CN1854093A - Oily sewage treatment and treater thereof - Google Patents
Oily sewage treatment and treater thereof Download PDFInfo
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- CN1854093A CN1854093A CN 200510066275 CN200510066275A CN1854093A CN 1854093 A CN1854093 A CN 1854093A CN 200510066275 CN200510066275 CN 200510066275 CN 200510066275 A CN200510066275 A CN 200510066275A CN 1854093 A CN1854093 A CN 1854093A
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Abstract
An oiling-bearing sewage treatment and treater are disclosed. The process is carried out by air floating dissolved air, drastically purifying by ultra-filtration membrane treating system and reverse osmose treating system, adding flocculant into sewage, entering it into air floating pool from top, entering micro-bubble into air floating pool from bottom and forming into counter-flow contact.
Description
Technical field
The present invention relates to water treatment field, relate in particular to and adopt the advanced treatment process of air supporting binding film technology, the invention still further relates to efficient dissolved air flotation device and the integrated sewage disposal device of film of realizing this technology oily(waste)water.
Background technology
The pollution that the fast development of industry is subjected to water surrounding is serious further, at present the whole nation has the life of 1/3 oily(waste)water, trade effluent and 4/5 just directly to be discharged with waste water is unprocessed approximately according to statistics, has also caused the severe contamination to resource when having aggravated water demand.The improvement of wastewater treatment, especially industrial sewage has become one of important step in the various industrial goods productions.Industries such as for example papermaking, weaving, iron and steel, thermoelectricity except chemical process, generally also comprise methods such as flocculating settling, air supporting, ultrafiltration and reverse osmosis to the treatment technology of sewage effluent.According to the characteristic of sewage effluent, these methods can be used alone or applied in any combination.
When the suspension content in the sewage is higher, adopt earlier usually sewage is implemented breakdown of emulsion, flocculating settling or air supporting pre-treatment, and then realize deep purifying by suitable processing, for example ultrafiltration and reverse osmosis system are implemented deep purifying.
The air supporting method is a kind of technology of solid-liquid or liquid-liquid separation, pneumatically supported principle is: produce a large amount of particulate small bubbles by ad hoc fashion, the particulate small bubbles that utilize these high dispersing are as carrier, go to adhere in the black water pollutent (for example, density approaches the solid or the liquid impurity particulate of water in the water), become air float body particle, make its density float to the water surface on less than water and form scum silica frost and be removed with certain speed.The dissolved air flotation technology is a kind of comparatively unique water technology, to be similar to the pollutents such as oils, fiber, suspensoid, algae, active sludge or microbial film of water very effective for separating proportion, is a kind ofly to contain in higher concentration suspended particle sewage and the oily(waste)water industry effectively sewage treatment process in generation so the air supporting method generally acknowledges.
Ultrafiltration and reverse osmosis technology have had a lot of reports in that the Application of Sewage effect is in the field of business, that is, through the water that air supporting is handled, can be by further handling, for example ultra-filtration technique or other advanced purification process become high-quality water.But for the higher oily(waste)water of oleaginousness, in order to improve the oil removal by air bubbling rate, one of modal method is to improve the addition of flocculation agent in the air supporting processing, the problem of thereupon bringing is that the residual quantity of producing flocculation agent in the water increases, if it is unfavorable to handle, very easily stop up fenestra after entering the film system, if adopt film to handle, also need processes such as the relatively harsh flocculating settling of condition, adsorption treatment, it is residual and contain the residual of oil contaminants and just can advance ultrafiltration membrane system further to reduce in the water flocculation agent.Because like this, no matter from the cost consideration of the cost and the film device for the treatment of processes, at present at the processing of oily(waste)water generally do not adopt air supporting directly with the combining of membrane technique.
For example disclose a kind of in the Chinese invention patent application 01119854.0 to containing the improvement technology of high-concentration gasoline, the sewage disposal of diesel oil ballasting, oil carrier oil-containing ballast water is entered water collecting basin, carry out barrier, remove and sink, remove silt and particulate matter, then through the aeration oil removal, remove oil slick through membrane filtration again, obtain as clear as crystal water outlet more after filtration, oil-containing≤5mg/L wherein." Jiangsu environmental science and technology ", NO.9,1999, a kind of air-floating apparatus (Geng Shangsuo) that is used for oily water treatment is disclosed, adopt heating oil removal and two-stage air supporting tandem process, the product water oil-containing after the processing is 4.1-9.6mg/L.Put down in writing a kind of oil field wastewater treatment method in the Chinese patent application 02149167.4, the water outlet oil removal rate after employing air supporting is handled is at 75-80%.
In various air flotation technologies, adopting many at present is the pressurized dissolved air flotation method, and be characterized in: the air dissolves degree in (1) water is big, and enough microbubbles can be provided, and can satisfy the different solid, liquid that require and separate, and guarantees removal effect; (2) discharge through decompression that bubble diameter little (10-150 μ m), particle diameter that the back produces are even, microbubble lift velocity in air flotation pool is very slow, and is less to pond water disturbance, be specially adapted to loose, the tiny solids constituent of flco from.Generally be that pressure air-dissolving water is depressurized the microbubble that produced from pressurized state when entering air flotation pool and carries out flowing of equidirectional with the former water of mobile from the air flotation pool bottom and upwards in actually operating, suspended substance contacts in the same way with bubble and rises jointly when adhering, become float on the particle that certain speed is arranged the surface blow off by slag scraper, this mode is common downflow system air supporting.But in actually operating, find, to former hydromining with this downflow system air-float technology, oil in the water outlet, fiber etc. are still very high, analyzing reason mainly is that bubble and suspended substance are shorter duration of contact in the following current process, the effect that the bubble suspended substance adheres to is relatively poor, and a part can not can be produced precipitation by the suspended substance that bubble adheres to, and perhaps is trapped in the water, perhaps, all reduced the water outlet quality along with water outlet is flowed out.
The deficiency of above-mentioned air supporting treating water technology is also relevant with the air-floating apparatus that is adopted, promptly, the dissolved air flotation device that uses generally all is that former water inlet and dissolved air water inlet are set in the air flotation pool bottom at present, dissolved air water is usually from gas-liquid mixing pump or the gas-liquid separation pump mixed dissolution to empty G﹠W, in air flotation pool, the pressure air-dissolving water that enters air flotation pool from dissolved air water inlet is depressurized and produces microbubble from pressurized state, this microbubble flows with the upwards former water following current of mobile that enters from former water (sewage) inlet, the suspended substance that rises in this former water contacts in the same way with the bubble of rising, make the adhesion of bubble and suspended substance, become the particle that certain speed is arranged, on float to surface back and blow off by slag scraper, thereby finish removing to suspended substance in the former water.To be that oil removal rate is the highest can only reach about 80% the result of practical application.Mention as the front, also need further processing just can offer advanced purification process, present way also has at the lower defective of one-level oil removal by air bubbling rate and adopts multistage air supporting, brings the Processes and apparatus complicated problems equally.
Therefore, characteristic according to treatment sewage, and the application requiring of water is produced in the processing back, select and definite a kind of effective treatment craft more, make a large amount of oily(waste)waters be treated as recycling middle water or high-quality clear water by high-level efficiency, low-cost industrialization, especially air flotation technology is directly combined the effective processing that realizes oily(waste)water with membrane technique, have extraordinary application prospect and practical significance.
Summary of the invention
The state of the art based on present sewage disposal, main purpose of the present invention is to provide a kind of treatment process at oily(waste)water, especially by improvement to the air supporting treatment process, the product water oil removal rate of handling through air supporting is significantly improved, can directly carry out ultrafiltration and reverse-osmosis treated and become high-quality clear water.
The present invention also provides a kind of water treating equipment that can be used for realizing above-mentioned technology, especially adopts the dissolved air flotation device of texture improvement and combining of ultrafiltration and reverse osmosis unit, has guaranteed that oily(waste)water obtains producing the high-quality of water after treatment.
According to sewage treatment process of the present invention, at first adopt dissolved air flotation process to dispose of sewage, the product water that obtains is handled through ultrafiltration membrane system and is obtained ultrafiltration water, and this ultrafiltration water also optionally adopts reverse osmosis treatment system to carry out deep purifying becomes high-quality water; Wherein, when adopting air supporting to handle, make the prior sewage that has added flocculation agent enter air flotation pool, and the microbubble of pressure air-dissolving water generates is to enter air flotation pool from the air flotation pool bottom, makes treatment sewage and dissolved air water form counter current contact in air flotation pool from the top of air flotation pool.
The contriver discovers by analysis, although air flotation technology has reasonable effect for the rough purification of oily(waste)water, but when oil length is higher in the sewage, after one-level air supporting, still leave some in the water outlet and contain oil contaminants, that is to say that the oily(waste)water oil removal rate that air supporting is handled generally reaches about 80%, its one of the main reasons is that sewage (former water) contacts with concurrent in air flotation pool with the microbubble that dissolved air water is produced, the oil suspensions that contains in bubble and the former water is lacked duration of contact, and the adhesion effect of suspended substance and bubble is undesirable.Therefore the present invention improves common process, oily(waste)water is entered from air flotation pool top, can contact with the reverse long period of bubble that the release of pressure dissolved air water produces when in air flotation pool, moving downward with certain speed, and the suspended substance that has adhered to bubble can upwards float with bubble, prolonged the duration of contact of suspended substance and bubble, naturally improve deposit efficiency, helped the clarification of water quality.
Contriver's research is also found, the generation of microbubble plays a key effect in air supporting is handled, perfect condition is in whole air supporting process, the microbubble that dissolved air water is released into the air flotation pool generation should be stabilized generation and become the small particle size bubble as far as possible, so preferable methods according to the present invention, after making water and air pressurized mixing forming dissolved air water in air-water mixing pump, this dissolved air water is sent into air flotation pool earlier again after knockout drum is regulated pressure, and control enters the microbubble particle diameter of air flotation pool at 20-60 μ m.According to method of the present invention, utilize the dissolved air water that air-water mixing pump produces again can be to the grain of microbubble through regulating through knockout drum, the microbubble that makes particle diameter concentrate on 20-60 μ m enters air flotation pool, microbubble greater than 60 μ m is then directly discharged, thereby improves the foaming efficient of dissolved air water and the absorption usefulness of microbubble.About the using and controlling all of gas-liquid mixing pump and knockout drum (also have and be called dissolving), can utilize knockout drum that dissolved air water pressure is adjusted to 0.2-1MPa and meet the demands according to routine operation.
The duration of contact in air flotation pool for prolongation suspended substance and bubble, except adopting the counter-current air floating processing, preferable methods of the present invention also comprises, make oily(waste)water and pressure air-dissolving water when entering air flotation pool, realize counter current contact again through the choked flow element that is provided with in the air flotation pool earlier respectively, like this, no matter be sewage or dissolved air water when entering air flotation pool owing to be subjected to carrying out rightabout flowing according to fixed flow process in the limited space of acting on of choked flow element, more help the prolongation of duration of contact.For example described choked flow element is the one or more spoiler that is provided with in the inboard staggered extension of air flotation pool, the inlet of oily(waste)water and pressure air-dissolving water lays respectively at a side that is provided with spoiler, that is, oily(waste)water and pressure air-dissolving water enter air flotation pool from a side that is provided with spoiler respectively.
According to preferred version of the present invention, in handling, air supporting adopts composite flocculation agent, the mass ratio of polymerize aluminum chloride and polyacrylamide is approximately 10 in this composite flocculation agent: 1-50: 1, determine that according to the characteristic of treatment sewage the addition of this composite flocculation agent is about 20-200ppm.
According to technology of the present invention, as long as satisfied above-mentioned requirements, concrete operations and process that air supporting is handled all are conventional for those skilled in the art, for example, from the oily(waste)water of raw water box (source of sewage) through with utilize intake pump from the input of air flotation pool top after an amount of flocculation agent mixes in transfer lime, sewage at first arrives the spoiler that is provided with on the inwall and changes the flow direction, walking around spoiler continues to flow downward, under the effect of flocculation agent, contain oil contaminants also by breakdown of emulsion and flocculation; Simultaneously, former water (can use the air supporting water outlet) becomes dissolved air water through air-water mixing pump effect and air mixed, the dissolving of flowing through earlier is adjusted pressure, enter air flotation pool by the dissolved air water transfer lime from the air flotation pool bottom, owing to decompression discharges a large amount of microbubbles (because the effect of dissolving enters the microbubble grain of air flotation pool through 20-60 μ m), same elder generation arrives the spoiler of inwall setting and changes the flow direction, walking around spoiler continues upwards to flow, sewage and microbubble are in contact with one another and make oil droplet and the suspended substance in the sewage to adhere to the back with the microbubble come-up with microbubble in flowing in opposite directions, and arrival air flotation pool baffle plate upper edge flows into sump by overflow weir; The water producing pipe of product water through the air flotation pool bottom after the processing is transported to the product water tank, and its oil removal rate can reach more than 95%.
The product water that obtains according to above-mentioned air supporting process enters ultrafiltration and reverse osmosis system through sterilization, sterilization to carry out deep purifying and becomes high-quality water.
The preferable methods according to the present invention is at the characteristics employing air-dissolving air-float technology of oily(waste)water and combining of ultra-filtration technique and reverse osmosis advanced purification techniques, that is:
After utilizing the greasy dirt and mechanical impurity in air flotation technology removal oily(waste)water or the trade effluent, carry out micro-filtration or uf processing again, impurity tunicles such as the macromole in the water, micelle body, protein, residual particles dam, the product water that comes out from the film the other end, suspended substance in the water is lower than 10mg/L, and total dissolved solidss＜1000mg/L does not have turbidity substantially, bacterium number＜100/mL, can be used as high-quality in water;
The water that comes out from micro-filtration or ultrafiltration membrane system, add chemical assistants such as quantitative Scale inhibitors, sterilant, after accurate filter is handled, enter reverse osmosis system and implement the deep purifying processing, ion range material that removal contains and low-molecular-weight organism, as inorganic salt, glucose, sucrose and toxic mineral matter, obtain high-quality water.
In membrane treatment process, during long-time operation, the impurity that contains in the water inlet can cause in various degree film and pollute, thereby reduces processing efficiency even damage film, carries out routine cleaning so above-mentioned technology also should comprise the film group device to ultrafiltration and reverse osmosis system.Cleaning can comprise water flushing, matting, and the pollution situation of looking film in the operation can adopt square impact or backwash, and perhaps square impact combines with backwash.No matter adopt what method, purpose all is to remove the dirt on film surface as far as possible.
Another aspect of the present invention provides a kind of oil conte, sewage treatment device (system) that is used to realize above-mentioned technology, it comprises the combination of pressurized dissolved air flotation device and ultrafiltration membrane treatment device, preferably also comprise combination with reverse osmosis purification device, wherein, the air flotation pool top of described pressurized dissolved air flotation device is provided with sewage inlet, the bottom is provided with the dissolved air water inlet, and described dissolved air water inlet is connected in the water source by a dissolved air water transfer lime, string is provided with air-water mixing pump on this dissolved air water transfer lime, is serially connected with knockout drum between described air-water mixing pump and the dissolved air water inlet.
Preferably, described air flotation pool is inboard and be provided with one or more choked flow element between sewage inlet and dissolved air water inlet, be used to hinder flowing of former water (sewage) and dissolved air water, thereby increase the duration of contact of the microbubble that former water and dissolved air water produce, raising separating effect.
More preferably, this choked flow element can be two or more than two spoiler, and it is arranged at the relative inner wall of air flotation pool respectively, and extends in opposite directions from this opposing sidewalls and to be staggered and to be provided with.
Reach as previously described, preferably, the sewage inlet of described air-floating apparatus is arranged at the air flotation pool top, and the dissolved air water import is arranged at the air flotation pool bottom.
Above-mentioned air-floating apparatus can be similar with common dissolved air flotation device, promptly is provided with the overflow weir that highly is lower than the air flotation pool height in the air flotation pool, and this air flotation pool is separated by overflow weir, becomes air-flotation reactor in overflow weir one side, and form a sump in the opposite side of overflow weir.Described sump bottom is provided with waste pipe, and this waste pipe is connected in sewage lagoon by sump pump, thereby can be discharged in the sewage lagoon by the sewage of sump pump with sump.Former water inlet can be connected in a Yuan Shui water source by former water inlet pipe, and string is provided with raw water pump on this former water inlet pipe, on the pipeline between described Yuan Shui water source and the raw water pump and be connected to the volume pump that is used to measure and drop into flocculation agent.
Described air-flotation reactor bottom also is provided with the product water out, and this product water out is connected in clean water basin by a water producing pipe, and string is provided with one and produces water pump on this water producing pipe, is used for the clear water that air-flotation reactor produces is drawn.
The dissolved air water inlet of air flotation pool is connected in the water source by a dissolved air water transfer lime, and string is provided with air-water mixing pump on this dissolved air water transfer lime, is serially connected with knockout drum between described air-water mixing pump and dissolved air water inlet.Like this, utilize the agitating function of air-water mixing pump and the pressure and the microbubble regulating effect of knockout drum, the air that will be difficult to be dissolved in the water mixes fully and dissolves, form the less microbubble of particle diameter, carry out force feed simultaneously, shortened stirring technique greatly, and can obviously increase dissolved air flotation speed and improve effluent quality; In addition, air-floating apparatus provided by the invention is simple in structure, the dissolved efficiency height, and than operation and the control easily of traditional device, and the obvious processing effect raising, the water after the processing can directly enter the film system.
In the specific embodiment, the inlet end of described air-water mixing pump can be connected in described water producing pipe, constitutes the described water source that forms dissolved air water by the water in this water producing pipe, forms the recycle to the water after the air-floating apparatus processing.
Assembly and device itself about ultrafiltration and reverse-osmosis treated, the present invention does not have particular requirement, after only needing product water process ozone oxidation device or other conventional sterilization device germicidal treatment with air-floating apparatus, be transported to the former pond of water reservoir or ultrafiltration and reverse osmosis unit, this former pond is by conveying, separation mechanism and membrane filter appts; Optionally, the product pond of ultrafiltration membrane filter device links to each other (wherein need add Scale inhibitors, sterilant etc.) with the former pond of reverse osmosis unit again, links to each other with reverse osmosis unit through filter, and the product water after the processing flows to clean water basin through hydraulic pipe.Ultrafiltration and reverse osmosis unit that the present invention is suitable for include wiper mechanism, and concrete adapter path and mode of connection all are techniques well known, do not do at this and give unnecessary details.
In a word, the present invention is characteristic at oily(waste)water to the contribution of prior art, improve the air supporting treatment technology, making the product water after air supporting is handled has been good primary water, oil removal rate can reach more than 95%, can directly enter the film system and carry out ultrafiltration or micro-filtration, and not influence the use properties of film, thereby realize that the air supporting processing combines afterwards high-level efficiency, handles oily(waste)water at low cost with membrane technique.So of the present invention being embodied as solves the oily(waste)water discharging and provides more effectively scheme to the pollution of environment.
Description of drawings
Fig. 1 is the schematic flow sheet of air-dissolving air-float operation of the present invention.
Fig. 2 is the idiographic flow synoptic diagram of ultrafiltration of the present invention.
Fig. 3 is the idiographic flow synoptic diagram of reverse osmosis operation of the present invention.
Fig. 4 is the structural representation of air flotation pool in the air-floating apparatus that adopts of specific embodiments of the present invention.
Embodiment
Describe the beneficial effect of enforcement of the present invention and generation in detail below in conjunction with specific embodiment, but do not constitute qualification embodiment of the present invention.
Embodiment 1
Sewage disposal flow process and device
1, the concrete example of air supporting processing
As shown in Figure 1 and Figure 4, the air-floating apparatus that the present invention uses, at least include air-flotation reactor 11 and the former water inlet 12 that is communicated in air-flotation reactor 11, dissolved air water inlet 13, described former water inlet 12 is arranged at the top of described air-flotation reactor 11, and dissolved air water inlet 13 is arranged at the bottom of described air-flotation reactor 11.Like this, in air-flotation reactor 11, the former water that enters from former water inlet 12 from up to down flows, and behind release of pressure, produce from bottom to top microbubble from dissolved air water inlet 13 dissolved air waters that enter, former water and microbubble are reverse to be contacted thereby make, and the collision that greasy dirt in microbubble and the former water or suspended substance can carry out repeatedly adheres to, and has effectively prolonged duration of contact, improved the dissolved air flotation effect, the water outlet oil removal rate that makes air-floating apparatus is up to more than 95%.
Concrete structure example as for air flotation pool 10, as shown in Figure 4, air-flotation reactor's 11 inwalls and between former water inlet 12 and dissolved air water inlet 13, be provided with one or more choked flow element 14 (in this example be two and extend the spoilers that are crisscross arranged mutually), former water inlet 12 is arranged at the top of air-flotation reactor 11, inlet is directly to upper strata spoiler 14, and dissolved air water inlet 13 is arranged at the bottom of air-flotation reactor 11, the inlet also from the bottom directly to lower floor's spoiler 14, earlier changed flow process when former like this water and dissolved air water are sent to reaction tank and meet by spoiler 14 choked flows, thereby prolong the countercurrent flow of former water and microbubble, increase their duration of contact, improve the dissolved air flotation effect.
Whole air-floating apparatus includes an air flotation pool 10, is provided with the overflow weir 15 that highly is lower than the air flotation pool height in it, and this air flotation pool 10 is separated by overflow weir 15, and a side forms described air-flotation reactor 11, and opposite side forms a sump 16.Like this, through the processing in the air-flotation reactor 11, the impurity in the former water with bubble through the water column after microbubble combines and form the sewage layer, after the sewage lamination was gathered to a certain degree, the overflow weir 15 that can overflow and highly be lower than air flotation pool 10 was pooled in the sump 16.
As shown in Figure 1, these sump 16 bottoms can be provided with waste pipe 20, and this waste pipe 20 is connected in sewage lagoon 22 by sump pump 21, thereby can the sewage in the sump 16 be discharged in the sewage lagoon 22 by sump pump 21.
As shown in Figure 1, former water inlet 11 can be connected in Yuan Shui water source 31 by former water inlet pipe 30, be provided with raw water pump 32 in this former water inlet pipe 30, on the pipeline between described Yuan Shui water source 31 and the raw water pump 32 and be connected to the volume pump 33 that is used to measure and drop into flocculation agent.In the present embodiment, this Yuan Shui water source 31 is a former pond.
As shown in Figure 1, air-flotation reactor 11 bottoms also are provided with produces water out 17, and this product water out 17 is connected in clean water basin 41 by water producing pipe 40, and string is provided with and produces water pump 42 on this water producing pipe 40, is used for the clear water that air-flotation reactor 11 produces is drawn out in the clean water basin 41.
As shown in Figure 1, dissolved air water inlet 13 is connected in the water source by a dissolved air water transfer lime 50, and string is provided with air-water mixing pump 51 on this dissolved air water transfer lime 50, and enters the mouth with dissolved air water in described air-water mixing pump 51 and to be serially connected with knockout drum 52 between 13.Like this, water in the water source mixes with air through air-water mixing pump 51, and can utilize the adjusting container effect of the agitating function and the knockout drum 52 of air-water mixing pump 51, the air that will be difficult to be dissolved in the water mixes fully and dissolves, and carries out force feed simultaneously, shortened stirring technique greatly, simple in structure, the dissolved efficiency height is than operation and the control easily of traditional device, can obviously increase dissolved air flotation speed and improve effluent quality, can be called efficient molten gas and increase the journey air-floating apparatus.
As shown in Figure 1, the inlet end of air-water mixing pump 51 can be connected in described water producing pipe 40, constitutes the described water source that forms dissolved air water by the water in this water producing pipe 40, forms the recycle to the clear water after the air-floating apparatus processing.
2, ultrafiltration flow process
Water outlet such as the further purifying treatment of need from the air supporting process, then the raw water box 60 of ultra-filtration equipment among Fig. 2 will be transported to behind the process ozone oxidation device of the product water in the above-mentioned clean water basin 41 or other conventional sterilization device, through working shaft 61 and strainer 62, enter the hyperfiltration membrane assembly 63 of membrane treatment appts, water outlet after film is handled flow to produce pond 65 (or other water-storing devices) become high-quality in water (except that necessary control valve is set, also vent valve can be set in the stream).
As shown in Figure 2, this ultra-filtration equipment also connects cleaning system, for example, water-in at hyperfiltration membrane assembly 63 has designed clean-out system water inlet pipe A in addition, link to each other with pharmaceutical chemicals cleaning case 66 by scavenging pump 661, add chemical in the cleaning case 66 in advance, when needing to clean, scavenging solution in the cleaning case enters hyperfiltration membrane assembly 63 to set dosage behind scavenging pump 661 and strainer 662, after scavenging solution carries out the cyclic chemical cleaning of setting-up time to film, scavenging solution is discharged (for example can discharge from water shoot B) in film group device.Can pass through transferpump (working shaft) 64 utilization in case of necessity and produce clear water in the ponds 65, in stream, add sterilant or other auxiliary agents regularly carry out backwash, the dirt on removal film surface through auxiliary agent add-on system 641.
3, reverse osmosis process flow process
The high-quality water outlet that ultrafiltration purifies (coming self-produced pond 65) is sent into reverse osmosis unit shown in Figure 3 as pending former water, through pretreatment system (for example add-on systems such as Scale inhibitors, reductive agent, sterilant) enter in the strainer 71,72 filter after, be transported in the reverse osmosis membrane assembly 74 (can have as required how group is connected in series) by pump 73, the product water 75 that obtains after reverse-osmosis treated is sent to water reservoir, and the dense water 76 that produces then is sent to reverse osmosis concentrated pond by water shoot C.
Equally, this reverse osmosis advanced refining plant has also designed cleaning system, comprise flushing with clean water and matting: between flush box 80 and reverse osmosis membrane assembly 74, be serially connected with flushing pump 81, thereby the clear water in the flush box 80 is washed through flushing pump 81 input reverse osmosis membrane assemblies 74, water outlet after the cleaning is discharged through water shoot C, or sends into clean-out system storage tank 90 as the clean cycle water; The inlet of reverse osmosis membrane assembly 74 also links to each other with chemical storage tank 90 with scavenging pump 91 by strainer 92, chemical cleaning solution in this storage tank 90 flows into membrane module 74 through scavenging pump 91 and strainer 92, water outlet is got back in the storage tank 90 through water return pipeline, discharges through water shoot C.
Embodiment 2
Utilize the efficient molten gas of embodiment 1 to increase the journey air-floating apparatus, oily(waste)water is handled.Test conditions: pressure air-dissolving water 0.54MPa, the mistake pumping capacity of intake pump (raw water pump 32) is 600L/ hour, the mistake pumping capacity of producing water pump 42 is 1400L/ hour, the mistake pumping capacity of air-water mixing pump 51 800L/ hour, composite flocculation agent add-on 50ppm, it is the mixture of polymerize aluminum chloride and polyacrylamide, and the compound proportion of the two is about 30: 1.
Treatment sewage (former water) is apparent to be oily(waste)water, visibility zero, and taste is little smelly, and BOD, COD content are low, the oil-contg height.
Above-mentioned sewage from former pond 31 mixes with flocculation agent after raw water pump 32 pumps into air supporting reaction tank 11 from top water-in 12, dissolved air water pressure behind knockout drum 52 from air-water mixing pump 51 is adjusted to 0.54MPa, send into air supporting reaction tank 11 (the microbubble size distribution that produces behind the dissolved air water release of pressure is at 20-60 μ m) from bottom inlet 13, respectively through being in contact with one another the air supporting process that realizes after the choked flow of spoiler 14, impurity in the sewage with bubble through the water column after microbubble combines and form the sewage layer, after the sewage lamination is gathered to a certain degree, the overflow weir 15 that can overflow and highly be lower than air flotation pool 10, be pooled in the sump 16, be discharged to (concrete device and flow process are referring to embodiment 1) in the sewage lagoon 21 by sump pump 22.
Get two groups of water samples and carry out the air supporting processing respectively, the product water in former water and the clean water basin is carried out water quality analysis, the results are shown in Table 1:
Table 1
| Water sample | Oleaginousness ppm | Oil removal rate % | Composite flocculation agent ppm | |||
| 1 | 2 | 1 | 2 | 1 | 2 | |
| Former water | 101 | 103 | - | - | 50 | 50 |
| Produce water | 4.35 | 3.39 | 95.69 | 96.70 | 13.02 | 12.94 |
The product water oil removal rate that obtains reaches more than 95%.The polyacrylamide add-on is 1.61ppm in the composite flocculation agent, produces the residual quantity 0.42ppm in the water, and is less to the pollution of ultra-filtration membrane, can directly carry out ultrafiltration; Other component of composite flocculation agent does not have influence to ultra-filtration membrane.
Embodiment 3
Directly enter the ultra-filtration equipment of embodiment 1 after the air supporting product water process ozone oxidation sterilization among the embodiment 2, the reverse osmosis unit that the water after the processing enters embodiment 1 carries out the deep purifying processing, describes among flow process such as the embodiment 1.
Wherein, ultra-filtration membrane adopts Ke Shi-V8048-35PMC, and reverse osmosis equipment adopts BW4040 Tao Shi film, and in the treating processes, ultra-filtration membrane adopts and just washing and backwash washing water quantity 10-12L/m
2.s, backwash time 4min.Final water-quality guideline of producing water sees Table 2:
Table 2
| Detect index | Former water (before the ultrafiltration) | Produce water |
| Oleaginousness ppm | 4.35 | 0.799 |
| Turbidity NTU | 9.93 | 0.55 |
| Dissolved solid mg/L | 689.4 | ≤20 |
| Specific conductivity Us/cm | 850 | ≤30 |
| Fully hard degree H0mg/L | 340 | ≤6 |
| SiO2mg/L | 3.06 | Trace |
As seen, the water through reverse-osmosis treated has been high-quality water.
Claims (10)
1, oil-containing sewage treatment technique, it is characterized in that, at first adopt dissolved air flotation process to dispose of sewage, the product water that obtains is handled through ultrafiltration membrane system and is obtained high-quality reuse water, and this ultrafiltration product water also optionally adopts reverse osmosis treatment system to carry out deep purifying becomes high-quality water; Wherein, when adopting air supporting to handle, make the prior sewage that has added flocculation agent enter air flotation pool, and the microbubble of pressure air-dissolving water generates is to enter air flotation pool from the air flotation pool bottom, makes treatment sewage and dissolved air water form counter current contact in air flotation pool from the top of air flotation pool.
2, the described oil-containing sewage treatment technique of claim 1, wherein, the water of handling through air-float technology enters the ultrafiltration membrane treatment system and carries out purifying treatment.
3, claim 1 or 2 described oil-containing sewage treatment techniques, wherein, the product water after air-float technology is handled enters the ultrafiltration membrane treatment system, and the product water that comes out from film group device enters reverse osmosis treatment system realization deep purifying again, becomes high-quality water.
4, the described oil-containing sewage treatment technique of claim 1, wherein, when air supporting is handled, make the pressurized mixing in air-water mixing pump of former water and air form dissolved air water, this dissolved air water is sent into air flotation pool earlier again after knockout drum is regulated pressure, control enters the microbubble particle diameter of air flotation pool at 20-60 μ m.
5, claim 1 or 4 described oil-containing sewage treatment techniques, wherein, making the pressure of dissolved air water after knockout drum is regulated from air-water mixing pump is 0.2-1MPa.
6, claim 1 or 4 described oil-containing sewage treatment techniques wherein, are realized counter current contact through the choked flow element that is provided with in the air flotation pool earlier respectively when making the microbubble of oily(waste)water and pressure air-dissolving water enter air flotation pool again.
7, realization is to the water treating equipment of oily(waste)water purifying treatment, it comprises the combination of pressurized dissolved air flotation device and ultrafiltration membrane treatment device, wherein, the air flotation pool top of described pressurized dissolved air flotation device is provided with sewage inlet, the bottom is provided with the dissolved air water inlet, and described dissolved air water inlet is connected in the water source by a dissolved air water transfer lime, and string is provided with air-water mixing pump on this dissolved air water transfer lime, and is serially connected with knockout drum between described air-water mixing pump and the dissolved air water inlet.
8, the described water treating equipment of claim 7, it is combined by pressurized dissolved air flotation device, uf processing device and reverse-osmosis treated device.
9, claim 7 or 8 described water treating equipment wherein, also comprise in uf processing device and the reverse-osmosis treated device and just washing and/or backwashing mechanism.
10, the described water treating equipment of claim 7, wherein, described air flotation pool is inboard and be provided with one or more choked flow element between sewage inlet and dissolved air water inlet.
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