CN103214153A - Regenerative cycle and utilization method for papermaking deep-treatment wastewater - Google Patents
Regenerative cycle and utilization method for papermaking deep-treatment wastewater Download PDFInfo
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Abstract
The invention discloses a regenerative cycle and utilization method for papermaking deep-treatment wastewater. The regenerative cycle and utilization method comprises the steps of chemical decalcification, filtration, electrolysis, biological aerated filter biochemical treatment, ultrafiltration and reverse osmosis. A chemical decalcification system can be used for effectively removing high-concentration calcium ions and magnesium ions in the papermaking deep-treatment wastewater, and the removal rate achieves 50%; the COD (chemical oxygen demand) is further reduced via nano-catalytic electrolysis; 70-85% of the papermaking deep-treatment wastewater can be regeneratively cycled and utilized via the treatment of the method disclosed by the invention, thus greatly reducing the water consumption index and the wastewater discharge index of per ton of paper, increasing the economic and technical indexes of enterprises, reducing the discharge of the wastewater, avoiding the pollution of the wastewater to environment, and reducing the waste of water resources; and the cost of the regenerated cycling water can be lower than the price of running water, so that the regenerative cycle and utilization method is economical, reasonable, and capable of generating good economic benefits.
Description
Technical field
The present invention relates to a kind of papermaking deep and handle wastewater treatment method, particularly relate to a kind of recycling utilization method of handling waste water based on the papermaking deep of chemical decalcification technology, electrochemical techniques and membrane technique.
Background technology
Paper-making effluent is meant the cooking waste liquor (claiming black liquor, red liquid again) that chemical pulping produces, the plain boiled water that produces in the middle section water that produces in the pulp washing bleaching process and the machine hand's preface.General every production 1t sulfate pulp just has 1t organism and 400kg bases, sulfide to be dissolved in the black liquor; Producing the 1t sulfite pulp has 900kg organism and 200kg oxide compound (calcium, magnesium etc.) to be dissolved in the red liquid with sulfide approximately.Waste liquid enters in the rivers not only severe contamination water source, and causes a large amount of wastings of resources.Paper-making industry is traditional water rich and influential family, also is one of important source of pollution that cause the water pollution.At present, the first place that China's paper-making industrial waste water quantity discharged and COD quantity discharged all occupy China's all types of industries quantity discharged, paper industry is the most serious to the pollution of water surrounding, it is the matter of utmost importance of China's industrial pollution caused by paper manufacturing control still not, also is the matter of utmost importance that national trade effluent carries out processing up to standard and water saving.According to statistics, above papermaking in China county and county and paper products industry wastewater discharge account for 18.6% of national industrial total release, wherein handle the emission compliance amount and account for 49.3% of paper-making industrial waste water total release, COD accounts for 44.0% of national industrial COD total release in the waste discharge.Therefore, how eliminating that paper waste pollutes and make precious resources in the waste liquid obtain utilizing is the work with great social effect and economic worth, should attach great importance to.Along with expanding economy, China faces the problem of shortage of fresh water, scarcity of raw material day by day, and on the other hand, water pollutes also more and more serious.In recent years, through unremitting effort in many ways, the paper industry water prevention and cure of pollution have obtained certain achievement, though paper and paperboard production increase year by year, the COD in the waste discharge but reduces year by year.But at present the paper industry waste water that accounts for total emission volumn 50% does not carry out processing up to standard as yet, and paper waste is handled the few especially of back recycling, therefore, and paper waste prevention and cure of pollution and to recycle task also quite heavy.
The paper waste complicated component, biodegradability is poor, belongs to more unmanageable trade effluent, and its source and characteristics are:
1, cooking section waste liquid
Be the black liquor of alkaline process generation and the red liquid that acid polishing produces.Overwhelming majority paper mill is adopted alkaline process and is produced black liquor.Contained pollutent has accounted for more than 90% of industrial pollution caused by paper manufacturing total emission volumn in the black liquor, and has the characteristic of high density and difficult degradation, and its improvement is a great problem always.Main component in the black liquor has 3 kinds, i.e. xylogen, poly-pentose and total alkali.Xylogen is the nontoxic natural high molecular substance of a class, has purposes widely as industrial chemicals, and poly-pentose can be used as animal feed.
2, middle section water
The slurrying middle-stage wastewater is meant the waste water of discharging through the boiling slurry after the black liquid extraction in processes such as screening, washing, bleaching, color is deep yellow, accounts for 8%～9% of industrial pollution caused by paper manufacturing total emission volumn, about ton slurry COD load 310kg.Middle section water concentration is higher than sanitary sewage, and the ratio of BOD and COD is between 0.20 to 0.35, and biodegradability is relatively poor, and organism is difficult to biological degradation and intractability is big.Organism in the middle section water mainly is xylogen, Mierocrystalline cellulose, organic acid etc., based on solubility COD.Wherein, what environmental pollution was the most serious is the chlorine-contained wastewater that produces in the bleaching process, for example chlorination bleaching effluent, hypo(chlorite)bleaching waste water etc.Hypo(chlorite)bleaching waste water mainly contains trichloromethane, also contains other organic chlorides of kind more than 40, serves as at most with various chlorinated phenols wherein, as dichloro-phenol, three chlorinated phenols etc.In addition, contain toxic extremely strong carcinogenic substance Dioxins in the bleaching waste liquor, ecotope and HUMAN HEALTH have been caused serious threat.
3, plain boiled water
Plain boiled water is machine hand's section waste water, and it derives from the paper machine room paper making process.Plain boiled water mainly contains fiber fines, filler, coating and lysed timber composition, and the sizing material that adds, Wet Strength Resin, sanitas etc., and based on insoluble COD, biodegradability is lower, and the sanitas of its adding has certain toxicity.The plain boiled water water yield is bigger, but its contained organic pollution load is well below black digestion liquid and middle-stage wastewater.Nearly all paper mill paper machine room has all adopted part or totally-enclosed system to reduce the papermaking water loss now, saves power consumption, improves the plain boiled water reclamation rate, reduces unnecessary plain boiled water discharging.
At present, be used for the method that paper waste handles and mainly contain: physical filtering method, coagulant sedimentation, absorption method, advanced oxidation processes, air supporting method, add sour absorption process, catalytic oxidation, biochemical process etc., every kind of method all has relative merits separately.Because single treatment process is difficult to be effective, in practice, normally according to the practical situation that will handle waste water, several method is used in combination, typical production technique be with paper waste through physical treatment such as filtrations grade, pass through behind the flocculation sediment qualified discharge after biochemical treatment more then.
Chinese patent CN101708927A discloses a kind of advanced treatment method for papermaking waste water of investing little, that technology is simple, pollutants removal rate is high, working cost is cheap oxidative degradation+flocculation sediment+sand filtration.COD＜70mg/L after this method is handled, BOD5＜20mg/L, SS＜30mg/L.
Chinese patent CN1420091 discloses a kind of Ecological Disposal and resource utilization recycle method of paper waste, and it is to utilize ecological engineering technology, and paper mill wastewater carries out BOD in settling tank
5: COD
CrThe ratio adjustment, enter the digestion of series connection anaerobic pond and facultative lagoon then, COD is carried out in draining in equalizing tank
Cr: N: after P ratio is adjusted, be distributed into many groups rainwash wetland in parallel by the transmission ﹠ distribution water system, water outlet is better than the primary standard of paper industry water pollutant discharging, can stay, replenish the required clear water of equalizing tank through the storage of the aerobic pool, is back to the rainwash wetland and carries out the degree of depth and handle.This method has overcome the shortcoming of paper waste trophic structure imbalance, biodegradability difference, can stablize the Ecological Disposal and the resource utilization recycle that realize paper waste effectively.
Chinese patent CN101337752 discloses a kind of advanced treatment process for paper-making waste water, this technology may further comprise the steps: the paper waste after secondary biochemical treatment is introduced little aeration iron reduction bed, load iron filings in little aeration iron reduction bed, paper waste carries out reduction reaction in little aeration iron reduction bed; Water outlet after 1. step handled is introduced in the coagulation basin, adds coagulating agent and coagulant aids in coagulation basin, impels the particle aggregation in the water; Water outlet after 2. step handled is introduced in the settling tank and is carried out mud-water separation; Filter in the water outlet introducing filtering basin with settling tank, the water outlet after the filtration is introduced the reuse water pipe network behind sterilization and disinfection; Mud in the settling tank and the sewage backwash water in the filtering basin are introduced sludge thickener, and outward transport is disposed after dewatering; Simultaneously, the overflowing liquid in dehydration filtrate and the sludge thickener is introduced in the coagulation basin and is handled.Technology of the present invention is simple, good decolorizing effect and with low cost.
Above method all obtains reasonable effect to technological process for the treatment of papermaking, but all exist the processing degree of depth not enough, the middle water of producing also contains more pollutent, can only be fit to some production technique not high to the water specification of quality, and its purposes consumption all is restricted.Make paper waste regeneration, satisfy the water requirement of various processes, the particularly requirement of high quality water, must carry out deep purifying to it and handle,, obtain pure water as the waste water of biochemical gained is handled through membrane filtration through further purifying again.Chinese patent 201010567041.0,201020635352.1 has been introduced papermaking deep and has been handled the method that waste water employing membrane filtration carries out recycling utilization, but in implementation process, find that calcium ion content is up to 150～400 mg/L in the paper waste, produce a large amount of foulings, the regeneration of waste water is caused serious difficulty.
Summary of the invention
The objective of the invention is at existing cost is higher in the existing paper waste treatment process, usefulness is lower, waste water after handling mostly is discharging, does not have problems such as advanced treatment recycle, waste water resource, providing a kind of combines with membrane technique based on chemical decalcification technology, electrochemical techniques, cost is lower, usefulness is higher, and the papermaking deep that makes it to reach recycle is handled the recycling utilization method of waste water.
The recycling utilization method that a kind of papermaking deep of the present invention is handled waste water may further comprise the steps:
(1) chemical decalcification
Second pond water outlet after the papermaking biochemical treatment (being that papermaking deep is handled waste water) flows into coagulation basin through pipeline, under agitation adds an amount of lime saturated solution adjust pH to 8.5～9.5 earlier by chemicals dosing plant in coagulation basin, adds the Na of 300 ~ 600mg/L again
2CO
3, add the FeSO of 5 ~ 10mg/L then
4, add Na again
2CO
3Anti-adjust pH to 8～9, the polyphenyl alkene acid amides (PAM) that adds 2 ~ 3mg/L at last, enter tube settler after reacting completely, carry out precipitate and separate, thereby remove calcium magnesium, reduction water hardness in the papermaking deep processing waste water, throw out (being mud) is sent in the sludge sump through pump and pipeline, carries out filtering separation at last in sludge dehydration device, and recovery lime carbonate, waste water then enters next step and filters;
(2) filter
Waste water after the chemical decalcification is pumped into more medium filter or filtering separation is carried out in sand filtration, further remove SS and colloid in anhydrating;
(3) electrolysis
Waste water after filtering is pumped into the electrolysis machine electrolysis, and the degraded organic macromolecule removes colourity, improves the biodegradability of waste water, and adjacent two interelectrode voltages of electrolysis machine are 2～12V, and current density is 10～320mA/cm
2
(4) BAF biochemistry
Waste water after the electrolysis enters BAF, by the oxidation degradation effect waste water is carried out fast purification, obtains papermaking and purifies liquid waste;
(5) ultrafiltration
The biochemical gained papermaking of BAF purified liquid waste carry out ultra-filtration filters, separate dialysis water and condensed water, dialysis water enters reverse-osmosis treated, condensed water is back to recycle in the electrolysis machine of step (2) through pipeline;
(6) reverse osmosis
Ultrafiltration gained dialysis water filters the back through security personnel and pumps into osmosis filtration film system with high-pressure pump, through reverse osmosis membrane filtration separate dialysis water and condensed water, the water of dialysing enters basin and gets reuse water; A condensed water part is separated the redundance discharging through the reflux membrane filtration that circulates of condensed water topping-up pump.
The described electrolysis machine of step (3) electrolysis is provided with power supply and electrolyzer, and the electrode materials in the described electrolyzer is a kind of in graphite, titanium, iron, aluminium, zinc, copper, lead, nickel, molybdenum, chromium, alloy and the nano-catalytic inert material; The top layer of described nano-catalytic noble electrode is coated with the metal oxide inertia catalyst coatings that crystal grain is 10～35nm, and the substrate of described nano-catalytic noble electrode is titanium plate or plastic plate.
The molecular weight cut-off of the described ultrafiltration of step (5) is 1000～50000MWCO, working conditions is normal temperature～45 ℃, described ultrafiltration is a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration or plate-type hyperfiltration, the operating pressure of immersion ultrafiltration is-1～-50kPa, and the operating pressure of pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration and plate-type hyperfiltration is 3～300kPa.
Reverse osmosis membrane assembly in the described reverse osmosis of step (6) is a rolled membrane module, and mould material is cellulose acetate film or a composite membrane in the organic membrane, and the molecular weight cut-off of mould material is 50～200MWCO, and entrance pressure can be 6.0～35.0bar, goes out to press to can be 4.5～33.5 bar.
The present invention had both overcome single with membrane filtration separating treatment or the too high defective of adsorption treatment cost, the treatment effect that has overcome conventional paper waste method again is undesirable, the defectives such as contaminated wastewater environment of discharging, existing papermaking deep is handled purification of waste water and recycle and reuse, compared with the prior art, have following outstanding advantage:
(1) papermaking deep is handled waste water through handling, and 70%～85% can recycling utilization, has both reduced discharge of wastewater, avoid the waste water environmental pollution, reduce water resource waste again, can also make regenerated recirculated water cost be lower than the tap water price, economical rationality produces favorable economic benefit.
(2) but handle high-concentration Ca magnesium ion in the waste water by chemical decalcification system effective elimination papermaking deep, clearance reaches 50%, guarantee subsequent treatment process smoothly, steady running.
(3) further reduce COD by the nano-catalytic electrolysis, the one, the reclamation rate of waste water is improved, both reduced discharge of wastewater, avoid the waste water environmental pollution, reduce water resource waste again; The 2nd, can kill the microorganisms such as bacterium in the waste water, eradicate the biological pollution of subsequent ultrafiltration film and reverse osmosis membrane, reduce the wash number of ultra-filtration membrane and reverse osmosis membrane significantly, reduce film cleaning regeneration cost, improve the service efficiency of film, prolong the work-ing life of film, reduce the film replacement cost.
(4) reduce the water consumption index and the discharge of wastewater index of ton paper significantly, improve the business economic technical indicator.
The alleged papermaking deep of the present invention is handled waste water and is meant that paper waste through second pond water outlet after traditional filtration, flocculation and the biochemical treatment, promptly reaches the waste water of emission standard more than three grades.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
The present invention be after composition, character and the existing processing scheme of existing papermaking deep being handled waste water are goed deep into the comparative study of system, finish to the purification of papermaking deep processed waste water and the design of recycling utilization method, it uses by the combination of methods such as chemical decalcification, electrolysis, membrane filtration, thereby forms a kind of purification and recycling utilization method that papermaking deep is handled waste water that be particularly suitable for.
1 the specific embodiment of the present invention is described with reference to the accompanying drawings.
Embodiment 1
500 ton per day papermaking deeps are handled the recycling utilization method of waste water.
It is as shown in table 1 after measured that described papermaking deep is handled the waste water quality index.
Table 1 papermaking deep is handled the water-quality guideline of waste water
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | Measured value |
| 1 | COD Cr | mg/L | 150 | 4 | Colourity | ? | 60 |
| 2 | SS | mg/L | 140 | 5 | Ca | mg/L | 200 |
| 3 | Specific conductivity | μS/cm | 1800 | 6 | Hardness | mmol/L | 4 |
(1) chemical decalcification
Papermaking deep is handled waste water and is flowed into coagulation basin through pipeline, under agitation adds an amount of saturated lime solution adjust pH to 8.5 earlier by chemicals dosing plant in coagulation basin, adds the Na of 600mg/L again
2CO
3, add the FeSO of 10mg/L then
4, add Na again
2CO
3Anti-adjust pH to 8, the polyphenyl alkene acid amides (PAM) that adds 2mg/L at last, enter tube settler after reacting completely, carry out precipitate and separate, thereby remove calcium magnesium, reduction water hardness in the papermaking deep processing waste water, throw out (being mud) is sent in the sludge sump through pump and pipeline, carries out filtering separation at last in sludge dehydration device, and recovery lime carbonate, waste water then enters next step and filters;
(2) filter
Waste water after the chemical decalcification is pumped into more medium filter carry out filtering separation, further remove SS and colloid in anhydrating;
(3) electrolysis
Waste water after filtering is pumped into the electrolysis machine electrolysis, and the degraded organic macromolecule removes colourity, and improves the biodegradability of waste water, and adjacent two interelectrode voltages of electrolysis machine are 2V, and current density is 10mA/cm
2
(4) BAF biochemistry
Waste water after the electrolysis enters BAF, by the oxidation degradation effect waste water is carried out fast purification, obtains papermaking and purifies liquid waste;
(5) ultrafiltration
The biochemical gained papermaking of BAF purified liquid waste carry out the immersion ultra-filtration filters, separate dialysis water and condensed water, dialysis water enters reverse-osmosis treated, condensed water is back to recycle in the electrolysis machine through pipeline;
(6) reverse osmosis
Ultrafiltration gained dialysis water filters the back through security personnel and pumps into osmosis filtration film system with high-pressure pump, through reverse osmosis membrane filtration separate dialysis water and condensed water, the water of dialysing enters basin and gets reuse water; A condensed water part is separated the redundance discharging through the reflux membrane filtration that circulates of condensed water topping-up pump.
Described immersion ultrafiltration working conditions is: normal temperature～45 ℃, operating pressure are-1～-50kPa; The membrane module of described reverse osmosis is a rolled membrane module, and mould material is a cellulose acetate film in the organic membrane, and entrance pressure can be 6.0～45.0bar, goes out to press to can be 4.5～33.5 bar.
Above-mentioned ultrafiltration is the immersion ultrafiltration, and ultrafiltration can be a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration or plate-type hyperfiltration.
The reuse water water-quality guideline is as shown in table 2 after measured.
The water-quality guideline of table 2 reuse water
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | Measured value |
| 1 | COD Cr | mg/L | 10 | 4 | Colourity | ? | 10 |
| 2 | SS | mg/L | ≤1 | 5 | Ca | mg/L | ≤1 |
| 3 | Specific conductivity | μS/cm | 100 | 6 | Hardness | mmol/L | 0.1 |
Embodiment 2
6000 ton per day papermaking deeps are handled the recycling utilization method of waste water.
It is as shown in table 3 after measured that described papermaking deep is handled the waste water quality index.
Table 3 papermaking deep is handled the water-quality guideline of waste water
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | Measured value |
| 1 | COD Cr | mg/L | 90 | 4 | Colourity | ? | 150 |
| 2 | SS | mg/L | 60 | 5 | Ca | mg/L | 160 |
| 3 | Specific conductivity | μS/cm | 1200 | 6 | Hardness | mmol/L | 2 |
(1) chemical decalcification
Papermaking deep is handled waste water and is flowed into coagulation basin through pipeline, under agitation adds an amount of saturated lime solution adjust pH to 9.5 earlier by chemicals dosing plant in coagulation basin, adds the Na of 300mg/L again
2CO
3, add the FeSO of 5mg/L then
4, add Na again
2CO
3Anti-adjust pH to 9, the polyphenyl alkene acid amides (PAM) that adds 2mg/L at last, enter tube settler after reacting completely, carry out precipitate and separate, thereby remove calcium magnesium, reduction water hardness in the papermaking deep processing waste water, throw out (being mud) is sent in the sludge sump through pump and pipeline, carries out filtering separation at last in sludge dehydration device, and recovery lime carbonate, waste water then enters next step and filters;
(2) filter
Waste water after the chemical decalcification is pumped into the sand filtration strainer carry out filtering separation, further remove SS and colloid in anhydrating;
(3) electrolysis
Waste water after the sand filtration filtration is pumped into the electrolysis machine electrolysis, and the degraded organic macromolecule removes colourity, and improves the biodegradability of waste water, and adjacent two interelectrode voltages of electrolysis machine are 6V, and current density is 320mA/cm
2
(4) BAF biochemistry
Waste water after the electrolysis enters BAF, by the oxidation degradation effect waste water is carried out fast purification, obtains papermaking and purifies liquid waste;
(5) ultrafiltration
The biochemical gained papermaking of BAF purified liquid waste carry out the pillar ultra-filtration filters, separate dialysis water and condensed water, dialysis water enters reverse-osmosis treated, condensed water is back to recycle in the electrolysis machine of step (2) through pipeline.
(6) reverse osmosis
Ultrafiltration gained dialysis water filters the back through security personnel and pumps into osmosis filtration film system with high-pressure pump, through reverse osmosis membrane filtration separate dialysis water and condensed water, the water of dialysing enters basin and gets reuse water; A condensed water part is separated the redundance discharging through the reflux membrane filtration that circulates of condensed water topping-up pump.
Described tubular type ultrafiltration working conditions is: normal temperature～45 ℃, and operating pressure is 3～300kPa; The membrane module of described reverse osmosis is a rolled membrane module, and mould material is a composite membrane, and entrance pressure can be 6.0～45.0bar, goes out to press to can be 4.5～33.5 bar.
Above-mentioned ultrafiltration is the tubular type ultrafiltration.Ultrafiltration can be a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration or plate-type hyperfiltration.
The reuse water water-quality guideline is as shown in table 4 after measured.
The water-quality guideline of table 4 reuse water
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | Measured value |
| 1 | COD Cr | mg/L | 6 | 4 | Colourity | ? | 5 |
| 2 | SS | mg/L | ≤1 | 5 | Ca | mg/L | ≤1 |
| 3 | Specific conductivity | μS/cm | 80 | 6 | Hardness | mmol/L | 0.05 |
Embodiment 3
20000 ton per day papermaking deeps are handled the recycling utilization method of waste water.
It is as shown in table 5 after measured that described papermaking deep is handled the waste water quality index.
Table 5 papermaking deep is handled the water-quality guideline of waste water
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | Measured value |
| 1 | COD Cr | mg/L | 120 | 4 | Colourity | ? | 80 |
| 2 | SS | mg/L | 120 | 5 | Ca | mg/L | 200 |
| 3 | Specific conductivity | μS/cm | 1500 | 6 | Hardness | mmol/L | 1.2 |
(1) chemical decalcification
Papermaking deep is handled waste water and is flowed into coagulation basin through pipeline, under agitation adds an amount of saturated lime solution adjust pH to 9 earlier by chemicals dosing plant in coagulation basin, adds the Na of 500mg/L again
2CO
3, add the FeSO of 8mg/L then
4, add Na again
2CO
3Anti-adjust pH to 8.5, the polyphenyl alkene acid amides (PAM) that adds 3mg/L at last, enter tube settler after reacting completely, carry out precipitate and separate, thereby remove calcium magnesium, reduction water hardness in the papermaking deep processing waste water, throw out (being mud) is sent in the sludge sump through pump and pipeline, carries out filtering separation at last in sludge dehydration device, and recovery lime carbonate, waste water then enters next step and filters;
(2) filter
Waste water after the chemical decalcification is pumped into more medium filter carry out filtering separation, further remove SS and colloid in anhydrating;
(3) electrolysis
Waste water after filtering is pumped into the electrolysis machine electrolysis, and the degraded organic macromolecule removes colourity, and improves the biodegradability of waste water, and adjacent two interelectrode voltages of electrolysis machine are 12V, and current density is 200mA/cm
2
(4) BAF biochemistry
Waste water after the electrolysis enters BAF, by the oxidation degradation effect waste water is carried out fast purification, obtains papermaking and purifies liquid waste;
(5) ultrafiltration
The biochemical gained papermaking of BAF purified liquid waste carry out the tubular type ultra-filtration filters, separate dialysis water and condensed water, dialysis water enters reverse-osmosis treated, condensed water is back to recycle in step (2) electrolysis machine through pipeline;
(6) reverse osmosis
Ultrafiltration gained dialysis water filters the back through security personnel and pumps into osmosis filtration film system with high-pressure pump, through reverse osmosis membrane filtration separate dialysis water and condensed water, the water of dialysing enters basin and gets reuse water; A condensed water part is separated the redundance discharging through the reflux membrane filtration that circulates of condensed water topping-up pump.
Described tubular type ultrafiltration working conditions is: normal temperature～45 ℃, and operating pressure is 3～300kPa; The membrane module of described reverse osmosis is a rolled membrane module, and mould material is a composite membrane, and entrance pressure can be 6.0～45.0bar, goes out to press to can be 4.5～33.5 bar.
Above-mentioned ultrafiltration is the tubular type ultrafiltration.Ultrafiltration can be a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration or plate-type hyperfiltration.
The reuse water water-quality guideline is as shown in table 6 after measured.
The water-quality guideline of table 6 reuse water
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | Measured value |
| 1 | COD Cr | mg/L | 8 | 4 | Colourity | ? | 6 |
| 2 | SS | mg/L | ≤1 | 5 | Ca | mg/L | ≤1 |
| 3 | Specific conductivity | μS/cm | 60 | 6 | Hardness | mmol/L | 0.06 |
Above-mentioned only is the specific embodiment of the present invention, but design concept of the present invention is not limited thereto, and allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should belong to the behavior of invading protection domain of the present invention.
Claims (5)
1. a papermaking deep is handled the recycling utilization method of waste water, and it may further comprise the steps:
(1) chemical decalcification
Second pond water outlet after the papermaking biochemical treatment (being that papermaking deep is handled waste water) flows into coagulation basin through pipeline, under agitation adds an amount of lime saturated solution adjust pH to 8.5～9.5 earlier by chemicals dosing plant in coagulation basin, adds the Na of 300 ~ 600mg/L again
2CO
3, add the FeSO of 5 ~ 10mg/L then
4, add Na again
2CO
3Anti-adjust pH to 8～9, the polyphenyl alkene acid amides (PAM) that adds 2 ~ 3mg/L at last, enter tube settler after reacting completely, carry out precipitate and separate, thereby remove calcium magnesium, reduction water hardness in the papermaking deep processing waste water, throw out (being mud) is sent in the sludge sump through pump and pipeline, carries out filtering separation at last in sludge dehydration device, and recovery lime carbonate, waste water then enters next step and filters;
(2) filter
Waste water after the chemical decalcification is pumped into more medium filter or filtering separation is carried out in sand filtration, further remove SS and colloid in anhydrating;
(3) electrolysis
Waste water after filtering is pumped into the electrolysis machine electrolysis, and the degraded organic macromolecule removes colourity, improves the biodegradability of waste water, and adjacent two interelectrode voltages of electrolysis machine are 2～12V, and current density is 10～320mA/cm
2
(4) BAF biochemistry
Waste water after the electrolysis enters BAF, by the oxidation degradation effect waste water is carried out fast purification, obtains papermaking and purifies liquid waste;
(5) ultrafiltration
The biochemical gained papermaking of BAF purified liquid waste carry out ultra-filtration filters, separate dialysis water and condensed water, dialysis water enters reverse-osmosis treated, condensed water is back to recycle in the electrolysis machine of step (2) through pipeline;
(6) reverse osmosis
Ultrafiltration gained dialysis water filters the back through security personnel and pumps into osmosis filtration film system with high-pressure pump, through reverse osmosis membrane filtration separate dialysis water and condensed water, the water of dialysing enters basin and gets reuse water; A condensed water part is separated the redundance discharging through the reflux membrane filtration that circulates of condensed water topping-up pump.
2. a kind of papermaking deep as claimed in claim 1 is handled the recycling utilization method of waste water, it is characterized in that: electrolysis machine is provided with power supply and electrolyzer described in the step (3), and the electrode materials in the described electrolyzer is a kind of in graphite, titanium, iron, aluminium, zinc, copper, lead, nickel, molybdenum, chromium, alloy and the nano-catalytic inert material.
3. a kind of papermaking deep as claimed in claim 2 is handled the recycling utilization method of waste water, it is characterized in that: the top layer of described nano-catalytic noble electrode is coated with the metal oxide inertia catalyst coatings that crystal grain is 10～35nm, and the substrate of described nano-catalytic noble electrode is titanium plate or plastic plate.
4. a kind of papermaking deep according to claim 1 is handled the recycling utilization method of waste water, it is characterized in that: the molecular weight cut-off of the described ultrafiltration of step (5) is 1000～50000MWCO, working conditions is normal temperature～45 ℃, described ultrafiltration is a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration or plate-type hyperfiltration, the operating pressure of immersion ultrafiltration is-1～-50kPa, and the operating pressure of pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration and plate-type hyperfiltration is 3～300kPa.
5. a kind of papermaking deep according to claim 1 is handled the recycling utilization method of waste water, it is characterized in that: the reverse osmosis membrane assembly in the described reverse osmosis of step (6) is a rolled membrane module, mould material is cellulose acetate film or a composite membrane in the organic membrane, the molecular weight cut-off of mould material is 50～200MWCO, entrance pressure can be 6.0～35.0bar, goes out to press to can be 4.5～33.5 bar.
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| PCT/CN2014/077819 WO2014187296A1 (en) | 2013-05-19 | 2014-05-19 | Regenerating and recycling apparatus and method for advanced treatment papermaking wastewater |
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