CN1270982C - Process for comprensive treating waste water of paper making by grass pulp - Google Patents
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- CN1270982C CN1270982C CNB2004100409734A CN200410040973A CN1270982C CN 1270982 C CN1270982 C CN 1270982C CN B2004100409734 A CNB2004100409734 A CN B2004100409734A CN 200410040973 A CN200410040973 A CN 200410040973A CN 1270982 C CN1270982 C CN 1270982C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention provides a comprehensive treatment method of waste water from paper making by grass pulp. The present invention is characterized in that the waste water is preliminarily dipped by using an alkaline method and quickly cooked at low temperature; anthraquinone derivatives, alkylbenzene sulfonate, epoxy ethane, etc. are used to prepare a cooking active agent for cooking; five home-made flocculating agents are used according to different sequences and time intervals so that flowing black liquid is rapidly separated, flocculated, decolorized and treated in the mode of lignin decomposition and deposited; after anaerobic digestion, the black liquid enters an aerobic aeration pool to contacts a biological film so as to be sufficiently purified, and separated waste slag is dewatered and can be used as an agriculture slag fertilizer. The present invention can effectively reduce pollution load and drain stably qualified waste water and both protects environment and thoroughly solves the enormous problem of environmental pollution caused by the waste water of grass pulp.
Description
Technical field
The invention provides a kind of method of comprehensively treating waste liquid from paper-making, what be specifically related to is the straw-pulp-papermaking wastewater measure of comprehensive.
Background technology
For a long time, for the straw-pulp-papermaking wastewater improvement technology that causes severe contamination to environment, never be well solved, its reason is that the disposable construction investment of alkali recovery technology is big, many enterprises are difficult to bear, owing to reasons such as straw pulp black liquor silicon interference, the straw pulp black liquor extraction yield is low in addition, and concentration and calorific value do not reach technical requirements.Straw pulp alkali reclaims and can not steady in a long-term move, and it is too high to reclaim the alkali cost, and the actual production effect is undesirable.Domestic present existing black liquor treatment technology, as lignin by acid separation, methods such as local method alkali recovery, the example that reaches the industrially scalable successful operation is still rare, major cause be technology do not pass a test and running cost too high, treatment facility is built to such an extent that can not reinstate.Develop for this reason, develop, improve pulping process, integrate black liquor of pulp making, the comprehensive treatment scheme of middle-stage wastewater, paper machine white water and recovery resource is extremely urgent.
Summary of the invention
The objective of the invention is provides a kind of straw-pulp-papermaking wastewater comprehensive processing method in order to overcome the present situation of existing straw-pulp-papermaking wastewater serious environment pollution.
Straw-pulp-papermaking wastewater comprehensive processing method technology contents is as follows:
Comprehensive processing method provided by the present invention is compared with existing improvement method and be it is characterized in that:
A) reach by oxyethane with anthraquinone derivative, alkylbenzene sulphur sodium, high fatty alcohol, sulfosalt surfactant, the boiling promoting agent cooking of pulp of α-ethylhexanol polyvinyl chloride ether phosphoric acid monoesters preparation is to cut down the black digestion liquid pollution load.
B) 5 kinds of flocculation agents of preparation, form flocculation agent No. 1 by hydrochloric acid and sulfuric acid, coagulant aids and Polyscrylamide are formed No. 2 flocculation agents, finings and decolor flocculating agent are formed No. 3 flocculation agents, polyaluminium sulfate and coagulant aids are formed No. 4 flocculation agents, iron trichloride and chitosan are formed No. 5 flocculation agents, press different orders and pitch time to the black digestion liquid delivering medicament, promptly add the flocculation agent lignin by acid separation earlier No. 1, added No. 5 and No. 2 flocculation agents less than 1 minute at interval, make xylogen and turbid liquid precipitation separation in the described black liquor, it is big that throw out becomes, and at interval less than 1 minute, adds No. 3 and No. 4 flocculation agents, clarifying turbid liquid is analysed more clearly, impel throw out to accelerate precipitation;
C) through b) the black liquor of materialization after handling through being no less than anaerobic digestion in 192 hours, effectively reduce the pollution load of chemical oxygen demand;
D) middle section water, paper machine white water are handled with described flocculation agent materialization after fiber recovery, through abundant post precipitation, enter Aerobic Pond with the black liquor of anaerobic digestion post precipitation, with sudden and violent gas of machinery and sudden and violent naturally gas phase combination, the circulation of waste water through being not less than 72 hours contacts with microbial film, fully purifies;
E) the isolating waste residue in materialization flocculation back is made agriculture slag fertilizer after dewatering.
The boiling promoting agent is by oxyethane, high fatty alcohol, sulfosalt surfactant, α-ethylhexanol polyvinyl chloride ether phosphoric acid monoesters preparation, the preparation weight percent is 5: 2: 2: 1, compound method is earlier even mechanically mixing, pyrocondensation left standstill 40～60 minutes again.Boiling promoting agent dosage is 1.0 ‰～2.0 ‰ by the per-cent metering of boiling material weight.
Flocculation agent has five kinds, and the preparation weight percent is respectively: No. 1 flocculation agent is that hydrochloric acid is 4: 6 than sulfuric acid.No. 2 flocculation agents are that coagulant aids is 3: 7 than Polyscrylamide.No. 3 flocculation agents are that finings is 4: 6 than decolor flocculating agent.No. 4 flocculation agents are that polyaluminum sulfate aluminum ratio coagulant aids is 5: 5.No. 5 flocculation agents are that iron trichloride is 7: 3 than chitosan.The flocculation agent dosage is No. 1 flocculation agent 0.18%～0.42% by the weight percent metering for the treatment of water, No. 2 flocculation agents 0.001%～0.0025%, 0.00008%～0.002%, No. 5 flocculation agents 0.00015%～0.0025% of 0.0012%～0.003%, No. 4 flocculation agents of No. 3 flocculation agents.
The paper flow process is: cut bamboo (chaffcutter)-preimpregnation-boiling-two net spiral vacuum press filtration wash hollanders-concentrate-pipeline bleaching-pulp chloridizator benefit and float-eliminate residual chlorine-two net spiral vacuum press filtration wash hollanders-pull an oar-prepare burden-copy paper-cut-pack-finished product.Produce a large amount of black liquor, middle-stage wastewater, paper machine white water, waste residue in process of production, cause severe contamination to environment.
Straw-pulp-papermaking wastewater improvement method provided by the invention is that collection slurrying, poaching wastewater are handled, industrial chemicals is recovered in one.Traditional pulping process is transformed, and changing traditional sulphate cook is alkaline process preimpregnation low temperature high speed cooking.Replace Sodium Sulphide with the boiling promoting agent, do not produce deleterious hydrogen sulfide, reduce pollution air.Changing single stage bleaching is the pipeline tri-stage bleaching, saves about 50 tons of ton paper water consumption.Homemade new and effective biological assistant has played retention, wet enhanced effect, has improved quality product, reduces cost.Also reduce fiber fines and the talcum powder in the plain boiled water simultaneously, thereby cut down pollution load.
The technical process of straw-pulp-papermaking wastewater comprehensive processing method as shown in Figure 1.Black liquor circulates through the homogeneous pond, attemperation, reduction ξDian Wei, equilibrium concentration.Add the medicament acid out.Black liquor in materialization 1, in order with throw in different pitch time the self-control special agent, carry out three grades of materializations, make black liquor half a minute flocculation sediment rapidly just approximately in flowing, and decolouring, this moment, PH was about 4～5.After separating slagging-off, through the two-stage materialization, under the effect of special agent, abundant flocculation sediment, the black liquor of this moment is the transparent liquid of Sandy, and clear liquid is at this moment regulated different PH just can be back to boiling or pulp washing.Enter the flow lifting type anaerobic digester behind rare black liquor pulp washing and together enter settling tank through the middle section water of anaerobic digestion and physical reaction.
Middle section water be a large amount of wash, sieve, drift ice, after fiber recovery is slightly starched reuse,, reach in order and throw in homemade three kinds of medicaments pitch time again through materialization 3, cut down pollution load, fully flocculation slagging-off enters settling tank No. 1.
Paper machine white water, separates the slagging-off back and flows into No. 2 settling tanks again through materialization 4 flocculation reactions through recycled fiber, and through fully reaction rear section reuse and production, part enters Aerobic Pond.
Waste water in No. 1 settling tank is behind abundant materialization flocculation sediment, flow into Aerobic Pond, sudden and violent gas of machinery and sudden and violent naturally gas phase combination, in three Aerobic Ponds of different drops, circulate after 72 hours, about 10% passes back into the circulating carrier that No. 1 settling tank increases aerobic bacteria, and about 20% is back to production, and remaining 70% effluxes behind froth breaking.
Treating processes and proportioning process parameter:
Digestion process: dress pot (60 minutes), idle running (20 minutes) once heats up (20 minutes, 2kg pressure), little exhaust (5 minutes), secondary temperature elevation (50 minutes, 6kg pressure), insulation (30 minutes, 6kg pressure) is spurted.
Spray medicament: 1. boiling promoting agent consumption: 1.0 ‰～2.0 ‰
2. caustic soda NaOH consumption: 14%～18%
3. the black digestion liquid (degree Beaume is 6～8, and PH is 14) after handling, as the part of cooking liquor, liquor ratio 1: 3.0
The boiling promoting agent: the boiling promoting agent is the organic active agent with multiple yin, yang ion population, has multi-functional osmosis.Its main component is oxyethane, high fatty alcohol, sulfosalt surfactant, α-ethylhexanol polyvinyl chloride ether phosphoric acid monoesters, the preparation weight percent is 5: 2: 2: 1, compound method is even mechanically mixing, pyrocondensation left standstill 40～60 minutes again, and metering is distributed into pouch.
Flocculation agent: No. 1 flocculation agent hydrochloric acid was than sulfuric acid 4: 6
No. 2 flocculation agent coagulant aidss were than Polyscrylamide 3: 7
No. 3 flocculation agent finingss were than high-efficient decolorizing flocculant 4: 6
No. 4 flocculant poly Tai-Ace S 150 was than coagulant aids 5: 5
The agent of No. 5 flocculation agent multifunctional bio-actives was than the polymkeric substance of macromolecule 7: 3
(the multifunctional bio-active agent refers to iron trichloride, and the polymkeric substance of macromolecule is a chitosan)
Feeding operations: 1. add flocculation agent No. 1, a large amount of xylogen of acid out.
2. at interval less than 1 minute, add No. 5, No. 2 flocculation agents and make xylogen and the very fast precipitation separation of turbid liquid in the waste water, it is big that throw out becomes,
3. at interval less than 1 minute, add flocculation agent No. 3, No. 4, make clarifying turbid liquid more clear, impel throw out to become the big precipitation of accelerating.
The black liquor treatment scheme:
1. after digesting technoloy improves, ton is starched the black liquor generation be controlled in 23 cubic metres, black liquor entered the circulation of homogeneous pond after 24 hours, made temperature be reduced to 35 ℃, PH and reached about 12, made organism in the black liquor obtain to a certain degree degraded simultaneously, promoted to decompose.
2. the concentrated black liquid in the homogeneous pond (about 9 tons of ton slurry) is with being pumped to pipeline, drop into three kinds of special agents (being materialization 1), acid out, flocculation, decolouring, precipitating organic matters and inorganics, add medicament No. 1, separate xylogen and inorganics in the black liquor, dropped into No. 5 medicaments at interval in about 10 seconds, make black liquor flocculation and decolouring rapidly, drop into medicament again No. 2 after 10 seconds at interval, make slag, water sepn, the pH value of this moment reduces to 4～5, enters reaction tank, through fully after the reaction slag being separated, black liquor after the slagging-off becomes the transparent liquid of Sandy by brown, adds No. 4 medicaments, i.e. materialization 2 at interval in 30 seconds after adding No. 3 medicaments again, the clear liquid of this moment transfers to 14 with PH and is back to boiling, and this black liquor alkalinity is about 4～6% of liquid caustic soda; Rare black liquor in the homogeneous pond (about 14 tons of ton slurry), to handle by the medicament of handling concentrated black liquid and pitch time, only consumption has different.The clear liquid PH of this moment reaches 4～5, can be back to pulp washing, behind the pulp washing PH is transferred to 6.5～8.5 usefulness pumps input flow lifting type anaerobic activated sludge pond, through fully entering settling tank No. 1 after the anaerobic digestion.
3. the technology implementation effect of novel process: traditional acid out black liquor, make organism and inorganicss such as most alkali lignins in the black liquor, under the effect of acid, be decomposed into insoluble salt and xylogen.These materials are present in the black liquor with suspended state, can't separate.Yet novel process has overcome the shortcoming that traditional flocculant can not separate xylogen in the black liquor, and homemade special agent was thrown in by different pitch times, made that the black liquor in flowing flocculates rapidly, decolours, precipitates.This is a major technological breakthrough.Will be through materialization 2 reacted black liquor, be back to boiling or pulp washing behind the adjusting PH, not Money Value Only, make the pH value neutralization of pulp washing, reduce the middle section water processing cost, also make pulp washing not produce the alkali bubble simultaneously, reduce the pollution load of chemical oxygen demand, this is the breakthrough of conventional art.
4. traditional anaerobe engineering being applied to black liquor handles, black liquor after the materialization enters the active anaerobic sludge of flow lifting type pond, through abundant anaerobic digestion, under the effect of anaerobion, black liquor is fermented, resolve into the required nutraceutical matrix of microorganism, promote that the biogas bacterium in the anaerobic pond breeds rapidly; The biogas bacterium had both reduced the pollution load of chemical oxygen demand, made the organism after fermentation decompose generation biogas again, and inorganics is precipitated as slag.Generate anaerobism active particle mud.The about 5-10% of black liquor after the anaerobism refluxes in anaerobic pond as circulating carrier, has controlled the growth of biogas bacterium in fermentation stage, and through cutting down pollution load about 80% after the anaerobic digestion, this is again a breakthrough.
5. the slag of black liquor after the materialization flocculation separation is rich in humic acid and organic matter, and be useful and harmless to agriculture production, but processing is a compoiste fertilizer.
6. dosage is pressed the weight percent metering for the treatment of water, and ratio is as follows:
No. 1 flocculation agent 0.35%～0.42% of concentrated black liquid,
No. 2 flocculation agents 0.0016%～0.0025%,
No. 3 flocculation agents 0.002%～0.003%,
No. 4 flocculation agents 0.0026%～0.0038%,
No. 5 flocculation agents 0.0028%～0.0042%;
Rare black liquor, No. 1 flocculation agent 0.18%～0.23%,
No. 2 flocculation agents 0.001%～0.0015%,
No. 3 flocculation agents 0.0012%～0.002%,
No. 4 flocculation agents 0.0016%～0.002%,
No. 5 flocculation agents 0.0018%～0.0025%,
The middle section water resolution:
At first the residual chlorine in the rinse water is adjusted at below the 0.2g/L, has created favourable condition, handle through materialization again for the microorganism growth in the Aerobic Pond, throw in three kinds of different medicaments, the interval is 20 seconds after No. 1 medicament dosing, adds medicament again No. 2, adds medicament again No. 3 after 10 seconds at interval.Fully flocculation reaction, the separation slagging-off is controlled at 5-6 with PH and enters settling tank No. 1.
Dosage, the weight percent metering of pressing treating water:
0.0008%～0.0015%, No. 3 flocculation agents 0.0003%～0.0005% of 0.006%～0.01%, No. 2 flocculation agents of No. 1 flocculation agent;
The paper machine white water resolution:
Paper machine white water is after fiber recovery, and the screened stock reuse adds No. 4 medicament, adds No. 5 medicaments at interval in 10 seconds, fully reaction back slagging-off, and about 80% is back to production, and 20% enters settling tank No. 2.
Dosage, the weight percent metering of pressing treating water:
0.00008%～0.0001%, No. 5 flocculation agents 0.00015%～0.0002% of No. 4 flocculation agents;
Through No. 1, No. 2 abundant reacted comprehensive wastewaters of settling tank PH is controlled at 6.5～8.5 and enters Aerobic Pond.Sudden and violent gas of machinery and sudden and violent naturally gas phase combination are fully purified liquid waste in the Aerobic Pond of different drops.Waste water after the purification about 10% flows into No. 1 settling tank, and about 20% flows into clean water basin makes water of productive use, effluxes behind froth breaking.Composite waste enters No. 1 Aerobic Pond and enter No. 2 Aerobic Pond behind the sudden and violent gas of machinery, flows into Aerobic Pond again No. 3, backflow reuse or efflux after fully circulating 72 hours with the microbial film catalytic oxidation.Refluxing increases the circulating carrier of No. 1 settling tank aerobic bacteria, makes it long-term circulation, constantly multiplication, and this is that the bio-contact oxidation engineering is purified composite waste, cuts down the another breakthrough of pollution load.
The processing of waste residue:
Black liquor is rich in organic matter and humic acid through the slag of materialization flocculation separation, but processing is a compoiste fertilizer.About 0.71 ton of the ton slurry production quantity of slag is taken off pulp water and is entered settling tank No. 1.
The slag of composite waste precipitate and separate can be made the stopping composition of Production and Packaging paper.
Positively effect of the present invention:
Comprehensive regulation straw-pulp-papermaking wastewater can effectively be cut down pollution load, accomplishes qualified discharge steady in a long-term.Solve the Pollution abatement difficult problem of straw-pulp-papermaking wastewater, not only protected environment, solved the outlet of wheat straw again, both increased farmers' income, prevented new topsoil again.
Process for comprehensively treating, can accomplish discharged wastewater met the national standard, effectively cut down pollution load, can accomplish qualified discharge steady in a long-term, this cover process for comprehensively treating can be under the situation that the straw pulp alkali recovery technology does not reach a standard at present, the new approach of breaking is for papermaking straw pulp industry Sustainable development provides strong science and technology support.
Adopt special-purpose chemical agent flocculation, black liquor decomposes rapidly in several minutes, decolours, precipitates, and makes rapid precipitation separations such as xylogen, and the black liquor of chocolate becomes the transparent liquid of Sandy, can be back to boiling and pulp washing, this novel process is not seen open report both at home and abroad.
The anaerobic treatment technology of black liquor is converted into biogas with the pollution load of biodegradable chemical oxygen demand in the black liquor, and the energy is provided, and not only can improve water quality, but also reduce cost for wastewater treatment greatly.
The aerobic treatment of composite waste, sudden and violent gas of machinery and sudden and violent naturally gas phase combination, waste water contacts with microbial film, and easy and simple to handle stable, waste water fully is purified.Qualified discharge steady in a long-term can be accomplished fully.
This process for comprehensively treating, lower for wood pulp and bamboo pulp waste water treatment running cost, better effects if.This improvement technology can be applicable to the papermaking straw pulp enterprise of different scales.
Description of drawings
Fig. 1 straw-pulp-papermaking wastewater comprehensive processing method process flow sheet.
Embodiment
Embodiment 1
One. black liquor treatment scheme process:
1. the black liquor that preimpregnation low temperature high speed cooking is produced is homogeneous pond circulation 24 hours, makes temperature be reduced to 35 ℃, PH and reaches about 12.
With the concentrated black liquid in the homogeneous pond with being pumped to pipeline, add medicament No. 1, dropped at interval No. 5 medicaments in about 10 seconds, drop into medicament again No. 2 after 10 seconds at interval, enter reaction tank, added No. 4 medicaments in 30 seconds at interval after adding No. 3 medicaments again, PH is transferred to 14 is back to boiling.
3. with the rare black liquor in the homogeneous pond, handle by the medicament of handling concentrated black liquid and pitch time with being pumped to pipeline.The clear liquid PH of this moment reaches 4～5, is back to pulp washing, behind the pulp washing PH is transferred to 6.5～8.5 usefulness pumps input flow lifting type anaerobic activated sludge pond, through fully entering settling tank No. 1 after the anaerobic digestion.
4. dosage, the weight percent metering of pressing treating water:
Concentrated black liquid: 0.0026%, No. 5 flocculation agent 0.0028% of 0.002%, No. 4 flocculation agent of 0.0016%, No. 3 flocculation agent of 0.35%, No. 2 flocculation agent of No. 1 flocculation agent.
Rare black liquor: 0.0016%, No. 5 flocculation agent 0.0018% of 0.0012%, No. 4 flocculation agent of 0.001%, No. 3 flocculation agent of 0.18%, No. 2 flocculation agent of No. 1 flocculation agent.
Two. middle section water resolution process:
At first eliminate the residual chlorine in the middle-stage wastewater, threw in after No. 1 medicament dosing 20 seconds at interval, add medicament again No. 2, add medicament again No. 3 after 10 seconds at interval, PH is transferred to 5～6 enter settling tank No. 1.
Dosage is pressed the weight percent metering for the treatment of water:
0.0008%, No. 3 flocculation agent 0.0003% of 0.006%, No. 2 flocculation agent of No. 1 flocculation agent.
Three. paper machine white water resolution process:
Paper machine white water adds No. 4 medicaments and added No. 5 medicaments at interval in 10 seconds after fiber recovery, and slagging-off back 80% is back to production, and 20% enters settling tank No. 2.
Dosage is pressed the weight percent metering for the treatment of water:
0.00008%, No. 5 flocculation agent 0.00015% of No. 4 flocculation agents;
Four. the comprehensive wastewater treating processes:
Through the comprehensive wastewater of No. 1, No. 2 settling tank PH is controlled at 6.5～8.5 and enters Aerobic Pond.Fully purify liquid waste in the Aerobic Pond.Waste water after the purification about 10% flows into No. 1 settling tank, and 20% flows into clean water basin makes water of productive use, and 70% effluxes behind froth breaking.
Five. the treating processes of waste residue:
After the slag dehydration of black liquor, but processing is a compoiste fertilizer.Take off pulp water and enter settling tank No. 1.The slag of composite waste precipitate and separate can be made the stopping composition of Production and Packaging paper.
Embodiment 2
One. black liquor treatment scheme process:
1. the black liquor that preimpregnation low temperature high speed cooking is produced is homogeneous pond circulation 30 hours, makes temperature be reduced to 35 ℃, PH and reaches about 10.
With the concentrated black liquid in the homogeneous pond with being pumped to pipeline, add medicament No. 1, dropped at interval No. 5 medicaments in about 10 seconds, drop into medicament again No. 2 after 10 seconds at interval, enter reaction tank, added No. 4 medicaments in 30 seconds at interval after adding No. 3 medicaments again, PH is transferred to 12 is back to boiling.
3. with the rare black liquor in the homogeneous pond, handle by the medicament of handling concentrated black liquid and pitch time with being pumped to pipeline.The clear liquid PH of this moment reaches 4～5, is back to pulp washing, behind the pulp washing PH is transferred to 6.5～8.5 usefulness pumps input flow lifting type anaerobic activated sludge pond, through fully entering settling tank No. 1 after the anaerobic digestion.
4. dosage, the weight percent metering of pressing treating water:
Concentrated black liquid: 0.0038%, No. 5 flocculation agent 0.0042% of 0.003%, No. 4 flocculation agent of 0.0025%, No. 3 flocculation agent of 0.42%, No. 2 flocculation agent of No. 1 flocculation agent.
Rare black liquor: 0.002%, No. 5 flocculation agent 0.0025% of 0.002%, No. 4 flocculation agent of 0.0015%, No. 3 flocculation agent of 0.23%, No. 2 flocculation agent of No. 1 flocculation agent.
Two. middle section water resolution process:
At first eliminate the residual chlorine in the middle-stage wastewater, threw in after No. 1 medicament dosing 20 seconds at interval, add medicament again No. 2, add medicament again No. 3 after 10 seconds at interval, PH is transferred to 5～6 enter settling tank No. 1.
Dosage is pressed the weight percent metering for the treatment of water:
0.0015%, No. 3 flocculation agent 0.0005% of 0.01%, No. 2 flocculation agent of No. 1 flocculation agent.
Three. paper machine white water resolution process:
Paper machine white water adds No. 4 medicaments and added No. 5 medicaments at interval in 10 seconds after fiber recovery, and slagging-off back 80% is back to production, and 20% enters settling tank No. 2.
Dosage is pressed the weight percent metering for the treatment of water:
0.0001%, No. 5 flocculation agent 0.0002% of No. 4 flocculation agents;
Four. the comprehensive wastewater treating processes:
Through the comprehensive wastewater of No. 1, No. 2 settling tank PH is controlled at 6.5～8.5 and enters Aerobic Pond.Fully purify liquid waste in the Aerobic Pond.Waste water after the purification about 10% flows into No. 1 settling tank, and 20% flows into clean water basin makes water of productive use, and 70% effluxes behind froth breaking.
Five. the treating processes of waste residue:
After the slag dehydration of black liquor, but processing is a compoiste fertilizer.Take off pulp water and enter settling tank No. 1.The slag of composite waste precipitate and separate can be made the stopping composition of Production and Packaging paper.
Claims (5)
1. straw-pulp-papermaking wastewater comprehensive processing method is characterized in that comprehensive processing method is as follows:
A) reach the boiling promoting agent cooking of pulp of preparing by oxyethane, high fatty alcohol, sulfosalt surfactant and α-ethylhexanol polyvinyl chloride ether phosphoric acid monoesters with anthraquinone derivative, alkylbenzene sulphur sodium, to cut down the black digestion liquid pollution load;
B) 5 kinds of flocculation agents of preparation, form flocculation agent No. 1 by hydrochloric acid and sulfuric acid, coagulant aids and Polyscrylamide are formed No. 2 flocculation agents, finings and decolor flocculating agent are formed No. 3 flocculation agents, polyaluminium sulfate and coagulant aids are formed No. 4 flocculation agents, iron trichloride and chitosan are formed No. 5 flocculation agents, press different orders and pitch time to the black digestion liquid delivering medicament, promptly add the flocculation agent lignin by acid separation earlier No. 1, added No. 5 and No. 2 flocculation agents less than 1 minute at interval, make xylogen and turbid liquid precipitation separation in the described black liquor, it is big that throw out becomes, and at interval less than 1 minute, adds No. 3 and No. 4 flocculation agents, clarifying turbid liquid is analysed more clearly, impel throw out to accelerate precipitation;
C) through b) the black liquor of materialization after handling through being no less than anaerobic digestion in 192 hours, effectively reduce the pollution load of chemical oxygen demand;
D) middle section water, paper machine white water are handled with described flocculation agent materialization after fiber recovery, through abundant post precipitation, enter Aerobic Pond with the black liquor of anaerobic digestion post precipitation, with sudden and violent gas of machinery and sudden and violent naturally gas phase combination, the circulation of waste water through being not less than 72 hours contacts with microbial film, fully purifies;
E) the isolating waste residue in materialization flocculation back is made agriculture slag fertilizer after dewatering.
2. by the said straw-pulp-papermaking wastewater comprehensive processing method of claim 1, it is characterized in that: by oxyethane, high fatty alcohol, the boiling promoting agent of sulfonate and α-ethylhexanol polyvinyl chloride ether phosphoric acid monoesters preparation, the preparation weight percent, ratio is 5: 2: 2: 1, compound method is that mechanically mixing is even, pyrocondensation left standstill 40 to 60 minutes again.
3. by claim 1 or 2 said straw-pulp-papermaking wastewater comprehensive processing methods, it is characterized in that: by oxyethane, high fatty alcohol, the boiling promoting agent of sulfonate and α-ethylhexanol polyvinyl chloride ether phosphoric acid monoesters preparation is 1.0 ‰～2.0 ‰ by the per-cent metered amount of boiling material weight.
4. by the said straw-pulp-papermaking wastewater comprehensive processing method of claim 1, it is characterized in that: flocculation agent preparation weight percent, ratio is: No. 1 flocculation agent is a hydrochloric acid than sulfuric acid 4: 6; No. 2 flocculation agents are coagulant aidss than Polyscrylamide 3: 7; No. 3 flocculation agents are finingss than decolor flocculating agent 4: 6; No. 4 flocculation agents are polyaluminum sulfate aluminum ratio coagulant aids 5: 5; No. 5 flocculation agents are iron trichlorides than chitosan 7: 3.
5. by claim 1 or 4 said straw-pulp-papermaking wastewater comprehensive processing methods, it is characterized in that: flocculation agent is No. 1 flocculation agent 0.18%～0.42% by the weight percent metering consumption for the treatment of water, No. 2 flocculation agents 0.001%～0.0025%, No. 3 flocculation agents 0.0012%～0.003%, 0.00008%～0.002%, No. 5 flocculation agents 0.00015%～0.0025% of No. 4 flocculation agents.
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|---|---|---|---|---|
| CN101838039A (en) * | 2010-04-13 | 2010-09-22 | 国家海洋局天津海水淡化与综合利用研究所 | Method for purifying seawater by taking vanillin modified chitosan as flocculant |
| CN102295395A (en) * | 2011-08-22 | 2011-12-28 | 西安青山环保科技有限公司 | Coarse-fiber alkali-method refined wastewater-processing system and wastewater-processing method |
| CN104310683B (en) * | 2014-09-18 | 2017-01-25 | 林连山 | Development and control method of papermaking wastewater |
| CN107840483A (en) * | 2017-11-03 | 2018-03-27 | 常熟浸大科技有限公司 | A kind of processing method of black liquid |
| CN110436715A (en) * | 2019-09-05 | 2019-11-12 | 山东银鹰股份有限公司 | A kind of Cotton Pulp Wastewater treatment process |
-
2004
- 2004-11-08 CN CNB2004100409734A patent/CN1270982C/en not_active Expired - Fee Related
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