CN101633541B - Integrated technology for deep purification treatment for printing and dyeing waste water - Google Patents
Integrated technology for deep purification treatment for printing and dyeing waste water Download PDFInfo
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Abstract
The invention discloses integrated technology for reclaiming lightly-polluted printing and dyeing waste water or printing and dyeing waste water achieving a certain discharge standard through deep purification treatment for production. A related process of the technology mainly comprises an adjusting tank, a pressure moving bed bio-film reactor, a ceramsite and activated carbon biological filter, an air floating system, a laminated filter and an ultra-filtration and reverse osmosis system. The technology is characterized in that the technology improves the prior biochemical technology, and carries out process integration by combining technology such as ozone oxidation, air flotation, membrane separation and the like. The regeneration of the printing and dyeing waste water can be realized by adopting the treatment technology, and the regenerated water quantity can reach 70 to 80 percent; and the technology not only can effectively solve the pollution problem of the printing and dyeing industry and protect the environment, but also can provide theoretical and technical support for realizing closed-loop circulation of the printing and dyeing waste water and popularizing clean production in the printing and dyeing industry.
Description
Technical field
The present invention relates to a kind of slight pollution dyeing waste water or process and handle the dyeing waste water that reaches certain emission standard is back to production after deep purifying is handled integrated technology.
Background technology
China is lack of water country, per capita Freshwater resources 2200m only
3, be 1/4 of world average level, and skewness, even some areas serious water shortage is in the abundant relatively southeastern coastal areas of water resources, also because seriously polluted formation water quality type lack of water.Dyeing is water rich and influential family still not, also be the discharging rich and influential family of waste water, in each industrial trade of the whole nation, the textile printing and dyeing wastewater quantity discharged occupies the 5th, account for 7.5% of national trade effluent statistics quantity discharged, the dyeing waste water of wherein annual discharging is about 11.3 hundred million tons (account for textile printing and dyeing industry waste water 80%), accounts for 6% of national discharged volume of industrial waste water.Because China's dyeing and printing process is backward relatively, product specification is low, and water consumption, quantity discharged is big, the waste water quality pollution level is higher much than developed country.For example German cotton dyeing water amount per ton is 100 tons, and China's common level is 300 tons, even 400 tons.In the dyeing waste water of these dischargings, 10%～15% printing and dyeing component enters environment with waste water, and these components are dyestuff, auxiliary agent and poisonous and hazardous heavy metal, formaldehyde, halogenide, inorganics, the sulfide of difficult degradation mostly.Concentration of organic wastewater height, of a great variety, complex structure belong to unmanageable trade effluent.Along with the development of chemical industry, the dye species that uses in the dyeing process is more and more, and composition becomes increasingly complex, and based on the traditional technology of biological treatment, has been difficult to adapt to the processing of biodegradability dyeing waste water worse and worse merely.
In the face of the shortage day by day and the severe contamination of water resources,, dyeing waste water is carried out deep purifying is handled and reuse is very necessary no matter from reducing the enterprise cost angle still from the demand for development of social enviroment protection.Present China printing and dyeing enterprise water reclamation rate is 7% (mainly still being water coolant etc.) only, whole textile industry reclamation rate less than 10% is the minimum of all industries of the whole nation, therefore employs new technology, conserve water resource, the reclamation rate that improves water are the very important and difficult tasks of textile printing and dyeing industry.
The present situation that printing-dying wastewater recycling is handled: the dyeing water leading indicator has colourity, pH, opacity and hardness, in addition is iron and manganese, back two main when dying light cloth generation " spot " relevant.Dyeing waste water is a big class, different fibers (comprising cotton, hair, fiber crops, silk and various man-made fiber) used dyestuff difference (comprising dyestuffs such as activity, acidity, positively charged ion, dispersion), its dyeing difference, particularly finishing technique difference, its water quality differ very big.The reuse emphasis of present domestic dyeing waste water is mainly on the relative lighter waste water of pollution such as silk printing and dyeing and knitting printing and dyeing, the technology of Treatment for Reuse mainly is to carry out three grades of advanced treatment on the basis of original treatment of dyeing wastewater, and technology commonly used mainly contains: coagulation, absorption, oxidation (electrochemical oxidation, photochemical oxidation), biotechnology (BAF, gac biological filter) and membrane technique etc.From the operating performance of reality, single method is difficult to thorough treatment of dyeing and printing, and ordinary method is to take the method for technology coupling, could comparatively effectively handle and the reuse dyeing waste water, but also have defectives such as running cost height, effluent quality instability.Because technical bottleneck, the reclamation rate of waste water is relatively low at present, and generally between 20%～30%, reuse water is mainly used in the not too high former process of water quality requirement.
Summary of the invention
The objective of the invention is to: at a series of problems that exist in the existing treatment method of printing and dying wastewater, a kind of industrialized integrated technology that is easy to is provided, carry out effective deep purifying to the slight pollution dyeing waste water or through handling the dyeing waste water that reaches certain emission standard, when administering dyeing waste water, realize the regeneration and the reuse of dyeing waste water.Waste water after this method is handled can branch matter use in each dyeing process, does not influence the dyeing and printing products quality, and the rate of recovery is higher than prior art, and investment is reasonable, the technology practical.This technology not only can effectively solve the pollution problem of dyeing, and the protection environment also can be in dyeing and to promote cleaner production the theory and technology support is provided.
Purpose of the present invention is implemented by following technical scheme.
Dyeing waste water is through lighter the clearing water or reach " textile dyeing and finishing industrial water pollution thing emission standard " (GB4287-92) after the integrated printing and dyeing waste water of one-level or secondary discharge standard is collected by pipe network of the shunting after stain of removing contamination, remove suspended impurity through grid, enter equalizing tank.The main function of equalizing tank is homogenizing water quality, keeps system's flooding velocity constant, simultaneously, also is provided with return line and soft or hard filler in the pond, but so equalizing tank double as reaction tank also except that playing the regulating pondage effect, partly purify water.Subsequently, waste water is pressed into the air water mixing tank after the force (forcing) pump pressure boost, and the pressurized air of sending here with air compressor machine enters the pressure MBBR by the road behind the molten gas of in-tank mixing.Dress floating stuffing in the pressure MBBR, the dystrophic microorganism that can grow is as pseudomonas, Aeromonas hydrophila and bacillus etc.These oligotrophic microorganisms's specific surface areas are big, organism in the waste water there is bigger avidity, specific growth rate and Monod constant are all less, nutraceutical competition had bigger advantage, simultaneously because the pressure in the MBBR is non-pressurized several times, increased the concentration of oxygen in water, made useless water oxygen improve greatly, accelerated biochemical reaction rate to the efficient that microorganism shifts.The water outlet part of this reactor is back to equalizing tank, and another part causes haydite-gac biological filter by the road.This filter tank is made up of substrate layer, many particle diameters haydite filtering layer and gac filtering layer.In this stage, the filtrate in the filter tank not only plays a part to cut dirty, and also owing under the specified conditions of molten gas, pressure and oxygen enrichment, also play a part bio-carrier, promptly the microorganism that grows on filtering while filtrate is also degraded to pollution substance.Because under the environment of oxygen enrichment and little pollution, the microbial film on the gac upgrade and rate of oxidation than high under the normal pressure, the degraded of hard-degraded substance and the biomembranous renewal that comes off are carried out synchronously, so the gac in filter tank needn't periodic regeneration, duration of service is long.
The water outlet of haydite-gac biological filter relies on the pressure portion of self to be back to equalizing tank, and rest part enters air-flotation system.In conjunction with the characteristics of dyeing waste water, before entering air supporting by dosing pump toward the water inlet in dosing coagulant.Because the air supporting water inlet itself is the dissolved air water that contains air, therefore compare with conventional air-flotation system and can save pressure air-dissolving equipment, add the ozone water of pressurization simultaneously in air supporting water inlet place, utilize the strong oxidizing property of ozone, remove slurry, dyestuff, auxiliary agent and the ferromanganese ion of colourity, fine suspension and difficult for biological degradation in the water.The ozone water part of pressurization is delivered to equalizing tank by the road, and the waste water that enters equalizing tank is carried out pre-ozone, improves its biochemical.After the process ozone oxidation, the active sludge cenobium of killing, the oxidized formed hydroxide colloid of ferromanganese ion, various suspended substance and the micro-bubble of from water, separating out, absorption come-up is mutually finally removed by the slag scraper of air-flotation system.Air-flotation system top also is provided with collection and confinement of gases and ozonolysis equipment, can open the ozone that the ozonolysis equipment branch parses as required, reduces environment damage, and the oxygen that obtains behind the ozone decomposition is delivered to equalizing tank by pipeline and is used for aeration.When ozonolysis equipment is closed, the air-flotation system bubbing of collecting is delivered to equalizing tank, carry out pre-ozone and aeration by gas collector.
After the air-flotation system water outlet enters intermediate water tank by pipeline, through entering laminated filter after the force (forcing) pump pressurization.The effect of intermediate water tank is regulating pondage on the one hand, is on the other hand to guarantee that water inlet has enough residence time, and the decay ozone in water is to protect follow-up membrane element.Laminated filter is secondary filter; the polypropylene plastics charging tray that its basic filtering element is one group of with groove, the groove on the adjacent disc forms the multiwalled filtering accuracy, and solids in the water is held back; its filtering accuracy is 50～100 μ m, can protect follow-up ultra-filtration membrane not by impurity scratch film surface.The water outlet of lamination strainer enters ultrafiltration-reverse osmosis system, and in the uf processing stage, the less solute of water molecules and molecular weight sees through film, and greater than the particulate of fenestra, macromole etc. owing to sieving action is trapped.The ultrafiltration water outlet can be used for the not high part of water quality requirement in the dyeing process.Most of soluble salt part, colloid, organism and part microorganism during reverse osmosis unit then utilizes the characteristic of reverse osmosis membrane to make a return journey to dewater.Ultrafiltration-reverse osmosis system water outlet generally can reach the soft water standard of dyeing process, but because reverse osmosis water outlet general pH is on the low side, therefore needs could finally be back to production by regulating pH.
Description of drawings
Accompanying drawing is handled the process flow sheet of integrated technology for dyeing waste water deep purifying of the present invention.
Shown in the figure: 1, equalizing tank; 2,9, air compressor machine; 3,8, air water mixing tank; 4, pressure MBBR; 5, haydite-gac biological filter; 6, collection and confinement of gases and ozonolysis equipment; 7, air-flotation system; 10,15, intermediate water tank; 11, air filter; 12, ozonizer; 13, laminated filter; 14, ultrafiltration system; 16,18 feed liquid torage tankes; 17, reverse osmosis system; P1, P3, P4, force (forcing) pump; P2, P5, dosing pump; V1-V21, valve
Embodiment
The invention will be further described below in conjunction with accompanying drawing and case study on implementation.
As shown in drawings, with dyeing waste water through lighter the clearing water or reach " textile dyeing and finishing industrial water pollution thing emission standard " (GB4287-92) after the integrated printing and dyeing waste water of one-level or secondary discharge standard is collected by pipe network of the shunting after stain of removing contamination, remove suspended impurity through grid, enter equalizing tank 1, equalizing tank is provided with pre-ozone pipeline and dissolved air water return line, is provided with the soft or hard filler in the pond simultaneously.Equalizing tank is except that playing the regulating pondage effect, but also pre-ozone of double as and aerobic reaction tank partly purify water when improving the water inlet biochemical.Subsequently, waste water is pressed into air water mixing tank 3 after force (forcing) pump P1 pressure boost, and the pressurized air of sending here with air compressor machine 2 reaches valve V4 by the road and at first enters pressure MBBR 4 behind the molten gas of in-tank mixing.Be filled with floating stuffing in this reactor, diameter is 70～150mm, and density is 0.8～0.98g/cm
3, the admission space ratio is 70%～75%.Floating stuffing be microorganism main perch, breed the place, can adsorb and degrading waste water in most dissolved organic matter, reduce waste water COD cr content.Operating pressure in the reactor is 0.25～0.55MPa, can increase considerably the dissolved oxygen concentration in the water, makes that oxygen improves greatly to the efficient that microorganism shifts in the mixed solution, helps the propagation of active sludge microorganism and to organic degraded.
30～50% of pressure MBBR water outlet is back to equalizing tank by return line and valve V5, and 50～70% cause haydite-gac biological filter 5 by pipeline and valve V8.In this stage, haydite and gac not only play a part a section dirt and filter and absorption, owing to be in oxygen-enriched environment, can also play the bio-carrier effect, when waste water passes through, and the pollution substance in the aerobic microbiological while degradable water.Haydite filtering layer tap density in haydite-gac biological filter is 0.3～0.9g/cm
3Operating pressure in granularity of activated carbon 10～30 orders 〉=90%, reactor is 0.25～0.45MPa.The pressure that the water outlet in this filter tank relies on self by pipeline and valve V9 with 20～30% effluent recyclings to equalizing tank, 70～80% water outlets cause air-flotation system 7 by pipeline and valve V12.
Because water inlet itself is the dissolved air water that contains air, therefore compares and to save pressure air-dissolving equipment with conventional air-flotation system.In conjunction with the characteristics of dyeing waste water, water inlet before entering air-flotation system by feed liquid torage tank 18 and dosing pump P2 dosing coagulant in intake.Coagulating agent is polymerize aluminum chloride PAC, and coagulant aids is polyacrylamide PAM, and the PAC addition is 10～50mg/L, and the addition of PAM is 0.5～5mg/L.Simultaneously, add the ozone water of pressurization, utilize the strong oxidizing property of ozone, remove slurry, dyestuff, auxiliary agent and the ferromanganese ion of colourity, fine suspension and difficult for biological degradation in the water in air supporting water inlet place.The ozone dosing system is made up of ozonizer 12, air filter 11, air compressor machine 9 and air water mixing tank 8.The ozone dissolved air water is delivered to air-flotation system water inlet place with valve V13 by the road, and ozone oxidation is carried out in water inlet.After the ozone oxidation, the active sludge cenobium of killing, the oxidized formed hydroxide colloid of ferromanganese ion, various suspended substance and the micro-bubble of from water, separating out, absorption come-up is mutually finally removed by the slag scraper of air-flotation system.The ozone water part of pressurization reaches valve V1 by the road and delivers to the equalizing tank front portion, the waste water that enters equalizing tank is carried out pre-ozone, to improve its biochemical.The pressure of pressurized ozone is 0.3～0.45MPa, and the dosage of pre-ozone is 1～8mg/L, and pneumatically supported ozone dosage is 2～12mg/L.Air-flotation system top is provided with collection and confinement of gases and ozonolysis equipment 6, can open the ozonolysis equipment ozone decomposition as required, reduces the pollution to environment.The oxygen that obtains behind the ozone decomposition is delivered to equalizing tank by pipeline and valve V3 and is used for aeration.When ozonolysis equipment is closed, directly the bubbing of collecting is delivered to equalizing tank, carry out pre-ozone and aeration by gas collector and valve V2.5～10% water outlets of air-flotation system enter air water mixing tank 8, and all the other water outlets enter intermediate water tank 10.
The water outlet of intermediate water tank 10 enters laminated filter 13 by force (forcing) pump P3 pressurization by the road with behind the valve V14.The effect of laminated filter is to remove fine impurities to protect follow-up pleurodiaphragmatic in terspace spare, and its water outlet enters ultrafiltration system 14 by valve V17.The ultrafiltration system operating pressure is 0.1～0.3MPa, and mould material is a kind of of polyvinylidene difluoride (PVDF), polyethersulfone or composite polrvinyl chloride hollow-fibre membrane, and molecular weight cut off is 8～120,000 dalton; The filtrate CODcr of ultrafiltration system＜30mg/L, electricity lead＜1000 μ s/ms, turbidity＜5NTU, SS＜10mg/L, colourity＜30 times, reach " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) first discharge standard.After the filtrate of ultrafiltration entered intermediate water tank 15, a part of water outlet was back to the workshop with valve V18 by the road, was used for the relatively low operation of water quality requirement, for example was used in boiling, floated operations such as reason; Part water outlet enters reverse osmosis system 17 after being pressurizeed by force (forcing) pump P4 with valve V19 by the road, and waste water is further purified.The pleurodiaphragmatic in terspace spare of reverse osmosis system is that the magnesium sulfate rejection rate is 99.8% aromatic polyamide membrane, and structure formation is rolling, and the pressure of reverse osmosis system is 0.8～2.0MPa.Reverse osmosis system water outlet CODcr＜10mg/L electricity is led＜200 μ s/ms, turbidity, SS and colourity all detect less than, can be used as the meticulous water in the dyeing and printing process.Because reverse osmosis water outlet general pH is on the low side, therefore need finally to be back to production by regulating pH to 6.5～8.5.Reverse osmosis pH regulator device is made up of dosing pump P5 and feed liquid torage tank 16.For preventing the accumulation of inorganic salt, the dense water of reverse osmosis system directly discharges by valve V21.
Pressure MBBR and haydite-gac biological filter all is equipped with vent valves (V7, V11) and respective line, the recoil water and the wash-down water of pressure MBBR, haydite-gac biological filter and ultrafiltration-reverse osmosis system return equalizing tank through valve (V6, V10, V15, V16, V20) and respective line.
In concrete implementation process, according to the difference of each printing and dyeing mill's production technique and used dyestuff, auxiliary agent etc., processing parameters such as the biochemical unitary residence time, coagulant charging quantity, each stage ozone dosage and each system works pressure can be done the adjustment of suitable proportion.Below be the test case of three concrete actual motion projects:
Embodiment one
The dyeing and finishing wastewater treatment facility is had in certain textile printing and dyeing company, and effluent quality reaches the secondary discharge standard of " textile dyeing and finishing industrial water pollution thing emission standard " (GB 4287-1992).For cutting down the total emission volumn of COD, improve the water surrounding of region, the conserve water resource reduces production costs simultaneously, and the said firm requires dyeing waste water is carried out advanced treatment and is back to production.Now adopt this technology to carry out pilot experiment, amount of inlet water is 100t/d.
Following form is the reuse standard that system's influent quality and production plant are applicable to weaving wet treatment requirement.
Pilot scale plant is formal to be implemented after three months, and the treatment effect of each processing unit is as follows:
| Controlling index | The equalizing tank water outlet | Haydite-gac biological filter water outlet | The air-flotation system water outlet | The ultrafiltration system water outlet | Reverse osmosis system water outlet (behind the pH regulator) |
| pH | 7.25 | 7.8 | 7.4 | 6.8 | 7.5 |
| CODcr(mg/L) | 156 | 32 | 25 | 15 | 4 |
| Turbidity (NTU) | 20 | 5 | 2.5 | 0.1 | 0.06 |
| Colourity (degree) | 95 | 55 | 35 | 5 | 0 |
| Iron (mg/L) | 0.35 | 0.07 | 0.05 | Do not detect | Do not detect |
| Manganese (mg/L) | 0.5 | 0.4 | 0.06 | 0.03 | Do not detect |
| Electricity is led (μ S/cm) | 1547 | 1255 | 1025 | 825 | 15 |
The water reclamation rate reaches about 80% in this system, and reuse water mainly divides two portions.Ultrafiltration filtrate about 65% is used for slightly washing reuse, promptly is used in boiling except that dyeing, floats the relatively low operation of water quality requirement such as reason; Other 35% ultrafiltration water outlet enters reverse osmosis system.Final treat effluent is back to smart water, promptly is back to the washing water in the workshop dyeing process of dying cloth or the soft water of dyeing and printing process.According to measuring and calculating, the total operating cost (comprising the electricity charge, medicament expense and wage) that is used for slightly washing reuse is 1.32 yuan/ton.The processing cost that is used for smart water reuse is 1.95 yuan/ton.Adopting product colourity, the glossiness of this part reuse water production at present still is that pliability all reaches the quality product requirement.Therefore the deep purifying that adopts this technology to carry out dyeing waste water is handled and reuse, when obtaining social influence, has also obtained good economic benefit.
Embodiment two
Certain company's dyeing waste water deep purifying treatment project, pre-treatment, dyeing and aftertreatment in the waste water main source dyeing and printing process, treatment capacity is 150t/d, and used dyestuff is mainly reactive dyestuffs, and part is dispersed dye, and adjuvant used is alkali and former bright powder etc.Waste water enters this process system after intra-company's waste water station is handled, below be the index of correlation of this art breading:
According to the above data presentation of surveying, the every water-quality guideline of this project water outlet all reaches and surpasses the reuse water requirement, and water outlet has been back to the pre-treatment and the dyeing process of dyeing and printing process process, the reuse water yield about 75%.According to the mass analysis to dyeing product, its colour fastness, soaping fastness are all more than 4 grades.Therefore, the dyeing waste water of handling by this technology deep purifying can be back to the printing and dyeing production process, to not influence of product quality.
Embodiment three
To be a family be processed as main enterprise to produce knitted fabric and dyeing and finishing in certain Knitting Company Ltd, produces in the waste discharge and contain abundant residues dyestuff, auxiliary agent, slurry, salkali waste, fiber and inorganic salt etc., and organic content height, colourity are big, pH changes greatly.The waste discharge every day 3000m of this factory
3/ d, waste water COD cr are that 1400mg/L, BOD are that 200mg/L, SS are 400mg/L, 700 times of colourities, pH value 7～9.The existing cover waste disposal plant of this factory, treatment process is coagulating sedimentation-acidication-aerobic-coagulating sedimentation-biological filter, handles back water outlet majority parameters except that colourity and can reach " textile dyeing and finishing industrial water pollution thing emission standard " first discharge standard (GB4287-92).The deep purifying that now this waste discharge is adopted this technical process to carry out the 120t/d scale is handled pilot experiment, below is the related data of this process stabilizing operation after 3 months:
From the running condition of reality, the reverse osmosis produced water water quality of existing technology is far superior to existing fresh water index near pure water indexes, has only a spot of water discharging in the technological process.Along with producing, enterprise develops to expensive goods, the corresponding raising of process water water quality requirement, the popularization of present technique can provide reliable guidance for the quality-improving of dyeing and printing products, saves great amount of water resources when alleviating environmental pollution, realizes the cleaner production of dyeing process.
From the project example of above enforcement as can be seen, this integrated technology combines the series of advantages of biochemistry-materialization-membrane separation technique, aspect processing of dyeing waste water deep purifying and reuse, can remove pollutant in water effectively, reduce specific conductivity, total solids and hardness in the water, have good decolouring desalination effect, and running cost is reasonable.The integrated technology that the dyeing waste water deep purifying is handled, both the conserve water resource alleviated the pollution of dyeing waste water to environment again, for the energy-saving and emission-reduction of textile printing and dyeing industry are laid a good foundation.
Claims (6)
1. the integrated technology handled of a dyeing waste water deep purifying is characterized in that:
1) reaches " textile dyeing and finishing industrial water pollution thing emission standard " (GB4287-92) after the integrated printing and dyeing waste water of one-level or secondary discharge standard is collected by pipe network, remove suspended impurity through grid, enter equalizing tank, the equalizing tank front portion is provided with ozone preaeration pipeline, to improve the biodegradability of water inlet; Also be provided with return line and soft or hard filler in the pond, equalizing tank is gone back double as aerobic reaction pond except that playing the regulating pondage effect, and part purifies water;
2) waste water is pressed into the air water mixing tank after the force (forcing) pump pressurization, the pressurized air of sending here with air compressor machine is behind the molten gas of in-tank mixing, at first enter the pressure MBBR by the road, dress floating stuffing in this reactor, it is the place that microorganism perches, breeds, most dissolved organic matter in energy absorption and the degradation water, simultaneously, because the pressure in this reactor is non-pressurized several times, increased the concentration of oxygen in water, make useless water oxygen strengthen greatly, improved speed of reaction to the efficient that microorganism shifts;
3) water part of pressure MBBR is back to equalizing tank, part causes haydite-gac biological filter by the road, this filter tank is made up of substrate layer, many particle diameters haydite filtering layer and activated carbon filter layer, filtrate in the pond not only plays a part to cut dirty, also because under the specified conditions of molten gas, pressure and oxygen enrichment, filtrate also plays a part bio-carrier, simultaneously pollution substance is degraded filtering;
4) water outlet of haydite-gac biological filter relies on the pressure portion of self to be back to equalizing tank, part is by entering air-flotation system behind the dosing pump dosing coagulant, because water inlet itself is the dissolved air water that contains air, therefore compare the pressure air-dissolving equipment that saves with conventional air-flotation system, simultaneously, add the ozone water of pressurization in air supporting water inlet place, utilize the strong oxidizing property of ozone, remove slurry, dyestuff, auxiliary agent and the ferromanganese ion of colourity, fine suspension and difficult for biological degradation in the water, the top of air-flotation system is provided with collection and confinement of gases and ozonolysis equipment;
5) the air supporting water outlet enters ultrafiltration-reverse osmosis membrane separation system through laminated filter, pass through ultra-filtration membrane, the less solute of water molecules and molecular weight sees through film, and greater than the particulate of fenestra, macromolecular substance is owing to sieving action is trapped, most of soluble salt part during reverse osmosis unit then utilizes the characteristic of reverse osmosis membrane to make a return journey to dewater, colloid, organism and part microorganism, the lower operation of ultrafiltration filtrate part direct reuse water quality requirement in dyeing and printing process, the reverse osmosis water outlet is because pH is generally on the low side, therefore need just can be back to the higher operation of water quality requirement in the dyeing and printing process by after regulating pH.
2. the integrated technology of handling according to the described a kind of dyeing waste water deep purifying of claim 1 is characterized in that in the step 2 that the diameter of the floating stuffing that described pressure MBBR is built-in is 70～150mm, and density is 0.8～0.98g/cm
3, the admission space ratio is 70%～75%, the operating pressure in the reactor is 0.25～0.55MPa.
3. the integrated technology of handling according to the described a kind of dyeing waste water deep purifying of claim 1 is characterized in that in the step 3 that its tap density of haydite filtering layer in described haydite-gac biological filter is 0.3～0.9g/cm
3Operating pressure in granularity of activated carbon 10～30 orders 〉=90%, reactor is 0.25～0.45MPa.
4. the integrated technology of handling according to the described a kind of dyeing waste water deep purifying of claim 1, it is characterized in that in the step 4, dissolved air water in the air-flotation system dependence water inlet is separated out bubble and is carried out air supporting in normal pressure, while adds the ozone water of pressurization in air supporting and equalizing tank water inlet place, ozone derives from ozonizer, adopting the air compressor machine pressing mode to carry out ozone adds, the pressure of pressurized ozone is 0.3～0.45MPa, the dosage of pre-ozone is 1～8mg/L, pneumatically supported ozone dosage is 2～12mg/L, and air-flotation system top is provided with collection and confinement of gases and ozonolysis equipment.
5. the integrated technology of handling according to the described a kind of dyeing waste water deep purifying of claim 1, its feature is in step 5, described ultra-filtration membrane material is a kind of of polyvinylidene difluoride (PVDF), polyethersulfone or composite polrvinyl chloride hollow-fibre membrane, molecular weight cut off is 8～120,000 dalton, and the membrane filter unit operating pressure is 0.1～0.3MPa; Described reverse osmosis membrane is that the magnesium sulfate rejection rate is 99.8% aromatic polyamide membrane, and structure formation is rolling, and the pressure of reverse osmosis system is 0.8～2.0MPa.
6. the integrated technology of handling according to the described a kind of dyeing waste water deep purifying of claim 1 is characterized in that in the step 5, in order to prevent the accumulation of inorganic salt, guarantees the normal operation of system, and the dense water of reverse osmosis system directly discharges.
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| CN105967448A (en) * | 2016-06-24 | 2016-09-28 | 华南师范大学 | Treatment method and treatment system for wastewater of textile industry |
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