CN1562815A - Reverse osmosis method for treating sewage - Google Patents
Reverse osmosis method for treating sewage Download PDFInfo
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- CN1562815A CN1562815A CN 200410012228 CN200410012228A CN1562815A CN 1562815 A CN1562815 A CN 1562815A CN 200410012228 CN200410012228 CN 200410012228 CN 200410012228 A CN200410012228 A CN 200410012228A CN 1562815 A CN1562815 A CN 1562815A
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Abstract
By the method, muddy circular water is preprocessed to adjust its pH value to 7-7.5, and is send into aeration tank to get rid of ironion, then is send into mechanical reaction tank to uniform mix flocculator and coagulant aids, it is became preprocessed water after getting rid of partial suspended substances by cantboard precipitation tank. One part of preprocessed water is send into blending water tank after getting rid of impurity by filter, the other part is send into ozone reaction tank to get rid of larger impurity in water by mutiple medium filter after disinfection, then it is send into microfilter to entrapment particle (diam more than 20 um), and is send into safety filter to entrapment particle (diam more than 5 um) and primary get rid of salt by first stage reverse osmosis treatment, one part is send output, one part is send to blending water tank to be blended to clean circular water, the other part is processed by secondary reverse osmosis treatment and mixed bed treatment.
Description
Technical field
The present invention relates to a kind of reverse osmosis treatent method of water.
Background technology
Iron And Steel Company produces several ten million tons sewage every year in surface cleaning, circulation cooling production process, the PH instability of sewage, suspension object height, colourity are big, oil, iron, inorganic salt content height, bigger than general sewage disposal difficulty, cl content height particularly, emphasis is salt and a chlorion in dewatering, and adopts the reverse osmosis sewage water treatment method.The reverse osmosis sewage water treatment method is compared with desalination separation methods such as electrodialysis, ion-exchanges, have do not undergo phase transition, need not heat, equipment is simple, efficient is high, take up an area of less, energy consumption advantage low, simple to operate, particularly handle the sewage of high salt concentration, the reverse osmosis sewage water treatment method is lower than other demineralising process power consumption.Therefore the reverse osmosis sewage water treatment method not only is widely used in seawater, brackish water desalination, and has been used for the concentrating of food, medicine, purification, water softening, water reuse and waste liquid and reclaims.But existing reverse osmosis treatent method generally is used for concentrating of the few water for the treatment of water foreign matter content such as seawater, medicine, can not be directly used in to handle the waste water that the high waste water of foreign matter content such as iron and steel enterprise produce.Present iron and steel enterprise particularly steelworks water consumption is very big, and the waste water of generation is also a lot, the service discharge deficiency, and handling waste water has become the important difficult problem that iron and steel enterprise reduced cost, enlarged production.
Summary of the invention
Can not handle the deficiency of the high waste water of foreign matter content that iron and steel enterprise produces in order to overcome existing reverse osmosis sewage water treatment method, the invention provides a kind of reverse osmosis sewage water treatment method, present method can be handled the waste water that iron and steel enterprise produces.
Technical scheme of the present invention is the various wastewater of iron and steel enterprise to be treated to turbid circulating water through one-level be discharged into the turbid circulating water water reservoir, the water of turbid circulating water water reservoir is carried out pre-treatment earlier, promptly add flocculation agent coagulant aids coagulation through aeration oxidation process iron ions, automatic reaction pond successively, inclined-plate clarifying basin is removed most suspended substances.With pretreated moisture is two portions, and a part flows into the suction well of integrated pumping station, through the impurity in the filter elimination water, delivers to and blends the pond; Another part flows into the ozone reaction pond that ozonizer is installed, with a small amount of organic pollutant in the ozone mixed oxidization water, filter through more medium filter, enter the above particle of 20 μ m in the micro-strainer trap water, and in security personnel's strainer trap water the particle more than the 5 μ m, guaranteed the water quality of reverse osmosis requirement, salt in the first-stage reverse osmosis unit tentatively dewaters, water quality further improves, be divided into two portions, part water enters to be blent the water that pond and strainer come out and is mixed into clean circulating water, this portion water is as cooling water, through two-pass reverse osmosis unit and mixed salt that further removes in anhydrating, water quality improves a step again to another part water again, and water quality reaches the requirement of medium temperature and medium pressure boiler feed water standard.Turbid circulating water becomes three kinds of water that water quality is different through above-mentioned processing, uses for the different equipment of iron and steel enterprise, and the waste water that produces with the back enters water reservoir again and handles once more after one-level is handled, recycle, and insufficient water is additional by underground water or Running-water Company.
Describe reverse osmosis sewage water treatment method of the present invention below in detail.
Is the sewage after handling through one-level that turbid circulating water is discharged into the turbid circulating water water reservoir, carry out pre-treatment, pretreated steps in sequence is, I is the turbid circulating water that is discharged in the turbid circulating water water reservoir, behind the big floating matter of the grid interception that is arranged on intake, measure the pH value of turbid circulating water, when pH value during in acidity, the flocculating effect of flocculation agent is poor, flume water-in before the aeration tank is by the automatic throwing device of installing of alkali lye, pH value according to turbid circulating water water reservoir drawing-off water adds alkali lye, or manually adds alkali lye, and the pH value of turbid circulating water is adjusted to 7-7.5; II sends into the aeration tank that the micro-pore aeration dish is installed to the turbid circulating water that regulates pH value, slow cross flow is moved in the aeration tank, stops 25-35 minute, adopts the aeration oxidation process iron ions, utilize airborne oxygen that oxidation of divalent iron ion is become ferric ion, combine with OH and form Fe (OH)
3Compound is removed through precipitation, to satisfy the requirement of reverse osmosis to iron ion content in the water inlet, and stop up swash plate even the pressure swash plate that collapses for fear of on the swash plate of inclined-plate clarifying basin, growing the bacterium algae, throw in clorox in the aeration tank, the add-on of clorox is determined according to the water inlet chlorine residue of postorder more medium filter, is guaranteed that chlorine residue is not more than 1mg/l; III promotes pump works to the water of aeration tank through one-level and delivers to the automatic reaction pond that stirrer is installed and is divided into the 2-4 lattice, input flocculant poly aluminum chloride and coagulant aids polyacrylamide stir coagulation in the automatic reaction pond, medicament and water are mixed, form alumen ustum, the input concentration of flocculant poly aluminum chloride and coagulant aids polyacrylamide is respectively 25-35mg/l and 0.16-0.22mg/l; The water in IV automatic reaction pond flows into the inclined-plate clarifying basin that mud rake and slag stock pump are installed certainly, the most suspended substances in inclined-plate clarifying basin removal water, and the inclined-plate clarifying basin middle part is recessed deeply, and periphery is shallow, at the inclined-plate clarifying basin inside circumference swash plate is installed.
Being two portions through above-mentioned pretreated moisture, a part of water flows into the suction well of integrated pumping station, and the impurity in the water water in the suction well is pumped in the strainer elimination water of filling hard coal and quartz sand is sent into and blent the pond; Another part water is sent into the ozone reaction pond, carries out following processing successively, and 1 mixes with ozone in the suction well in ozone reaction pond, the organism in the water is adopted ozone sterilization, sterilization, removes look, a small amount of organic pollutant in the oxidizing water; 2 water add flocculant poly aluminum chloride by fluid filling pump during through the duct coupling of ozonize Ying Chi and more medium filter, and adding concentration is 3mg/l; The water of drawing in the 3 ozone reaction ponds and be added with flocculant poly aluminum chloride is sent into quartz sand and anthracitic more medium filter is housed; For the water quality after guaranteeing to filter, more medium filter adopts air bump rinse operation and water backwash, and the water backwash cycle is 16-24 hour, and more medium filter water outlet comprehensive pollution prime number SDI value is below 5; The water that 4 more medium filters come out, below the turbidity 1NTU, but still have some subtitle substances, colloid, bacterium,, hold back more medium filter and filter the above particle of 20 μ m in the water of back so the water outlet of more medium filter utilizes overbottom pressure to flow into the micro-strainer that filter core is housed automatically; 5 water that come out from micro-strainer are to the pipeline security personnel's strainer, line mixer is installed, extracting reductive agent and Scale inhibitors respectively by the metering Teat pipette from batch meter is added to water is mixed with medicament in flow process, dropping into reductive agent is for oxidizing substance such as chlorine residue, ozone etc. in the reductive water, oxidizing substance can cause permanent damage to film, the concentration that reductive agent drops into is determined according to remaining chlorine in the water, the chlorine residue of general 1mg/l drops into the reductive agent of 3mg/l, and Scale inhibitors generally drops into 4--5mg/l; Security personnel's strainer of dress filter core in 6 water that are added with reductive agent and Scale inhibitors enter, by the particle more than the 5 μ m in security personnel's strainer trap water, further guarantee the water quality of reverse osmosis, micro-strainer mainly shields to reverse osmosis unit with security personnel's strainer, the water that comes out from the ozone reaction pond is through behind the three-stage filtration, and water quality meets the requirement of feed water by reverse osmosis fully; 7 in order to remove the salt in anhydrating, squeeze into the first-stage reverse osmosis unit of the pressurized vessel that the filtering membrane element is housed from the water that comes out of security personnel's strainer with high-pressure pump, carry out one-step desalting just, behind the first-stage reverse osmosis unit, the rate of recovery of water is more than 75%, and the desalination rate is more than 97%.The first water of one-step desalting, a part of water is used for the stainless steel mill, as the rolled stainless steel cooling water, after a part is sent into and is blent water that pond and strainer come out and blend, as clean circulating water, the cooling water of supply process furnace, generator.The strong brine of first-stage reverse osmosis unit flows into the turbid circulating water water reservoir certainly from trench.
In order to give the equipment water supply high to water quality requirement, the water of reason outside above-mentioned first-stage reverse osmosis must and mix bed further except that the salt in anhydrating by the two-pass reverse osmosis unit.Some enters the further desalination of two-pass reverse osmosis unit of the pressurized vessel that filtering membrane is housed the water that the first-stage reverse osmosis unit comes out, and the rate of recovery of water is more than 85%, and the desalination rate is more than 97%.The strong brine of two-pass reverse osmosis unit is got back to the turbid circulating water water reservoir.
The water that two-pass reverse osmosis comes out enters top dress resin anion(R.A), and the mixed bed of bottom dress resin cation (R.C.) is further removed remaining salt in the water through mixing bed.Use acid-alkali regeneration after moving a week.Water quality after the overmulling bed is handled reaches medium temperature and medium pressure boiler feed water standard, supplies with the medium pressure boiler water in power station.
Reverse osmosis sewage water treatment method of the present invention, existing sewage disposal device is reassembled into Sewage treatment systems, can handle the high waste water of foreign matter content that iron and steel enterprise produces, the effect of sewage disposal satisfy iron and steel enterprise each with water spot to requirements in water quality, the rate of recovery of water reaches 90%, can satisfy part water spot water consumption, as embodiment in the present specification, processing power reaches 3000 tons/hour, per hour can produce 1400 tons of de-mineralized waters, 700 tons of parts and the settling tank water outlet of these water are blent into the fine clean circulating water, per hour are 1800 tons; A part further is processed into the medium temperature and medium pressure boiler feed water, per hour is 300 tons.With this economic benefit of asking the embodiment in the file, further specify the advantage of this reverse osmosis sewage water treatment method.
1 through on probation, and the annual direct economic benefit that produces is: (1) 2003 year total 1,728 ten thousand tons of water yield of handling, reduce 4,520,000 tons of outer drainings, and useless 0.4 yuan of outer draining blowdown per ton is saved 180.8 ten thousand yuan altogether; Production one-level de-mineralized water was 345.6 ten thousand tons in (2) 2003 years, wherein supplied with seven and rolled 51.7 ten thousand tons of stainless steel systems, and 4.5 yuan of calculating of de-mineralized water per ton produce 232.65 ten thousand yuan of benefits; (3) 293.9 ten thousand tons of one-level de-mineralized waters are delivered to and are blent the pond, enter company's water system, reduce the water system saltiness, reduce company's system medicament and take and maintenance cost, and accumulative total produces 413.45 ten thousand yuan of economic benefits.
2 potential economic benefits: if six first-stage reverse osmosis units and two whole oeprations at full load of two-pass reverse osmosis unit, the annual economic benefit that produces is as follows: (1) produces 1,440 ten thousand tons of high-quality clean circulating waters, can replace water at low temperature, according to 2.9 yuan of calculating of water at low temperature per ton, can save 4,176 ten thousand yuan in 1 year; (2) produce 2,800,000 tons of de-mineralized waters,, can save 1,260 ten thousand yuan in 1 year according to 4.5 yuan of calculating of de-mineralized water per ton; (3) produce 2,400,000 tons of secondary de-mineralized waters, according to 5.0 yuan of calculating per ton, can save 1,200 ten thousand yuan in 1 year, accumulative total produces 6,636 ten thousand yuan of economic benefits.
Description of drawings
Fig. 1 is the schema of most preferred embodiment of the present invention.
Among the figure: 1, turbid circulating water water reservoir 2, add alkali lye 3, aeration tank 4, throw in clorox 5, automatic reaction pond 6, inclined-plate clarifying basin 7, integrated pumping station 8, strainer 9, blend pond 10, the user 11, ozone reaction pond 12, add flocculation agent 13, more medium filter 14, micro-strainer 15, add reductive agent Scale inhibitors 16, security personnel's strainer 17, first-stage reverse osmosis unit 18, two-pass reverse osmosis unit 19, mix bed 20, stainless steel system 21, the power station
Embodiment
Below by embodiment and description of drawings reverse osmosis sewage water treatment method of the present invention detailed process thereof, but this reverse osmosis sewage water treatment method is not limited to following embodiment.
The flow process of sewage water treatment method embodiment of the present invention is referring to Fig. 1.
Is the waste water after handling through one-level that turbid circulating water is discharged into turbid circulating water water reservoir 1, and the water quality of turbid circulating water sees Table 1.
Table 1
| Project | ?SS | ??Oil | ??Fe | ??PH | Saltiness | ??COD |
| Parameter | ?100-500 | ??20-40 | ??10-30 | ??2-11 | ?2000-3000 | ??38-240 |
The unit of SS, Oil, Fe, COD is mg/l, and the unit of saltiness is us/cm; At first measure the pH value of turbid circulating water, when pH value is acidity, the flocculating effect of flocculation agent is poor, one flume is arranged before aeration tank 3, water-in at flume is installed with the automatic throwing device of a cover alkali lye, pH value according to turbid circulating water water reservoir 1 drawing-off water adds alkali lye 2 automatically, and the pH value that added liquid caustic soda adjustment waste water before entering aeration tank 3 is alkalescence to 7-7.5.Also can manually add alkali lye according to pH value.Reverse osmosis has higher requirement to water quality, and the feed water by reverse osmosis water quality requirement sees Table 2
Table 2 feed water by reverse osmosis water quality requirement
| Project | Water temperature ℃ | PH value | Turbidity (NTU) | Colourity (doubly) | Pollution index (SDI) | Chlorine residue (mg/l) | COD (mg/l) | Iron (mg/l) |
| Index | 15-35 | 3-11 | ≤0.3 | Clearly | ≤5 | ≤0.01 | ≤2 | ≤0.1 |
Clearly, the water in the turbid circulating water water reservoir 1 can not directly be imported reverse osmosis unit, must be through handling.
The turbid circulating water that is discharged in the turbid circulating water water reservoir 1, behind the big floating matter of the grid interception that is arranged on intake, and the pH value of turbid circulating water is adjusted to below 7.5 with the automatic throwing device of alkali lye, send into aeration tank 3 with 3000 tons/hour flow per hour, the aeration tank is the cement pit of 22m * 15m, be divided into two lattice, 600 micro-pore aeration dishes are housed in the pond.Turbid circulating water is sluggish flow in aeration tank 3, stops 30 minutes, adopts the aeration oxidation process iron ions through 30 minutes in aeration tank 3, utilizes airborne oxygen that oxidation of divalent iron ion is become ferric ion, with OH
-In conjunction with forming Fe (OH)
3Compound is through precipitating, removing by filter, to satisfy the requirement of reverse osmosis to iron ion content in the water inlet.
Owing to contain organism in the water, come the water temp major part at 15-25 ℃, just be fit to the growth of bacterium algae, stop up swash plate even the pressure swash plate that collapses, input clorox 4 during entering inclined-plate clarifying basin 6 preceding aeration tanks 3 for fear of on the swash plate of inclined-plate clarifying basin 6, growing the bacterium algae.Clorox effect under acidic conditions is better, this contradicts with iron ions, in order to guarantee the PH of iron ions and coagulation, consider the acidic conditions of clorox again, PH is 7.5 better, the add-on of clorox is determined according to the water inlet chlorine residue of postorder more medium filter, guarantees to get final product about chlorine residue 1mg/l.
The water of aeration tank 3 is promoted pump works through one-level, promote 4 model 14sh-28 impeller pumps, impeller pump flow Q=1260m are installed in the pumping plant
3/ h, lift H=16.2m, the dosing coagulation is carried out in the automatic reaction pond 5 that rises to branch four row of 6m, throws in flocculant poly aluminum chloride and coagulant aids polyacrylamide in the automatic reaction pond 5, medicament and water are mixed, form alumen ustum, the long 13m in automatic reaction pond, wide 11m, depth of water 3.6m, the every row in automatic reaction pond are divided into three lattice from inlet water to outlet water again, stirrer in every lattice, totally 12.For the alumen ustum that prevents to form is smashed again, the rotating speed of three interior stirrers of lattice subtracts casual from the feed-water end to the water side successively.Three model JBS2000/I stirrers are installed in present embodiment first lattice, three JBS2000/II stirrers are installed in second lattice, three JBS2000/III stirrers are installed in the 3rd lattice, the rotating speed of stirrer is respectively 0.54m/s in three lattice, 0.35m/s, 0.15m/s.The input concentration of flocculant poly aluminum chloride and coagulant aids polyacrylamide is respectively 30mg/l and 0.2mg/l.
The water in four row automatic reaction ponds 5 is from flowing into two inclined-plate clarifying basins 6, and inclined-plate clarifying basin 6 is mainly used in the most suspended substances of removing in the water.Inclined-plate clarifying basin 6 is middle water inlet, the radical sedimentation basin of peripheral effluent, inclined-plate clarifying basin 6 middle parts are recessed deeply, periphery is shallow, the inclined-plate clarifying basin 6 middle part depth of water 5.7m of present embodiment, pool wall depth of water 4.25m, the diameter 29m of inclined-plate clarifying basin 6, available depth 4.25m, the total effective area of two inclined-plate clarifying basins 6 are 6000m
3, processing power reaches 3000 tons/hour, and the water yield requires and guarantee water quality in order to satisfy, and at inclined-plate clarifying basin 6 inside circumferences the swash plate of wide 3m is installed, and increases desilting area 245m
2, shorten sedimentation time, the reinforced deposition effect.Through above-mentioned pre-treatment, the water quality of coming out from inclined-plate clarifying basin 6 is significantly improved, and effluent quality sees Table 3
Table 3 inclined-plate clarifying basin effluent quality
| Project | Index |
| PH value | ????7--8 |
| Suspended substance (mg/l) | ????≤5 |
| Specific conductivity (μ s/cm) | ????≤2000 |
| Iron (mg/l) | ????≤0.5 |
| Oil (mg/l) | ????≤4 |
| ????COD(mg/l) | ????≤30 |
| Turbidity (NTU) | ????≤5 |
Each 6 end of inclined-plate clarifying basin, all be installed with a mud rake and two slag stock pumps, slag stock pump model 100D-L, flow Q=58m
3/ h, when lift H=20m, influent turbidity fluctuateed between 20-40NTU, delivery turbidity can be less than 5NTU.The model XL19A-SY type of mud rake, 4 kilowatts of power, major parts have the lifting gear of driving, torque, mud scraper, inlet channel, overflow weir, electric control gear, mud scraper rotating speed 0.031lr/min, mud scraper range 500mm, mud scraper rising or falling speed 40mm/min.
Inclined-plate clarifying basin 6 some water enter the suction well of integrated pumping station 7 with 1100 tons/hour flow, and integrated pumping station 7 has suction well, water pump, and suction well is long 13.3m, wide 6m, the water reservoir of dark 4.9m.Seven water pumps are arranged, the water pump of three model 250S39 wherein, every flow Q=485m
3/ h, lift H=39m sends the water in the suction well into strainer 8.The water pump of three model 250S39, every flow Q=485m
3/ h, lift H=39m, the water after strainer 8 filters flows automatically to blends pond 9.Blending pond 9 is long 12m, wide 10m, dark 5m reinforced concrete earth-dammed reservoir.Use for the user after being used for reverse osmosis water outlet and pre-treatment water outlet blent into clean circulating water.The water pump of two model 250S24, every flow Q=485m
3/ h, lift H=24m, the water backwash strainer in the pond 9 is blent in suction.Present embodiment has four model GSL--4 types, the strainer 8 of diameter 4m, and filling hard coal and quartz sand in the strainer 8, concrete particle diameter sees Table 4.
Filling hard coal and quartz sand filter media in table 4 strainer, concrete particle diameter, thickness:
| Title | Particle diameter (mm) | Thickness (mm) | Remarks |
| Cobble | ????25-38 | ????100 | Supporting layer |
| ????18-25 | ????100 | Supporting layer | |
| ????12-18 | ????100 | Supporting layer | |
| ????6-12 | ????100 | Supporting layer | |
| Quartz sand | ????2-3 | ????300 | Filtrate |
| ????3-4 | ????300 | Filtrate | |
| Hard coal | ????3.5-5.5 | ????500 | Filtrate |
| ????5.5-7.5 | ????1000 | Filtrate |
The water quality that the process filter is crossed after 8 filters sees Table 5
Table 5 strainer effluent quality
| Project | Index |
| PH value | ????7--8 |
| Specific conductivity (μ s/cm) | ????≤2000 |
| Total iron (mg/l) | ????≤0.3 |
| Total manganese (mg/l) | ????≤0.1 |
| ????SDI | ????≤5 |
| Oil (mg/l) | ????≤1.0 |
| Total plate count (individual/ml) | ????≤100 |
| Turbidity (NTU) | ????≤1 |
| Oxidizing substance (mg/l) | ????0 |
Another part of inclined-plate clarifying basin 6 mixes with ozone with 1900 tons/hour flow deadweight inflow ozone reaction pond 11, ozone reaction pond 11 is long 5m, wide 10m, the water reservoir of dark 4.9m, the ozonizer of three LF-1000 types is being set in ozone reaction pond 11, the intake pressure 0.1-0.3Mpa of ozonizer, ozone output pressure 0.05-0.2Mpa, ozone dosage 1.5mg/l, ozone combines the suction well that the back gravity flow enters the two-stage hoisting pumping plant with water, thorough mixing reaction in suction well is owing to come to contain in the water organism, colourity, so adopt ozone to carry out sterilization, sterilization, remove look, a small amount of organic pollutant in the oxidizing water.Suction well is long 22m, and wide 10m installs four model 14sh-28 impeller pumps, every impeller pump flow Q=1260m in the water reservoir of dark 4.9m, two-stage hoisting pumping plant
3/ h, lift H=16.2m, secondary pump station are the pump stations between ozone reaction pond 11 and more medium filter 13.
By the two-stage hoisting pumping plant water in the suction well is sent into more medium filter 13 through pipeline, added flocculation agent 12 before entering more medium filter 13, by fluid filling pump flocculant poly aluminum chloride is added in this pipeline, adding concentration is 3mg/l.
More medium filter 13 has many, and present embodiment has 18, more medium filter 13 inner lining glass fiber reinforced plastics, and the designing treatment amount of every more medium filter 13 is 110-120m
3/ h, flow velocity are 5m/s, every more medium filter diameter Ф 5000mm, volume of equipment 77.8m
3, filtrate is quartz sand and hard coal, and the height of filtering layer is 400mm for the 1200mm supporting layer, and particle diameter and thickness relationship see Table 6,
Filling hard coal and quartz sand filter media in table 6 more medium filter, concrete particle diameter, thickness:
| Title | Particle diameter (mm) | Thickness (mm) | Remarks |
| Cobble | ????8-10 | ????100 | Supporting layer |
| Quartz sand | ????4-8 | ????100 | Supporting layer |
| Quartz sand | ????3-5 | ????100 | Supporting layer |
| Quartz sand | ????1-3 | ????100 | Supporting layer |
| Quartz sand | ????0.3-0.5 | ????800 | Filtrate |
| Hard coal | ????0.5-0.8 | ????400 | Filtrate |
For the water quality after guaranteeing to filter, more medium filter 13 adopts air bump rinse operation and water backwashes, and the water backwash cycle is 16-24 hour, and more medium filter water outlet comprehensive pollution prime number SDI value is below 5.
The water that more medium filter 13 comes out, below the turbidity 1NTU, but still have some subtitle substances, colloid, bacterium, more medium filter 13 water outlets utilize overbottom pressure to flow into micro-strainer 14 automatically to carry out micro-filtration, hold back more medium filter 13 and filter the above particle of 20 μ m in the water of back.The diameter 1000mm of micro-strainer 14, in adorn the collapsible fan-shaped filter core of 101 20 μ m, every filter core design water amount is 2m
3/ h.
The water that comes out from micro-strainer 14 adds reductive agent Scale inhibitors 15 through line mixer, and dropping into the reductive agent sodium bisulfite is for oxidizing substance in the reductive water.Adding Scale inhibitors is in order to protect the membrane element of reverse osmosis unit.The concentration that reductive agent drops into determines that according to the chlorine of surplus in the water chlorine residue of general 1mg/l drops into the reductive agent of 3mg/l, and Scale inhibitors generally drops into 5mg/l.Two of model DJ-200 batch meters, a dress reductive agent, a dress Scale inhibitors, add the model C 72 of measuring Teat pipette, flow Q=48L/h, lift H=16.2bar, two are used to add reductive agent, and two are used to add Scale inhibitors, and dosing pump is drawn soup and is added to line mixer again from batch meter.The Scale inhibitors of present embodiment is the MDC-220 Scale inhibitors of U.S. Bei Di company.
The water that is added with reductive agent and Scale inhibitors enters security personnel's strainer 16, with the above particle of 5 μ m in security personnel's strainer 16 trap water, further guarantees the water quality of reverse osmosis, and micro-strainer 14 mainly shields to reverse osmosis unit with security personnel's strainer 16.Security personnel's strainer diameter is 1000mm, in adorn 101 5 μ m felt formulas and twine filter cores, every filter core design water amount 2m
3/ h.The water that comes out from ozone reaction pond 11 is through behind the three-stage filtration, and water quality meets the requirement of feed water by reverse osmosis fully, and the water quality after security personnel's strainer 16 filters sees Table 7.
Table 7 security personnel strainer effluent quality
| Project | Index |
| PH value | ????7--8 |
| Specific conductivity (μ s/cm) | ????≤2000 |
| Total iron (mg/l) | ????≤0.3 |
| Total manganese (mg/l) | ????≤0.1 |
| ????SDI | ????≤5 |
| Oil (mg/l) | ????≤1.0 |
| Total plate count (individual/ml) | ????≤100 |
| Turbidity (NTU) | ????≤1 |
| Oxidizing substance (mg/l) | ????0 |
In order to remove the salt in anhydrating, squeeze into first-stage reverse osmosis unit 17 from the water that security personnel's strainer 16 comes out with high-pressure pump, carry out one-step desalting just, high-pressure pump has 6, model PWT125-100-315D, flow Q=648m
3/ h, lift H=43m.First-stage reverse osmosis unit 17 has 6 covers, and a high-pressure pump is that a cover reverse osmosis unit supplies water.Wherein 4 covers adopt the DOW BW30-365FR of company membrane element, and every cover reverse osmosis unit is made up of 48 pressurized vessels, is divided into two sections, first section 32, second section 16, adorns 7 membrane elements in every pressurized vessel, totally 1344 membrane elements.Two covers adopt KOCH company's T FC8832FR-575MAG membrane element in addition, and every cover reverse osmosis unit is made up of 54 pressurized vessels, is divided into two sections, and first section 36, second section 18.Adorn 4 membrane elements in every pressurized vessel, have 432 membrane elements.The reverse osmosis system rate of recovery of design is more than 75%, and the desalination rate is more than 97%.The water quality of coming out through the first-stage reverse osmosis unit sees Table 9.
Some gives the water that first-stage reverse osmosis comes out with 700 tons/hour flow and blends pond 9, after blending with 1100 tons/hour water of strainer 8, as clean circulating water, supplies with the cooling water of process furnace, generator.The water quality of blending the clean circulating water in the pond 9 sees Table 8.
The water quality of table 8 clean circulating water
| Project | Index |
| PH value | ????7--8 |
| Specific conductivity (μ s/cm) | ????≤300 |
| Total iron (mg/l) | ????≤0.3 |
| Total manganese (mg/l) | ????≤0.1 |
| Oil (mg/l) | ????≤2.0 |
| Total plate count (individual/ml) | ????≤300 |
| Turbidity (NTU) | ????≤5 |
The strong brine of first-stage reverse osmosis unit 17 is got back to turbid circulating water water reservoir 1, and some delivers to the mill of stainless steel system 20 with 350 tons/hour flow, as the rolled stainless steel cooling water.
Some water of the water that first-stage reverse osmosis unit 17 comes out enters the 18 further desalinations of two-pass reverse osmosis unit with 350 tons/hour flow, and two-pass reverse osmosis unit 18 has two high-pressure pump, model PWT125-100-315D, flow Q=648m
3/ h, lift H=43m.Two-pass reverse osmosis unit 18 has two covers, adopts the HYDRANAAUTICS ESPA4 of company membrane element, and every cover reverse osmosis is made up of 15 pressurized vessels, be divided into two sections, first section 10, second section 5, adorn 6 membrane elements in every pressurized vessel, totally 180 membrane elements, every cover unit design water outlet 150m
3/ h, the rate of recovery is more than 85%, and the desalination rate is more than 97%.Water quality after 18 desalinations of two-pass reverse osmosis unit sees Table 9.
Water quality behind table 9 one-level, the two-pass reverse osmosis unit
| Project | First-stage reverse osmosis | Two-pass reverse osmosis |
| PH value | ????6--7 | ????6--7 |
| Turbidity (NTU) | ????≤0.5 | ????≤0.5 |
| System's ratio of desalinization | ????≥97％ | ????≥97％ |
| The water rate of recovery | ????≥75％ | ????≥85％ |
| Total iron (mg/l) | ????≤0.1 | ????≤0.1 |
| Total manganese (mg/l) | ????≤0.05 | ????≤0.05 |
| Oil (mg/l) | ????≤0.5 | ????≤0.5 |
| Total plate count (individual/ml) | ????0 | ????≤10 |
The strong brine of two-pass reverse osmosis unit 18 is got back to turbid circulating water water reservoir 1, enters aeration tank 3 again.
The water that two-pass reverse osmosis comes out enters the mixed bed 19 of three paired runnings, and mixing bed 19 is water tanks of diameter 3m, mixes bed 19 and can further remove remaining salt in the water.Mix a dress resin anion(R.A) and resin cation (R.C.)s in the bed 19, top dress resin anion(R.A), bottom dress resin cation (R.C.), each adorns the 500mm height, uses acid-alkali regeneration after moving a week.Water quality after overmulling bed 19 is handled is very high, can satisfy the boiler feed water requirement in power station 21, supplies with the medium pressure boiler in power station, and its water quality sees Table 10.
Table 10 mixes an effluent quality
| Project | Index |
| Hardness (μ mol/L) | ????≤2.0 |
| Iron (μ g/l) | ????≤50 |
| Copper (μ g/l) | ????≤10 |
| Oil (mg/l) | ????≤1.0 |
Claims (3)
1, a kind of reverse osmosis sewage water treatment method, this method are that the turbid circulating water after handling through one-level is discharged into the turbid circulating water water reservoir, carry out pre-treatment, and pretreated steps in sequence is:
I measures the pH value of turbid circulating water, adds alkali lye according to the pH value of turbid circulating water water reservoir drawing-off water, and the pH value of turbid circulating water is adjusted to 7-7.5;
II sends into the aeration tank that the micro-pore aeration dish is installed to the turbid circulating water that regulates pH value, slow cross flow is moved in the aeration tank, stops 25-35 minute, adopts the aeration oxidation process iron ions, to satisfy the requirement of reverse osmosis, throw in clorox in the aeration tank to iron ion content in the water inlet;
III delivers to the automatic reaction pond that stirrer is installed to the water of aeration tank through promoting water pump, and input flocculant poly aluminum chloride and coagulant aids polyacrylamide stir coagulation in the automatic reaction pond, and medicament and water are mixed, and form alumen ustum;
The water in IV automatic reaction pond is from flowing into the inclined-plate clarifying basin that mud rake and slag stock pump are installed, the most suspended substances in inclined-plate clarifying basin removal water;
Being two portions through above-mentioned pretreated moisture, the impurity in a part of water is delivered in the strainer elimination water of filling hard coal and quartz sand is sent into and is blent the pond; Another part water is sent into the ozone reaction pond, carries out following processing successively;
A mixes with ozone in the ozone reaction pond, the organism in the water is adopted ozone sterilization, sterilization, removes look, a small amount of organic pollutant in the oxidizing water; B water adds flocculant poly aluminum chloride by fluid filling pump during through the duct coupling of ozonize Ying Chi and more medium filter; The water of drawing in the c ozone reaction pond and be added with flocculant poly aluminum chloride is sent into quartz sand and anthracitic more medium filter is housed, and more medium filter water outlet comprehensive pollution prime number SDI value is below 5; The water outlet of d more medium filter utilizes overbottom pressure to flow into the micro-strainer that filter core is housed automatically, holds back more medium filter and filters the above particle of 20 μ m in the water of back; The water that e comes out from micro-strainer is to the pipeline security personnel's strainer, line mixer is installed, extracting reductive agent and Scale inhibitors respectively by the metering Teat pipette from batch meter is added to water is mixed with medicament in flow process, oxidizing substance in the reductive water; The water that f is added with reductive agent and Scale inhibitors enters interior security personnel's strainer of adorning filter core, by the particle more than the 5 μ m in security personnel's strainer trap water, makes water quality meet the requirement of feed water by reverse osmosis; The water that g comes out from security personnel's strainer is squeezed into the first-stage reverse osmosis unit of the pressurized vessel that the filtering membrane element is housed with high-pressure pump, carry out one-step desalting just, the water of first one-step desalting, a part of water is directly exported, after a part is sent into and is blent water that pond and strainer come out and blend, as clean circulating water.
2, reverse osmosis sewage water treatment method according to claim 1, it is characterized in that: the water of reason outside first-stage reverse osmosis, some two-pass reverse osmosis that enters the pressurized vessel that filtering membrane is housed is handled, the water that two-pass reverse osmosis comes out enters top dress resin anion(R.A), the mixed bed of bottom dress resin cation (R.C.) is further removed remaining salt in the water through mixing bed.
3, according to claim 1,2 described reverse osmosis sewage water treatment methods, it is characterized in that: the add-on of clorox is determined according to the water inlet chlorine residue of more medium filter in the aeration tank, guarantees that chlorine residue is not more than 1mg/l; The input concentration of throwing in flocculant poly aluminum chloride and coagulant aids polyacrylamide in the automatic reaction pond is respectively 25-35mg/l and 0.16-0.22mg/l; The concentration that adds that adds flocculant poly aluminum chloride at the duct coupling of ozonize Ying Chi and more medium filter is 3mg/l.
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