CN1265378A - Papermaking wastewater treating agent and treating process thereof - Google Patents
Papermaking wastewater treating agent and treating process thereof Download PDFInfo
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- CN1265378A CN1265378A CN 99117180 CN99117180A CN1265378A CN 1265378 A CN1265378 A CN 1265378A CN 99117180 CN99117180 CN 99117180 CN 99117180 A CN99117180 A CN 99117180A CN 1265378 A CN1265378 A CN 1265378A
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- waste water
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- 239000002351 wastewater Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000010881 fly ash Substances 0.000 claims abstract description 55
- 239000000126 substance Substances 0.000 claims abstract description 29
- 239000000701 coagulant Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 239000002893 slag Substances 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000001556 precipitation Methods 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 6
- 239000010893 paper waste Substances 0.000 claims description 53
- 238000004062 sedimentation Methods 0.000 claims description 47
- 238000011282 treatment Methods 0.000 claims description 33
- 239000002956 ash Substances 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000002994 raw material Substances 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 9
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 6
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 6
- 239000003818 cinder Substances 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- 238000005345 coagulation Methods 0.000 claims description 4
- 230000015271 coagulation Effects 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 8
- 238000002156 mixing Methods 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 abstract description 3
- 239000000049 pigment Substances 0.000 abstract description 3
- 238000007667 floating Methods 0.000 abstract 1
- 238000007790 scraping Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 230000007613 environmental effect Effects 0.000 description 9
- 239000010865 sewage Substances 0.000 description 9
- 159000000013 aluminium salts Chemical class 0.000 description 7
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 7
- 208000028659 discharge Diseases 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229920002472 Starch Polymers 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 235000019698 starch Nutrition 0.000 description 6
- 239000008107 starch Substances 0.000 description 6
- 230000004087 circulation Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000000975 co-precipitation Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- -1 aluminum ion Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The treating agent for paper-making waste water is characterized by that every 100 tons of paper-making waste water is added with chemical coagulant in the range of 6-20 kg and flyash in the range of 350-5190 kg, and said treating process includes the steps of screening and discharging slag, recovering filter fibre, air-floating, mixing and stirring, precipitation, scraping slag and siphoning to discharge slag, and said treating agent possesses good effect for treating waste water, and can be used for effectively controlling COD and SS contents, and can be used for recovering and reusing pigment.
Description
The present invention relates to a kind ofly utilize the treatment agent of flyash Processing Paper Wastewater and utilize this treatment agent process for treating papermaking waste water.
At present, treatment agent with aluminium salt and flyash Processing Paper Wastewater, also only rest on theory stage, handle incompatible for large-scale paper waste, the patent No. is 97103899, name is called the method that contains aluminium salt and flyash sewage disposal coagulant and handle papermaking sewage and discloses a kind of sewage-treating agent, if but come Processing Paper Wastewater by this treatment agent, the waste water that comes out does not also reach environmental protection requirement, its pH value may all can not reach standard fully behind the content of its COD and SS and the waste water of processing, particularly pH value causes pH value higher because the ratio of aluminium salt is crossed conference; Longer according to its settled time of ratio Processing Paper Wastewater in addition, be not suitable for the actual production process of factory.
Traditional paper-making effluent treating process is diversified, the paper waste composition that with waste paper is paper making raw material is comparatively simple, the clearance general 70% of the waste water COD of process physical treatment course, the clearance of SS general 80%, as shown in Figure 1, it is the traditional technology of our factory at technological transformation pre-treatment paper waste, waste water COD after the processing, SS content can't reach environmental protection requirement, can not reclaim again and use, the processed waste water color is also darker, and waste discharge also will be paid sewage disposal expense to environmental administration; Adopt the process for treating papermaking waste water of flyash and aluminium salt to have in theory at present, its principle is to utilize iron contained in the flyash, aluminum ion to dissociate under acidic conditions to become the characteristic of inorganic coagulant, suspended substance particle in the sewage is flocculated, and coprecipitation, make pollutent and suspended substance and water sepn, utilize flyash to have the characteristic of activated carbon, slough coloring material in the water, thereby reduce the content of COD and SS; So adopt the Processing Paper Wastewater of flyash and aluminium salt to have following advantage: processing cost is low, and treatment effect is good, and the waste water after the processing decolours, and the content of COD and SS is controlled effectively, and can reclaim again and use; But the paper mill can't utilize this method Processing Paper Wastewater at present, because also there is main problem in the actual production: and about about 20,000 ten thousand to 30000 tons of the waste water of paper mill discharging every day of general scale, and the capacity of settling tank is limited, throw out in the settling tank must will go out settling tank clearly at set intervals, otherwise can influence following wastewater treatment, cause that the water COD, the SS's that discharge is seriously higher, factory can not stop again producing clearing up throw out earlier, and therefore the powdered coal cinder throw out of how in time clearing up in the settling tank becomes key; Factory also can not foundation can hold 20000 tons of settling tanks to 30000 tons of waste water and carries out primary treatment in addition, and therefore so output investment ratio is bigger, and general factory is difficult to bear, and also difficulty operates; The patent No. is 97103899, name is called the sewage-treating agent that contains aluminium salt and flyash and the method for processing papermaking sewage, this patent just discloses in paper waste and to have added aluminium salt and flyash thorough mixing and to obtain clear water through after a while coagulation, sedimentation and filtration, but is difficult to realize in actual production through this processing step of filtration; Still do not solve the above problems
The purpose of this invention is to provide a kind of technological process for the treatment of papermaking agent, its treatment effect is good, and cost is lower, and the sedimentary time of lime-ash is short, adapts to the requirement in factory's actual production.
Another object of the present invention provides that a kind of to utilize above-mentioned treatment agent to handle with waste paper be the technology of paper making raw material paper waste, it can solve the problem of the solid-liquid separation of flyash and water in the actual production preferably, and drop into little when transforming, treatment effect is good, the cost of handling waste water is low, can reach the recovery requirement of usefulness again, realize the best purpose of environmental protection, save process water.
Technological process for the treatment of papermaking agent of the present invention is made up of chemical coagulant and flyash, and its consumption is that the scope that adds chemical coagulant in the per 100 tons paper waste is that 6 kilograms to 20 kilograms, the scope of flyash are 350 kilograms to 5190 kilograms.
Above-mentioned described chemical coagulant can be Tai-Ace S 150 or aluminum chloride.
It is the technology of the paper waste of paper making raw material that the present invention utilizes above-mentioned treatment agent to handle with waste paper, and it mainly is made up of following step:
Step a) screening deslagging: utilize to account for and give birth to sieve with the bigger and water-fast slag of volume in the paper waste
Screen;
The step b) filter fiber reclaims: utilize garden net filtration machine that robust fibre is reclaimed;
Step c) air supporting: young staple fibre and the less mud of volume are separated;
Step d) is mixed stirring: the paper waste after the air supporting is added flyash and chemical coagulation according to the above ratio
Agent, and in the rapid reaction pond, mix, normal temperature and pressure stirs down fast, and then flows into slow
Stir at a slow speed in the speed reaction tank, enter horizontal sedimentation tank then.
The step e) precipitation; Waste water after steps d is handled heavy through after a while in horizontal sedimentation tank
Form sediment.
Step f) is scraped slag, siphon deslagging: utilize slag scraper that the throw out in the horizontal sedimentation tank is blown into lime-ash
In the siphon collection groove, utilize the pressure siphon of water to be discharged to lime-ash collection groove.
The present invention is that the further measure of the paper waste of paper making raw material is that the powdered coal cinder that obtains after handling through step f carries out secondary sedimentation and three precipitation process to handling with waste paper, and the waste water that overflows flows into the rapid reaction pond and enters next working cycle.
Technological process for the treatment of papermaking agent of the present invention compared with prior art has following advantage: when handling equal paper waste, because the consumption of flyash is appropriate, and the consumption of chemical coagulant is also suitable, the complete of waste water COD after the processing, SS can reach environmental protection requirement, and pH value is nearly neutrality, the cindery in addition settling time is short, the requirement of the production of the reality of adaptation factory.
Utilizing above-mentioned treatment agent to handle with waste paper among the present invention is the technology of the paper waste paper waste of paper making raw material, compared with prior art has following advantage: 1) pass through slag scraper, the siphon pipe successive is scraped slag and deslagging, solved the problem that the precipitation lime-ash is in time cleared up in the actual production, the method that makes flyash handle waste water can be implemented, COD in the water after handling and the content of SS are controlled effectively, through the flyash treating processes, the pigment of the waste water after the processing removes substantially, can reclaim again and use, in our factory's actual production process, because the continuous recovery of waste water after constantly will handling is used again, actual COD clearance has only about 40%～60%, but because the contained main component of waste water after handling is a starch, also to add starch in the paper-making process, so the content of COD is higher a little, do not influence normal paper; 2) carry out secondary, three precipitation process through contained waste water in the lime-ash of flyash treating processes discharge, the waste water that overflows enters next circulation, reaches the purpose of zero release, realizes the requirement of Environmental Protection Agency; 3) water after the processing of overflowing through the flyash treating processes can be each paper machine circulations usefulness again, can overflow in the general paper waste 80% can Recycling water, so saved process water, alleviated operational cost; 4) as shown in table 1, this table be utilize handle flyash and chemical coagulant day 20000 tons of paper wastes the working cost estimation, estimate through the our factory, about 5,700,000 yuan of our factories to the gross investment of flyash treating processes, daily handling ability is 36000 tons a paper waste, the required expense of annual operation is 2,070,000 yuan, and general annual 150000 the machine-made paper that produces in our factory, machine-made paper per ton only increases by 13.8 yuan of costs, about 0.292 yuan of the expense of average waste water per ton operation, it is lower therefore to invest cost less, Processing Paper Wastewater.
| Project | Unit consumption | Day is consumption always | Unit price | Working cost per ton | |
| ?1 | Flocculation agent | 0.08kg/t water | 1.6l/2 ten thousand t water | 860 yuan/t | 0.068 unit |
| ?2 | Depreciation funds | 600,000 yuan of year depreciations | Day depreciation 0.164 ten thousand | 0.082 unit | |
| ?3 | The extensive repair expense | Year is carried 600,000 yuan of overhaul expenses | Ri Tifei 0.164 ten thousand | 0.082 unit | |
| 4 electricity charge | 1608KW.h | 0.5 unit/kwh | 0.040 unit | ||
| 5 labor wage | 4 people | 1.2 ten thousand yuan of the moons | 0.04 ten thousand yuan | 0.020 unit | |
| 6 add up to | 0.292 unit | ||||
Table 1
Below in conjunction with accompanying drawing the present invention is done detailed explanation:
Fig. 1 is the technical process before our factory's technological transformation;
Fig. 2 is the present invention to being the schema of the paper-making effluent treating process of raw material with waste paper;
Fig. 3 is a concrete facility installation drawing of implementing flyash treating processes of the present invention;
Fig. 4 be traditional be the process flow sheet that the paper waste of raw material is handled with timber and careless class;
Principle of the present invention is: utilize flyash to have the characteristic of activated carbon, can play the effect of the aerobic substance in the absorption sewage, and then reduce the content of COD. In addition, contain iron, aluminium plasma in the flyash, it is dissociable under acid condition, can be with the solidifying wadding of suspension particle in the sewage and the co-precipitation of flyash particle, with pollutant and moisture from; Chemical coagulant can make the pollutant of paper waste form flco, but flco light weight when using separately, loose sinking speed is slow, although can reduce SS content, little to the effect of removing COD, if flyash, chemical coagulant synergy in paper waste, receive preferably result, not only solidifying wadding is fast, and the flco that forms is heavier, easily precipitation.
The paper waste of our factory is through after screening the step process such as deslagging, filter fiber recovery and air supporting, the content of COD probably reduces to 400～600mg/l by 1450mg/l, the content of SS is probably by reducing to 240～300mg/l about 1165mg/l, and then process with flyash, shown in table 2, table 3 (table 2, table 3 are experimental datas of our factory), a large amount of test by the our factory, can draw to draw a conclusion: 1) in the situation that does not add chemical coagulant, the large usage quantity of flyash, the time of sedimentation is longer, brings difficulty for large-scale processing; 2) the lime-ash precipitum after processing needs in time cleaning to discharge, otherwise the content of COD can go up, because the adsorption reaction of activated carbon is a reversible process; 3) the removal ability of COD reduces with the consumption of flyash and descends, and excessive chemical coagulant adds, and pH value is changed and increases cost, there is no need; Therefore the test by table 2, table 3 can draw when the sedimentation time is 25 minutes, and the flyash consumption is that each hundred tons of paper waste adds 350 kilograms, and when the consumption of aluminum sulfate was 8 kilograms, the clearance of COD was that the clearance of 59%, SS is more than 82%; In process of production, because the sedimentation time is longer, the clearance of COD and SS can improve, but because the continuous cycle for the treatment of of waste water is used again, the content of COD can accumulate rising, the clearance of COD in actual production probably only has 40%～60%, but after processing through flyash with short fiber and other sediment after powdered coal cinder is discharged, the COD main component is starch in can the waste water of Recycling, and decoloured, and also need to add a certain amount of starch in the paper production process, although so the content of the paper waste COD after processing up to 280 mg/l～400mg/l about, waste water circulation after treatment is again with not affecting actual paper production; According to the size of the COD clearance in the table 1 and the content of the COD of the waste water after allow processing up to 280mg/l～400mg/l about and the situation in our factory's actual production process, 350 kilograms of the minimum amount of the flyash in per 100 tons paper waste, the minimum amount of chemical coagulant is 6 kilograms, because the removal ability of COD increases with the consumption of flyash, so obtain from the data of table 2 and table 3, the highest consumption of the flyash in per 100 tons paper waste is 5190 kilograms, and the highest consumption of chemical coagulant is 20 kilograms. Therefore drawing waste water treating agent and be the scope that contains chemical coagulant in per 100 tons paper waste and be 6 kilograms to 20 kilograms, the scope of flyash is 350 kilograms to 5190 kilograms. Used chemical coagulant can be aluminum sulfate or alchlor.
| Numbering | Flyash consumption % | Addition of aluminum sulfate mg/l | Paper waste | Clear liquid after the sedimentation | Sedimentation time and sedimentation clear liquid water quality | The COD clearance | ||||
| COD mg/l | mg/l | PH | COD mg/l | SS mg/l | PH | |||||
| 1 | 5.19 | 80 | 382 | 702 | 6.0 | 59 | 77 | 6.0 | Sedimentation is as clear as crystal in the time of 10 minutes | 84％ |
| 2 | 2.59 | 80 | 382 | 702 | 6.0 | 69 | 79 | 6.0 | The same | 82％ |
| 3 | 1.73 | 80 | 382 | 702 | 6.0 | 84 | 80 | 6.0 | The same | 78％ |
| 4 | 0.92 | 80 | 263 | 184 | 6.0 | 20 | 80 | 6.0 | The same | 92％ |
| 5 | 0.88 | 80 | 121 | 130 | 6.0 | 15 | 32 | 6.0 | The same | 87％ |
| 6 | 0.7 | 80 | 121 | 130 | 6.0 | 25 | 35 | 6.0 | The same | 79％ |
| 7 | 0.58 | 80 | 169 | 160 | 6.0 | 54 | 42 | 6.0 | The same | 68％ |
| 8 | 0.39 | 80 | 158 | 86 | 6.0 | 102 | 56 | 6.0 | The same | 64％ |
| 9 | 0.38 | 80 | 194 | 223 | 6.0 | 82 | 59 | 6.0 | The same | 57％ |
| 10 | 0.35 | 80 | 204 | / | 6.0 | 100 | 45 | 6.0 | The same | 50％ |
| 11 | 0.35 | 80 | 204 | / | 6.0 | 82 | 40 | 6.0 | Sedimentation is as clear as crystal in the time of 25 minutes | 60％ |
| 12 | 0.32 | 80 | 255 | 105 | 6.0 | 112 | 52 | 6.0 | Sedimentation is as clear as crystal in the time of 10 minutes | 56％ |
| 13 | 0.29 | 80 | 425 | 337 | 6.0 | 141 | 76 | 6.0 | The same | 66％ |
| 14 | 0.28 | 80 | 235 | 173 | 6.0 | 132 | 50 | 6.0 | The same | 43％ |
| 15 | 0.27 | 80 | 224 | 129 | 6.0 | 117 | 66 | 6.0 | The same | 47％ |
| 16 | 3.79 | 0 | 243 | 247 | 6.0 | 61 | 352 | 6.0 | Sedimentation is muddiness in the time of 10 minutes | 75％ |
| 17 | 3.79 | 0 | 243 | 247 | 6.0 | 61 | 323 | 6.0 | Sedimentation is muddiness in the time of 20 minutes | 75％ |
| 18 | 2.59 | 0 | 283 | 392 | 6.0 | 80 | 44 | 6.0 | Sedimentation is limpid in the time of 4 hours | 72％ |
Table 2
| Numbering | Flyash consumption % | Addition of aluminum sulfate mg/l | Paper waste | Clear liquid after the sedimentation | Sedimentation time and sedimentation clear liquid water quality | ||||
| COD mg/l | mg/l | PH | COD mg/l | SS mg/l | PH | ||||
| 19 | 1.16 | 0 | 182 | 141 | 6.0 | 50 | 55 | 6.0 | Sedimentation is some muddiness in the time of 1 hour |
| 20 | 1.16 | 0 | 182 | 141 | 6.0 | 50 | 185 | 6.0 | Sedimentation is the grey muddiness in the time of 30 minutes |
| 21 | 0.4 | 0 | 204 | 231 | 6.0 | 112 | 194 | 6.5 | Sedimentation is the grey muddiness in the time of 1 hour |
| 22 | 0.39 | 0 | 250 | 243 | 6.0 | 194 | 186 | 6.0 | Sedimentation is the grey muddiness in the time of 10 minutes |
| 23 | 5.85 | 600 | 273 | 130 | 6.5 | 40 | 60 | 4.0 | Sedimentation is as clear as crystal in the time of 10 minutes |
| 24 | 3.68 | 300 | 141 | 160 | 6.0 | 30 | 64 | 5.0 | Sedimentation is as clear as crystal in the time of 10 minutes |
| 25 | 3.35 | 200 | 263 | 116 | 6.0 | 30 | 74 | 6.0 | The same |
| 26 | 3.81 | 160 | 303 | 125 | 6.0 | 30 | 75 | 6.0 | The same |
| 27 | 2.45 | 120 | 328 | 140 | 6.0 | 40 | 73 | 6.0 | The same |
| 23 | 5.56 | 80 | 223 | 146 | 7.0 | 20 | 86 | 7.0 | The same |
| 29 | 0.56 | 60 | 240 | 109 | 6.0 | 61 | 51 | 6.0 | Sedimentation is just as clear as crystal in the time of 30 minutes |
| 30 | 0.53 | 80 | 245 | 90 | 6.0 | 122 | 46 | 6.0 | Sedimentation is limpid slag mixing secondary in the time of 10 minutes |
| 31 | 0.36 | 80 | 275 | 116 | 6.0 | 133 | 47 | 6.0 | Sedimentation is limpid slag mixing secondary in the time of 10 minutes |
| 32 | 0.34 | 80 | 255 | 182 | 6.0 | 153 | 50 | 6.0 | Sedimentation in the time of 10 minutes limpid slag mix three times |
Table 3
Embodiment 1: as shown in Figure 2, be that our factory's processing is the sewage treatment technology process figure of paper making raw material papermaking with waste paper, it is made up of following steps:
Step a) screening deslagging: utilize to account for and give birth to sieve with the bigger and water-fast slag of volume in the paper waste
Screen;
The step b) filter fiber reclaims: utilize garden net filtration machine that robust fibre is reclaimed;
Step c) air supporting: young staple fibre and the less mud of volume are separated;
Step d) is mixed stirring: the paper waste after the air supporting is added flyash and chemical coagulation according to the above ratio
Agent, and in the rapid reaction pond, mix, normal temperature and pressure stirs down fast, and then flows into slow
Stir at a slow speed in the speed reaction tank, enter horizontal sedimentation tank then;
The step e) precipitation; Waste water after steps d is handled heavy through after a while in horizontal sedimentation tank
Form sediment.
Step f) is scraped slag, siphon deslagging: utilize slag scraper that the throw out in the horizontal sedimentation tank is blown into lime-ash
In the siphon collection groove, utilize the pressure siphon of water to be discharged to lime-ash collection groove.
The invention process is above-mentioned utilize the flyash Processing Paper Wastewater technology, special corresponding apparatus is set to step f for steps d, as shown in Figure 3, this equipment is by rapid reaction pond 1, slow reaction pond 2, horizontal sedimentation tank 3, lime-ash siphon collection groove 4, siphon pipe 5, lime-ash collection groove 6, flow-stopping plate 7, scum silica frost collection groove 8, slag scraper is installed on horizontal sedimentation tank, on the siphon pipe 5 by-pass valve control is installed, rapid reaction pond 1, slow reaction pond 2 respectively are equipped with stirrer; Below be the processing parameter of each equipment:
The specification in rapid reaction pond 1: diameter is 2500mm, high 3650mm, the about 14～25m of waste water throughput
3/ second, the about per minute 50～60 of stirrer rotating speed changes about 40～60 seconds of the reaction times of chemical coagulant, a and paper waste.
Slow reaction pond 2 specification: diameter is 4000mm, high 3650mm,, the about 14～25m of waste water throughput
3/ second, the about per minute 20～30 of stirrer rotating speed changes about 120～150 seconds of the reaction times of chemical coagulant, a and paper waste.
The long 36000mm of specification of the specification 3 of horizontal sedimentation tank, wide 12000mm, high 3650mm, 12000 tons/day of wastewater treatment capacity, 2 hours 20 minutes to 3 hours 20 minutes residence time of waste water.
Siphonal specification is 2 cun, and each pond is with 18, and flow is controlled with flow valve; Rotating speed 0.8～1.0m/ branch of slag scraper.
Paper waste is by after screening step process such as deslagging, filter fiber recovery and air supporting, the content of COD is probably by reducing to about 1450mg/l about 400mg/l～600mg/l, the content of SS is probably by reducing to about 1165mg/l about 240mg/l～400mg/l, in our factory's actual production, day handle waste water and be about 20000 tons, the about 3000m of its flow of flyash
3/ day, mean concns 3.5%, over dry ash amount is 100～105 ton per days, after the flyash processing, because waste water constantly circulates in usefulness after treatment, the clearance of COD has only 40%～60%, but after handling through flyash with staple fibre and other throw out after powdered coal cinder is discharged, the COD main component is a starch in can the waste water of Recycling, and decoloured, and also need to add a certain amount of starch in the paper process, so though the content of the paper waste COD after handling up to 280mg/l～400mg/l about, reclaim again with after still do not influence actual paper; After the flyash processing, because the clearance of SS is higher, so generally can reach environmental protection requirement.
The waste water of an air flotation pool part flows into the rapid reaction pond during work, and another part pours the rapid reaction pond with flyash, and flyash is a that comes out after the electricity generation boiler from the our factory burns, the about 3000m of its flow
3/ day, mean concns 3.5%, over dry ash amount is 100～105 ton per days, chemical coagulant is from flowing into the rapid reaction pond, consumption is per minute 0.8kg to 1.4kg, chemical coagulant, 1 stir about flows into slow reaction pond 2 after 40～60 seconds in the rapid reaction pond for flyash and paper waste, chemical coagulant, 2 stir abouts flow into horizontal sedimentation tank 3 after 120～150 seconds in the slow reaction pond for flyash and paper waste, stirring by rapid reaction pond 1 and slow reaction pond 2 makes chemical coagulant, a and paper waste thorough mixing, paper waste probably stays in horizontal sedimentation tank 3 about 2 hours 20 minutes to 3 hours 20 minutes, and in the horizontal sedimentation tank 3 slag scraper general each hour scrape slag once, when slag scraper when moving left, scum silica frost is blown into scum silica frost receiving tank 8 the insides, when slag scraper when moving left, the precipitation lime-ash of the bottom of horizontal sedimentation tank 3 is scraped lime-ash siphon collection groove 4 the insides, during control valve on opening siphon pipe 5, the gravity that utilizes water in the horizontal sedimentation tank 3 is siphoned into lime-ash collection groove 6 with the lime-ash of lime-ash siphon collection groove 4 the insides, the scum silica frost of scum silica frost receiving tank 8 the insides also flow into lime-ash collection groove 6 the insides, water in the horizontal sedimentation tank 3 overflows and flows to the clean water basin the inside, utilizes pump that clear water is transported to each paper machine then and uses.
The chances are about 3%～6% in the general concentration of lime-ash of lime-ash collection groove 6 the insides, if day output is 20000 tons of paper wastes, about 105 tons of the lime-ash that need discharge, then discharge about about 1600～3400 tons of the needed water of lime-ash, in order not allow this a large amount of water flow into rivers, in secondary lime-ash settling tank, carry out precipitation process by pump delivery, the waste water that overflows is through water collecting basin, flow to three buck settling tanks again and carry out the primary sedimentation processing again, the waste water that overflows from three buck settling tanks flows into the rapid reaction pond and enters next circulation, so realize the closed circulation processing basically, sewage is no longer discharged rivers.
The present invention makes full use of a that comes out after the burning of our factory electricity generation boiler, be used for Processing Paper Wastewater, the treatment of wastes with processes of wastes against one another reduces the cost that moves, and the technology gross investment of flyash treating processes is more than 500 ten thousand yuan in addition, working cost is also lower, about 0.292 yuan of wastewater treatment expense per ton, and the waste water after handling can reclaim usefulness again, and compliance with environmental protection requirements fully, in order to reduce to pollute as far as possible, the our factory realizes zero release basically.
Embodiment 2: as shown in Figure 4, to being the resulting paper waste of raw material papermaking with timber and careless class, the present invention adopts following technology: it comprises pretreatment process, one-level treatment process and second-stage treatment operation, and it also comprises the flyash treatment process in addition.To being the resulting paper waste of papermaking (being commonly called as black liquor) of paper making raw material with timber and careless class, its contained composition is complicated, must carry out alkali earlier and reclaim pre-treatment again, one-level processing, second-stage treatment or tertiary treatment; But for the tertiary treatment process, because investment is bigger, the actual mechanical process complexity, so dispense the tertiary treatment process, but probably also want more than 5,000 ten thousand with regard to present treating processes gross investment, but the waste water COD content after handling is still up to about 450mg/l, SS content is probably about 300mg/l, and not decolouring of the waste water after handling, and color is darker, reach national secondary discharge standard reluctantly, processed waste water can not Recycling, and causes will paying 6 to 70,000 expense to Environmental Protection Agency in every month because of discharging waste water, so effect is also not very very good, flyash treating processes of the present invention is replaced traditional tertiary treatment process, because the investment of flyash treating processes is less, treatment effect is better, and working cost is less, and the pigment of the waste water after handling removes substantially, and can reclaim usefulness again, reduced the expense of operation greatly.
Claims (4)
1, a kind of technological process for the treatment of papermaking agent is characterized in that it is made up of chemical coagulant and flyash, and its consumption is that the scope that adds chemical coagulant in the per 100 tons paper waste is that 6 kilograms to 20 kilograms, the scope of flyash are 350 kilograms to 5190 kilograms.
2, technological process for the treatment of papermaking agent according to claim 1 is characterized in that described chemical coagulant can be Tai-Ace S 150 or aluminum chloride.
3, utilizing the described treatment agent of claim 1 to handle with waste paper is the technology of the paper waste of paper making raw material, is characterised in that it mainly is made up of following steps:
Step a) screening deslagging: utilize to account for and give birth to sieve with the bigger and water-fast slag of volume in the paper waste
Screen;
The step b) filter fiber reclaims: utilize garden net filtration machine that robust fibre is reclaimed;
Step c) air supporting: young short fiber is only separated with the less mud of volume;
Step d) is mixed stirring: the paper waste after the air supporting is added flyash and chemical coagulation according to the above ratio
Agent, and in the rapid reaction pond, mix, normal temperature and pressure stirs down fast, and then flows into slow
Stir at a slow speed in the speed reaction tank, enter horizontal sedimentation tank then.
The step e) precipitation; Waste water after steps d is handled heavy through after a while in horizontal sedimentation tank
Form sediment.
Step f) is scraped slag, siphon deslagging: utilize slag scraper that the throw out in the horizontal sedimentation tank is blown into lime-ash
In the siphon collection groove, utilize the pressure siphon of water to be discharged to lime-ash collection groove.
4, flyash process for treating papermaking waste water according to claim 3 is characterized in that carrying out secondary sedimentation and three precipitation process through the powdered coal cinder that obtains after the step f processing, and the waste water that overflows flows into the rapid reaction pond and enters next working cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991171802A CN1157342C (en) | 1999-10-29 | 1999-10-29 | Method for treating papermaking wastewater by using fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991171802A CN1157342C (en) | 1999-10-29 | 1999-10-29 | Method for treating papermaking wastewater by using fly ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1265378A true CN1265378A (en) | 2000-09-06 |
| CN1157342C CN1157342C (en) | 2004-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991171802A Expired - Fee Related CN1157342C (en) | 1999-10-29 | 1999-10-29 | Method for treating papermaking wastewater by using fly ash |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102730780A (en) * | 2011-04-09 | 2012-10-17 | 上海东冠纸业有限公司 | Apparatus for processing and recycling cleaned sewage |
| CN102964030A (en) * | 2012-11-16 | 2013-03-13 | 富阳春江污水回用处理有限公司 | Novel waste paper papermaking waste water comprehensive treatment method and system |
| CN107381700A (en) * | 2017-08-22 | 2017-11-24 | 西安建筑科技大学 | A kind of multistage ozone air-float technique slag-draining device based on siphon principle |
| CN109354309A (en) * | 2018-11-07 | 2019-02-19 | 环境保护部华南环境科学研究所 | Heavy metal MULTIPLE COMPOSITE treatment process for industrial wastewater |
| CN114573150A (en) * | 2022-04-02 | 2022-06-03 | 淄博新华纸业有限公司 | Papermaking sewage treatment process |
-
1999
- 1999-10-29 CN CNB991171802A patent/CN1157342C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102730780A (en) * | 2011-04-09 | 2012-10-17 | 上海东冠纸业有限公司 | Apparatus for processing and recycling cleaned sewage |
| CN102964030A (en) * | 2012-11-16 | 2013-03-13 | 富阳春江污水回用处理有限公司 | Novel waste paper papermaking waste water comprehensive treatment method and system |
| CN102964030B (en) * | 2012-11-16 | 2014-08-27 | 富阳春江污水回用处理有限公司 | Novel waste paper papermaking waste water comprehensive treatment method and system |
| CN107381700A (en) * | 2017-08-22 | 2017-11-24 | 西安建筑科技大学 | A kind of multistage ozone air-float technique slag-draining device based on siphon principle |
| CN107381700B (en) * | 2017-08-22 | 2020-12-01 | 西安建筑科技大学 | Multi-stage ozone air flotation process deslagging device based on siphon principle |
| CN109354309A (en) * | 2018-11-07 | 2019-02-19 | 环境保护部华南环境科学研究所 | Heavy metal MULTIPLE COMPOSITE treatment process for industrial wastewater |
| CN109354309B (en) * | 2018-11-07 | 2021-11-12 | 环境保护部华南环境科学研究所 | Heavy metal multiple composite treatment process for industrial wastewater |
| CN114573150A (en) * | 2022-04-02 | 2022-06-03 | 淄博新华纸业有限公司 | Papermaking sewage treatment process |
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| Publication number | Publication date |
|---|---|
| CN1157342C (en) | 2004-07-14 |
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