CN203319801U - Papermaking advanced treatment wastewater reusing device based on chemical decalcification - Google Patents
Papermaking advanced treatment wastewater reusing device based on chemical decalcification Download PDFInfo
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- CN203319801U CN203319801U CN201320339509XU CN201320339509U CN203319801U CN 203319801 U CN203319801 U CN 203319801U CN 201320339509X U CN201320339509X U CN 201320339509XU CN 201320339509 U CN201320339509 U CN 201320339509U CN 203319801 U CN203319801 U CN 203319801U
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Abstract
The utility model discloses a papermaking advanced treatment wastewater reusing device based on chemical decalcification, which comprises a chemical decalcification system, a filtering system, an electrolysis system, a membrane separation system and a desalting system, wherein the chemical decalcification system is provided with a dosing system; and the membrane separation system is an ultrafiltration system or an MBR (membrane bioreactor) system. According to the device disclosed by the utility model, by combining a chemical decalcification technology, an electrochemical technology and a membrane technology, after the papermaking advanced treatment wastewater is treated, 70-85% of the wastewater can be regenerated and recycled, thereby reducing wastewater discharge, avoiding environmental pollution caused by the wastewater and reducing the waste of water resources; and moreover, the cost of the regenerated circulating water is lower than the price of tap water, thereby being economical and reasonable, bringing relatively good economic benefits, remarkably reducing the water consumption index and wastewater discharge index for each ton of paper and increasing the economic and technical indexes of an enterprise.
Description
Technical field
The utility model relates to the treatment unit that a kind of papermaking deep is processed waste water, particularly relates to the reclamation set that a kind of papermaking deep based on chemical decalcification technology, electrochemical techniques and membrane technique is processed waste water.
Background technology
Paper-making effluent refers to the cooking waste liquor (claiming again black liquor, red liquid) that chemical pulping produces, the plain boiled water produced in the middle section water produced in the pulp washing bleaching process and copy paper operation.General every production 1t sulfate pulp just has 1t organism and 400kg bases, sulfide to be dissolved in black liquor; Producing the 1t sulfite pulp approximately has 900kg organism and 200kg oxide compound (calcium, magnesium etc.) to be dissolved in red liquid with sulfide.Waste liquid enters in 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, is also one of important source of pollution that cause water to pollute.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, is also the matter of utmost importance that national trade effluent carries out processing up to standard and water saving.According to statistics, the above papermaking in China county and county and paper products industry wastewater discharge account for 18.6% of national industrial total release, wherein process the emission compliance amount and account for 49.3% of paper-making industrial waste water total release, in waste discharge, COD accounts for 44.0% of national industrial COD total release.Therefore, how eliminating that paper waste pollutes and make precious resources in 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, although paper and paperboard production increase year by year, the COD in waste discharge is reduced year by year but.But the waste water that at present paper industry accounts for total emission volumn 50% not yet carries out processing up to standard, paper waste process after recycling few especially, therefore, 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 adopts alkaline process and produces black liquor.In black liquor, contained pollutent has accounted for more than 90% of industrial pollution caused by paper manufacturing total emission volumn, and has the characteristic of high density and difficult degradation, and its improvement is a great problem always.Main component in black liquor has 3 kinds, i.e. xylogen, poly-pentose and total alkali.Xylogen is the nontoxic natural high molecular substance of a class, as industrial chemicals, has purposes widely, and poly-pentose can be used as animal feed.
2, middle section water
Effluent refers to the waste water that the boiling slurry after black liquid extraction is discharged in the processes such as screening, washing, bleaching, and color is deep yellow, accounts for 8%～9% of industrial pollution caused by paper manufacturing total emission volumn, ton slurry COD load 310kg left and right.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 poor, and organism is difficult to biological degradation and intractability is large.Organism in middle section water is mainly xylogen, Mierocrystalline cellulose, organic acid etc., take solubility COD as main.Wherein, what environmental pollution was the most serious is the chlorine-contained wastewater produced in bleaching process, such as Chlorinated Bleaching waste water, hypo(chlorite)bleaching waste water etc.Hypo(chlorite)bleaching waste water mainly, containing trichloromethane, also contains other organic chlorides of kind more than 40, wherein take various chlorinated phenols as at most, as dichloro-phenol, three chlorinated phenols etc.In addition, containing toxic extremely strong carcinogenic substance Dioxins, ecotope and HUMAN HEALTH have been caused to serious threat in bleaching waste liquor.
3, plain boiled water
Plain boiled water is copy paper workshop 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 added, Wet Strength Resin, sanitas etc., take insoluble COD as main, and biodegradability is lower, and its sanitas added has certain toxicity.The plain boiled water water yield is larger, 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 discharge.
At present, the method for processing for paper waste mainly contains: physical filtering method, coagulant sedimentation, absorption method, advanced oxidation processes, By Bubble-floating Method, acid adding 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 process waste water, several method is combined with, typical production technique is through physical treatment such as filtrations grade, then through qualified discharge after biochemical treatment again after flocculation sediment by paper waste.
Chinese patent CN101708927A discloses a kind of advanced treatment method for papermaking waste water of investing little, that technique is simple, pollutants removal rate is high, working cost is cheap oxidative degradation+flocculation sediment+sand filtration.COD<70mg/L after the method is processed, BOD5<20mg/L, SS<30mg/L.
Ecological Disposal and resource recycling that Chinese patent CN1420091 discloses a kind of paper waste utilize method, and it is to utilize ecological engineering technology, and paper mill wastewater carries out BOD in settling tank
5: COD
CrThe ratio adjustment, then enter the digestion of series connection anaerobic pond and facultative lagoon, 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 Sewage Water Emissions, can stay through the storage of the aerobic pool, supplement the required clear water of equalizing tank, is back to the rainwash wetland and carries out the degree of depth and process.The method has overcome paper waste trophic structure imbalance, the poor shortcoming of biodegradability, can stablize the Ecological Disposal and the resource recycling utilization that effectively realize paper waste.
Chinese patent CN101337752 discloses a kind of advanced treatment process for paper-making waste water, this technique comprises the following steps: the paper waste after secondary biochemical treatment is introduced to micro-aeration iron reduction bed, load iron filings in micro-aeration iron reduction bed, paper waste carries out reduction reaction in micro-aeration iron reduction bed; Water outlet after 1. step is processed is introduced in coagulation basin, adds coagulating agent and coagulant aids in coagulation basin, impels the particle aggregation in water; Water outlet after 2. step is processed is introduced in settling tank and is carried out mud-water separation; The water outlet of settling tank is introduced in filtering basin and filtered, and the water outlet after filtration, after sterilization and disinfection, is introduced the reuse water pipe network; Mud in settling tank and the sewage backwash water in filtering basin are introduced to sludge thickener, and after dehydration, outward transport is disposed; Simultaneously, the overflowing liquid in dehydration filtrate and sludge thickener is introduced in coagulation basin and is processed.This utility model technique is simple, good decolorizing effect and with low cost.
Above method all obtains reasonable effect to the processing of paper waste, but all exist the processing degree of depth inadequate, the middle water of producing also contains more pollutent, can only be applicable to some production technique not high to the water specification of quality, and its purposes consumption all is restricted.Make paper waste regeneration, meet the water requirement of various processes, the particularly requirement of high quality water, must carry out the deep purifying processing to it, as the waste water by biochemical gained, through further purifying again and process through membrane filtration, obtain pure water.Chinese patent 201010567041.0,201020635352.1 has been introduced papermaking deep and has been processed the method that waste water employing membrane filtration carries out recycling utilization, but in implementation process, find in paper waste that calcium ion content is up to 150～400 mg/L, produce a large amount of foulings, the regeneration of waste water is caused to serious difficulty.
The utility model content
Waste water after the purpose of this utility model is in existing paper waste treatment process, existing cost is higher, usefulness is lower, processes mostly is discharge, there is no the 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 processed the reclamation set of waste water.
Papermaking deep based on chemical decalcification described in the utility model is processed wastewater recycling device and is provided with chemical decalcification system, filtering system, electrolytic system, film separating system, desalination system.
The chemistry decalcification system is processed calcium magnesium, the reduction water hardness of waste water for removing papermaking deep, the chemistry decalcification system comprises one-level decalcification reaction tank, stopping valve, secondary decalcification reaction tank and settling tank, one-level decalcification reaction tank connects with the import of stopping valve, the outlet of stopping valve connects the import of secondary decalcification reaction tank, the outlet of secondary decalcification reaction tank connects with the import of stopping valve, the outlet of stopping valve connects with the import of settling tank, and the import of filter system is taken in the outlet of settling tank.
One-level decalcification reaction tank in described chemical decalcification system and secondary decalcification reaction tank also are furnished with medicine system, medicine system is provided with grug feeding jar and dosing pump, the grug feeding jar outlet connects the import of dosing pump, and the dosing pump outlet connects the import of one-level decalcification reaction tank or secondary decalcification reaction tank.
Filtering system is for carrying out filtering separation by the waste water after chemical decalcification, filtering system comprises stopping valve, working shaft, strainer, backwashing pump and cleaning fluid tank, the import of stopping valve connects the outlet of chemical decalcification system, the import of working shaft connects the outlet of stopping valve, the water supply pump outlet is taken over the import of filter, outlet one tunnel of strainer connects with electrolytic system, and another road connects cleaning fluid tank through backwashing pump successively.
Filtration in described filtering system is a kind of in multi-medium filtering, fabric filter element, sand filtration, active sand filtration, filtering cloth filtering pool.
Electrolytic system is for carrying out electrolysis treatment to the water outlet after filtering separation, electrolytic system is provided with stopping valve, working shaft and electrolysis machine, the external filtering system outlet of the import of stopping valve, the import of working shaft connects the outlet of stopping valve, the water supply pump outlet connects the import of electrolysis machine, and the outlet of electrolysis machine connects with the import of film separating system.
In described electrolytic system, electrolysis machine is provided with power supply and electrolyzer, electrode in described electrolyzer is a kind of in graphite, titanium, iron, aluminium, zinc, copper, lead, nickel, molybdenum, chromium, alloy and nano-catalytic noble electrode, 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.
Film separating system is removed the particle in waste water and macromolecular colloid, microorganism fast by the centrifugation of film, obtains papermaking and purifies liquid waste.
Described film separating system can be in ultrafiltration and MBR a kind of.
Described ultrafiltration system is provided with stopping valve, working shaft, ultrafiltration membrane system, backwashing pump, water-dialyzing basin and valve, the import of stopping valve connects the outlet of electrolysis machine, the outlet of stopping valve connects the import of working shaft, the water-dialyzing that the water supply pump outlet connects outlet, the ultrafiltration membrane system of ultrafiltration membrane system exports a road and connects the water-dialyzing basin, another road connects the water-dialyzing basin through backwashing pump, the condensed water of ultrafiltration membrane system through pipeline and valve return to recycle in electrolytic system; Described ultrafiltration system molecular weight cut-off is 1000～100000MWCO, working conditions is: normal temperature～45 ℃, ultrafiltration system is a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, spiral wound or plate-type hyperfiltration, the operating pressure of immersion ultrafiltration is-1～-50kPa, the operating pressure of pillar ultrafiltration, tubular type ultrafiltration, spiral wound and plate-type hyperfiltration is 3～300kPa.
Described MBR system is provided with stopping valve, the MBR reaction tank, the MBR membrane module, gas blower, aerator, residual sea water pump, go out water pump, elementary reuse water basin, the electrolytic system gained is purified waste water and is connect the import of MBR reaction tank by water inlet pipe through stopping valve, the MBR membrane module is immersed in the MBR reaction tank, aerator by gas blower and distribution carries out aeration to it, the outlet of MBR reaction tank picks out the import of water pump, the filtrate (water) produced is collected the high-purity regenerated water of elementary reuse water basin for further utilizing for the production cocycle through the desalination system desalination, a small amount of mud is through residual sea water pump suction discharge, the membrane module of described MBR system is selected from a kind of in Pvdf Microporous Hollow Fiber Membrane, polypropylene hollow fiber membrane, ps hollow fiber uf membrane, polyether sulphone hollow fibre film, polyacrylonitrile hollow fiber membrane and PVC hollow fiber membrane, the membrane pore size of the MBR membrane module of described MBR system is 0.10～0.2 μ m, operating pressure is-1～-50kPa, working temperature is 5～45 ℃.
Described ultrafiltration system or MBR system also comprise chemical cleaning system, chemical cleaning system is for cleaning the membrane module of ultrafiltration or MBR system, chemical cleaning system is provided with cleaning fluid tank, chemical cleaning pump and stopping valve, the outlet of cleaning fluid tank connects the import of chemical cleaning pump, and the matting pump outlet connects ultra-filtration membrane or MBR system through stopping valve.
Desalination system is by film separating system gained water-dialyzing through separating to obtain water-dialyzing and condensed water through desalination system, water-dialyzing enters basin and obtains reuse water, and condensed water is back to electrolytic system, the redundance discharge.Described desalination system is provided with stopping valve, working shaft, desalting plant, reuse water basin, stopping valve, the import of stopping valve connects the outlet of film separating system, the water-dialyzing outlet that the outlet of stopping valve connects the import of working shaft, import that the water supply pump outlet connects desalting plant, desalting plant connects stopping valve and reuse water basin successively, and the condensed water outlet of desalting plant flow to electrolytic system through stopping valve.
Described desalination system is nanofiltration, reverse osmosis, just infiltration, electrodialysis, capacitive adsorption, ion-exchange or fills a kind of of electrodialysis (EDI).
Nanofiltration membrane component in described nanofiltration is a kind of of tubular membrane component, rolled membrane module or plate film assembly, and operating pressure is 6～45bar, and working temperature is 20～45 ℃, and optimum temps is 35～40 ℃.
The reverse osmosis membrane assembly of described reverse osmosis is rolled membrane module, and mould material is cellulose acetate film or composite membrane in organic membrane, and the molecular weight cut-off of mould material is 50～200MWCO, and entrance pressure can be 6.0～45.0bar, goes out to press to can be 4.5～33.5 bar.
The described membrane module just permeated is a kind of in plate and frame module, rolled membrane module, tubular membrane component and packet mode membrane module.
Described electrodialytic working conditions is operating voltage pressure 0.5～3.0 ㎏/cm
2, operating voltage 50～250V, strength of current 1～3A.
The working conditions of described capacitive adsorption is that volts DS is 110V/m ~ 2 * 10
6V/m.
The ion-exchanger that described ion-exchange is used is divided into inorganic ion exchanger and the large class of organic ion exchanger two, inorganic ion exchanger has natural zeolite and synthetic zeolite etc., and organic exchange resin is a kind of in strong-acid cation-exchange resin, weakly acidic cationic exchanger resin, strong anion-exchange resin, weak basic anion exchange resin, resin and organic polymeric adsorbent etc.
Described filling electrodialysis (EDI) is a kind of separating desalination technique that electrodialysis and ion-exchange are organically combined, fill the electrodialysis unit water inlet require for resistivity be 0.025～0.5M Ω cm.
The technical solution of the utility model is: papermaking deep is processed waste water → chemical decalcification → filtration → electrolysis → membrane sepn (ultrafiltration/MBR) → desalination system → reuse water.
The utility model had both overcome the defect of alone membrane filtration separating treatment or adsorption treatment high cost, the treatment effect that has overcome again conventional paper waste method is undesirable, the defects such as contaminated wastewater environment of discharge, process purification of waste water and recycle and reuse by existing papermaking deep.Compared with the prior art, there is following outstanding advantages:
(1) papermaking deep is processed waste water through processing, and 70%～85% can recycling utilization, has both reduced discharge of wastewater, avoid the waste water environmental pollution, reduce again water resource waste, can also make the recirculated water cost of regeneration lower than the tap water price, economical rationality, produce economic benefit preferably.
(2) after the reaction of the one-level decalcification by chemical decalcification system removes false hardness (supercarbonate), then make carbonate react the generation carbonate deposition with calcium ions and magnesium ions through secondary decalcification reaction tank, then with FeSO
4Flocculate mutually with coagulant aidss such as polyphenyl alkene acid amides (PAM), be gathered into thick alumina blossom particles, settle down in settling tank, final effective elimination papermaking deep is processed high-concentration Ca, the magnesium ion in waste water, reduce water hardness, prevent equipment scaling, guarantee that subsequent technique is smooth, steady running.
(3) further reduce COD by the nano-catalytic electrolysis, the one, can make the reclamation rate of waste water improve, both reduced discharge of wastewater, avoid the waste water environmental pollution, reduce again water resource waste; The 2nd, can kill the microorganisms such as bacterium in waste water, eradicate the biological pollution of follow-up nanofiltration membrane and reverse osmosis membrane, significantly reduce the wash number of nanofiltration membrane and reverse osmosis membrane, reduce the clean regeneration cost of film, improve the service efficiency of film, extend the work-ing life of film, reduce the film replacement cost.
(4) after film separating system is processed, particle and macromolecular colloid compound in waste water are further removed, for follow-up technique is created good condition of water quality, oxygenolysis by microorganism in the MBR system will further decompose pollutant in water simultaneously, utilize the efficient rejection effect of film, the indexs such as SS, colourity, pollutent are effectively removed.
(5) the water consumption index of decrease ton paper and discharge of wastewater index, improve the business economic technical indicator.
The alleged papermaking deep of the utility model is processed waste water and is referred to paper waste second pond water outlet after traditional filtration, flocculation treatment, reaches the waste water of emission standard more than three grades.
The accompanying drawing explanation
Fig. 1 is that the papermaking deep of the utility model based on chemical decalcification processed the structural representation that the wastewater recycling device membrane sepn adopts ultrafiltration system;
Fig. 2 is that the papermaking deep of the utility model based on chemical decalcification processed the structural representation that the wastewater recycling device membrane sepn adopts the MBR system;
The structural representation of Fig. 3 the utility model medicine system.
Embodiment
The utility model be after composition, character and the existing processing scheme of existing papermaking deep being processed to waste water are goed deep into the comparative study of system, complete to the purification of papermaking deep processed waste water and the design of reclamation set, it is comprised of chemical decalcification system, filtering system, electrolytic system, film separating system and desalination system.
Following embodiment is further described the utility model in connection with accompanying drawing.
Referring to Fig. 1 and Fig. 2, the papermaking deep based on chemical decalcification described in the utility model is processed wastewater recycling device and is comprised:
The chemistry decalcification system: chemical decalcification system is processed calcium magnesium, the reduction water hardness of waste water for removing papermaking deep, the chemistry decalcification system is provided with one-level decalcification reaction tank 11, stopping valve 12, secondary decalcification reaction tank 13, stopping valve 14, settling tank 15, one-level decalcification reaction tank 11 connects with the import of stopping valve 12, the outlet of stopping valve 12 connects the import of secondary decalcification reaction tank 13, the outlet of secondary decalcification reaction tank 13 connects with the import of stopping valve 14, the outlet of stopping valve 14 connects with the import of settling tank 15, and the import of filter system is taken in the outlet of settling tank 15.
Medicine system: with reference to Fig. 3, medicine system is for adding decalcifying agent and coagulating agent to waste water, and medicine system is provided with lime grug feeding jar 16, dosing pump 161, Na
2CO
3Grug feeding jar 17, dosing pump 171, FeSO
4Grug feeding jar 18, dosing pump 181, PAM grug feeding jar 19, dosing pump 191; The outlet of lime grug feeding jar 16 connects the import of dosing pump 161, and the outlet of dosing pump 161 connects the import of one-level decalcification reaction tank 11; Na
2CO
3The outlet of grug feeding jar 17 connects the import of dosing pump 171, and the outlet of dosing pump 171 connects the import of secondary decalcification reaction tank 13; FeSO
4The outlet of grug feeding jar 18 connects the import of dosing pump 181, and the outlet of dosing pump 181 connects the import of secondary decalcification reaction tank 13; The outlet of PAM grug feeding jar 19 connects the import of dosing pump 191, and the outlet of dosing pump 191 connects the import of secondary decalcification reaction tank 13.
Filtering system: filtering system is for carrying out filtering separation by the waste water after chemical decalcification, and filtering system is provided with stopping valve 21, working shaft 22, strainer 23, stopping valve 24, backwashing pump 25 and cleaning fluid tank 26; The import of stopping valve 21 connects the outlet of chemical decalcification system, the import of working shaft 22 connects the outlet of stopping valve 21, the import of filter 23 is taken in the outlet of working shaft 22, and outlet one tunnel of strainer 23 connects with electrolytic system, and another road connects cleaning fluid tank 26 through backwashing pump 25 successively.
Electrolytic system: electrolytic system is for carrying out electrolysis treatment to the water outlet after filtering separation, and electrolytic system is provided with stopping valve 31, working shaft 32 and electrolysis machine 33; The external filtering system relief outlet of the import of stopping valve 31, the import of working shaft 32 connects the outlet of stopping valve 31, and the outlet of working shaft 32 connects the import of electrolysis machine 33, and the outlet of electrolysis machine 33 connects with the import of film separating system.
Film separating system: film separating system, for by the centrifugation of film, particle and macromolecular colloid, the microorganism of waste water being removed fast, obtains papermaking and purifies liquid waste.Film separating system can be in ultrafiltration and MBR a kind of.
With reference to Fig. 1, ultrafiltration system is provided with stopping valve 41, working shaft 42, ultrafiltration membrane system 43, backwashing pump 44, stopping valve 45, water-dialyzing basin 46 and valve 47, the import of stopping valve 41 connects the outlet of electrolysis machine 33, the outlet of stopping valve 41 connects the import of working shaft 42, the outlet of working shaft 42 connects the outlet of ultrafiltration membrane system 43, the water-dialyzing outlet of ultrafiltration membrane system 43 connects water-dialyzing basin 46 through backwashing pump 44, stopping valve 45 successively, and the condensed water of ultrafiltration membrane system 43 is back in electrolytic system and reuses through valve 47.
With reference to Fig. 2, the MBR system, be provided with stopping valve 41, MBR membrane module 42, gas blower 43, aerator 44, MBR reaction tank 45, residual sea water pump 46, go out water pump 47 and elementary reuse water basin 48.The import of stopping valve 41 connects the outlet of electrolysis machine 33, the outlet of stopping valve 41 successively through MBR reaction tank 45, go out water pump 47 and enter elementary reuse water basin 48.
Ultrafiltration or MBR chemical cleaning system: chemical cleaning system is for cleaning ultrafiltration or MBR system, chemical cleaning system is provided with cleaning fluid tank 51, chemical cleaning pump 52 and stopping valve 53, the outlet of cleaning fluid tank 51 connects the import of chemical cleaning pump 52, and the outlet of chemical cleaning pump 52 connects ultrafiltration or MBR system through stopping valve 53.
Desalination system: desalination system pumps into desalination system by film separating system gained water-dialyzing with pump, through desalination system, separates to obtain water-dialyzing and condensed water, and water-dialyzing enters basin and obtains reuse water; A condensed water part is back to electrolytic system, the redundance discharge.Described desalination system can be nanofiltration, reverse osmosis, just infiltration, electrodialysis, capacitive adsorption, ion-exchange or fill a kind of of electrodialysis (EDI).
Desalination system is provided with stopping valve 61, working shaft 62, desalting plant 63, stopping valve 64, reuse water basin 65, stopping valve 66.The import of stopping valve 61 connects the outlet of film separating system water-dialyzing basin, the outlet of stopping valve 61 is successively through working shaft 62, desalting plant 63, the water-dialyzing outlet of desalting plant 63 connects the import of reuse water basin 65 through stopping valve 64, the backflow condensed water outlet of desalting plant 63 is back to electrolytic system through stopping valve 66.
Provide below in conjunction with Fig. 1, Fig. 2 and Fig. 3 the specific embodiment that papermaking deep based on chemical decalcification is processed wastewater recycling device.
Embodiment 1
800 ton per day papermaking deeps are processed the reuse method of waste water.
It is as shown in table 1 after measured that described papermaking deep is processed the waste water quality index.
Table 1 papermaking deep is processed 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 | 100 | |
| 2 | SS | mg/L | 120 | 5 | Ca | mg/L | 400 |
| 3 | Specific conductivity | μS/cm | 1600 | 6 | Hardness | mmol/L | 9.9 |
(1) chemical decalcification
Second pond water outlet after the papermaking biochemical treatment (being that papermaking deep is processed waste water) flows into one-level decalcification reaction tank 11 through pipeline, under agitation first add appropriate lime saturated solution adjust pH to 8.5 by chemicals dosing plant, after removing false hardness (supercarbonate), flow into secondary decalcification reaction tank 13, add the Na of 600mg/L
2CO
3, carbonate is reacted with calcium ions and magnesium ions and generate carbonate deposition, then add the FeSO of 5mg/L
4, then add Na
2CO
3Anti-adjust pH to 8.5, finally add the polyphenyl alkene acid amides (PAM) of 1mg/L, enters settling tank 15 after reacting completely, and carries out precipitate and separate, thereby remove papermaking deep, processes calcium magnesium in waste water, reduces water hardness, prevents that follow-up equipment, facility are because Ca
2+Excessive concentration and fouling; Throw out (being mud) is sent in sludge sump through pump and pipeline, finally in sludge dehydration device, carries out filtering separation, and reclaims calcium carbonate, and waste water enters next step and filters;
(2) filter
Waste water after chemical decalcification is pumped into to filtering system and carry out filtering separation, further except SS and colloid in anhydrating;
The above-mentioned multi-medium filtering that is filtered into.Filtration can be a kind of in multi-medium filtering, fabric filter element, sand filtration, active sand filtration, filtering cloth filtering pool.
(3) electrolysis
Waste water after filtering is pumped into to electrolysis machine 33 electrolysis, with the degraded organic macromolecule, remove colourity, improve the biodegradability of waste water, adjacent two interelectrode voltages of electrolysis machine 33 are 2V, and current density is 200mA/cm
2
(4) membrane sepn
Waste water after electrolysis enters film separating system, remove particle, macromolecular colloid compound and the microorganism in waste water by the membrane sepn effect, obtain water-dialyzing and condensed water, water-dialyzing enters the desalting treatment system, and condensed water flow to recycle in the electrolysis machine 33 of step (3) through back of pipeline;
Described film separating system is the MBR system.The membrane module of MBR system is selected from a kind of in Pvdf Microporous Hollow Fiber Membrane, polypropylene hollow fiber membrane, ps hollow fiber uf membrane, polyether sulphone hollow fibre film, polyacrylonitrile hollow fiber membrane and PVC hollow fiber membrane; The membrane pore size of MBR membrane module is 0.10～0.2 μ m, operating pressure is-1～-50kPa, working temperature is 5～45 ℃.
(5) desalination system
Membrane sepn gained water-dialyzing pumps into desalination system with pump, through the desalination system filtering separation, obtains water-dialyzing and condensed water, and water-dialyzing enters basin and obtains reuse water; A condensed water part is back to electrolytic system, the redundance discharge.
Described desalination system is reverse osmosis system.Reverse osmosis membrane system adopts molecular weight cut-off to can be the reverse osmosis membrane of 50～200MWCO, and membrane module is tubular membrane component or rolled membrane module, and entrance pressure can be 6.0～35.0bar, goes out to press to can be 4.5～33.5 bar.
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 | 8 | 4 | Colourity | 8 | |
| 2 | SS | mg/L | ≤1 | 5 | Ca | mg/L | 45 |
| 3 | Specific conductivity | μS/cm | 80 | 6 | Hardness | mmol/L | 1.1 |
Embodiment 2
5000 ton per day papermaking deeps are processed the reuse method of waste water.
It is as shown in table 3 after measured that described papermaking deep is processed the waste water quality index.
Table 3 papermaking deep is processed the water-quality guideline of waste water
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | Measured value |
| 1 | COD Cr | mg/L | 100 | 4 | Colourity | 150 | |
| 2 | SS | mg/L | 120 | 5 | Ca | mg/L | 150 |
| 3 | Specific conductivity | μS/cm | 1800 | 6 | Hardness | mmol/L | 4 |
(1) chemical decalcification
Second pond water outlet after the papermaking biochemical treatment (being that papermaking deep is processed waste water) flows into one-level decalcification reaction tank 11 through pipeline, under agitation first add appropriate lime saturated solution adjust pH to 9 by chemicals dosing plant, after removing false hardness (supercarbonate), flow into secondary decalcification reaction tank 13, add the Na of 100mg/L
2CO
3, carbonate is reacted with calcium ions and magnesium ions and generate carbonate deposition, then add the FeSO of 2mg/L
4, then add Na
2CO
3Anti-adjust pH to 8, finally add the polyphenyl alkene acid amides (PAM) of 3mg/L, enters settling tank 15 after reacting completely, and carries out precipitate and separate, thereby remove papermaking deep, processes calcium magnesium in waste water, reduces water hardness, prevents that follow-up equipment, facility are because Ca
2+Excessive concentration and fouling; Throw out (being mud) is sent in sludge sump through pump and pipeline, finally in sludge dehydration device, carries out filtering separation, and reclaims calcium carbonate, and waste water enters next step and filters;
(2) filter
Waste water after chemical decalcification is pumped into to filtering system and carry out filtering separation, further except SS and colloid in anhydrating;
The above-mentioned multi-medium filtering that is filtered into.Filtration can be a kind of in multi-medium filtering, fabric filter element, sand filtration, active sand filtration, filtering cloth filtering pool.
(3) electrolysis
Waste water after filtering is pumped into to electrolysis machine 33 electrolysis, with the degraded organic macromolecule, remove colourity, improve the biodegradability of waste water, adjacent two interelectrode voltages of electrolysis machine 33 are 12V, and current density is 10mA/cm
2
(4) membrane sepn
Waste water after electrolysis enters film separating system, remove particle, macromolecular colloid compound and the microorganism in waste water by the membrane sepn effect, obtain water-dialyzing and condensed water, water-dialyzing enters the desalting treatment system, and condensed water flow to recycle in the electrolysis machine 33 of step (3) through back of pipeline;
Described film separating system is ultrafiltration system, and ultrafiltration is the immersion ultrafiltration, and working conditions is: normal temperature～45 ℃, and operating pressure is-1～-50kPa; Ultrafiltration can be a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, spiral wound or plate-type hyperfiltration.
(5) desalination system
Membrane sepn gained water-dialyzing, through with pump, pumping into desalination system, obtains water-dialyzing and condensed water through the desalination system filtering separation, and water-dialyzing enters basin and obtains reuse water; A condensed water part is back to electrolytic system, the redundance discharge.
Described desalination system is reverse osmosis system.Reverse osmosis membrane system adopts molecular weight cut-off to can be the reverse osmosis membrane of 50～200MWCO, and membrane module is tubular membrane component or rolled membrane module, and entrance pressure can be 6.0～35.0bar, goes out to press to can be 4.5～33.5 bar.
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 | 10 | 4 | Colourity | 5 | |
| 2 | SS | mg/L | ≤1 | 5 | Ca | mg/L | 30 |
| 3 | Specific conductivity | μS/cm | 100 | 6 | Hardness | mmol/L | 0.75 |
Embodiment 3
20000 ton per day papermaking deeps are processed the reuse method of waste water.
It is as shown in table 5 after measured that described papermaking deep is processed the waste water quality index.
Table 5 papermaking deep is processed 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 | 120 | |
| 2 | SS | mg/L | 80 | 5 | Ca | mg/L | 200 |
| 3 | Specific conductivity | μS/cm | 1200 | 6 | Hardness | mmol/L | 5 |
(1) chemical decalcification
Second pond water outlet after the papermaking biochemical treatment (being that papermaking deep is processed waste water) flows into one-level decalcification reaction tank 11 through pipeline, under agitation first add appropriate lime saturated solution adjust pH to 9.5 by chemicals dosing plant, after removing false hardness (supercarbonate), flow into secondary decalcification reaction tank 13, add the Na of 350mg/L
2CO
3, carbonate is reacted with calcium ions and magnesium ions and generate carbonate deposition, then add the FeSO of 10mg/L
4, then add Na
2CO
3Anti-adjust pH to 9, finally add the polyphenyl alkene acid amides (PAM) of 2mg/L, enters settling tank 15 after reacting completely, and carries out precipitate and separate, thereby remove papermaking deep, processes calcium magnesium in waste water, reduces water hardness, prevents that follow-up equipment, facility are because Ca
2+Excessive concentration and fouling; Throw out (being mud) is sent in sludge sump through pump and pipeline, finally in sludge dehydration device, carries out filtering separation, and reclaims calcium carbonate, and waste water enters next step and filters;
(2) filter
Waste water after chemical decalcification is pumped into to filtering system and carry out filtering separation, further except SS and colloid in anhydrating;
Above-mentionedly be filtered into active sand filtration.Filtration can be a kind of in multi-medium filtering, fabric filter element, sand filtration, active sand filtration, filtering cloth filtering pool.
(3) electrolysis
Waste water after filtering is pumped into to electrolysis machine 33 electrolysis, with the degraded organic macromolecule, remove colourity, improve the biodegradability of waste water, adjacent two interelectrode voltages of electrolysis machine 33 are 2V, and current density is 320mA/cm
2
(4) membrane sepn
Waste water after electrolysis enters film separating system, remove particle, macromolecular colloid compound and the microorganism in waste water by the membrane sepn effect, obtain water-dialyzing and condensed water, water-dialyzing enters the desalting treatment system, and condensed water flow to recycle in the electrolysis machine 33 of step (3) through back of pipeline;
Described film separating system is the MBR system.The membrane module of MBR system is selected from a kind of in Pvdf Microporous Hollow Fiber Membrane, polypropylene hollow fiber membrane, ps hollow fiber uf membrane, polyether sulphone hollow fibre film, polyacrylonitrile hollow fiber membrane and PVC hollow fiber membrane; The membrane pore size of MBR membrane module is 0.10～0.2 μ m, operating pressure is-1～-50kPa, working temperature is 5～45 ℃.
(5) desalination system
Membrane sepn gained water-dialyzing pumps into desalination system with pump, through the desalination system filtering separation, obtains water-dialyzing and condensed water, and water-dialyzing enters basin and obtains reuse water; A condensed water part is back to electrolytic system, the redundance discharge.
Described desalination system is nanofiltration system.The membrane module of described nanofiltration system is a kind of of tubular membrane component, rolled membrane module or plate film assembly, and operating pressure is 6～45bar, and working temperature is 20～45 ℃, and optimum temps is 35～40 ℃.
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 | 60 |
| 3 | Specific conductivity | μS/cm | 60 | 6 | Hardness | mmol/L | 1.5 |
Claims (11)
1. the papermaking deep based on chemical decalcification is processed wastewater recycling device, it is characterized in that: comprise chemical decalcification system, filtering system, electrolytic system, film separating system and desalination system, described chemical decalcification system comprises one-level decalcification reaction tank, stopping valve, secondary decalcification reaction tank and settling tank, one-level decalcification reaction tank connects with the import of stopping valve, the outlet of stopping valve connects the import of secondary decalcification reaction tank, the outlet of secondary decalcification reaction tank connects with the import of stopping valve, the outlet of stopping valve connects with the import of settling tank, and the import of filter system is taken in the outlet of settling tank, one-level decalcification reaction tank in described chemical decalcification system and secondary decalcification reaction tank also are furnished with medicine system, medicine system is provided with grug feeding jar and dosing pump, the grug feeding jar outlet connects the import of dosing pump, and the dosing pump outlet connects one-level decalcification reaction tank or secondary decalcification reaction tank, described filtering system comprises stopping valve, working shaft, strainer, backwashing pump and cleaning fluid tank, the import of stopping valve connects the outlet of chemical decalcification system, the import of working shaft connects the outlet of stopping valve, the water supply pump outlet is taken over the import of filter, outlet one tunnel of strainer connects with electrolytic system, and another road connects cleaning fluid tank through backwashing pump successively, described electrolytic system comprises stopping valve, working shaft and electrolysis machine, the external filtering system outlet of the import of stopping valve, and the import of working shaft connects the outlet of stopping valve, and the water supply pump outlet connects the import of electrolysis machine, and the outlet of electrolysis machine connects with the import of film separating system, described film separating system is a kind of in ultrafiltration system and MBR system, described ultrafiltration system comprises stopping valve, working shaft, ultrafiltration membrane system, backwashing pump, water-dialyzing basin and valve, the import of stopping valve connects the outlet of electrolysis machine, the outlet of stopping valve connects the import of working shaft, the water supply pump outlet connects the outlet of ultrafiltration membrane system, the water-dialyzing of ultrafiltration membrane system exports a road and connects the water-dialyzing basin, another road connects the water-dialyzing basin through backwashing pump, the condensed water of ultrafiltration membrane system through pipeline and valve return to recycle in electrolytic system, described MBR system comprises stopping valve, the MBR reaction tank, the MBR membrane module, gas blower, aerator, residual sea water pump, go out water pump, elementary reuse water basin, the electrolytic system gained is purified waste water and is connect the import of MBR reaction tank by water inlet pipe through stopping valve, the MBR membrane module is immersed in the MBR reaction tank, aerator by gas blower and distribution carries out aeration to it, the outlet of MBR reaction tank picks out the import of water pump, the filtrate collection produced is the high-purity regenerated water for further utilizing for the production cocycle through the desalting treatment system to elementary reuse water basin, a small amount of mud is through residual sea water pump suction discharge, described ultrafiltration system or MBR system also comprise chemical cleaning system, chemical cleaning system is for cleaning the membrane module of ultrafiltration or MBR system, chemical cleaning system is provided with cleaning fluid tank, chemical cleaning pump and stopping valve, the outlet of cleaning fluid tank connects the import of chemical cleaning pump, and the matting pump outlet connects ultra-filtration membrane or MBR system through stopping valve,
Described desalination system is provided with stopping valve, working shaft, desalting plant and reuse water basin, the import of stopping valve connects the outlet of film separating system, the outlet of stopping valve enters desalting plant through working shaft, the water-dialyzing outlet of desalting plant connects the import of reuse water basin, and the condensed water outlet of desalting plant is back to electrolytic system through stopping valve.
2. papermaking deep based on chemical decalcification according to claim 1 is processed wastewater recycling device, it is characterized in that: described filtering system is a kind of in multi-medium filtering, fabric filter element, sand filtration, active sand filtration, filtering cloth filtering pool system.
3. the papermaking deep based on chemical decalcification as claimed in claim 1 is processed wastewater recycling device, it is characterized in that: in described electrolytic system, electrolysis machine is provided with power supply and electrolyzer, and the electrode in described electrolyzer is a kind of in graphite, titanium, iron, aluminium, zinc, copper, lead, nickel, molybdenum, chromium, alloy and nano-catalytic noble electrode.
4. the papermaking deep based on chemical decalcification as claimed in claim 3 is processed wastewater recycling device, 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.
5. papermaking deep based on chemical decalcification according to claim 1 is processed wastewater recycling device, it is characterized in that: described ultrafiltration system is a kind of in immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, spiral wound or plate-type hyperfiltration.
6. the papermaking deep based on chemical decalcification according to claim 1 is processed wastewater recycling device, it is characterized in that: the membrane module of described MBR system is selected from a kind of in Pvdf Microporous Hollow Fiber Membrane, polypropylene hollow fiber membrane, ps hollow fiber uf membrane, polyether sulphone hollow fibre film, polyacrylonitrile hollow fiber membrane and PVC hollow fiber membrane, and the membrane pore size of the MBR membrane module of described MBR system is 0.10～0.2 μ m.
7. papermaking deep based on chemical decalcification according to claim 1 is processed wastewater recycling device, it is characterized in that: described desalination system is nanofiltration, reverse osmosis, just infiltration, electrodialysis, capacitive adsorption, ion-exchange or fills a kind of in electrodialysis (EDI).
8. the papermaking deep based on chemical decalcification according to claim 7 is processed wastewater recycling device, and it is characterized in that: the nanofiltration membrane component in described nanofiltration system is a kind of of tubular membrane component, rolled membrane module or plate film assembly.
9. the papermaking deep based on chemical decalcification according to claim 7 is processed wastewater recycling device, and it is characterized in that: the reverse osmosis membrane assembly in described reverse osmosis system is rolled membrane module, and mould material is cellulose acetate film or composite membrane in organic membrane.
10. papermaking deep based on chemical decalcification according to claim 7 is processed wastewater recycling device, it is characterized in that: the described membrane module just permeated is a kind of in plate and frame module, rolled membrane module, tubular membrane component and packet mode membrane module.
11. the papermaking deep based on chemical decalcification according to claim 7 is processed wastewater recycling device, it is characterized in that: the ion-exchanger that described ion-exchange is used is divided into inorganic ion exchanger and the large class of organic ion exchanger two, inorganic ion exchanger comprises natural zeolite and synthetic zeolite, and organic exchange resin is a kind of in strong-acid cation-exchange resin, weakly acidic cationic exchanger resin, strong anion-exchange resin, weak basic anion exchange resin, resin and organic polymeric adsorbent.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103253838A (en) * | 2013-06-14 | 2013-08-21 | 波鹰(厦门)科技有限公司 | Recycling device used for papermaking advanced treatment wastewater and based on chemical decalcification |
| WO2014198179A1 (en) * | 2013-06-14 | 2014-12-18 | 波鹰(厦门)科技有限公司 | Chemical decalcification based recycling device and method for advanced treatment of papermaking wastewater |
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2013
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103253838A (en) * | 2013-06-14 | 2013-08-21 | 波鹰(厦门)科技有限公司 | Recycling device used for papermaking advanced treatment wastewater and based on chemical decalcification |
| CN103253838B (en) * | 2013-06-14 | 2014-08-06 | 波鹰(厦门)科技有限公司 | Recycling device used for papermaking advanced treatment wastewater and based on chemical decalcification |
| WO2014198179A1 (en) * | 2013-06-14 | 2014-12-18 | 波鹰(厦门)科技有限公司 | Chemical decalcification based recycling device and method for advanced treatment of papermaking wastewater |
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