmitting between anode and negative electrode galvanic device.Can expect that any electrolytic cell well known by persons skilled in the art can be as the electrolytic cell in the embodiment described herein.

Through the dirt slurry of dipping can be in electrolytic cell 16 catalytic oxidation agent source to carry out disinfection and to neutralize and reduce BOD appearing at wherein Escherichia coli.Because the particle through dipping has bigger surface area in electrolytic cell 16, oxidation and sterilization significantly are enhanced.In one embodiment of the invention, oxidant can be by seawater or salt water generates.Occurring when the dirt of dipping is starched, can producing this oxidant by electrolytic cell 16 by transmitting seawater 55.The seawater of controlled volume can be in the time by the calibration orifice plate dirt slurry 54 through dipping being pumped into electrolytic cell 16 mixes with starching through the dirt of dipping, perhaps can be incorporated into individually in the electrolytic cell 16 by filter and the flow controller (not shown) seawater with controlled volume.This flow controller is restricted to predetermined value based on the concrete disposal ability of Waste Water Treatment 10 with seawater flow.

Seawater can be starched through the dirt of dipping by the ratio contact at least about 1: 1.In alternate embodiment of the present invention, can mix with starching through the dirt of dipping with saline solution, this saline solution comprises and has the water that is enough to the salt finishing electrolysis and form oxidant.In dirt when slurry of contact through dipping, oxidant provides the reactant mixture of the pH value that for example has about 6 to about 9 pH value or about 6.5 to about 8.

Can carry out oxidation and sterilization to the dirt slurry through dipping by the electrochemical reaction in the electrolytic cell 16.This electrochemical reaction is the result of DC voltage that custom-designed anodes in the electrolytic cell 16 and minus plate (electrode) are applied.The dirt slurry of carrying by pipeline from dipping pump 14 54 through dipping flows between charged electrode.Seawater provides sodium chloride and water and is used as the electrolyte of the DC current between anode and minus plate.Villaumite in the seawater by electrolytic decomposition to form the mixed oxide of clorox and trace.Electrochemical reaction and the oxide that produces can be killed at harmful Escherichia coli and oxidation of organic compounds in flooding dirty slurry.Once can kill almost 100% the residual bacterium that appears in the waste water and the organic compound of oxidation 90% to 95% by electrolytic cell 16.

Operation electrolytic cell 16 required electric power come from the inside dc source of marine Waste Water Treatment 10.One or more embodiments of marine Waste Water Treatment 10 have the specific fixed current that is associated with electrolytic cell 16.The galvanic amount that puts on electrolytic cell 16 determines the amount of the clorox of generation.During electrolysis, a spot of hydrogen and other gas also can produce as byproduct.Gas can be from emitting or be entrained in wherein through the dirt slurry of oxidation and sterilization.

In another embodiment of the present invention, oxidant can continue and another container, such as contacting through flooding dirty slurry in pipeline or the groove (not shown).Time of contact can be for example few to 2 minutes.

The residual oxidant that can comprise minimum through the dirt slurry of oxidation and sterilization.In one embodiment, the dirt slurry through oxidation and sterilization can comprise that about 1mg/L is to the residual oxidant of about 250mg/L and residual chlorine.

In another embodiment of the invention, can carry out oxidation to the dirt slurry through dipping by any method known to those skilled in the art, such as the dirt slurry through dipping is contacted with ozone.It should be noted that the oxidation of carrying out in the oxidation pond can utilize the stronger oxidant of oxidant that utilizes than in electrolytic cell 16.

To be transported to electricity by pipeline through the dirt slurry 56 of oxidation and sterilization and coagulate pond 18.Dirt slurry through oxidation and sterilization is carried out electrolysis-coagulation, cause the solid particle flocculation or the caking that are suspended in wherein.Electricity pond with fixed attention is known in the prior art and can uses various anodes and negative electrode geometry, comprises battery lead plate, ball, fluid bed spheroid, woven wire, bar and flexible pipe.Electricity coagulate process based on the principles of science relate to oxidation that the contaminated wastewater thing induces for forceful electric power and the response of reduction reaction.This process can be removed and surpass some heavy metal cations of 99% and can electricity kill microorganism in the water.This process also makes charged colloidal precipitation and removes a large amount of other ion, colloid and emulsion.

Electricity coagulates pond 18 can be coordinated to use with electrolytic cell 16.In one embodiment, electricity can be operated in arranged perpendicular in pond 18 with fixed attention.This allows gas to overflow, and the gas lift of coagulating pond 18 by electricity is provided simultaneously, is used for the flowed fluctuation of minimizing and the operating voltage of minimizing.

In one embodiment of the invention, by battery lead plate introduce DC current to electricity coagulate collect in the pond 18 in the dirts slurry of oxidation and sterilization.Electrode can be made by iron or aluminium.Metal ion breaks away from electrode and enters through the dirt of oxidation and sterilization to be starched.These metal ions can form metal oxide, and these metal oxides attract unsettled solid particle in the electric mechanical mode.When this takes place, the electrically charged entity of solid form will lump or flocculate and can separate with supernatant.Residual chlorine in the dirt slurry electrolytically can also be destroyed at electricity and coagulate in the pond 18.

Some solid particles and pollutant can coagulate accumulation in the pond 18 at electricity along with the time.In one embodiment of the invention, electricity can be connected to air washer 17a and aqueous cleaner 17b in pond 18 with fixed attention.Can clean the electric pond 18 of coagulating to wash away the particulate pollutant of accumulating on the electrode with air cleaning 57a, the water cleaning 57b of automation or the combination 57c of empty G﹠W cleaning termly.The empty G﹠W of the combination of automation cleans 57c can carry out in each cycle period of being filled or recharged by the dirty slurry 50 of waste water when waste water collection tank 12, or carried out during the normal operating of Waste Water Treatment 10.Cleaning can be carried out forward and backward on each direction in brief predetermined amount of time.To clean content 58 and redirect to degas chamber 20.

Can enter at the dirt slurry through oxidation and sterilization before the electric pond 18 with fixed attention, a spot of defoamer 67 is added in the dirt slurry of oxidation and sterilization to minimize or to eliminate the foam in the primary precipitate groove 22.Defoamer can also help to remove the gas in the dirt slurry that leaves the electric flocculation in pond 18 with fixed attention.

The dirt slurry 58 of flocculation is piped to degas chamber 20.Degas chamber 20 utilizes known falling liquid film technology to assist in removing residual gas.In one embodiment of the invention, use hair-dryer to force surrounding air 61 to enter the breather pipe of degas chamber.The gas that produces during this diluted with ambient air residual gas and the electrolysis.The air 65 of dilution is discharged in the atmosphere.Enter stillpot 22 through the dirty slurry of the flocculation of the degassing, wherein contain wadding sludge settling or precipitable in the bottom.

Because the solid of mud or caking is heavier, its supernatant with clarification basically separates and is deposited in the bottom of stillpot 22, the upwards displacement of the supernatant of feasible clarification basically.Mud 59a can be discharged to optional mud feeder (not shown).Basically Cheng Qing supernatant 60 can be delivered in the defecator 24 that is communicated with stillpot 22 fluids.The supernatant that can allow to clarify basically further precipitates in defecator 24.Can allow residual sludge settling in defecator 24 bottoms.Residual mud 59b can also be discharged to optional mud feeder.

Stillpot 22 and defecator 24 all have sidewall 22a, the 24a of pair of angled or taper.Heavier mud glides and is deposited to groove 22,24 bottom along sidewall 22a, 24a.Both also comprise the bottom opening that is connected to discharge pipe stillpot 22 and defecator 24.These discharge pipes can be united, and associating or public discharge pipe can extract or remove in stillpot 22 and the defecator 24 the mud 59c of flocculation.

Extracting of mud 59c can be by the one or more valve controls in the public discharge pipe.When optimum low value that the turbidity level of the mud of discharging equals to be scheduled to, can automatically close this valve and stop further mud 59c and discharge.

Get back to Fig. 1, in one embodiment of the invention, nephelometer 26 is installed on the public discharge pipe.Transmissometer or nephelometer are measured clarification of water degree or turbidity.Turbidity is the water characteristic of the gathering that caused by the suspended particulate in the water.Under high concentration, turbidity can be perceived as muddiness in the water, be vaporific or do not clarify.Nephelometric analysis is the optical measurement to scattered light.When light passed through water sample, the particle in the light path changed direction of light, makes light generation scattering.If turbidity is lower, most of light will continue at inceptive direction.Allow to detect particle in the water by the light of particle scattering.When the nephelometer 26 on being installed in public discharge pipe detected the low scale of programming in advance, the valve on the public discharge pipe automatically cut out.This will stop further mud 59c and discharge.Can make up to form the total solid waste streams of 2-3wt% with the mud from stillpot 24 from the mud of defecator 24, it will be shed from Waste Water Treatment 10 by system operator.Basically Cheng Qing supernatant 62 can be used as the effluent discharge of treated or sterilization.

In another embodiment of the present invention, mud 59c can be discharged to polymeric kettle or container (not shown) and be collected.Can be manually or cationic polymer is entered in the polymeric kettle.But this polymer can promote the dehydration property of the mud that flocculates, produces one or more big polymerization groups.These big polymerization groups can comprise from 8% solid to the higher percentage more than 25%.Compare with the mud of flocculation drying and have the weight that reduces of polymerization group.Advantageously, comprise that the volume of the mud that polymerization is rolled into a ball can reduce as many as 75%, and then can reduce and and handle and dispose the related cost of effluent.Can in the filter element (not shown), filter polymerization group.

Filter element can comprise that multi-drop filters and drying unit.Filter and drying unit is for easily and handle the compact unit of the granular wastes that catches safely, this is different from existing Waste Water Treatment, the latter need a plurality of equipment so that identical final result to be provided.In one embodiment, multi-drop filtration and drying unit comprise the support grid of the filter bag that is configured to suitable multiple industrial standard.Comprise introduce fluid to be processed in filter bag, fluid dehydration, one or more processes of compression and dry particulate matter are filtered and the operation of drying unit is the scene realization for multi-drop.Multi-drop filters and drying unit comprises that also special filter bag is removed or the discharging station, is used for removing comprising polluting but drying and do not have the filter bag of liquid of compressing grains material.By using transparent cover and safety interlock mechanism to discharge station operation lid at filter bag, the operator is controlled to the exposure of the bio-hazard of waste water disposal facility inherence.Removal has been polluted or has also been replaced with clean filter bag with the filter bag of crossing when multi-drop filtration and drying unit work.

In yet another embodiment of the present invention, mud 59c can be discharged to the centrifugal unit (not shown).Can centrifugally realize solid/liquid separation and do not need to add polymer so that particle aggregation and then filter by using.The solid (solid of 2-3wt%) that comprises caking from the sludge stream 59c of stillpot 22 and defecator 24 discharges, and because it is enough heavy, can in centrifuge, make its further with gap moisture to form two streams that separate: lack the liquid stream of solid and have mud greater than the solid of 10wt% relatively.The solid effluent is regarded as inanimate object harm and it can merge with normal rubbish/waste material then.Can use special inside scraper from centrifuge, to remove solid physically and solid is fallen in the container.This container can comprise the waterproof board for operation.Centrifugal unit can remove solid in batch mode and it can also comprise the recycle tank of the inlet flow that 2-3wt% is provided.

Get back to Fig. 1, Waste Water Treatment 10 can also comprise dechlorination unit 28.Dechlorination unit 28 comprises chemical substance injection pump or measuring pump 29.Can carry out dechlorination to the supernatant of clarifying basically 63 by one or more chemical substances of adding optimal amount.In one embodiment; sodium hydrogensulfite, sodium sulfite, sodium thiosulfate or sulfur dioxide can be injected into finite concentration in the supernatant 63 of clarification basically by measuring pump 29, and chlorinity satisfies International Maritime Organization about further not handling the requirement of the resolution MEPC159 (55) that just is discharged into the effluent in the marine environment in the effluent that this concentration is guaranteed to clarify basically.Through the effluent of dechlorination can be Environmental security and do not have residual chlorine basically.Effluent through dechlorination can be discharged to outboard with gravity by pipeline.As shown in Figure 1, system 10 can comprise that the centrifugal overboard pump 30 of stainless steel will be discharging 64 to outboard through the effluent of dechlorination.The effluent of discharging can comprise the Escherichia coli, the BOD that is lower than 25mg/L that are lower than 100cfu/100ml, be lower than the COD of 120mg/L and be lower than the TSS of 35mg/L.

Test result:

In the wastewater treatment plant in Texas Kai Di city, carry out the test of land.The Kai Di city is in the suburb of Houston.This factory handles 3.2 hundred ten thousand gallons (MGD) every day, and heap(ed) capacity is 13.3MGD.Marine Waste Water Treatment is being worked under the condition of following files specify: the test procedure that the Marine Environmental Protection Committee (MEPC) of International Maritime Organization (IMO) adopts in the international effluent standard of resolution MEPC.2 (VI) sewage disposal plant performance test in 1976 and guide are recommended, and the revision of employing among the MEPC.159 (55) on October 13rd, 2006.The all operations of this system is carried out by trained personnel.Proper handling to this system during 12 test days is carried out with monitoring by these identical personnel.System's operation and laboratory result are by independently third company's checking (in this case, by Bureau Veritas (Bureau Veritas) checking).

These tests are carried out under specific sewage quality.Inflow (A) is the fresh sewage of being made up of excreta, urine, toilet paper and the water of flushing the toilet, and adds the sewage that mud has minimum total suspended solid concentration with acquisition therein, and it is suitable for personnel amount and the liquid load of sewage disposal plant authentication.Waste Water Treatment after tested is designed for 13.6 cubic metres/day liquid load.The duration of test phase be 12 days to obtain all situations.After reaching limit, Waste Water Treatment obtains sample and operating data.

Sewage with quality of requirement is provided and is input to continuously this Waste Water Treatment by the waste water treatment plant.232 samples are obtained in accordance with regulations interval in 12 days; 94 samples are used for determining colibacillus of excrement concentration (half flows into half outflow), and 138 samples (half flows into half outflow) are used for determining TSS, BOD5, COD, pH and chlorine.The colibacillus of excrement sample respectively one day twice by express delivery pass to northern water area laboratory service company (NWDLS-North Water DistrictLaboratory Services, thus Inc.) can execution analysis in 8 hours of sample collection time.The sample that is used for other analysis can be once a day by being delivered to NWDLS soon.All sample collections and transmission all meet the standard Chain of Custody.NWDLS is admitted by Environmental Protection Agency USA (EPA-United StatesEnvironmental Protection Agency), and is approved by American National environmental laboratory certified variety (National Environmental Laboratory Accreditation Program) and Texas Council on Environmental Quality (Texas Commission on Environmental Quality).

The inflow of whole test satisfies the requirement of resolution MEPC.159 (55).Shown in following table 1, the geometrical mean of TSS is that the minimum of a value of 888.6mg/L and test in whole 12 days is 618.0mg/L.

After handling waste water according to one or more embodiments of method mentioned above, check is through the effluent (B) of dechlorination.This effluent satisfies the criterion of resolution MEPC.159 (55).This effluent represents to leave the outboard effluent of wastewater treatment process.Shown in following table 2, the geometrical mean of colibacillus of excrement is that every 100ml has 8.7 CFUs, far below desired geometrical mean 100.Other of system's effluent analyzed shown in the table 2, and confirmed that the geometrical mean of TSS is 16.3mg/L, the COD value is that 30.3mg/L, BOD5 value are 7.5mg/L, and the pH value is 7.0, and in 6.1 to 7.7 scope, and chlorine is in 0.01 to 0.40 scope.These results satisfy the criterion of MEPC.159 (55).

Though do not illustrate in this article, can revise wastewater flow based on system optimization, as long as this modification meets the principle of the present invention that limits as claim.Can in whole process described herein, use additional treatment facility, such as pump, pipeline or additional electrolytic cell or filter element.

Can expect that embodiment described herein can such as marine ships, comprise on naval vessel and the platform and using at for example Offshore Units.For a lot of commercial application, the watertight part (tightquarters) in the Offshore Units is even make that usually the installation of Waste Water Treatment may be also difficult.Yet embodiment of the present invention also provide the cleaning system with less floor space and overall dimensions, thereby alleviate the misgivings of installation aspect.

Though above relate to embodiment of the present invention, can find out of the present invention other and not break away from base region of the present invention with further embodiment, and scope of the present invention determined by the application's claim.The invention is not restricted to described embodiment, version or example, comprise that herein these contents are in order to allow those skilled in the art to implement and use the present invention in conjunction with the information in the disclosure and information available and technology the time.

Claims

1. method for the treatment of marine waste water, described method comprises:

The waste water waste slurry pump is delivered in the waste water collection tank, and described dirty slurry comprises SS, organic and inorganic substances, bacterium and entrained gas;

Detect the predetermined higher thresholds liquid level that the dirt in the waste water collection tank is starched in response to the exhausted water level sensor, automatically begin to transmit dirty slurry to flood by the dipping pump;

To be piped to electrolytic cell through the dirt slurry of dipping;

The dirt slurry through dipping that is piped to electrolytic cell is carried out oxidation and sterilization;

Before electric pond with fixed attention will be piped to through the dirt slurry of oxidation and sterilization, add defoamer in the dirt slurry of oxidation and sterilization;

Coagulate in the pond at electricity, make the solid particle flocculation that is suspended in the dirt slurry of oxidation and sterilization;

Termly electricity is coagulated the empty G﹠W cleaning that the combination of automation is carried out in the pond, this cleaning washes away the particulate pollutant on the one or more electrodes that are accumulated in electric pond with fixed attention;

The dirt slurry of flocculation is sent to the supernatant that the primary precipitate groove contains wadding mud and clarifies basically with separation;

With the supernatant of clarification basically with pipeline transmission to the supernatant of second defecator that has inclined wall to help further separated sludge and to clarify basically;

Bottom opening by stillpot and defecator extracts mud;

Measure the turbidity level of the mud that extracts continuously, and when the turbidity level measured value equals predetermined value, automatically stop to extract of described mud; And

From defecator, discharge the supernatant of clarification basically as treated effluent.

2. method according to claim 1 is characterized in that, comprises that also the dirt slurry stream that makes through dipping redirect to waste water collection tank, mixes waste water mixture with the maintenance homogeneous continuously with the dirty slurry of waste water in the waste water collection tank through the dirt slurry stream of dipping.

3. method according to claim 1 is characterized in that, also is included in the remaining dirt slurry through dipping is contacted with the oxidant of controlled quatity.

4. method according to claim 3 is characterized in that, described oxidant generates from seawater or salt solution.

5. method according to claim 1 is characterized in that, also comprises discharging treated effluent to the outboard of marine ships.

6. method according to claim 5 is characterized in that, also is included in before the discharge, one or more chemical substances is injected in the treated effluent be lower than 0.5mg/L so that residual chlorine is neutralized to.

7. method according to claim 6 is characterized in that, the effluent of described discharge comprises the BOD (BOD) that is lower than 25mg/L.

8. method according to claim 6 is characterized in that, the effluent of described discharge comprises the total suspended solid (TSS) that is lower than 35mg/L.

9. method according to claim 6 is characterized in that, the effluent of described discharge comprises the COD (COD) that is lower than 120mg/L.

10. method according to claim 6 is characterized in that, the effluent of described discharge comprises the Escherichia coli that are lower than 100cfu/100ml.

11. method according to claim 1 is characterized in that, also comprises the falling liquid film technology of utilizing, and arrives degas chamber by the dirt slurry that will flocculate with pipeline transmission, carries out the degassing of entrained gas.

12. method according to claim 6 is characterized in that, also comprises the dosage of the chemical substance that control is injected in treated effluent.

13. method according to claim 11 is characterized in that, also comprises utilizing hair-dryer, forces surrounding air to enter degas chamber and removes to dilute gas in a kind of or more kinds of dirt slurry that is entrained in flocculation.

14. method according to claim 11 is characterized in that, also is included in offshore position and disposes dirty slurry.

15. method according to claim 11 is characterized in that, described dipping pump grinds the solid particle that is suspended in the dirty slurry of waste water subtly, with the sterilization that helps to carry out in electrolytic cell.

16. a Waste Water Treatment, described system comprises:

Waste water collection tank;

Be connected to the dipping pump of waste water collection tank;

Adjacent to the mixing pump of dipping pump, described mixing pump is also connected to waste water collection tank;

Be configured to receive the electrolytic cell through dipping waste water from the dipping pump;

Electricity adjacent to electrolytic cell coagulates the pond;

Be connected to the degas chamber that electricity coagulates the pond by plumbing installation;

Primary precipitate groove adjacent to degas chamber;

Second defecator that is communicated with the stillpot fluid, described stillpot and defecator have a pair of tapered sidewalls separately and are used at least one bottom opening that mud extracts;

Be installed in the nephelometer on the public mud discharge pipe, described public mud discharge pipe is connected to stillpot and defecator;

The dechlorination unit, described dechlorination unit also comprises the chemical substance injection pump; And effluent excavationg pump.

17. system according to claim 16 is characterized in that, also comprises being coupled to air and the aqueous cleaner that electricity coagulates the pond.

18. system according to claim 17 is characterized in that, also comprises the sea water supply source that is connected to electrolytic cell.

19. system according to claim 18 is characterized in that, described degas chamber also comprises hair-dryer and air-breather, is discharged into atmosphere with the gas that allows to produce during electrolysis.