CN102874993B - Sterilizing type coking wastewater advanced treatment process and sterilizing type coking wastewater advanced treatment device - Google Patents
Sterilizing type coking wastewater advanced treatment process and sterilizing type coking wastewater advanced treatment device Download PDFInfo
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Abstract
The invention discloses a sterilizing type coking wastewater advanced treatment process and a sterilizing type coking wastewater advanced treatment device. The process is as follows: wastewater is introduced into a mixing-sinking tank, so that COD (Chemical Oxygen Demand) and suspended matters in the wastewater can be reduced, secondly, the wastewater is introduced into a multi-media filter to be further filtered, then the filtered wastewater is introduced into a three-dimensional electrode reactor of a fluidized bed to be subjected to electrocatalytic oxidation and then is introduced into an MBR (Membrane Bio-Reactor), then the wastewater discharged from the MBR can be directly used as low-level water, and also the wastewater can continue to be subjected to the advanced treatment, and enters a cartridge filter, so that the suspended matters and activated sludge in the wastewater can be removed, and finally the wastewater enters an ultraviolet sterilizing device and a reverse osmosis device, and the treated produced water can be in the high-level. The device mainly comprises the mixing-sinking tank, the multi-media filter, the three-dimensional electrode reactor of the fluidized bed, the MBR, the cartridge filter, the ultraviolet sterilizing device and the reverse osmosis device. According to the process and the device, the design is reasonable, the difficulties of the advanced treatment and the reuse of coking wastewater can be solved, the engineering application value is extremely strong, and the produced water can meet the requirement of different levels of water.
Description
Technical field
The present invention relates to environmental technology field, refer to particularly a kind of sterilizing type advanced treatment process of coking waste water and equipment thereof.
Background technology
Coking chemical waste water is a kind of trade effluent of generally acknowledged difficult for biological degradation, its difficulty is that the biodegradability of waste water is poor, except inorganic pollution beyond the region of objective existences such as ammonia, cyanogen and thiocyanates, also contain the heterocycles such as phenols, naphthalene, pyridine, quinoline and polycyclc aromatic compound (PAHS) etc. and be difficult to biodegradable goods and materials, these materials can produce long-range effects to environment, and the studied carcinogenic substance that turns out to be of part, ammonia nitrogen in high density has very strong restraining effect to microorganism active in addition, and Nitrogen removal effect is not good.At present, coking wastewater processing system generally includes conventional two stages for the treatment of.Coagulation refers to recycles pollutent from high-concentration sewage, and its technique comprises ammonia distillation, ammoniacal liquor dephenolize, whole cold water decyanation etc., is preprocessing process.Second-stage treatment refers to phenol-cyanogen sewage harmless treatment, take activated sludge process as main, also comprises enhanced biological treatment technology etc.Due to further advanced treatment somewhat expensive, make domestic many coke-oven plants hang back, so most coking chemical waste water has only just directly discharged through conventional two stages for the treatment of.But waste water after above-mentioned processing wherein some poisonous and harmful substances (prussiate, COD and heterogeneous ring compound etc.) still do not reach country allow emission standard.
At present, the outstanding problem that advanced treatment process of coking waste water exists is as follows: one, by chemical agent advanced treatment of waste water, and the method may be introduced secondary pollution, or causes and increase follow-up desalination expense; Two, coking chemical waste water is used for to wet quenching or blast furnace slag flushing, but transfer has occurred Pollutants in Wastewater, operating environment is poor simultaneously, has the problem such as pipe network and equipment corrosion; Three, the dense water whereabouts after embrane method desalination advanced treatment is also to need the problem of solution badly.
In order to promote industrial structure upgrading, standard industry healthy development, to promote energy-saving and emission-reduction and technical progress, Ministry of Industry and Information of China has promulgated No. 15 files of " coking industry entry criteria (2008 revision) " on December 19th, 2008, and clearly define: after wastewater containing phenol and cyanide processing is qualified, will recycle, must not arrange outward.Therefore, it is to improve waste water circulation rate, reduce wastewater disposition, reduce the optimal selection of new water consumption that coking chemical waste water is carried out to advanced treatment and reuse, and seeks one efficiently, advanced treatment and reuse technology are the active demands of current coking wastewater deep treatment process cheaply.
Summary of the invention
Object of the present invention will change traditional coking waste water treatment process exactly, and a kind of economic, practical, efficient sterilizing type advanced treatment process of coking waste water and equipment thereof are provided.It integrates electro-catalytic oxidation technology, membrane bioreaction technology, ultraviolet-sterilization technology and reverse osmosis technology, can effectively avoid the secondary pollution that adopts the processing waste water such as other chemical agents to cause, reduces the processing cost of coking chemical waste water, saves a large amount of water of productive use.
For achieving the above object, sterilizing type advanced treatment process of coking waste water provided by the invention, is the process to processing again through conventional Two-Stage Biochemical coking chemical waste water after treatment, and this technique comprises the steps:
1) by being delivered to through the coking chemical waste water of Two-Stage Biochemical processing in mixed heavy pond, make it under the effect of flocculation agent and coagulant aids, carry out precipitation process, obtain the waste water after precipitation;
2) waste water after precipitation is delivered in more medium filter and carries out filtration treatment, further to reduce mud, the concentration of suspension in waste water, obtain filtering rear waste water;
3) waste water after filtration is delivered in fluid bed three-dimensional electrode reactor and carries out electrocatalysis oxidation reaction, impel the organic substance of bio-refractory in waste water be oxidized by hydroxyl radical free radical and larger molecular organics and arene compound are degraded into small molecules or CO
2, the waste water after being oxidized;
4) waste water after oxidation is delivered in MBR membrane bioreactor and carries out continuous aeration processing, so that the further biochemical degradation of small molecules wherein is also held back part mud, suspended substance simultaneously;
5) will be through continuous aeration waste water after treatment directly as defoamer water, coal yard dust suppression water, reclaimed water or other inferior grade water in biological process; Or:
6) will be delivered to further filtration treatment in cartridge filter through continuous aeration waste water after treatment, with wherein active sludge and the suspended substance of the overwhelming majority of filtering;
7) waste water after security personnel filter is delivered in ultraviolet sterilization device and carries out sterilization, to remove microorganism, the bacterium in waste water;
8) waste water after sterilization is delivered to and in reverse osmosis unit, carries out desalination processing, gained desalination waste water recycling is made technique recirculated cooling water or other high-grade water, and reverse osmosis dense water out can be used as the cooling flushing cinder water of blast-furnace slag, coal yard dust suppression water, road-cleaning water or other inferior grade waters.
As preferred version, in described step 1), flocculation agent adopts polymeric ferrous sulphate solution and/or polymeric aluminum chlorides solution, and the concentration after its interpolation in waste water is 200 ~ 800mg/L, coagulant aids adopts polyacrylamide, and the concentration after its interpolation in waste water is 0.5 ~ 10mg/L.
As preferred version, described step 2) in, the filtrate in more medium filter adopts hard coal, the haydite of 3 ~ 6mm and three layers of combination of the quartz sand of 4 ~ 10mm that particle diameter is 0.5 ~ 2mm.
As preferred version, in described step 3), the granule electrode of fluid bed three-dimensional electrode reactor adopts the coke granule of metallizing compound, and its current density is that 20 ~ 100mA/cm2, the waste water residence time is therein 30 ~ 60min.
As preferred version, in described step 4), the aeration intensity in MBR membrane bioreactor is controlled at 0.15 ~ 0.5m
3/ h, dissolved oxygen concentration are that 1.5 ~ 8mg/L, film cleaning interval are 10 ~ 15d.
The sterilizing type coking wastewater deep treatment equipment designing for realizing above-mentioned technique, comprise mixed heavy pond, more medium filter, fluid bed three-dimensional electrode reactor, MBR membrane bioreactor, cartridge filter, ultraviolet sterilization device and reverse osmosis unit, its special character is: the coking chemical waste water outlet in described mixed heavy pond is connected with the import of more medium filter, the outlet of described more medium filter is connected with the waste water input terminus of fluid bed three-dimensional electrode reactor, the air input terminus of described fluid bed three-dimensional electrode reactor is connected with gas blower, the waste water output terminal of described fluid bed three-dimensional electrode reactor is connected with the water-in of MBR membrane bioreactor, the aeration opening of described MBR membrane bioreactor is connected with aeration pump, the water outlet of described MBR membrane bioreactor is connected with the import of cartridge filter by suction pump, the outlet of described cartridge filter is connected with the input aperture of ultraviolet sterilization device, the delivery port of described ultraviolet sterilization device is connected with the former water input terminus of reverse osmosis unit.
As preferred version, described fluid bed three-dimensional electrode reactor comprises cell body, in described cell body, be provided with sealing support frame, described sealing support frame middle part is provided with air distribution plate, in the cell body of described air distribution plate below, be provided with aerator, the air input terminus of described aerator is connected with gas blower; In the cell body of described aerator below, be provided with water distributor, the waste water input terminus of described water distributor is connected with the outlet of more medium filter; Described sealing support frame top is provided with negative electrode and positive electrode, in described negative electrode and positive electrode cell body around, be scattered with fluidised granule electrode, the top waste water output terminal of described cell body is provided with the hole plate for preventing that granule electrode from escaping, and described hole plate communicates with the water-in of MBR membrane bioreactor.
Further, the spacing of described air distribution plate and aerator is 5 ~ 25mm, and the qi-emitting hole diameter on described air distribution plate is 1 ~ 2mm; Ventilating pit diameter on described aerator is 2 ~ 5mm; Posticum diameter on described water distributor is 2 ~ 5mm.
Further, described negative electrode and positive electrode are tabular or cylinder-like structure, or the reticulated structure corresponding with above-mentioned shape; Described granule electrode adopts the coke granule that is coated with metallic compound that particle diameter is 2 ~ 10mm.
Again further, described MBR membrane bioreactor comprises reaction tank body, the water-in of described reaction tank body is connected with the waste water output terminal of fluid bed three-dimensional electrode reactor, in described reaction tank body, be set side by side with immersion MBR membrane module, the aeration opening of described immersion MBR membrane module is connected with aeration pump, the water outlet of described MBR membrane module is connected with suction pump, and the sewage draining exit of described reaction tank body is connected with residual sea water pump.
Compared with prior art, tool of the present invention has the following advantages:
One, this technique and equipment thereof are reasonable in design, can further degrade to the hardly degraded organic substance in coking biochemical system, meet the needs of follow-up MBR membrane bioreactor biochemical treatment.Simultaneously, more medium filter, MBR membrane bioreactor, cartridge filter have significantly reduced the suspended substance in waste water, no matter be to fluid bed three-dimensional electrode reactor degradation efficiency, or to extending the work-ing life of ultraviolet sterilization device, reverse osmosis unit, all obtain increasing substantially, guarantee that running cost is cheap, solved the difficult problem in coking wastewater deep treatment and reuse, there is very strong engineering using value.
Its two, this technique and operation of equipment thereof are simple, running cost is lower, effluent quality can meet the requirement of different grades water.
They are three years old, this technique and equipment thereof have carried out the lab scale test of 25L/h in Metallurgical Waste Water recycle laboratory, experiment effect proves: it can meet the requirement of coking wastewater deep treatment and reuse, COD clearance can reach more than 80%, waste water for specific conductivity between 300 ~ 2000 μ s/cm, its desalination rate can reach 90%, obtains water rate in 30 ~ 70% left and right, total heterotrophic bacteria count is less than 1 × 105/ml, and cost for wastewater treatment per ton is 4 ~ 6 yuan of left and right.
Accompanying drawing explanation
Fig. 1 is the structural representation of sterilizing type coking wastewater deep treatment equipment of the present invention.
Fig. 2 is the main TV structure schematic diagram of fluid bed three-dimensional electrode reactor in Fig. 1.
Fig. 3 is that A-A of Fig. 2 analyses and observe structure for amplifying schematic diagram.
Fig. 4 is the main TV structure schematic diagram of MBR membrane bioreactor in Fig. 1.
Fig. 5 is that advanced treatment device shown in Fig. 1 is to the UV spectral scan figure before and after Treatment of Coking Effluent.
In figure: mixed heavy pond 1, more medium filter 2, fluid bed three-dimensional electrode reactor 3(is wherein: water distributor 301, cell body 302, granule electrode 303, negative electrode 304, positive electrode 305, hole plate 306, sealing support frame 307, air distribution plate 308, aerator 309), MBR membrane bioreactor 4(is wherein: reaction tank body 401, immersion MBR membrane module 402, residual sea water pump 403), cartridge filter 5, ultraviolet sterilization device 6, gas blower 7, aeration pump 8, suction pump 9, mud vent pipe 10, concentrated water drainage goes out pipe 11, produce water discharge pipe 12, reverse osmosis unit 13, coking chemical waste water input tube 14, flocculation agent adds mouth 15, sludge outlet 16, coking water outlet UV spectral scan curve m, coking water inlet UV spectral scan curve n.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, sterilizing type coking wastewater deep treatment equipment of the present invention, comprise mixed heavy pond 1, more medium filter 2, fluid bed three-dimensional electrode reactor 3, MBR membrane bioreactor 4, cartridge filter 5, ultraviolet sterilization device 6 and reverse osmosis unit 13, the coking chemical waste water outlet in mixed heavy pond 1 is connected with the import of more medium filter 2, the outlet of more medium filter 2 is connected with the waste water input terminus of fluid bed three-dimensional electrode reactor 3, the air input terminus of fluid bed three-dimensional electrode reactor 3 is connected with gas blower 7, the waste water output terminal of fluid bed three-dimensional electrode reactor 3 is connected with the water-in of MBR membrane bioreactor 4, the aeration opening of MBR membrane bioreactor 4 is connected with aeration pump 8, the water outlet of MBR membrane bioreactor 4 is connected with the import of cartridge filter 5 by suction pump 9, the outlet of cartridge filter 5 is connected with the input aperture of ultraviolet sterilization device 6, the delivery port of ultraviolet sterilization device 6 is connected with the former water input terminus of reverse osmosis unit 13.
As shown in Figures 2 and 3, above-mentioned fluid bed three-dimensional electrode reactor 3 comprises cell body 302, in cell body 302, be provided with sealing support frame 307, sealing support frame 307 middle parts are provided with air distribution plate 308, in the cell body 302 of air distribution plate 308 belows, be provided with aerator 309, the air input terminus of aerator 309 is connected with gas blower 7; In the cell body 302 of aerator 309 belows, be provided with water distributor 301, the waste water input terminus of water distributor 301 is connected with the outlet of more medium filter 2; Sealing support frame 307 tops are provided with negative electrode 304 and positive electrode 305, in negative electrode 304 and positive electrode 305 cell body 302 around, be scattered with fluidised granule electrode 303, the top waste water output terminal of cell body 302 is provided with the hole plate 306 for preventing that granule electrode 303 from escaping, and hole plate 306 communicates with the water-in of MBR membrane bioreactor 4.Air distribution plate 308 is 5 ~ 25mm with the spacing of aerator 309, and the qi-emitting hole diameter on air distribution plate 308 is 1 ~ 2mm; Ventilating pit diameter on aerator 309 is 2 ~ 5mm; Posticum diameter on water distributor 301 is 2 ~ 5mm.In the present embodiment, negative electrode 304 and the preferred plate-like structure of positive electrode 305, can certainly adopt cylinder-like structure, or the reticulated structure corresponding with above-mentioned shape.The coke granule that is coated with metallic compound that granule electrode 303 preferable particle size are 2 ~ 10mm, this metallic compound refers to the nitrate of carrying transition metal (as Ni, Fe, Cu, Co, Mn, Zn), as Ni (NO
3)
2, Fe (NO
3)
3, Cu (NO
3)
2, Co (NO
3)
2and Mn (NO
3)
2,zn (NO
3)
2deng one or more.
As shown in Figure 4, above-mentioned MBR membrane bioreactor 4 comprises reaction tank body 401, the water-in of reaction tank body 401 is connected with the waste water output terminal of fluid bed three-dimensional electrode reactor 3, in reaction tank body 401, be set side by side with immersion MBR membrane module 402, the aeration opening of immersion MBR membrane module 402 is connected with aeration pump 8, and the water outlet of MBR membrane module 402 is connected with suction pump 9, and the sewage draining exit of reaction tank body 401 is connected with residual sea water pump 403, residual sea water pump 403 is submersible pump, is arranged in reaction tank body 401.
The principle of work of above-mentioned sterilizing type coking wastewater deep treatment equipment is as follows: the active sludge in waste water after treatment Two-Stage Biochemical is carried out flocculation sediment by mixed heavy pond 1, reduces COD and suspended substance in waste water.More medium filter 2 can further reduce the concentration of suspension in waste water, reduces the material such as clay that pole plate adheres to, and also reduces the impact to fluid bed three-dimensional electrode reactor 3 simultaneously, extends electrode life, guarantees fluid bed three-dimensional anodizing efficiency.Fluid bed three-dimensional electrode reactor 3 impels the organic substance of bio-refractory in coking chemical waste water to be oxidized by hydroxyl radical free radical, and larger molecular organics in waste water and arene compound are degraded into small molecules or CO
2.MBR membrane bioreactor 4 mainly by high-concentration activated sludge to the further biochemical degradation of micromolecular compound, also hold back partial suspended thing simultaneously.Cartridge filter 5 mainly further filters MBR membrane bioreactor 4 partial suspended thing out, meets the water inlet requirement of reverse osmosis unit system.Ultraviolet sterilization device 6 is mainly that microorganism, the bacterium to containing in waste water after MBR water outlet carries out germicidal treatment, prevents from nourishing and causing film to pollute or stop up on reverse osmosis membrane system bacterium.Reverse osmosis unit 13, mainly to the further advanced treatment of waste water, sterilization, desalination, removal part COD, makes effluent quality can meet the requirement of different grades water.Inferior grade water can be directly used as from MBR membrane bioreactor 4 waste water out, such as defoamer water, coal yard dust suppression etc. in deepening process; From the concentrated water drainage of reverse osmosis unit 13 go out that pipe 11 dense water out can be directly used in that blast-furnace slag is cooling, flushing cinder water, coal yard dust suppression etc., can reuse make technique recirculated cooling water or other high-grade water from the product water discharge pipe 12 of reverse osmosis unit 13 product water out.
The specific works process of above-mentioned sterilizing type coking wastewater deep treatment equipment is as follows: in the coking chemical waste water of processing to need in-depth, add flocculation agent and coagulant aids, flocculation agent adopts polymeric ferrous sulphate solution and/or polymeric aluminum chlorides solution, concentration after its interpolation in waste water is 200 ~ 800mg/L, coagulant aids adopts polyacrylamide, and the concentration after its interpolation in waste water is 0.5 ~ 10mg/L.Then waste water is introduced to pond, mixed shallow lake 1, reduced COD and suspended substance in part waste water.Through pond, mixed shallow lake, 1 processed waste water enters more medium filter 2, filtrate in more medium filter 2 adopts hard coal, the haydite of 3 ~ 6mm and three layers of combination of the quartz sand of 4 ~ 10mm that particle diameter is 0.5 ~ 2mm, after further filtering, be delivered to fluid bed three-dimensional electrode reactor 3, the interior required air of fluid bed three-dimensional electrode reactor 3 comes from gas blower 7, and the current density of fluid bed three-dimensional electrode reactor 3 is 20 ~ 100mA/cm
2, the waste water residence time is therein 30 ~ 60min, after catalytic oxidation, waste water enters MBR membrane bioreactor 4.
MBR membrane bioreactor 4 adopts immersion structure, and aeration form adopts aeration pump 8 continuous aerations, and aeration intensity is controlled at 0.15 ~ 0.5m
3/ h, dissolved oxygen (DO) concentration is 1.5 ~ 8mg/L, the film cleaning interval is 10 ~ 15d.Mud adopts the mud that in coke-oven plant's biochemical treatment process, Aerobic Pond refluxes, object be by high-concentration activated sludge to the further biochemical degradation of micromolecular compound, also hold back partial suspended thing simultaneously.Waste water enters after MBR membrane bioreactor 4, water after aerobic aeration and biological treatment, by suction pump 9 by extracting out after membrane filtration, mud is sucked from mud vent pipe 10 and is discharged by residual sea water pump 403, together be discharged to mud centralized pool with the mud in mixed heavy pond 1, after digestion, machinery is drawn and is dug outward transport, and supernatant liquor passes back into mixed heavy pond 1.
The waste water of being extracted out by suction pump 9 can directly be used as inferior grade water, such as defoamer water, coal yard dust suppression etc. in deepening process, also can continue advanced treatment and enter cartridge filter 5, cartridge filter 5 operation scheme adopt backwash type, inlet outlet pressure differential is greater than 0.15MPa, its objective is and will further filter from MBR membrane bioreactor 4 partial suspended thing out, reduce the impact to reverse osmosis membrane in follow-up reverse osmosis unit 13.
Waste water is after cartridge filter 5 is removed suspended substance and active sludge; enter again ultraviolet sterilization device 6; ultraviolet sterilization device 6 adopts modularized equipment; object is that microorganism, the bacterium to containing in waste water carries out germicidal treatment; prevent that bacterium nourishing causes film to pollute or stops up in reverse osmosis unit 13, play the effect of reverse osmosis membrane in protection reverse osmosis unit 13.
After waste water carries out germicidal treatment through ultraviolet sterilization device 6 to microorganism, bacterium, enter reverse osmosis unit 13, reverse osmosis unit 13 also adopts modularized equipment, and object is to the further advanced treatment desalination of waste water, remove part COD, make effluent quality can meet the requirement of different grades water.From reverse osmosis unit 13 dense water out for cooling, the flushing cinder water of blast-furnace slag, coal yard dust suppression etc., from reverse osmosis unit 13 product water out as high-grade water, as the moisturizing of circulating cooling system etc.
Figure 5 shows that in the invention process process, the UV spectral scan curve (being UV scanning curve) before and after Treatment of Coking Effluent, in figure: m is coking water outlet UV spectral scan curve, n is coking water inlet UV spectral scan curve.From the curve of Fig. 5, can find out, after present device advanced treatment, the absorbancy of coking chemical waste water significantly reduces, and illustrates that most of organism in waste water is degraded or mineralising is subdued.
The present invention, on the basis of mixed heavy pond, fluid bed three-dimensional electrode reactor, can first make the degradation effect of COD in waste water be greater than 40%, and biodegradability significantly improves simultaneously, is conducive to the operation of MBR membrane bioreactor.By the further processing of follow-up MBR membrane bioreactor, ultraviolet sterilization device and reverse osmosis unit, in waste water, COD clearance will be greater than 70%, and gained produces the COD of water, the requirement that specific conductivity all can meet industrial circulating cooling water.Meanwhile, in the present invention, fluid bed three-dimensional electrode reactor just improves the biodegradability of coking chemical waste water, is not that the organism in coking chemical waste water is carried out to thorough mineralising, and therefore, cost for wastewater treatment is significantly reduced.
Claims (6)
1. a sterilizing type advanced treatment process of coking waste water, is the process to processing again through conventional Two-Stage Biochemical coking chemical waste water after treatment, and this technique comprises the steps:
1) by being delivered to through the coking chemical waste water of Two-Stage Biochemical processing in mixed heavy pond, make it under the effect of flocculation agent and coagulant aids, carry out precipitation process, obtain the waste water after precipitation;
2) waste water after precipitation is delivered in more medium filter and carries out filtration treatment, further to reduce mud, the concentration of suspension in waste water, obtain filtering rear waste water;
3) waste water after filtration is delivered in fluid bed three-dimensional electrode reactor and carries out electrocatalysis oxidation reaction, impel the organic substance of bio-refractory in waste water be oxidized by hydroxyl radical free radical and larger molecular organics and arene compound are degraded into small molecules or CO
2, the waste water after being oxidized;
4) waste water after oxidation is delivered in MBR membrane bioreactor and carries out continuous aeration processing, so that the further biochemical degradation of small molecules wherein is also held back part mud, suspended substance simultaneously;
5) will be through continuous aeration waste water after treatment directly as defoamer water, coal yard dust suppression water, reclaimed water in biological process;
6) will be delivered to further filtration treatment in cartridge filter through continuous aeration waste water after treatment, with wherein active sludge and the suspended substance of the overwhelming majority of filtering;
7) waste water after security personnel filter is delivered in ultraviolet sterilization device and carries out sterilization, to remove microorganism, the bacterium in waste water;
8) waste water after sterilization is delivered in reverse osmosis unit and carries out desalination processing, gained desalination waste water recycling is made technique recirculated cooling water, and reverse osmosis dense water is out as the cooling flushing cinder water of blast-furnace slag, coal yard dust suppression water, road-cleaning water;
In described step 1), flocculation agent adopts polymeric ferrous sulphate solution and/or polymeric aluminum chlorides solution, and the concentration after its interpolation in waste water is 200～800mg/L, and coagulant aids adopts polyacrylamide, and the concentration after its interpolation in waste water is 0.5～10mg/L;
Described step 2) in, the filtrate in more medium filter adopts hard coal, the haydite of 3～6mm and three layers of combination of the quartz sand of 4～10mm that particle diameter is 0.5～2mm;
In described step 3), the granule electrode of fluid bed three-dimensional electrode reactor adopts the coke granule of metallizing compound, and its current density is 20～100mA/cm
2, the waste water residence time is therein 30～60min;
In described step 4), the aeration intensity in MBR membrane bioreactor is controlled at 0.15～0.5m
3/ h, dissolved oxygen concentration are that 1.5～8mg/L, film cleaning interval are 10～15d.
2. one kind for realizing the sterilizing type coking wastewater deep treatment equipment that technique designs described in claim 1, comprise mixed heavy pond (1), more medium filter (2), fluid bed three-dimensional electrode reactor (3), MBR membrane bioreactor (4), cartridge filter (5), ultraviolet sterilization device (6) and reverse osmosis unit (13), it is characterized in that: the coking chemical waste water outlet in described mixed heavy pond (1) is connected with the import of more medium filter (2), the outlet of described more medium filter (2) is connected with the waste water input terminus of fluid bed three-dimensional electrode reactor (3), the air input terminus of described fluid bed three-dimensional electrode reactor (3) is connected with gas blower (7), the waste water output terminal of described fluid bed three-dimensional electrode reactor (3) is connected with the water-in of MBR membrane bioreactor (4), the aeration opening of described MBR membrane bioreactor (4) is connected with aeration pump (8), the water outlet of described MBR membrane bioreactor (4) is connected with the import of cartridge filter (5) by suction pump (9), the outlet of described cartridge filter (5) is connected with the input aperture of ultraviolet sterilization device (6), the delivery port of described ultraviolet sterilization device (6) is connected with the former water input terminus of reverse osmosis unit (13).
3. sterilizing type coking wastewater deep treatment equipment according to claim 2, it is characterized in that: described fluid bed three-dimensional electrode reactor (3) comprises cell body (302), in described cell body (302), be provided with sealing support frame (307), described sealing support frame (307) middle part is provided with air distribution plate (308), in the cell body (302) of described air distribution plate (308) below, be provided with aerator (309), the air input terminus of described aerator (309) is connected with gas blower (7); In the cell body (302) of described aerator (309) below, be provided with water distributor (301), the waste water input terminus of described water distributor (301) is connected with the outlet of more medium filter (2); Described sealing support frame (307) top is provided with negative electrode (304) and positive electrode (305), in described negative electrode (304) and positive electrode (305) cell body (302) around, be scattered with fluidised granule electrode (303), the top waste water output terminal of described cell body (302) is provided with the hole plate (306) for preventing that granule electrode (303) from escaping, and described hole plate (306) communicates with the water-in of MBR membrane bioreactor (4).
4. sterilizing type coking wastewater deep treatment equipment according to claim 3, is characterized in that: described air distribution plate (308) is 5～25mm with the spacing of aerator (309), and the qi-emitting hole diameter on described air distribution plate (308) is 1～2mm; Ventilating pit diameter on described aerator (309) is 2～5mm; Posticum diameter on described water distributor (301) is 2～5mm.
5. according to the sterilizing type coking wastewater deep treatment equipment described in claim 3 or 4, it is characterized in that: described negative electrode (304) and positive electrode (305) are tabular or cylinder-like structure, or the reticulated structure corresponding with above-mentioned shape; Described granule electrode (303) adopts the coke granule that is coated with metallic compound that particle diameter is 2～10mm.
6. according to the sterilizing type coking wastewater deep treatment equipment described in claim 2 or 3 or 4, it is characterized in that: described MBR membrane bioreactor (4) comprises reaction tank body (401), the water-in of described reaction tank body (401) is connected with the waste water output terminal of fluid bed three-dimensional electrode reactor (3), in described reaction tank body (401), be set side by side with immersion MBR membrane module (402), the aeration opening of described immersion MBR membrane module (402) is connected with aeration pump (8), the water outlet of described MBR membrane module (402) is connected with suction pump (9), the sewage draining exit of described reaction tank body (401) is connected with residual sea water pump (403).
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| CN101723548A (en) * | 2009-12-10 | 2010-06-09 | 上海宝钢化工有限公司 | System for recycling and treating coking wastewater |
| CN101812702A (en) * | 2010-05-11 | 2010-08-25 | 中国环境科学研究院 | three-phase three-dimensional electrochemical reactor |
| CN102115287A (en) * | 2011-01-13 | 2011-07-06 | 北京首钢国际工程技术有限公司 | Coking waste water deep treatment zero-emission process |
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