CN112979018A - Ship domestic sewage and desulfurization wastewater synchronous treatment device - Google Patents
Ship domestic sewage and desulfurization wastewater synchronous treatment device Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 47
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 24
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/008—Originating from marine vessels, ships and boats, e.g. bilge water or ballast water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Abstract
The invention provides a synchronous treatment device for ship domestic sewage and desulfurization wastewater, which comprises a mixing tank, a flocculation pump, a flocculation air floatation device, a compressed air inlet, an intermediate storage tank, a filter pump, a filtering ultraviolet integrated device and a collecting storage tank. Flocculation air supporting equipment includes flocculation basin and air supporting pond, and the top entrance in flocculation basin is equipped with the dosing pump, and the bottom in air supporting pond is equipped with aeration equipment, and the compressed air entry links to each other with aeration equipment. Filter integrative equipment of ultraviolet and include from last filter layer and the ultraviolet layer that sets gradually down, be equipped with a plurality of fibre balls in the filter layer, the lateral wall on ultraviolet layer is equipped with a plurality of ultraviolet lamp equipment. The export of blending tank passes through the entry intercommunication of flocculation pump and flocculation air supporting equipment, and the export of flocculation air supporting equipment and the entry intercommunication of intermediate storage tank, the export of intermediate storage tank and the entry intercommunication of filter pump, the export of filter pump and the top entry intercommunication of filtering the integrative equipment of ultraviolet, the bottom export of the integrative equipment of filtration ultraviolet and the entry intercommunication of collecting the storage tank.
Description
Technical Field
The invention relates to the technical field of ship wastewater treatment, in particular to a synchronous treatment device for ship domestic sewage and desulfurization wastewater.
Background
With the rapid development of shipping industry, the problem of marine pollution is more and more serious, and people pay attention to the pollution problem of ship domestic sewage and the problem of treatment and discharge of ship waste gas desulfurization wastewater.
According to the requirements of the International Maritime Organization (IMO) resolution (MEPC.227(64) standard) on the treatment and discharge of the ship domestic sewage, the main index of the ship domestic sewage comprises 5-day Biochemical Oxygen Demand (BOD)5) Chemical Oxygen Demand (COD), pH, total suspended particulate matter (TSS), heat-tolerant escherichia coli, and residual chlorine, among others. When the ship waste gas is washed by adopting a washing water technology for desulfurization, completely combusted oil substances and particulate matters in the ship waste gas can enter the washing water, and the turbidity, the pH value, the PAH (polycyclic aromatic hydrocarbon) content and the nitric acid content of the desulfurization waste water need to be continuously tested according to the IMO resolution (MEPC.259(68) standard) so as to meet the emission requirement.
At present, the domestic and foreign commonly used ship domestic sewage treatment technologies mainly comprise a small combined biological method (a sludge method, an MBR (membrane bioreactor) method and the like) and an electrochemical method (electric flocculation, seawater electrolysis for chlorine preparation and the like), but the small and medium combined biological method and the electrochemical method treatment technologies have many defects in practice. Biological treatment techniques are widely used, but suffer from a number of disadvantages including: 1. the treatment device is large in size, the grey water cannot be treated, bacteria must be cultured correctly, the wastewater cannot be treated without the bacteria, and operators have professional knowledge; 2. the biological treatment technology cannot be started at any time, once the ship is in shore, the amount of sewage is insufficient, so that bacteria living by decomposing sewage die, and once the bacteria die, the normal operation needs more than one week; 3. the biological method treatment technology needs to regularly add chemical disinfectants for disinfection, which not only occupies land, but also has greater risk of storing the chemical disinfectants; 4. the bacteria can not adapt to the impact of the water quantity and water quality change with larger amplitude; 5. the dirt (with foul smell) in the storage tank needs to be cleaned regularly. The sewage after being filtered and crushed by an electrochemical method still contains solid particles with certain particle sizes, and if the solid particles directly enter the electric flocculation device, the electrolytic efficiency and the oxidation capability of the polar plate are greatly reduced because the treatment effect of the electric flocculation on the particles is not obvious and the pollution of an electrolytic tank is easily caused; meanwhile, the method for treating the wastewater by using the electrolytic seawater chlorine oxidation process cannot effectively degrade pollutants due to weak oxidation capacity of the hypochlorous acid, has long service life, is easy to cause residual chlorine, and needs to treat the residual chlorine after treatment. Therefore, the existing biological method and electrochemical method can not effectively meet the discharge standard of the IMO resolution (MEPC.227(64) standard) for the treatment of the ship domestic sewage.
At present, a centrifugal machine or ceramic membrane filtration is taken as a core to treat the ship waste gas desulfurization waste water internationally, a device taking the centrifugal machine as the core has small treatment capacity, low treatment concentration and high energy consumption, and a device taking the ceramic membrane filtration as the core has high price, easy blockage, high maintenance cost and low treatment concentration and can not meet the requirement.
Meanwhile, treatment devices are required to be respectively installed for treating the ship domestic sewage and the ship desulfurization wastewater at the present stage, the total occupied area is large, various matched devices are repeatedly equipped, and the existing ship domestic sewage treatment device and the existing ship waste gas desulfurization wastewater treatment device cannot effectively meet the IMO ship water pollution discharge standard, so that the existing treatment technology must be upgraded and modified or a new treatment method must be developed.
Disclosure of Invention
The invention aims to provide a synchronous treatment device for ship domestic sewage and desulfurization wastewater, aiming at solving the defects in the prior art, and adopting a comprehensive method of 'structured flocculation flotation + fiber ball filtration ultraviolet integration' to synchronously treat the mixed water of the ship domestic sewage and the ship desulfurization wastewater, thereby not only reducing the volume of the whole set of equipment and reducing the purchase cost and the operation and maintenance cost of the equipment, but also being high in treatment concentration and large in treatment capacity, and being applicable to various ships.
The invention provides a synchronous treatment device for ship domestic sewage and desulfurization wastewater, which comprises a mixing tank, a flocculation pump, flocculation air floatation equipment, a compressed air inlet, an intermediate storage tank, a filter pump, ultraviolet filtering integrated equipment and a collection storage tank, wherein the mixing tank is connected with the flocculation pump;
the flocculation floatation equipment comprises a flocculation tank and an air floatation tank, a chemical feeding pump is arranged at an inlet at the top of the flocculation tank, an aeration device is arranged at the bottom of the air floatation tank, and a compressed air inlet is connected with the aeration device;
the ultraviolet filtering integrated equipment comprises a filtering layer and an ultraviolet layer which are sequentially arranged from top to bottom, a plurality of fiber balls are arranged in the filtering layer, and a plurality of ultraviolet lamp equipment are arranged on the side wall of the ultraviolet layer;
the outlet of the mixing tank is communicated with the inlet of the flocculation pump, the outlet of the flocculation pump is communicated with the top inlet of the flocculation tank, the bottom outlet of the flocculation tank is communicated with the bottom inlet of the air floatation tank, the bottom outlet of the air floatation tank is communicated with the inlet of the intermediate storage tank, the outlet of the intermediate storage tank is communicated with the inlet of the filter pump, the outlet of the filter pump is communicated with the top inlet of the ultraviolet filtering integrated equipment, and the bottom outlet of the ultraviolet filtering integrated equipment is communicated with the inlet of the collecting storage tank.
Further, be equipped with agitating unit in the flocculation basin, agitating unit includes drive arrangement, connecting rod and a plurality of stirring vane, drive arrangement is located the top in flocculation basin, the top of connecting rod with drive arrangement links to each other, a plurality of stirring vane all are located in the flocculation basin, just a plurality of stirring vane from last to down in proper order with the connecting rod links to each other.
Furthermore, a plurality of baffle plates which are sequentially arranged from left to right are arranged in the air floatation tank, the baffle plates are all obliquely arranged, the oblique directions of two adjacent baffle plates are opposite, and the two adjacent baffle plates are arranged in a vertically staggered manner.
Furthermore, the plurality of baffle plates comprise a first baffle plate and a second baffle plate, the first baffle plate is arranged close to the bottom inlet of the air flotation tank, the top end of the first baffle plate is inclined at one side close to the bottom inlet of the air flotation tank compared with the bottom end of the first baffle plate, the second baffle plate is arranged above the first baffle plate, and the top end of the second baffle plate is inclined at one side far away from the bottom inlet of the air flotation tank compared with the bottom end of the second baffle plate.
Furthermore, the top in air supporting pond is equipped with mud scraper and mud sediment pond, the mud sediment pond is located one side of mud scraper, mud scraper be used for with mud sediment in the air supporting pond is scraped in the mud sediment pond.
Further, be equipped with the runner that supplies mixed waste water circulation in the ultraviolet layer, be equipped with a plurality of cross slabs in the ultraviolet layer, a plurality of cross slabs from last to down interval in proper order sets up, a plurality of cross slabs will the S-shaped structure of making a round trip to buckle many times is cut apart into to the runner, a plurality of ultraviolet lamp equipment set up respectively the department of buckling of each of runner.
Furthermore, the synchronous processing device further comprises a backwashing pump, a first return pipeline, a second return pipeline and a differential pressure gauge, wherein two measuring ends of the differential pressure gauge are respectively connected with the filter layer and the ultraviolet layer, a backwashing outlet of the collecting storage tank is communicated with an inlet of the backwashing pump, an outlet of the backwashing pump is communicated with a bottom outlet of the ultraviolet filtering integrated equipment, two ends of the first return pipeline are respectively communicated with a top inlet of the ultraviolet filtering integrated equipment and an inlet of the mixing tank, and two ends of the second return pipeline are respectively communicated with an outlet of the filter pump and an inlet of the mixing tank.
Furthermore, a compressed air valve is arranged on a pipeline between the compressed air inlet and the aeration device, a first backwashing valve is arranged on a pipeline between the outlet of the backwashing pump and the outlet at the bottom of the ultraviolet filtering integrated equipment, a second backwashing valve is arranged on the first backflow pipeline, a third backwashing valve is arranged on the second backflow pipeline, a first filter valve is arranged on a pipeline between the outlet of the filtering pump and the inlet at the top of the ultraviolet filtering integrated equipment, and a second filter valve is arranged on a pipeline between the outlet at the bottom of the ultraviolet filtering integrated equipment and the inlet of the collecting storage tank.
Further, the top entrance of flocculation basin still is equipped with the flocculation baffle, the flocculation baffle with relative setting from top to bottom of dosing pump.
Further, liquid level switch sets are arranged in the mixing tank and the middle storage tank.
The invention provides a synchronous treatment device for ship domestic sewage and desulfurization wastewater, which synchronously treats mixed water of the ship domestic sewage and the ship desulfurization wastewater by adopting a comprehensive method of 'structural flocculation air flotation + fiber ball filtration ultraviolet integration' on the premise of structural equipment structure. According to the invention, firstly, a high-efficiency flocculating agent is added into a flocculation tank, so that suspended particles, sludge and oil stains in mixed wastewater form flocculation particles, after the flocculation particles enter an air floatation tank, a large amount of micro bubbles generated by an aeration device in the air floatation tank are combined with the flocculation particles, so that the flocculation particles rise to the top of the air floatation tank, and most of the suspended particles, sludge and oil stains are removed from the mixed wastewater after the mixed wastewater passes through flocculation air floatation equipment; when the mixed wastewater passes through the ultraviolet filtering integrated equipment, fine particles, residual oil components (PAH and the like), escherichia coli, chromaticity and the like are further filtered and removed through modified fiber balls in a filtering layer, and then nitrate, total nitrogen, total phosphorus and the like dissolved in the mixed wastewater are removed through oxidation of ultraviolet lamp equipment in the ultraviolet layer, so that the mixed wastewater of the ship domestic sewage and the desulfurization wastewater meets the IMO emission requirement.
The invention not only reduces the volume of the whole set of processing equipment, reduces the energy consumption of the equipment, and reduces the purchase cost and the operation and maintenance cost of the equipment, but also has high processing concentration and large processing capacity, and can be suitable for various ships.
Drawings
FIG. 1 is a schematic structural diagram of a synchronous treatment device for ship domestic sewage and desulfurization wastewater in an embodiment of the invention.
FIG. 2 is a graph showing the comparison of the indexes before and after treatment of the mixed wastewater in one example.
FIG. 3 is a graph showing the comparison of the indexes before and after the treatment of the mixed wastewater in another example.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The terms of orientation, up, down, left, right, front, back, top, bottom, and the like (if any) referred to in the specification and claims of the present invention are defined by the positions of structures in the drawings and the positions of the structures relative to each other, only for the sake of clarity and convenience in describing the technical solutions. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
As shown in fig. 1, the device for synchronously treating domestic sewage and desulfurization wastewater of a ship provided by the embodiment of the invention comprises a mixing tank 1, a flocculation pump 6, a flocculation air flotation device 2, a compressed air inlet 225, an intermediate storage tank 3, a filter pump 7, a filtering ultraviolet integrated device 4 and a collection storage tank 5.
The flocculation flotation device 2 comprises a flocculation tank 21 and a flotation tank 22, a chemical feeding pump 211 is arranged at the inlet of the top of the flocculation tank 21, an aeration device 224 is arranged at the bottom of the flotation tank 22, and a compressed air inlet 225 is connected with the aeration device 224.
The ultraviolet filtering integrated device 4 comprises a filtering layer 41 and an ultraviolet layer 42 which are sequentially arranged from top to bottom, a plurality of fiber balls 411 are arranged in the filtering layer 41, and a plurality of ultraviolet lamp devices 421 are arranged on the side wall of the ultraviolet layer 42.
The export of blending tank 1 and the entry intercommunication of flocculating pump 6, the export of flocculating pump 6 and the top entry intercommunication of flocculation basin 21, the bottom export of flocculation basin 21 and the bottom entry intercommunication of air supporting pond 22, the bottom export of air supporting pond 22 and the entry intercommunication of intermediate storage tank 3, the export of intermediate storage tank 3 and the entry intercommunication of filter pump 7, the export of filter pump 7 and the top entry intercommunication of filtering the integrative equipment 4 of ultraviolet, the bottom export of filtering the integrative equipment 4 of ultraviolet and the entry intercommunication of collecting storage tank 5, be equipped with the drainage export (not numbered in the figure) that is used for discharging the clear water of collecting in the storage tank 5 on the collection storage tank 5.
Further, a flocculation baffle 213 is disposed at the top inlet of the flocculation tank 21, and the flocculation baffle 213 and the dosing pump 211 are disposed opposite to each other.
Further, be equipped with agitating unit 23 in the flocculation tank 21, agitating unit 23 includes drive arrangement 231, connecting rod 232 and a plurality of stirring vane 233, and drive arrangement 231 is located the top of flocculation tank 21, and the top of connecting rod 232 links to each other with drive arrangement 231, and a plurality of stirring vane 233 all are located flocculation tank 21, and a plurality of stirring vane 233 link to each other with connecting rod 232 from last to down in proper order. The driving device 231 may be embodied as a motor.
Specifically, the dosing pump 211 is used for adding a high-efficiency flocculant into the flocculation tank 21, the flocculant is a polymeric flocculant with a ratio of PAM (polyacrylamide) to PAC (polyaluminium chloride) being 1:7, the PAM flocculant is a cationic flocculant, the ionic degree is greater than 65%, the molecular weight is greater than 1800 ten thousand, and the mass fraction of alumina in the PAC flocculant is greater than 30%. When the mixed wastewater of the ship domestic sewage and the desulfurization wastewater enters from the top inlet of the flocculation tank 21, the mixed wastewater and the flocculant can be rapidly mixed under a torrent by arranging the flocculation baffle 213 below the dosing pump 211. The mixed waste water and the flocculating agent after mixing are further flocculated under the stirring action of the stirring device 23, the rotating speed of the stirring device 23 is 120r/min, and meanwhile, the flocculation effect of the flocculating agent and the mixed waste water can be improved by 1.8 times through the stirring of the stirring blades 233, so that suspended particles and sludge form flocculating particles with proper sizes, the particle size of the flocculating particles is not too large and precipitates, and the flocculated mixed waste water carries the flocculating particles to enter the air floatation tank 22.
Further, a plurality of baffle plates 24 are arranged in the floatation tank 22 in sequence from left to right, the baffle plates 24 are all arranged in an inclined manner, the inclination directions of two adjacent baffle plates 24 are opposite, and the two adjacent baffle plates 24 are arranged in a vertically staggered manner.
Specifically, in the present embodiment, the plurality of baffles 24 includes a first baffle 241 and a second baffle 242, the first baffle 241 is disposed near the bottom inlet of the air flotation tank 22, and the top end of the first baffle 241 is inclined to the side near the bottom inlet of the air flotation tank 22 compared to the bottom end of the first baffle 241, the second baffle 242 is disposed above the first baffle 241, and the top end of the second baffle 242 is inclined to the side far from the bottom inlet of the air flotation tank 22 compared to the bottom end of the second baffle 242.
Further, a mud scraper 222 and a sludge tank 223 are arranged at the top of the floatation tank 22, the sludge tank 223 is located at one side of the mud scraper 222, and the mud scraper 222 is used for scraping the sludge in the floatation tank 22 into the sludge tank 223.
Further, a filter screen 226 is arranged at the bottom outlet of the floatation tank 22, the filter screen 226 is positioned in the floatation tank 22 and covers the bottom outlet of the floatation tank 22, and the filter screen 226 is used for intercepting the suspended matters which do not float upwards.
Specifically, in the present embodiment, the flocculation tank 21 and the flotation tank 22 are attached to each other and are of an integral structure, which is beneficial to reducing the occupied space of the equipment. The mixed waste water after the flocculation gets into air supporting pond 22, is equipped with two opposite baffling boards of slope direction 24 in the air supporting pond 22, and baffling board 24 can change the rivers direction accurately to improve the come-up effect of suspended solid, with prevent that the tiny suspended solid is taken away by rivers and great suspended solid deposits in the waste water, the contained angle between baffling board 24 and the bottom plane is preferably 60. The compressed air generates micro-bubbles after passing through the aeration device 224, the micro-bubbles are uniformly distributed at the bottom of the air floatation tank 22, and the bubbles are combined with suspended particles, oil and other substances, then rise to the mud scraper 222 and are scraped into the mud residue tank 223 by the mud scraper 222 for temporary storage. After flocculation air floatation treatment, mixing most sludge particles in the wastewater,Oil substances are treated cleanly, BOD5The removal rate of (five-day biochemical oxygen demand) and COD (chemical oxygen demand) is more than 80%, the removal rate of TSS (total suspended particulate matter) and turbidity is more than 83%, and the mixed wastewater after the flocculation air flotation treatment enters the intermediate storage tank 3 after passing through a filter screen 226.
Further, in this embodiment, no pump is disposed between the flotation tank 22 and the intermediate storage tank 3, that is, the mixed wastewater in the flotation tank 22 is pressed into the intermediate storage tank 3 by the principle of communicating vessels, and the height of the inlet of the intermediate storage tank 3 is generally less than or equal to the height of the mud scraper 222, so that the mixed wastewater in the flotation tank 22 can smoothly enter the intermediate storage tank 3.
Further, be equipped with the runner 44 that supplies the waste water circulation in the ultraviolet layer 42, be equipped with a plurality of cross slabs 43 in the ultraviolet layer 42, a plurality of cross slabs 43 are from last to setting up at interval in proper order down, and a plurality of cross slabs 43 are cut apart into the S-shaped structure of making a round trip to buckle many times with runner 44, and a plurality of ultraviolet lamp equipment 421 set up respectively in each department of buckling of runner 44.
Specifically, in the present embodiment, the plurality of transverse partition plates 43 include a plurality of first transverse partition plates 431 and a plurality of second transverse partition plates 432, the plurality of first transverse partition plates 431 and the plurality of second transverse partition plates 432 are alternately arranged from top to bottom, the left end of each first transverse partition plate 431 is connected to the side wall of the ultraviolet layer 42, a gap is provided between the right end of each first transverse partition plate 431 and the side wall of the ultraviolet layer 42, a gap is provided between the left end of each second transverse partition plate 432 and the side wall of the ultraviolet layer 42, the right end of each second transverse partition plate 432 is connected to the side wall of the ultraviolet layer 42, and the plurality of ultraviolet lamp devices 421 are respectively arranged at the gap between the first transverse partition plates 431 and the side wall of the ultraviolet layer 42 and the gap between the second transverse partition plates 432 and the side wall of the ultraviolet layer 42.
Preferably, in the present embodiment, the fiber balls 411 are modified fiber balls.
In particular, in the present embodiment, the filter layer 41 and the uv layer 42 are of an integral structure, which is beneficial to reduce the occupied space of the device. The optimal filtering pressure of the fiber balls 411 is 2.5bar, the modified fiber balls adopt a novel ligation mode, and the surface of the modified fiber balls is modified to enhance the adsorption capacity to oil and organic matters. And is modifiedThe porosity of the filter layer of the fiber ball is gradually reduced along the water flow direction, a relatively ideal filter material pore (big top and small bottom) distribution state is formed, the filter effect is better, the filter speed is high and can reach 30-35m/h, and the density is more than 2.0g/cm3The filter material only needs to be supplemented by about 5% every year without replacement, and the fiber ball after ligation modification has hydrophilic oleophobic property and good backwashing regeneration performance. The mixed wastewater can intercept tiny particles, soluble oil, escherichia coli and the like which are difficult to be treated by flocculation and air flotation after passing through the modified fiber balls, the chromaticity is removed, and the mixed wastewater after filtration treatment enters the ultraviolet layer 42.
After the mixed wastewater enters the ultraviolet layer 42, the mixed wastewater is oxidized under the irradiation of the plurality of ultraviolet lamp devices 421 and further dissolved organic matters, total nitrogen, total phosphorus, and the like in the mixed wastewater are removed. Meanwhile, the flow channel 44 is divided into S-shaped structures bent back and forth for multiple times by the transverse partition plates 43, and the ultraviolet lamp device 421 is arranged at each layer of the transverse partition plate 43, so that the water flow time is prolonged, the contact time of mixed wastewater and ultraviolet irradiation is prolonged, the problems of short oxidation time and poor oxidation effect are solved by using a small space, and the occupied space of the device is saved. BOD in mixed wastewater after filtering and ultraviolet treatment5The removal rate of COD is more than 90 percent, the removal rate of TSS, turbidity and PAH (polycyclic aromatic hydrocarbons) is more than 96 percent, and simultaneously the contents of escherichia coli, total nitrogen and total phosphorus are all lower than the emission standard value. The mixed wastewater after being filtered and treated by ultraviolet enters a collection storage tank 5 for temporary storage and then is directly discharged to the ship board or circulated to a circulating tank (not shown) of a closed-loop desulfurization system for recycling.
Furthermore, the synchronous processing device further comprises a backwashing pump 8, a first backflow pipeline 17, a second backflow pipeline 18 and a differential pressure gauge 10, two measuring ends of the differential pressure gauge 10 are respectively connected with the filter layer 41 and the ultraviolet layer 42, a backwashing outlet of the collecting storage tank 5 is communicated with an inlet of the backwashing pump 8, an outlet of the backwashing pump 8 is communicated with a bottom outlet of the ultraviolet filtering integrated device 4, two ends of the first backflow pipeline 17 are respectively communicated with a top inlet of the ultraviolet filtering integrated device 4 and an inlet of the mixing tank 1, and two ends of the second backflow pipeline 18 are respectively communicated with an outlet of the filter pump 7 and an inlet of the mixing tank 1.
Furthermore, a compressed air valve 11 is arranged on a pipeline between the compressed air inlet 225 and the aeration device 224, a first back-washing valve 14 is arranged on a pipeline between the outlet of the back-washing pump 8 and the bottom outlet of the ultraviolet filtering integrated device 4, a second back-washing valve 15 is arranged on the first return pipeline 17, a third back-washing valve 16 is arranged on the second return pipeline 18, a first filter valve 12 is arranged on a pipeline between the outlet of the filter pump 7 and the top inlet of the ultraviolet filtering integrated device 4, and a second filter valve 13 is arranged on a pipeline between the bottom outlet of the ultraviolet filtering integrated device 4 and the inlet of the collecting storage tank 5.
Specifically, the differential pressure gauge 10 is used to measure the pressure difference between the filter layer 41 and the ultraviolet layer 42, and when the filter layer 41 is gradually clogged, the pressure inside the filter layer 41 gradually becomes large, and the pressure inside the ultraviolet layer 42 does not change or becomes slightly small, so that the pressure difference between the filter layer 41 and the ultraviolet layer 42 gradually becomes large. When the pressure difference between the filter layer 41 and the ultraviolet layer 42 exceeds 1.5bar, the filter valve set is closed and the backwash valve set is opened through a control program, the backwash pump 8 pumps the cleaning water in the collection storage tank 5 into the ultraviolet filtering integrated device 4 to backwash the fiber balls 411 in the filter layer 41 for 2 minutes, and the washing liquid returns to the mixing tank 1 through the first return pipeline 17.
Specifically, when the pressure difference between the filter layer 41 and the ultraviolet layer 42 exceeds 1.5bar and back flushing is required, the first filter valve 12 and the second filter valve 13 are closed, the first back flushing valve 14, the second back flushing valve 15 and the third back flushing valve 16 are opened, the back flushing pump 8 is opened, the back flushing pump 8 pumps the cleaning water in the collecting storage tank 5 into the ultraviolet filtering integrated device 4 to back flush the fiber balls 411 in the filter layer 41, and the flushing liquid returns to the mixing tank 1 through the first return pipeline 17. It should be noted that, during the back flushing, the filter pump 7 and the equipment before the filter pump 7 are normally operated, and in order to prevent the intermediate storage tank 3 from alarming when the liquid level is too high, a second return line 18 is provided at the outlet of the filter pump 7, and if the liquid level of the intermediate storage tank 3 is too high, the mixed wastewater in the intermediate storage tank 3 can be pumped back to the mixing tank 1 through the second return line 18.
Further, a liquid level switch group 9 is arranged in each of the mixing tank 1 and the intermediate storage tank 3.
Specifically, the functions of the liquid level switch group 9 include low liquid level stop, high liquid level operation, and ultra high liquid level alarm. When the liquid level in the mixing tank 1 reaches a high liquid level, the flocculation pump 6 starts to work to pump the mixed wastewater in the mixing tank 1 into the flocculation tank 21; when the liquid level in the mixing tank 1 reaches a low liquid level, the flocculation pump 6 stops working. When the liquid level in the intermediate storage tank 3 reaches a high liquid level, the filter pump 7 starts to work to pump the mixed wastewater in the intermediate storage tank 3 into the ultraviolet filtering integrated equipment 4, and when the liquid level in the intermediate storage tank 3 reaches a low liquid level, the filter pump 7 stops working.
As shown in fig. 1, the main working flow of the synchronous treatment device for domestic sewage and desulfurization wastewater of a ship in the embodiment of the invention is as follows:
1. mixing: domestic sewage and desulfurization wastewater generated by a ship enter the mixing tank 1 through the inlet of the mixing tank 1 and are mixed in the mixing tank 1 to form mixed wastewater.
2. Flocculation air flotation: the mixed wastewater in the mixing tank 1 is pumped out to the flocculation tank 21 by the flocculation pump 6, the efficient flocculating agent is added into the flocculation tank 21 by the dosing pump 211, suspended particles and sludge in the mixed wastewater are combined with the flocculating agent to form flocculating particles with proper sizes, and the flocculated mixed wastewater carries the flocculating particles to enter the air floatation tank 22. After the mixed wastewater enters the floatation tank 22, the micro-bubbles generated by the aeration device 224 in the floatation tank 22 are combined with suspended particles, oils and other substances in the mixed wastewater, and then the combined mixture rises to the mud scraper 222, and is scraped into the sludge tank 223 by the mud scraper 222 for temporary storage. After flocculation air floatation treatment, most of sludge particles and oil substances in the mixed wastewater are treated completely, and simultaneously BOD5COD, TSS and turbidity reduce, and the mixed waste water after flocculation air supporting treatment enters middle storage tank 3 after passing through filter screen 226.
3. Intermediate storage: the mixed wastewater enters the intermediate storage tank 3 and then is temporarily stored in the intermediate storage tank 3.
4. Filtering and oxidizing: the mixed wastewater enters the ultraviolet filtering integrated equipment 4 from the middle storage tank 3, fine particles, residual oil components (PAH and the like), escherichia coli and chromaticity are further filtered and removed, meanwhile, nitrate, total nitrogen, total phosphorus and the like dissolved in the mixed wastewater are removed through ultraviolet oxidation, and the treated mixed wastewater meets the discharge requirements of the resolution of IMO MEPC.227(64) and the resolution of IMO MEPC.259 (68).
5. Collecting waste liquid: the mixed wastewater enters the collecting storage tank 5 from the ultraviolet filtering integrated equipment 4, is temporarily stored in the collecting storage tank 5 and then is directly discharged to the ship board or is circulated to the circulating tank of the closed-loop desulfurization system for recycling.
6. Backwashing: when the filter layer 41 is blocked and the pressure difference between the filter layer 41 and the ultraviolet layer 42 exceeds a set value, a backwashing program is started for backwashing, the backwashing pump 8 pumps the cleaning water in the collecting storage tank 5 into the ultraviolet filtering integrated device 4 for backwashing the fiber balls 411 in the filter layer 41, and the flushing liquid returns to the mixing tank 1 through the first return pipeline 17.
The embodiment of the invention has the beneficial effects that:
1. on the premise of the structure of the structured equipment, the embodiment of the invention synchronously treats the mixed water of the ship domestic sewage and the ship desulfurization wastewater by adopting a comprehensive method of 'structural flocculation air flotation + fiber ball filtration ultraviolet integration', solves the problem that treatment devices are required to be respectively installed on the domestic sewage and the desulfurization wastewater, reduces the repeated matching arrangement of the equipment, and reduces the volume of the whole set of treatment equipment because the flocculation air flotation equipment 2 and the filtration ultraviolet integration equipment 4 are of an integrated structure;
2. according to the embodiment of the invention, the high-efficiency flocculating agent is adopted to flocculate the mixed wastewater, and the stirring device 23 is adopted to stir, so that suspended particles, sludge and oil stains in the mixed wastewater can be favorably formed into flocculated particles; meanwhile, the baffle plate 24 is arranged in the floatation tank 22, and the baffle plate 24 can accurately change the direction of water flow, so that the floating effect of suspended matters is improved, tiny suspended matters in the wastewater are prevented from being taken away by the water flow and larger suspended matters are prevented from being precipitated, and suspended particles, sludge and oil stains in the mixed wastewater are favorably removed;
3. in the embodiment of the invention, the ultraviolet filtering integrated equipment 4 adopts a structural form of filtering ultraviolet from top to bottom, and the wastewater after fine filtering treatment by adopting a novel ligation mode and modified fiber balls is transparent, has no suspended matters and oil stains, fully protects the ultraviolet oxidation part at the lower part, increases the contact time of the wastewater and the ultraviolet lamp equipment 421 by the S-shaped flow channel 44 of the ultraviolet oxidation part, and solves the problems of short oxidation time and poor oxidation effect by using a smaller space, thereby saving the equipment space;
4. the whole set of processing device provided by the embodiment of the invention can process high concentration and large processing capacity. For ship domestic sewage, the treated BOD5The contents of COD, TSS, colibacillus, pH, residual chlorine and the like reach the standard, and the solution meets the resolution of IMO MEPC.227 (64); compared with the desulfurization wastewater treatment device taking a centrifugal machine or a ceramic membrane as a core in the market, the desulfurization wastewater treatment device has the advantages that the energy consumption is lower, the treatment concentration and the treatment capacity are higher, and the treated desulfurization wastewater meets the requirements of the resolution of IMO MEPC.259(68) on the discharge of turbidity, pH value, PAH and nitric acid.
The invention not only reduces the volume of the whole set of processing equipment, reduces the energy consumption of the equipment, and reduces the purchase cost and the operation and maintenance cost of the equipment, but also has high processing concentration and large processing capacity, and can be suitable for various ships.
The ship domestic sewage and desulfurization wastewater synchronous treatment device is used for mixing and then actually treating the ship domestic sewage and the ship desulfurization wastewater, and relevant parameters in the ship domestic sewage and the ship desulfurization wastewater before and after treatment are analyzed according to an internationally recognized test method, and specific results are shown in the first example and the second example.
Example one:
the synchronous treatment device is installed in a certain ship and is actually operated and measured, the diesel engine power of the ship is 3.5MW, the sulfur content of heavy oil is 2.8%, alkaline washing water is adopted as desulfurization (closed-loop) washing water, and the detection flow of a desulfurization wastewater water quality analyzer after mixed wastewater treatment is 1m3H is used as the reference value. The results of the indexes in the domestic sewage and the desulfurization wastewater before and after mixing are shown in fig. 2, and it can be seen from the figure that the indexes after the mixed wastewater treatment all meet the discharge standard.
Example two:
the synchronous processing device is installed in another ship and is actually operated and measured, the diesel engine power of the ship is 3.5MW, the sulfur content of heavy oil is 3.2%, alkaline washing water is adopted as desulfurization (closed-loop) washing water, and the detection flow of a desulfurization wastewater water quality analyzer after mixed wastewater treatment is 1m3H is used as the reference value. The results of the indexes in the domestic sewage and the desulfurization wastewater before and after mixing are shown in fig. 3, and it can be seen from the figure that the indexes after the mixed wastewater treatment all meet the discharge standard.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A synchronous treatment device for ship domestic sewage and desulfurization wastewater is characterized by comprising a mixing tank (1), a flocculation pump (6), a flocculation air floatation device (2), a compressed air inlet (225), an intermediate storage tank (3), a filter pump (7), a filtering ultraviolet integrated device (4) and a collecting storage tank (5);
the flocculation flotation equipment (2) comprises a flocculation tank (21) and a flotation tank (22), a chemical feeding pump (211) is arranged at an inlet at the top of the flocculation tank (21), an aeration device (224) is arranged at the bottom of the flotation tank (22), and a compressed air inlet (225) is connected with the aeration device (224);
the ultraviolet filtering integrated equipment (4) comprises a filtering layer (41) and an ultraviolet layer (42) which are sequentially arranged from top to bottom, a plurality of fiber balls (411) are arranged in the filtering layer (41), and a plurality of ultraviolet lamp equipment (421) are arranged on the side wall of the ultraviolet layer (42);
the export of blending tank (1) with the entry intercommunication of flocculation pump (6), the export of flocculation pump (6) with the top entry intercommunication of flocculation basin (21), the bottom export of flocculation basin (21) with the bottom entry intercommunication of air supporting pond (22), the bottom export of air supporting pond (22) with the entry intercommunication of intermediate storage tank (3), the export of intermediate storage tank (3) with the entry intercommunication of filter pump (7), the export of filter pump (7) with the top entry intercommunication of filtering the integrative equipment of ultraviolet (4), the bottom export of filtering the integrative equipment of ultraviolet (4) with the entry intercommunication of collecting storage tank (5).
2. The synchronous treatment device for the marine domestic sewage and the desulfurization wastewater according to claim 1, wherein a stirring device (23) is arranged in the flocculation tank (21), the stirring device (23) comprises a driving device (231), a connecting rod (232) and a plurality of stirring blades (233), the driving device (231) is arranged at the top of the flocculation tank (21), the top end of the connecting rod (232) is connected with the driving device (231), the stirring blades (233) are arranged in the flocculation tank (21), and the stirring blades (233) are sequentially connected with the connecting rod (232) from top to bottom.
3. The synchronous treatment device for the marine domestic sewage and the desulfurization wastewater according to claim 1, wherein a plurality of baffle plates (24) are arranged in the floatation tank (22) in sequence from left to right, the baffle plates (24) are all arranged in an inclined manner, the inclination directions of two adjacent baffle plates (24) are opposite, and the two adjacent baffle plates (24) are arranged in an up-and-down staggered manner.
4. The apparatus for synchronously treating marine domestic sewage and desulfurization wastewater according to claim 3, wherein the plurality of baffles (24) comprises a first baffle (241) and a second baffle (242), the first baffle (241) is disposed near the bottom inlet of the air flotation tank (22), the top end of the first baffle (241) is inclined to the side near the bottom inlet of the air flotation tank (22) compared to the bottom end of the first baffle (241), the second baffle (242) is disposed above the first baffle (241), and the top end of the second baffle (242) is inclined to the side away from the bottom inlet of the air flotation tank (22) compared to the bottom end of the second baffle (242).
5. The synchronous treatment device for the marine domestic sewage and the desulfurization wastewater according to claim 1, characterized in that a mud scraper (222) and a mud residue pool (223) are arranged at the top of the air flotation tank (22), the mud residue pool (223) is located at one side of the mud scraper (222), and the mud scraper (222) is used for scraping the mud residue in the air flotation tank (22) into the mud residue pool (223).
6. The synchronous treatment device for the marine domestic sewage and the desulfurization wastewater according to claim 1, wherein a flow channel (44) for circulating the mixed wastewater is arranged in the ultraviolet layer (42), a plurality of cross plates (43) are arranged in the ultraviolet layer (42), the cross plates (43) are sequentially arranged from top to bottom at intervals, the flow channel (44) is divided into S-shaped structures bent back and forth for multiple times by the cross plates (43), and the ultraviolet lamp devices (421) are respectively arranged at each bent part of the flow channel (44).
7. The synchronous treatment device for marine domestic sewage and desulfurization waste water according to claim 1, the synchronous processing device also comprises a back washing pump (8), a first return pipeline (17), a second return pipeline (18) and a differential pressure meter (10), two measuring ends of the differential pressure gauge (10) are respectively connected with the filter layer (41) and the ultraviolet layer (42), the back-flushing outlet of the collecting storage tank (5) is communicated with the inlet of the back-flushing pump (8), the outlet of the back washing pump (8) is communicated with the outlet at the bottom of the ultraviolet filtering integrated equipment (4), two ends of the first return pipeline (17) are respectively communicated with the top inlet of the ultraviolet filtering integrated equipment (4) and the inlet of the mixing tank (1), and two ends of the second return pipeline (18) are respectively communicated with the outlet of the filter pump (7) and the inlet of the mixing tank (1).
8. The synchronous processing device of marine domestic sewage and desulfurization wastewater according to claim 7, a compressed air valve (11) is arranged on a pipeline between the compressed air inlet (225) and the aeration device (224), a first back-washing valve (14) is arranged on a pipeline between the outlet of the back-washing pump (8) and the outlet at the bottom of the ultraviolet filtering integrated equipment (4), a second back-flushing valve (15) is arranged on the first return pipeline (17), a third back-flushing valve (16) is arranged on the second return pipeline (18), a first filter valve (12) is arranged on a pipeline between the outlet of the filter pump (7) and the inlet at the top of the ultraviolet filtering integrated equipment (4), and a second filter valve (13) is arranged on a pipeline between the bottom outlet of the ultraviolet filtering integrated equipment (4) and the inlet of the collecting storage tank (5).
9. The synchronous treatment device for the marine domestic sewage and the desulfurization wastewater according to claim 1, wherein a flocculation baffle (213) is further arranged at an inlet at the top of the flocculation tank (21), and the flocculation baffle (213) and the dosing pump (211) are arranged in an up-and-down opposite manner.
10. The synchronous treatment device for marine domestic sewage and desulfurization wastewater according to any one of claims 1 to 9, characterized in that a liquid level switch group (9) is provided in each of the mixing tank (1) and the intermediate storage tank (3).
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| WO2002034680A1 (en) * | 2000-10-25 | 2002-05-02 | The Regents Of The University Of California | Reclaiming water and usable brine concentrate from domestic sewage |
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