CN103757971A - Resource recycling method for pulp and water in residual off-machine water of papermaking workshop - Google Patents
Resource recycling method for pulp and water in residual off-machine water of papermaking workshop Download PDFInfo
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- CN103757971A CN103757971A CN201410023029.1A CN201410023029A CN103757971A CN 103757971 A CN103757971 A CN 103757971A CN 201410023029 A CN201410023029 A CN 201410023029A CN 103757971 A CN103757971 A CN 103757971A
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Abstract
The invention relates to the field of resource utilization technologies for papermaking off-machine water, in particular to a resource recycling method for pulp and water in residual off-machine water of a papermaking workshop. By the aid of the resource recycling method, pretreatment can be omitted, the residual high-concentration and high-temperature off-machine water of the workshop is directly filtered and separated by the aid of silicon carbide films, pulp fibers, packing and macromolecular auxiliaries are retained, and the pulp can be recycled; filtered fluid is low in turbidity and pollutant concentration and can be used as reuse water, and accordingly the purpose of recycling the pulp and the water can be achieved. The resource recycling method has the advantages of capabilities of recycling the pulp and the water from sources and preventing secondary pollution, cleanness, low-carbon property, stability in effect, simplicity in process, low investment and running expenses, small occupied area and flexibility in arrangement.
Description
Affiliated technical field
Patent of the present invention relates to pulping and paper-making cleaner production field, and particularly plain boiled water application technology as the second resource field, is specially the method that the unnecessary plain boiled water resource of a kind of paper machine room reclaims paper pulp and water.
Background technology
Paper industry be technology-intensive a, complex process, consumed resource large, produce the industry that pollutant is many, paper industry is water consumption and blowdown rich and influential family, papermaking enterprise has the water yield to exceed standard and overproof water quality dual-pressure, in today of Environmental Protection Situation increasingly stringent, face increasing cleaner production pressure.Cleaner production is to be conceived to pollution prevention, reduces to greatest extent the consumption of resource and the energy, improves the utilization rate of resource and the energy.Cleaner production is the essential measure that reduces industrial pollution, protection of the environment and resources.On the source of paper technology production process, carrying out cleaner production, thereby realize effective utilization of water saving and water resource, is the treatment technology that first paper-making industrial waste water regeneration will be considered.
Membrane separation technique is the new and high technology of an emerging multidisciplinary intersection, and the application of membrane separation technique relates to industry-by-industry, and applied range, interrelationship between industries are large.With other isolation technics comparisons, it have efficient, energy-conservation, process is easy to control, easy to operate, environmental friendliness, be convenient to amplify, take up an area little, easily and the advantage such as other technologies are integrated.The in the situation that energy shortage in the world today, water resources shortage and environmental pollution being day by day serious, membrane technology more obtains the great attention of countries in the world, has become and has promoted the common technology that national pillar industry develops, improves environment for human survival, improves people's quality of life.
Paper waste membrane treatment process is as a kind of middle water recovering process of brand-new Processing Paper Wastewater, for paper waste is processed and reuse provides solution.Paper waste membrane treatment process is mainly as the advanced treating of paper waste at present, after being generally applied in air supporting, flocculation sediment and biochemical treatment, belong to end treatment, and need the coarse filtrations such as sand filtration, multi-medium filtering to filter as security personnel, whole handling process is long, investment is large, operating cost is high, operation requirements is high, reclaim target and take recycle-water as main, and paper pulp fiber, filler is transferred in mud, cause waste and secondary pollution, can not meet higher cleaner production requirement.
Summary of the invention
The object of the invention is the various deficiencies for existing embrane method Processing Paper Wastewater: as end treatment, before processing, need waste water to carry out complicated preliminary treatment and take recycle-water can not effectively reclaiming the present situation of paper pulp as object, provide the unnecessary plain boiled water resource of a kind of paper machine room to reclaim the method for paper pulp and water, it is from source that the method solves thinking, directly adopt high flux, high stability, antipollution, the unnecessary plain boiled water of silicon carbide film filtration plant firm in structure, the low unnecessary plain boiled water of slurry concentration is concentrated into the papermaking reuse slurry of 1wt%-6wt%.
Another problem that the present invention will solve is: avoid existing application of membrane separation technology in water treatment end, pretreatment process length, investment and the high situation of operating cost, a kind of directly technology of the unnecessary plain boiled water of using membrane separating technology processing high concentration in workshop is provided, end treatment is become to source and reclaim, belong to the category of cleaner production.
The problem that the present invention also will solve is: improve the situation of existing separation membrane to high temperature plain boiled water bad adaptability, the method that provides a kind of 20-75 of tolerance ℃ of high temperature plain boiled water film to process.
For solving the technical problem existing in unnecessary plain boiled water film processing, technical solution of the present invention is as follows:
The unnecessary plain boiled water resource of a kind of paper machine room reclaims the method for paper pulp and water, at the unnecessary plain boiled water of paper machine room, produce link, directly adopt silicon carbide film cross-flow filtration system to filter the unnecessary plain boiled water of high concentration and high-temperature, hold back paper pulp fiber, filler and large molecule auxiliary agent in unnecessary plain boiled water, produced cleaner liquid and concentrate, and reached and reclaim valuable paper pulp composition in unnecessary plain boiled water and object that can reuse clear water simultaneously.
Concrete implementation step is as follows:
(1) collection of unnecessary plain boiled water
The unnecessary plain boiled water that paper machine room copy paper workshop section is produced is collected in a collecting tank, and this collecting tank only plays the effect of adjust flux, does not need to add flocculant and air supporting preliminary treatment.
(2) silicon carbide film cross-flow filtration system
Silicon carbide film cross-flow filtration system consists of feed pump, circulating pump, pipeline and silicon carbide film assembly and mating valve, flowmeter, Pressure gauge, thermometer and control system, and wherein circulating pump, pipeline and silicon carbide film assembly form closed circuit; The unnecessary plain boiled water of collecting is transported to pump inlet by feed pump by the liquid of certain pressure, and circulating pump is transported to silicon carbide film assembly by feed pump feed liquor and pipeline concentrate, crosses cleaner liquid and produces on membrane module, and concentrate produces in assembly rear end; Control system can adopt operation manually or automatically, can online backflushing and Chemical cleaning.
(3) online backflushing reproducer
Along with the carrying out of filtering, film pollutes progressively aggravation, when membrane flux is reduced to the 50-70% of initial flux, or the interval set time, online backflushing regeneration started, backwash liquid is filtered fluid, by compressed air or recoil pump, provide kickback pressure, circulating pump continuous service during recoil, feed pump passes through variable frequency control, before recoil, first reduce pump discharge to the 10%-50% of initial value, then close clear liquid.
(4) Chemical cleaning and reproducer
Before and after recoil, membrane flux changes when little, starts Chemical cleaning program, first shuts down emptying filtration system, then washes from the beginning, and clear water is washed rear employing 1000ppm-4000ppm liquor natrii hypochloritis and cleaned, and scavenging period is controlled at 30-120min; And then clean 1-3 time with running water; One or more mixed acid in the nitric acid that is 0.5-3 by pH value again, hydrochloric acid, phosphoric acid clean, scavenging period 30-60min; And then clean 2-3 time with running water, and can complete Chemical cleaning and regeneration, clean caudacoria flux recovery more than 99%.Before cleaning, by feed pump, add running water or liquor natrii hypochloritis or acid solution, filtration system stops feed pump after filling it up with, and closes charging and discharge valve, and startup circulating pump circulates cleaning fluid to soak and clean in system.
As preferably, the unnecessary plain boiled water resource of a kind of paper machine room reclaims the method for paper pulp and water, and in described step (2), silicon carbide film consists of pure matter carborundum, and membrane structure is unsymmetric structure or symmetrical structure, and film characterizes aperture value between 0.01 μ m-5 μ m.
As preferably, the unnecessary plain boiled water resource of a kind of paper machine room reclaims the method for paper pulp and water, and in described step (2), membrane module is single core or multicore, and component count is one or more groups, and assembly spread pattern is combination in parallel, serial or parallel connection series connection.
As preferably, the unnecessary plain boiled water resource of a kind of paper machine room reclaims the method for paper pulp and water, and in described step (2), feed pump lift is at 10-60m, and flow is determined according to treating capacity; Circulating pump lift is at 10-30m, and flow is 2-6 times for the treatment of capacity.
As preferably, the unnecessary plain boiled water resource of a kind of paper machine room reclaims the method for paper pulp and water, and in described step (3), kickback pressure is at 0.3-1MPa, and the recoil time is at 0.1-10s.
The method and technology scheme that the unnecessary plain boiled water resource of a kind of paper machine room of the present invention reclaims paper pulp and water has following beneficial effect:
1. the unnecessary plain boiled water resource of paper machine room of the present invention reclaims the method for paper pulp and water, can be without preliminary treatment, directly by film, process the unnecessary plain boiled water of high concentration and high temperature in workshop, belong to the clean technologies that process in source, flow process is simple, can significantly reduce the separated investment of film and operating cost, and be easy to management.
2. the unnecessary plain boiled water resource of paper machine room of the present invention reclaims the method for paper pulp and water, can not introduce the secondary pollutions such as flocculant, antisludging agent, after processing, concentrate composition is the active ingredients such as original paper cellulose, filler and large molecule auxiliary agent, can direct reuse in paper; Process rear clear liquid turbidity lower than 3NTU, and COD
crsignificantly reduce, can substitute clear water be back to rush net, rush blanket, the industrial water link such as sealing, and can be used as workshop flushing water.The method can reclaim paper pulp and water resource simultaneously, produces larger economic benefit and social benefit.
3. the unnecessary plain boiled water resource of paper machine room of the present invention reclaims the method for paper pulp and water, adopt high flux, high stability, antipollution, silicon carbide film firm in structure, organic film has advantages of long service life, does not need preliminary treatment, investment and operating cost all low relatively.
4. the unnecessary plain boiled water resource of paper machine room of the present invention reclaims the method for paper pulp and water, flow process is simple, floor space is little, can directly build in paper machine room, can not impact existing paper making equipment, be applicable to grassroot project or off-the-shelf item transformation, the plain boiled water that can be widely used in various papermaking enterprises is processed.
Accompanying drawing explanation
The unnecessary plain boiled water resource of a kind of paper machine room of Fig. 1 reclaims method and the device schematic diagram of paper pulp and water, description of reference numerals: unnecessary plain boiled water entrance 1, collecting tank 2, running water entrance 3, Chemical cleaning medicament entrance 4, purge tank 5, feed pump 6, Pressure gauge 7, flowmeter 8, circulating pump 9, membrane module 10, concentrate floss hole 11, recoil tank 12, compressed air inlet 13, filtration purified liquor outlet 14.
The specific embodiment:
Below in conjunction with example, further illustrate the present invention, but be not subject to any restriction of context of the present invention.
For the unnecessary plain boiled water design in certain toilet paper papermaking enterprise workshop as shown in Figure 1, described device comprises unnecessary plain boiled water collecting tank 2, Chemical cleaning tank 5, feed pump 6, Pressure gauge 7, flowmeter 8, circulating pump 9, membrane module 10, recoil tank 12; Import and export comprise unnecessary plain boiled water import 1, concentrate floss hole 11, filter course purified liquor outlet 14, clean running water entrance 3, Chemical cleaning medicament entrance 4, compressed air inlet 13; Membrane module adopts two and two string combinations, totally 4 groups.
More than form and adopt stainless steel 304 pipeline to connect, wherein unnecessary plain boiled water entrance 1 accesses collecting tank 2, collecting tank 2 lower ends are connected with feed pump 6, connect the bypass duct of a valve control to purge tank 5 belows before feed pump, and running water entrance 3 and Chemical cleaning medicament entrance 4 are opened in purge tank 5 tops; The front setting pressure table 7 of feed pump 6 and flowmeter 8, feed pump 6 passes through Frequency Converter Control, feed pump 6 outlet access circulating pump 9 imports, circulating pump 9 outlet setting pressure table 7 and flowmeters 8, circulating pump 9 outlet access membrane modules 10, membrane module 10 adopts two strings two formula combination, and concentrate outlet 11 is set after membrane module 10, and rear and circulating pump 9 is connected to form loop; Membrane module 10 clear liquid outlets are connected and access recoil tank 12, and recoil tank 12 tops arrange compressed air 13 access ports, and upper side opening is clear liquid outlet 14.
Concrete treatment step is as follows:
(1) collection of unnecessary plain boiled water
The unnecessary plain boiled water that paper machine room copy paper workshop section is produced is collected in collecting tank, and collecting tank volume is defined as the treating capacity of 60 minute time of staying.
(2) silicon carbide film cross-flow filtration
Membrane filtration system is chosen the silicon carbide film of 0.2 micron, combining form be two strings two also.By feed pump 6, unnecessary plain boiled water is delivered to circulating pump 9, pipeline and silicon carbide film assembly 10 and forms closed circuit, by Frequency Converter Control feed pressure table 7 at 0.3MPa; Unnecessary plain boiled water is transported to silicon carbide film assembly 10 by circulating pump 9, and it is 2.5m/s that crossflow velocity is controlled, and crosses cleaner liquid and produces on membrane module, after collecting, passes through clear liquid outlet 14 discharge systems by pipeline on recoil tank 12; Silicon carbide film assembly 10 rear ends arrange concentrated solution outlet 11, by valve opening, adjust cycles of concentration, unnecessary white slurry density can be concentrated into 3% by 0.3%; The unnecessary plain boiled water of whole system is constantly inputted, and concentrate outlet 11 and clear liquid outlet 14 are constantly discharged, and realizes the recovery of paper pulp and the generation of crossing cleaner liquid.
(3) online backflushing reproducer
Along with the carrying out of filtering, film pollutes progressively aggravation, when membrane flux be reduced to initial flux 70% time prepare to start online backflushing regeneration, before recoil, first reduce feed pump 6 flows to 20% of initial value, close clear liquid side outlet valve, open again compressed air inlet 13, realize recoil, the recoil time is 1s, circulating pump continuous service during recoil, the recoil time arrives rear closes compression air intake 13, then opens clear liquid side outlet valve and continue to filter.
(4) Chemical cleaning and reproducer
Before and after recoil, membrane flux changes when little, start Chemical cleaning program, first shut down emptying filtration system, then close collecting tank outlet valve, open running water entrance 3, enter a certain amount of clear water, then by feed pump 6, pump into clear water, after system water to be recycled is full, close feed pump and valve, then open circulating pump 9 and carry out clear water and wash, scavenging period is 5 minutes, then emptying whole system, completes clear water and washes, and Process of Chemical Cleaning is described similar above, just, in running water adition process, add a certain amount of clorox or nitric acid simultaneously; Process of Chemical Cleaning is that first clear water is washed 3 times, and sodium chlorate cleans 1 time again, then clear water is washed 2 times, and then nitric acid cleans 1 time, finally clear water is washed 2 times again, and wherein to clean liquor natrii hypochloritis's concentration be 2500ppm to clorox, nitric acid acidwashing pH value of solution is 2, cleans caudacoria flux recovery more than 99%.
Before processing, white slurry density is that 0.3%, SS concentration is 3000mg/l, COD
crfor 1100mg/l, after silicon carbide film cross-flow filtration system is processed, filtered fluid turbidity is 0.5NTU, and SS is 0.3mg/l, COD
crfor 60mg/l, meet and to rush net and rush blanket water supply standard; Concentrate slurry concentration is 3%, can be used as enriched water reuse paper; More than process and reach the effect that simultaneously reclaims paper pulp and water.
Difference from Example 1 is:
For certain high-grade culture paper manufacturing enterprise, adopt 0.08 μ m silicon carbide film filtration plant plain boiled water, as shown in Figure 1, control transmembrane pressure is 0.45MPa in technological process, crossflow velocity is 3m/s; Processing unnecessary white slurry density between front truck is that 0.45%, SS concentration is 4500mg/l, COD
crfor 1000mg/l, after silicon carbide film cross-flow filtration system is processed, filtered fluid turbidity is 0.3NTU, and SS is 0.2mg/l, COD
crfor 50mg/l, meet papermaking recycle-water standard; Concentrate slurry concentration is 4%, can be used as enriched water direct reuse paper; More than process and reach the effect that simultaneously reclaims paper pulp and water.
The above, only for patent preferred embodiment of the present invention, can not limit scope of the invention process successively, according to the scope of the claims of the present invention and description institute equivalence change and modification, all should belong in the scope that the present invention contains.
Claims (5)
1. the unnecessary plain boiled water resource of a paper machine room reclaims the method for paper pulp and water, it is characterized in that: at the unnecessary plain boiled water of paper machine room, produce link, directly adopt silicon carbide film cross-flow filtration system to filter the unnecessary plain boiled water of high concentration and high-temperature, hold back paper pulp fiber, filler and large molecule auxiliary agent in unnecessary plain boiled water, produced cleaner liquid and concentrate, and reached and reclaim valuable paper pulp composition in unnecessary plain boiled water and object that can reuse clear water simultaneously.
Concrete implementation step is as follows:
(1) collection of unnecessary plain boiled water
The unnecessary plain boiled water that paper machine room copy paper workshop section is produced is collected in a collecting tank, and this collecting tank plays the effect of adjust flux.
(2) silicon carbide film cross-flow filtration system
Silicon carbide film cross-flow filtration system consists of feed pump, circulating pump, pipeline and silicon carbide film assembly and mating valve, flowmeter, Pressure gauge, thermometer, and wherein circulating pump, pipeline and silicon carbide film assembly form closed circuit; The unnecessary plain boiled water of collecting is transported to pump inlet by feed pump by the liquid of certain pressure, and circulating pump is transported to silicon carbide film assembly by feed pump feed liquor and pipeline concentrate, crosses cleaner liquid and produces on membrane module, and concentrate produces in assembly rear end.
(3) online backflushing reproducer
Along with the carrying out of filtering, film pollutes progressively aggravation, when membrane flux is reduced to the 50-70% of initial flux, or the interval set time, online backflushing regeneration started, backwash liquid is filtered fluid, by compressed air, promoted, circulating pump continuous service during recoil, feed pump passes through variable frequency control, before recoil, first reduce pump discharge to the 10%-50% of initial value, then close clear liquid.
(4) Chemical cleaning and reproducer
Before and after recoil, membrane flux changes when little, starts Chemical cleaning program, first shuts down emptying filtration system, then washes from the beginning, and clear water is washed rear employing 1000ppm-4000ppm liquor natrii hypochloritis and cleaned, and scavenging period is controlled at 30-120min; And then clean 1-3 time with running water; One or more mixed acid in the nitric acid that is 0.5-3 by pH value again, hydrochloric acid, sulfuric acid, phosphoric acid clean, scavenging period 30-60min; And then clean 2-3 time with running water, and can complete Chemical cleaning and regeneration, clean caudacoria flux recovery more than 99%.Before cleaning, by feed pump, add running water or liquor natrii hypochloritis or acid solution, filtration system stops feed pump after filling it up with, and closes charging and discharge valve, and startup circulating pump circulates cleaning fluid to soak and clean in system.
2. the unnecessary plain boiled water resource in a kind of workshop according to claim 1 reclaims the method for paper pulp and water, it is characterized in that: described method does not need the unnecessary plain boiled water in workshop to carry out air supporting or flocculation sediment or coarse filtration preliminary treatment, can directly enter film separation system, can not introduce new chemical substance to pulping water system and cause secondary pollution.
3. the unnecessary plain boiled water resource in a kind of workshop according to claim 1 reclaims the method for paper pulp and water, it is characterized in that: film separation system adopts silicon carbide film cross-flow filtration system, silicon carbide film aperture is at 0.01-5 μ m, transmembrane pressure is at 0.1-0.6MPa, crossflow velocity is at 1-6m/s, operating temperature is at 20-70 ℃, and membrane module combines for considering many and many strings that fluid is optimized.
4. the unnecessary plain boiled water resource in a kind of workshop according to claim 1 reclaims the method for paper pulp and water, it is characterized in that: by regulating feed pump, purified liquor outlet valve and dope outlet valve, unnecessary plain boiled water dope slurry concentration can be concentrated between 1-6%, formation is the new paper pulp of production reuse directly; Produce simultaneously turbidity at 3NTU with interior clear liquid, can reuse do wet end flushing water, sealing water, cooling water and fresh water (FW); When realizing paper pulp, clear water, reclaim and resource.
5. the unnecessary plain boiled water resource in a kind of workshop according to claim 1 reclaims the method for paper pulp and water, it is characterized in that: for film, pollute online backflushing and the two kinds of methods of Chemical cleaning regeneration of arranging, wherein online backflushing adopts 0.5-1.0MPa compressed air as power, and the recoil time is at 0.1-5s; Chemical cleaning adopts inorganic acid and clorox, and inorganic acid comprises one or more in nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, and inorganic acid pH value is controlled between 0.5-3, and liquor natrii hypochloritis is controlled between 1000ppm-4000ppm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108166299A (en) * | 2017-12-12 | 2018-06-15 | 玖龙纸业（东莞）有限公司 | A kind of papermaking coating filter flushing water recycling system and its method |
| CN110204140A (en) * | 2019-05-06 | 2019-09-06 | 苏州久沛环保科技有限公司 | A kind of hospital sewage treatment device and its sewage water treatment method |
| CN111410270A (en) * | 2020-03-27 | 2020-07-14 | 湖南钜晟环保科技工程有限公司 | Process and system for treating desulfurization wastewater by membrane method |
| CN114728819A (en) * | 2019-11-25 | 2022-07-08 | Ihi 运搬机械株式会社 | Method and apparatus for treating coal drainage |
-
2014
- 2014-01-17 CN CN201410023029.1A patent/CN103757971A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108166299A (en) * | 2017-12-12 | 2018-06-15 | 玖龙纸业（东莞）有限公司 | A kind of papermaking coating filter flushing water recycling system and its method |
| CN108166299B (en) * | 2017-12-12 | 2020-08-11 | 玖龙纸业（东莞）有限公司 | Recycling system and method for rinsing water of papermaking coating filter |
| CN110204140A (en) * | 2019-05-06 | 2019-09-06 | 苏州久沛环保科技有限公司 | A kind of hospital sewage treatment device and its sewage water treatment method |
| CN114728819A (en) * | 2019-11-25 | 2022-07-08 | Ihi 运搬机械株式会社 | Method and apparatus for treating coal drainage |
| CN111410270A (en) * | 2020-03-27 | 2020-07-14 | 湖南钜晟环保科技工程有限公司 | Process and system for treating desulfurization wastewater by membrane method |
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Application publication date: 20140430 |
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