CN1144781A - Harnessing method for papermaking waste water - Google Patents
Harnessing method for papermaking waste water Download PDFInfo
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- CN1144781A CN1144781A CN 96115888 CN96115888A CN1144781A CN 1144781 A CN1144781 A CN 1144781A CN 96115888 CN96115888 CN 96115888 CN 96115888 A CN96115888 A CN 96115888A CN 1144781 A CN1144781 A CN 1144781A
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Abstract
A process for treating waste paper-making liquid includes such steps as filtering black liquor and intermediate water before bleaching by micro-net filter to recover paper pulp, mixing in first mixing pool, addition of acid while sending to air floating reaction pool, separation of lignin in air-floating reactor, mixing in second mixing pool, filtering with special filter in filtering pool, adding lime milk, precipitation in settling pool, addition of flocculant and lime milk, settling mud in settling pool, and discharging or reusing the water after settling out of mud.
Description
The present invention relates to wastewater treatment, relate in particular to the improvement method of waste water in the paper industry production.
Prior art is administered black liquid and middle section water, what technical comparison was successful is large-scale wood pulp papermaking enterprise (annual production is more than 200,000 tons), but because its complex process, device is worth expensive, the operational requirement strictness, investment is big, the working cost height, thereby, be unsuitable for medium and small papermaking straw pulp enterprise and use.
At present, medium and small papermaking enterprise is only limited to individual event improvement to black liquid and middle section water, as:
1, to the improvement of black liquid:
(1) combustion method alkali reclaims: it is 200,000 tons wood pulp factory that this treatment process is used for yearly capacity in the world, and technical maturity is reliable, and favorable economic benefit is arranged.The domestic yearly capacity that also is useful on is 30,000 tons a straw pulp mill, it is administered black liquor and also obtains certain effect, but for numerous yearly capacities is about ten thousand tons or the straw pulp mill of more small-scale production ability, adopt alkali recovery technology to administer black liquor and many problems occur, because the straw pulp black liquor silicone content is higher, viscosity is big, have influence on black liquor vaporizing, concentrate and incendiary normally moves, add that the straw pulp pulp washing is than wood pulp difficulty, water consumption is big, so the black liquor very rare (reaching 1 ° of Be) that obtains, the energy consumption of evaporating is big especially.In addition, alkali charge is lower than wood pulp during the straw pulp boiling, total alkali nature in the black liquor solid is less than wood pulp, facility with same scale comes the alkali of straw pulping black liquor acquisition greatly to reduce than pulp black liquor, and the calorific value of straw pulp black liquor solid substance is lower than wood pulp, burn and also need extra fuel (as heavy oil etc.) roasting when bad, deficiency in economic performance, with regard to construction investment between different scales alkali recovery vehicle, producing 30 tons of slurries daily needs supporting alkali recycling engineering to invest 4,000 ten thousand yuan, produce 50 tons of slurries daily and need 6,000 ten thousand yuan, produce 9,000 ten thousand yuan of 75 tons of need daily, produce 12,000 ten thousand yuan of 100 tons of need daily.Big like this investment is difficult to realize to numerous medium and small paper mills.
(2) evaporation concentration is produced xylogen: this resolution gross investment is reclaimed low than combustion method alkali, can eliminate black liquor pollution, but the expense of evaporation concentration is very high, and because wheat straw silicon content height makes fouling of evaporator serious, causes damage the continuous operation difficulty easily.
(3) SO
2Resource utilization reclaims: this treatment process makes that the xylogen resource has obtained sufficient recycling in the black liquor, lignin product quality height, but because SO
2Can not make the black liquor pH value reach lower numerical value, thereby the extraction yield of lignin is low, next sulphur that burns produces SO
2, cause topsoil possibly.
(4) heating lignin acidizing separation method: alkali lignin generally only is dissolved in the alkali solution of PH＞9, and when PH＜5, lignin is separated out from solution, and the advantage of this method is that construction investment is few, and lignin extraction yield height is simple to operate.Shortcoming is just can reach satisfied separating effect in the time of must black liquor being heated to certain temperature with steam, thereby makes running cost higher.In addition, the extraction of lignin and dehydration difficulty.
(5) normal temperature auxiliary agent lignin acidizing separation method: extract lignin with acid-precipitation method at normal temperatures, need when adding acid, to add a certain amount of auxiliary agent, lignin is separated, but fluctuation of service is difficult to be applied to scale production, and the extraction of lignin and dehydration difficulty.
2, the improvement of middle section water:
Processing to intermediate water of papermaking mainly contains anaerobic digestion and biochemistry---flocculence.Because the intermediate water of papermaking water yield is big, but it is relatively low to include the biological amount, causes above two kinds of methods effect in industrial production relatively poor, and can not satisfy the discharge of wastewater requirement.
The purpose of this invention is to provide a kind of engineering control less investment, applied widely, stable continuously, running cost is low and can not produce the improvement method of the paper waste of secondary pollution.
Purpose of the present invention can realize by following measure:
Under the prerequisite of the present invention discharge of wastewater rule and water quality complicacy in taking into full account the paper mill production process, recycling from paper waste, with the black digestion liquid in the paper waste with float before the middle section water elder generation merga pass the first step administer, middle section water is mixed into the improvement of second step with floating afterwards with it again, the mixing paper waste of administering through second step can reach emission standard but instability, can carry out for the 3rd step for this reason again and administer.Concrete improvement method several steps in the following order carries out:
The black digestion liquid that to remove inorganic impurities such as sandstone, earth through settling pit with float before middle section water send first mixing pit to mix after reclaiming paper pulp by the microgrid filter, control two kinds of waste water mixing afterwards pH values be 6～11.The mesh of used microgrid filter is: black digestion liquid 40～60 orders/cm
2, middle section water 60～90 orders before floating/cm
2
Mixing water adds acid in sending into air supporting reaction tank process, control mixing water pH value is 2～5.Xylogen in the mixing water is separated out at this moment, by internal-circulation type jet pressurized dissolved air flotation method (ordinary method) xylogen is separated from water then, concentrates and does the dehydration and drying processing.
To remove acid that middle section water after the floating of inorganic impurities such as sandstone in the waste water, earth reclaims waste water behind the paper pulp and mixing water through isolating xylogen and adding by the microgrid filter through settling pit and advance second mixing pit and mix, the pH value of control mixing water is 2～4.The mesh of used microgrid filter is 60～100 orders/cm
2
Mixing water filters organism and solid particulate through extraordinary filtrate contact filter.The filtrate of this extraordinary filtrate contact filter is double-deck, is made of hard coal particle diameter 1.0～3.5mm wherein, the thick 200～700mm of filtering layer, iron filings particle diameter 0.5～7.0mm, the thick 300～1200mm of filtering layer, filter tank filtering velocity 5～11m/h hard coal grain and iron filings.Mixing water excites the iron filings ejected electron, produce the active iron ion and be free in the mixing water, and with mixing water in the organism complexing that attracts each other.Sending in the first rectangular sedimentation tank process to after filtering mixing water to add milk of lime, the control pH value is 7～10 again.In this course, (OH) in the milk of lime
-Produce reaction with free active iron ion in the mixing water:
The supernatant liquor that is settled out mud at first adds flocculation agent in sending the second rectangular sedimentation tank process, the control pH value is 5～6.5, and then adding milk of lime control pH value is 7～9, forms Al (OH) this moment in mixing water
3Throw out:
Hydrolysis
Be settled out the water discharging of mud or the use that refluxes.
Purpose of the present invention also can realize by following measure:
Aforesaid flocculation agent is preferred version with the alum liquor.
In the air supporting reaction tank, advance first rectangular sedimentation tank and advance in the course of conveying of second rectangular sedimentation tank to add coagulant aids respectively, its add-on respectively is 12～20PPM, 15～25PPM and 12～15PPM, so that separate out the flocculating result that xylogen forms big flocs unit and strengthens ironic hydroxide and aluminium hydroxide.
Aforesaid coagulant aids is preferred with the polyacrylamide.
The mud 40-60% amount that is settled out through second rectangular sedimentation tank is used as the mud backflow, and rest part send sludge drying bed to handle.
The water that is settled out mud through second rectangular sedimentation tank filters the back discharging or the use that refluxes by sand filter.
Aforesaid acid is meant spent acid commonly used in the production; Be preferred version wherein with sulfur waste acid.
The present invention compared with prior art has following advantage:
1, present method reduced investment is simple to operate, and is stable, 20,000 tons slurry/year production-scale paper plant handle ten thousand yuan of waste water construction investment 400-500 with this method.
2. equipment is easy to purchase and the maintenance management convenience.
3, running cost is low, every processing 1m
3Waste water, running cost 0.45-0.85 unit.
4, can reach the thorough governance for reaching standard of whole paper wastes, and not resemble the improvement that additive method is confined to black liquor or middle section water.
5, in administering the waste water process, fully recycle resource, and accomplish to turn harm into good the treatment of wastes with processes of wastes against one another, turn waste into wealth.
6, present method does not produce any secondary pollution in operational process.
7, fully guarantee waste water treatment result's stable and high quality.
No matter 8 paper plant's industrial scale sizes, present method all are suitable for, and in service making ends meet, surplus is still arranged, and the big more benefit of scale is remarkable more.
9, present method has been compared following innovation and breakthrough with present existing lignin acidizing separation method.
Changing precipitate and separate xylogen or chemical dissolved air flotation xylogen is internal-circulation type jet pressurized dissolved air flotation method, adopt present method to overcome the precipitator method and separate length consuming time, separate not thorough, the shortcoming of the low dehydration difficulty of lignin concentration, more avoid the come-up naturally of chemical air supporting method to be subjected to temperature and operating influence big, can not guarantee the rough sledding that xylogen floats fully.With present method Separation and Recovery xylogen, not only thorough, lignin concentration's height, dehydrate easily, and, the factors such as not being subjected to temperature of separating out of xylogen disturbed owing to grasped pH value before optimal coagulant dose, dispensing concentration and the waste water air supporting, can finish in back 2 minutes in dispensing and separate out flocculation process.Dosage is lower 2-3 times than the precipitator method and chemical air supporting method.Gained xylogen quality obviously is better than additive method, and this deep processing for xylogen provides assurance.
10, the extraordinary filtrate contact filter of present method employing, the filter tank is played hold back adsorb organic compound and the dual function that produces active ion, a filter tank replaces an active ion pharmaceutical factory, thing and easy and simple to handle saves money, in service because of having selected suitable particle diameter of filter medium, make filtering velocity higher, guaranteed the practicality of this cover facility in fairly large production.
11, present method has creatively adopted " nonactive mud circumfluence method ", has promptly improved treatment effect, has reduced dosage, has reduced the mud generation again.
12, present method is used in combination traditional flocculant Tai-Ace S 150 with milk of lime, not only reaches organic purpose in the absorption waste water, and can remove look, has finally solved the paper waste problem that color is difficult to remove after materialization and biochemical process processing.
Fig. 1 is a process flow sheet of the present invention.
Embodiment:
With black digestion liquid with float before middle section water and float the back middle section water and remove inorganic impurities such as sandstone the waste water, earth from the workshop branch settling pit of flowing through, reclaim paper pulp by the microgrid filter.The used mesh of microgrid filter: black digestion liquid 50 orders/cm
2, middle section water 70 orders before floating/cm
2, float back middle section water 80 orders/cm
2Send first mixing pit to mix with floating preceding middle section water black liquor then, the control pH value is 8.Again mixing water is used pumping air supporting reaction tank, in the pumping process, add sulfur waste acid (spent acid commonly used in the production), the control pH value is 3, drop into polyacrylamide (dosage 15PPM) again, the flocs unit that forms is separated from water by the internal-circulation type jet pressurized dissolved air flotation method of routine, and the back is concentrated and done the dehydration and drying processing.
The float back middle section water of the mixing water of isolating xylogen after the microgrid filter reclaims paper pulp advances second mixing pit with the acid of adding and mixes, and controlling mixed water ph value is 3.
With pump the mixing water of second mixing pit is sent into extraordinary filtrate contact filter and filter, filtrate is double-deck, is made of hard coal particle diameter 1.5MM, the thick 400MM of filtering layer, iron filings particle diameter 4.0MM, the thick 700MM of filtering layer, filter tank filtering velocity 8M/h no coal grain and iron filings.After filtration, a part of organism and solid particulate are dammed.Send first rectangular sedimentation tank with water after filtering then, at first add milk of lime in course of conveying, control waste water pH value is 8, adds polyacrylamide (add-on 20PPM) then.
Supernatant liquor through being settled out mud in the pumping process, at first adds alum liquor with being pumped into second rectangular sedimentation tank, and the control pH value is 5.5, and then adds milk of lime, and the control pH value is 8, adds polyacrylamide (add-on 14PPM) simultaneously again.
Second rectangular sedimentation tank is settled out 50% of sludge quantity does the mud backflow, all the other send sludge drying bed to handle.The water that is settled out mud through this settling tank filters the back discharging or the use that refluxes by sand filter.
Claims (8)
1, a kind of improvement method of paper waste is characterized in that several steps in the following order carries out:
---with black digestion liquid with float before middle section water after the microgrid filter reclaims paper pulp, send first mixing pit to mix, the mixing water pH value is 6～11;
---mixing water adds acid in the floating reaction tank process of supplying gas, control mixing water pH value is 2～5;
---by internal-circulation type jet pressurized dissolved air flotation method separating lignin from water;
---the mixing of second mixing pit is advanced in the mixing water and the acid of floating back middle section water and adding behind microgrid filter recovery paper pulp of isolating xylogen, and the mixing water pH value is 2～4;
---mixing water filters organism and solid particulate through extraordinary filtrate contact filter;
---the mixing water to is after filtering sending in the first rectangular sedimentation tank process and is adding milk of lime, and the control pH value is 7～10;
---the supernatant liquor that is settled out mud at first adds flocculation agent in sending the second rectangular sedimentation tank process, the control pH value is 5～6.5; Then add milk of lime, the control pH value is 7-9;
---be settled out the water discharging of mud or the use that refluxes.
2, the improvement method of a kind of paper waste according to claim 1 is characterized in that described flocculation agent is an alum liquor.
3, the improvement method of a kind of paper waste according to claim 1, it is characterized in that in the air supporting reaction tank, advance first rectangular sedimentation tank and advance in the course of conveying of second rectangular sedimentation tank to add coagulant aids respectively that its add-on respectively is 12～20PPM, 15～25PPM and 12～15PPM
4, the improvement method of a kind of paper waste according to claim 3 is characterized in that said coagulant aids is a polyacrylamide.
5, the improvement method of a kind of paper waste according to claim 1, the mud 40-60% that it is characterized in that being settled out through second rectangular sedimentation tank amount is done mud and is refluxed.
6, the improvement method of a kind of paper waste according to claim 1 is characterized in that the water that is settled out mud through second rectangular sedimentation tank filters the back discharging or the use that refluxes by sand filter.
7, the improvement method of a kind of paper waste according to claim 1 is characterized in that said acid is meant spent acid commonly used in the production.
8, the improvement method of a kind of paper waste according to claim 7 is characterized in that said spent acid is meant sulfur waste acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96115888 CN1057512C (en) | 1996-07-12 | 1996-07-12 | Harnessing method for papermaking waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96115888 CN1057512C (en) | 1996-07-12 | 1996-07-12 | Harnessing method for papermaking waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1144781A true CN1144781A (en) | 1997-03-12 |
| CN1057512C CN1057512C (en) | 2000-10-18 |
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ID=5123096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96115888 Expired - Fee Related CN1057512C (en) | 1996-07-12 | 1996-07-12 | Harnessing method for papermaking waste water |
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| Country | Link |
|---|---|
| CN (1) | CN1057512C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100358811C (en) * | 2003-08-26 | 2008-01-02 | 山东泉林纸业有限责任公司 | Process for extracting lignin by acid separation |
| CN102730876A (en) * | 2011-04-14 | 2012-10-17 | 富阳市清园城市综合污水处理有限公司 | Advanced treatment process for papermaking wastewater |
| CN103172212A (en) * | 2011-12-26 | 2013-06-26 | 济南圣泉集团股份有限公司 | Treatment method of lignin production waste water |
| CN109665656A (en) * | 2019-01-09 | 2019-04-23 | 广州嘉康环保技术有限公司 | A kind of removal technique of cowboying sewage middle short fiber lignin |
| CN113584931A (en) * | 2021-08-03 | 2021-11-02 | 东莞顺裕纸业有限公司 | Corrugated paper production process with less waste liquid discharge |
| CN114890593A (en) * | 2022-04-08 | 2022-08-12 | 江苏济冠通环保科技股份有限公司 | Method for treating papermaking industrial wastewater |
-
1996
- 1996-07-12 CN CN 96115888 patent/CN1057512C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100358811C (en) * | 2003-08-26 | 2008-01-02 | 山东泉林纸业有限责任公司 | Process for extracting lignin by acid separation |
| CN102730876A (en) * | 2011-04-14 | 2012-10-17 | 富阳市清园城市综合污水处理有限公司 | Advanced treatment process for papermaking wastewater |
| CN102730876B (en) * | 2011-04-14 | 2014-01-15 | 富阳市清园城市综合污水处理有限公司 | Advanced treatment process for papermaking wastewater |
| CN103172212A (en) * | 2011-12-26 | 2013-06-26 | 济南圣泉集团股份有限公司 | Treatment method of lignin production waste water |
| CN109665656A (en) * | 2019-01-09 | 2019-04-23 | 广州嘉康环保技术有限公司 | A kind of removal technique of cowboying sewage middle short fiber lignin |
| CN113584931A (en) * | 2021-08-03 | 2021-11-02 | 东莞顺裕纸业有限公司 | Corrugated paper production process with less waste liquid discharge |
| CN114890593A (en) * | 2022-04-08 | 2022-08-12 | 江苏济冠通环保科技股份有限公司 | Method for treating papermaking industrial wastewater |
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| Publication number | Publication date |
|---|---|
| CN1057512C (en) | 2000-10-18 |
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