CN113060876A - Air-flotation ultrafiltration treatment system and process for ship tail gas desulfurization washing wastewater - Google Patents
Air-flotation ultrafiltration treatment system and process for ship tail gas desulfurization washing wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 68
- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 54
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 49
- 230000023556 desulfurization Effects 0.000 title claims abstract description 49
- 238000005406 washing Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000008569 process Effects 0.000 title claims abstract description 32
- 238000005188 flotation Methods 0.000 title claims abstract description 26
- 230000003647 oxidation Effects 0.000 claims abstract description 60
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 60
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 12
- 239000012528 membrane Substances 0.000 claims abstract description 9
- 239000000919 ceramic Substances 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims abstract description 5
- 239000010802 sludge Substances 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 239000002699 waste material Substances 0.000 claims description 29
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 230000002572 peristaltic effect Effects 0.000 claims description 11
- 238000011268 retreatment Methods 0.000 claims description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010992 reflux Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
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- 230000003472 neutralizing effect Effects 0.000 abstract 1
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- 239000003921 oil Substances 0.000 description 11
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- 239000010865 sewage Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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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
-
- 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
-
- 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
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
- C02F2101/327—Polyaromatic Hydrocarbons [PAH's]
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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
- C02F2209/11—Turbidity
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Abstract
The invention discloses a ship tail gas desulfurization washing wastewater air-flotation ultrafiltration treatment system and a technology, wherein the treatment system comprises: neutralizing oxidation equipment, air flotation equipment, ultrafiltration equipment and a plate-and-frame filter press; the neutralization oxidation equipment comprises a gas-liquid mixing nozzle, an ultraviolet disinfection lamp, a pH feedback device, a sodium-alkali tank, a PAC tank, a PAM tank and a blower; the air floatation equipment comprises a slag scraper; the ultrafiltration device comprises a tubular ceramic membrane. The whole process finishes the adjustment of pH and the oxidation of SO only in a neutralization oxidation device3 2‑Meanwhile, the purpose of fully mixing the wastewater with PAC and PAM can be realized, and a large amount of space is saved; the ultrafiltration process is directly used after the first-stage air floatation process, thereby simplifying the process and alsoThe occupied area is reduced, and the cost is reduced; the tubular ceramic membrane is selected as the ultrafiltration equipment of the process, so that the filtration flux is large, the efficiency is high, the cost is low, the service life of the membrane is long, the cleaning is convenient, and the effluent quality can also reach the discharge standard of desulfurization washing wastewater.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a system and a process for air-flotation ultrafiltration treatment of ship tail gas desulfurization washing wastewater.
Background
A large amount of SO is generated during the navigation of the shipXAnd the tail gas of pollutants such as particulate matters, and the like, the environmental protection problem is considered, certain desulfurization treatment needs to be carried out on the tail gas, and the desulfurization waste water generated by the desulfurization technology can cause environmental pollution. In order to enable the desulfurization washing wastewater of the ship tail gas to reach the corresponding sewage discharge standard, the desulfurization washing water is treated and then is subjected to industrial treatment.
At present, the wet method exhaust gas desulfurization method of the marine diesel engine is mainly a magnesium method and a sodium method, and no matter which method and reagent are used, desulfurization washing wastewater is necessarily generated. The ship tail gas enters a washing tower, and the unburned heavy oil, particulate matters and acidic washing liquid in the gas are used for removing SO in the tail gas2The sulfite and the sulfate which are formed by dissolving in the water together form the desulfurization washing waste water which needs to be treated. Therefore, an efficient waste gas desulfurization washing water treatment process needs to be designed to perform timing treatment on desulfurization washing water SO as to achieve the aim that IMO discharges pH, PAHs, turbidity and SO about washing waterXAnd total oil and the like, and reaches the corresponding sewage discharge standard.
In some ship wastewater treatment devices and methods, an adsorption column adsorption method is often adopted, and although the technology has certain effect on recycling of desulfurization wastewater, the following problems are more: the occupied area is large; the failure rate of the equipment is high; the pretreatment process is complicated. The treatment capacity of the adsorption column and the flow rate of the adsorption water are closely related, so that the treatment capacity of the desulfurization washing wastewater is limited while the emission standard of the desulfurization washing wastewater is met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a system and a process for carrying out air floatation and ultrafiltration treatment on the ship tail gas desulfurization washing wastewater.
In order to achieve the above object, the present invention provides an air-flotation ultrafiltration treatment system for ship tail gas desulfurization washing wastewater, comprising:
a neutralization oxidation apparatus comprising: the system comprises a sodium-alkali tank, a PAC tank, a PAM tank, an air blower for conveying air and an ultraviolet disinfection lamp;
air floatation equipment;
ultrafiltration equipment;
a sludge tank;
a plate-and-frame filter press;
the first pressurizing and lifting pump is connected with the neutralization oxidation equipment and the air floatation equipment;
the second pressurization lift pump is connected with the air floatation equipment and the ultrafiltration equipment; the lower layer waste liquid obtained after the wastewater is treated by the air floatation equipment is sent to the ultrafiltration equipment;
the sludge discharge pipe is connected with the air floatation equipment and the sludge tank; after the wastewater is treated by the air floatation equipment, floating oil and waste residue are sent into the sludge tank;
the sludge lifting pump is connected with the sludge tank and the plate-and-frame filter press;
and the waste water return pipe is connected with the neutralization oxidation equipment and the ultrafiltration equipment, and the concentrated high-concentration waste water flows back to the neutralization oxidation equipment for retreatment.
Preferably, the system further comprises: and the sodium hydroxide peristaltic pump is connected with the sodium alkali tank.
Preferably, the neutralization and oxidation apparatus further comprises: a pH feedback device; the system adjusts the flow rate of the sodium hydroxide peristaltic pump according to the value provided by the pH feedback device.
Preferably, the sodium alkali tank is arranged at the top of the neutralization oxidation equipment.
Preferably, the neutralization and oxidation apparatus further comprises: a gas-liquid mixing nozzle for stirring; and air conveyed by the blower is conveyed to the gas-liquid mixing nozzle.
Preferably, the blower is arranged at the bottom of the neutralization oxidation equipment.
Preferably, the ultraviolet disinfection lamp is arranged at two sides of the top of the neutralization oxidation device.
Preferably, the air floatation device comprises a slag scraper.
Preferably, the ultrafiltration equipment adopts a tubular ceramic membrane.
The invention also provides an air-flotation ultrafiltration treatment process for the ship tail gas desulfurization washing wastewater, which adopts the air-flotation ultrafiltration treatment system for the ship tail gas desulfurization washing wastewater to treat the wastewater; the process comprises the following steps:
s1, feeding the desulfurization washing wastewater into the neutralization oxidation equipment, and feeding the treated wastewater into the air floatation equipment by using the first pressurization lifting pump;
s2, in the air floatation device, the waste water is divided into floating oil and waste residue and lower layer waste liquid, the floating oil and waste residue are sent into the sludge tank through the sludge discharge pipe, and the lower layer waste liquid is sent into the ultrafiltration device through the second pressurization lifting pump;
s3, the waste residue in the sludge tank enters the plate-and-frame filter press through the sludge lifting pump for dehydration;
and S4, treating the waste liquid by the ultrafiltration equipment, discharging the treated water meeting the discharge standard, and refluxing the concentrated high-concentration wastewater to the neutralization oxidation equipment for retreatment.
Compared with the prior art, the invention has the beneficial effects that:
the whole process finishes the adjustment of pH and the oxidation of SO only in a neutralization oxidation device3 2-Meanwhile, the purpose of fully mixing the wastewater with PAC and PAM can be realized in neutralization and oxidation equipment, so that a large amount of space is saved; the ultrafiltration process is directly used after the primary air floatation process, so that compared with the traditional process, the process is simplified, the occupied area is reduced, and the cost is reduced; the ultrafiltration equipment adopts tubular ceramic membrane, and has the advantages of large filtration flux, high efficiency, low cost, long service life of membrane, convenient cleaning, and same effluent qualityCan reach the discharge standard of the desulfurization washing wastewater and meet the requirements of IMO on pH, PAHs, turbidity and SO in the effluent quality of the desulfurization washing water of the tail gas of the shipXAnd total oil, etc.
Drawings
FIG. 1 is a simplified schematic diagram of the air flotation ultrafiltration treatment system and process for the ship tail gas desulfurization washing wastewater of the present invention.
FIG. 2 is a schematic view of an embodiment of an air flotation ultrafiltration treatment system for wastewater from desulfurization and washing of marine exhaust gas.
Description of reference numerals:
1. a blower; 2. a control valve; 3. a water inlet pipe; 4. a pH feedback device; 5. a first water inlet; 6. a sodium hydroxide metering peristaltic pump; 7. a sodium alkali tank; 8. a PAC tank; 9. a PAM tank; 10. a dosing metering peristaltic pump; 11. a gas-liquid mixing nozzle; 12. a neutralization oxidation device; 13. a first water outlet; 14. an air inlet; 15. an ultraviolet disinfection lamp; 16. an air flow meter; 17. an intake flow control valve; 18. a first booster lift pump; 19. a first pressure gauge; 20. air floatation equipment; 21. a second water inlet; 22. a sludge outlet; 23. a second water outlet; 24. a sludge tank; 25. a slag scraper; 26. a second booster lift pump; 27. a sludge discharge pipe; 28. a second pressure gauge; 29. a concentrated water return pipe; 30. ultrafiltration equipment; 31. a concentrated water outlet; 32. a third water outlet; 33. a water outlet pipe; 34. a third water inlet; 35. a sludge lift pump; 36. and (4) a plate-and-frame filter press.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Fig. 1 is a simplified schematic diagram of an air flotation ultrafiltration treatment process of ship tail gas desulfurization washing wastewater according to the invention. The air-flotation ultrafiltration treatment process for the ship tail gas desulfurization washing wastewater comprises the following steps:
(1) the desulfurization washing wastewater enters a box body of neutralization oxidation equipment through a water inlet pipe, air is conveyed from the bottom of the box body through an air blower, gas-liquid phases are conveyed to a gas-liquid mixing nozzle arranged in the equipment, sodium hydroxide, PAC and PAM are added through a medicine adding tank on the water inlet pipe and a sodium-alkali tank at the top of the neutralization oxidation equipment, the gas-liquid mixing nozzle is used for achieving the effects of stirring and oxidation, ultraviolet disinfection lamps are arranged on two sides of the top in the box body, the sterilization effect is achieved, and the bacterial hazard is reduced;
(2) feeding the desulfurization washing wastewater subjected to oxidation flocculation into an air floatation device by using a first pressurization lifting pump, separating floating oil and waste residue from water by using a residue scraper, feeding the oil and the waste residue into a sludge tank through a sludge discharge pipe, and feeding the lower-layer waste liquid into an ultrafiltration device by using a second pressurization lifting pump;
(3) sludge in the sludge tank enters a plate-and-frame filter press through a sludge lifting pump for dehydration, and the dehydrated dry sludge can be directly transported out;
(4) the liquid after ultrafiltration meets the discharge standard and is directly discharged through a drain pipe, and the concentrated high-concentration wastewater flows back to a neutralization oxidation device for retreatment.
In the step (1), a sodium-alkali tank is arranged at the upper part of a box body of the neutralization oxidation equipment, a PAC tank and a PAM tank are arranged on a water inlet pipe, the sodium-alkali tank is connected with the neutralization oxidation equipment through a sodium hydroxide peristaltic pump, a pH feedback device is arranged in the neutralization oxidation equipment, and the flow of the sodium-alkali tank peristaltic pump is adjusted according to a numerical value provided by the pH feedback device, so that the pH value of the wastewater in the neutralization oxidation equipment is stabilized at 6.5-8.5; the PAC tank and the PAM tank are connected to the water inlet pipe through a dosing peristaltic pump; the bottom of the box body of the neutralization oxidation equipment is provided with an air inlet, a pipeline of the blower connected with the air inlet is provided with a gas flow meter and a gas flow control valve which can control the flow of the inlet air, gas phase and liquid phase enter the neutralization oxidation equipment through a gas-liquid mixing nozzle in the equipment for further stirring and oxidation, and the SO in the neutralization oxidation equipment is neutralized by using oxygen in the air3 2-Is completely oxidized into SO4 2-(ii) a Ultraviolet disinfection lamps are arranged on two sides of the top inside the neutralization oxidation equipment, and the sterilization and disinfection effects are achieved.
In the step (2), the desulfurization washing wastewater after oxidation and flocculation is sent into air floatation equipment through a first pressurization lifting pump, a first pressure gauge is arranged behind the first pressurization lifting pump to ensure that normal pressure is met, a slag scraper is arranged on the upper portion of the liquid level in the air floatation equipment to separate floating waste residues, oil and water, and the waste residues, the oil and the water are sent into a sludge tank through a sludge discharge pipe; the lower layer waste liquid is sent into the ultrafiltration equipment by a second pressurizing and lifting pump.
And (3) in the step (3), the sludge in the sludge tank enters a plate-and-frame filter press through a sludge lifting pump for dehydration, and the dehydrated dry sludge can be directly transported out.
In the step (4), a second pressure gauge is arranged behind the second pressurizing lift pump, the waste liquid meets the discharge standard after being ultrafiltered by ultrafiltration equipment under the condition of meeting normal pressure and is directly discharged through a drain pipe, and the concentrated high-concentration waste water flows back to neutralization oxidation equipment for retreatment.
The gas-liquid mixing nozzle at the bottom of the neutralization oxidation equipment can fully stir the wastewater and fully mix the wastewater with PAC and PAM, the ultraviolet disinfection lamps at two sides of the top end inside the neutralization oxidation equipment can reduce harmful bacteria in the wastewater, and the process only completes the pH regulation and SO oxidation in the neutralization oxidation equipment3 2-Compared with the traditional process in which regulation, neutralization and oxidation are respectively carried out, the process equipment has a compact structure and occupies small area.
And the desulfurization washing wastewater after the oxidation and flocculation is sent into an air floatation device by using a first pressurization lifting pump, the floating oil and the waste residue are separated from water by a residue scraper and are sent into a sludge tank through a sludge discharge pipe, and the lower layer waste liquid is sent into an ultrafiltration device by using the pressurization lifting pump to realize solid-liquid separation.
The traditional process needs a two-stage air flotation process and a three-stage air flotation process, and the process directly uses an ultrafiltration process after the first-stage air flotation process, so that compared with the traditional process, the process is simplified, the occupied area is reduced, and the cost is reduced.
The process ultrafiltration equipment adopts the tubular ceramic membrane, has large filtration flux, high efficiency, low cost, long service life of the membrane, convenient cleaning and large floor area saving, and the effluent quality can also reach the discharge standard of desulfurization washing wastewater.
Examples
As shown in figure 2, desulfurization washing wastewater firstly enters a box body of a neutralization oxidation device 12 from a first water inlet 5 through a water inlet pipe 3, the pH of the desulfurization wastewater is adjusted by automatically adding sodium hydroxide from a sodium-alkali tank 7 through a sodium hydroxide metering peristaltic pump 6 through a pH feedback device 4, PAC and PAM are added from a PAC tank 8 and a PAM tank 9 through a dosing metering peristaltic pump 10, an air inlet 14 is arranged at the bottom of the box body of the neutralization oxidation device 12, air is conveyed into the box body of the neutralization oxidation device 12 from the air inlet 14 through an air blower 1 after a control valve 2 is opened, an air flow meter 16 and an air inlet flow control valve 17 are arranged in front of the air inlet 14, the air inlet flow can be controlled, liquid phase and gas phase are stirred, flocculated and oxidized in the neutralization oxidation device 12 through a gas-liquid mixing nozzle 11 at the bottom of the neutralization oxidation device 12, ultraviolet disinfection lamps 15 at two sides of the top in, reducing harmful bacteria. The wastewater treated by the neutralization oxidation equipment 12 flows out of the first water outlet 13.
The desulfurization washing wastewater after oxidation and flocculation is sent into the air floatation device 20 through the second water inlet 21 by utilizing the first pressurizing lift pump 18, the first pressure gauge 19 is arranged behind the first pressurizing lift pump 18, the water inlet pressure can be controlled, the floating oil and the waste residue are separated from water by the residue scraper 25 at the top of the air floatation device 20 and are sent into the sludge tank 24 from the sludge outlet 22 through the sludge discharge pipe 27, and the lower-layer waste liquid is discharged from the second water outlet 23.
Sludge in the sludge tank 24 enters the plate-and-frame filter press 36 through the sludge lifting pump 35 for dehydration, and the dehydrated dry sludge can be directly transported out.
Waste liquid discharged from the lower layer of the air floatation device 20 is sent into the ultrafiltration device 30 through the third water inlet 34 by the second pressurizing lift pump 26, the second pressure gauge 28 is arranged behind the second pressurizing lift pump 26, the water inlet pressure value of the ultrafiltration device 30 can be controlled, the waste liquid meets the discharge standard after being ultrafiltered by the ultrafiltration device 30 under the condition of meeting the normal pressure and is directly discharged through the third water outlet 32 through the water outlet pipe 33, and the concentrated high-concentration waste water is returned to the neutralization oxidation device 12 through the concentrated water outlet 31 and the concentrated water return pipe 29 for retreatment.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. The utility model provides a boats and ships tail gas desulfurization washing waste water air supporting ultrafiltration processing system which characterized in that contains:
a neutralization oxidation apparatus comprising: the system comprises a sodium-alkali tank, a PAC tank, a PAM tank, an air blower for conveying air and an ultraviolet disinfection lamp;
air floatation equipment;
ultrafiltration equipment;
a sludge tank;
a plate-and-frame filter press;
the first pressurizing and lifting pump is connected with the neutralization oxidation equipment and the air floatation equipment;
the second pressurization lift pump is connected with the air floatation equipment and the ultrafiltration equipment; the lower layer waste liquid obtained after the wastewater is treated by the air floatation equipment is sent to the ultrafiltration equipment;
the sludge discharge pipe is connected with the air floatation equipment and the sludge tank; after the wastewater is treated by the air floatation equipment, floating oil and waste residue are sent into the sludge tank;
the sludge lifting pump is connected with the sludge tank and the plate-and-frame filter press;
and the waste water return pipe is connected with the neutralization oxidation equipment and the ultrafiltration equipment, and the concentrated high-concentration waste water flows back to the neutralization oxidation equipment for retreatment.
2. The air flotation ultrafiltration treatment system for the ship tail gas desulfurization washing wastewater as claimed in claim 1, further comprising: and the sodium hydroxide peristaltic pump is connected with the sodium alkali tank.
3. The air flotation and ultrafiltration treatment system for the wastewater of the desulfurization and washing of marine exhaust gas according to claim 2, wherein the neutralization and oxidation equipment further comprises: a pH feedback device; the system adjusts the flow rate of the sodium hydroxide peristaltic pump according to the value provided by the pH feedback device.
4. The air-flotation ultrafiltration treatment system for the marine tail gas desulfurization washing wastewater as recited in claim 1, wherein the sodium-alkali tank is arranged at the top of the neutralization oxidation device.
5. The air flotation and ultrafiltration treatment system for the wastewater of the desulfurization and washing of marine exhaust gas according to claim 1, wherein the neutralization and oxidation equipment further comprises: a gas-liquid mixing nozzle for stirring; and air conveyed by the blower is conveyed to the gas-liquid mixing nozzle.
6. The air flotation and ultrafiltration treatment system for the marine tail gas desulfurization and washing wastewater as recited in claim 5, wherein the blower is disposed at the bottom of the neutralization oxidation device.
7. The air-flotation ultrafiltration treatment system for the marine tail gas desulfurization washing wastewater as recited in claim 1, wherein the ultraviolet disinfection lamps are arranged at two sides of the top of the neutralization oxidation device.
8. The air-flotation ultrafiltration treatment system for the ship tail gas desulfurization washing wastewater as claimed in claim 1, wherein the air-flotation device comprises a slag scraper.
9. The air-flotation ultrafiltration treatment system for the ship tail gas desulfurization washing wastewater as recited in claim 1, wherein the ultrafiltration equipment is a tubular ceramic membrane.
10. An air-flotation ultrafiltration treatment process for ship tail gas desulfurization washing wastewater, which is characterized in that the ship tail gas desulfurization washing wastewater air-flotation ultrafiltration treatment system of any one of claims 1 to 9 is adopted to treat the wastewater; the process comprises the following steps:
s1, feeding the desulfurization washing wastewater into the neutralization oxidation equipment, and feeding the treated wastewater into the air floatation equipment by using the first pressurization lifting pump;
s2, in the air floatation device, the waste water is divided into floating oil and waste residue and lower layer waste liquid, the floating oil and waste residue are sent into the sludge tank through the sludge discharge pipe, and the lower layer waste liquid is sent into the ultrafiltration device through the second pressurization lifting pump;
s3, the waste residue in the sludge tank enters the plate-and-frame filter press through the sludge lifting pump for dehydration;
and S4, treating the waste liquid by the ultrafiltration equipment, discharging the treated water meeting the discharge standard, and refluxing the concentrated high-concentration wastewater to the neutralization oxidation equipment for retreatment.
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