CN1203231C - Waste-liquid treatment method for straw pulp paper-making - Google Patents
Waste-liquid treatment method for straw pulp paper-making Download PDFInfo
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- CN1203231C CN1203231C CN 02100662 CN02100662A CN1203231C CN 1203231 C CN1203231 C CN 1203231C CN 02100662 CN02100662 CN 02100662 CN 02100662 A CN02100662 A CN 02100662A CN 1203231 C CN1203231 C CN 1203231C
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- black liquor
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Abstract
The present invention relates to a sewage treatment method for making paper from straw pulp. In order to overcome the defects in the prior art of high running cost and inexhaustive extraction of black liquid, the present invention provides a sewage treatment method which has the advantages that the running cost is low and the sewage can reach the standard to be drained. The present invention comprises the steps: raw materials for making paper by straw pulp are conveyed into a spherical boiler to be cooked to produce primary pulp; black liquid is extracted from the primary pulp through squeezing equipment three times; the primary pulp from which the black liquid is extracted is conveyed to a pulp making step to make pulp, the output white water passes through an inclined net filtering device, paper pulp fibers are collected, and the filtered white water enters a water collecting pool; a flocculating agent is added to the water collecting pool, and is pumped into a super superficial layer air flotation device; simultaneously, the aeration is implemented, and a coagulant aid is added; floating slag collected by the super superficial layer air flotation device passes through a concentration pool and a paper pulp pool to be agitated to a sludge pool, and the residual clear water can be directly drained or recycled. The method has the advantages that the extraction rate of black liquid is high, the investment for treating middle section water is little, the running cost in the whole technological process is low, the treatment is thorough, and the sewage can stably reach the standard to be drained.
Description
Technical field
The present invention relates to a kind of sewage water treatment method, especially a kind of sewage water treatment method of papermaking straw pulp.
Background technology
Paper industry is one of comparatively serious industry of environmental pollution, and it mainly pollutes the various waste water that produce from pulping and papermaking processes.
To the processing that pulping and paper-making pollutes, each producer has all taked different measure both at home and abroad.Understand according to investigations, they are administered thoroughly, compliance with environmental protection requirements.But the most important thing is because of administering operating cost very highly, make papermaking enterprise normally stable operation and the main cause that causes waste water can not stably reaching standard to discharge.
Summary of the invention
The purpose of this invention is to provide that a kind of operating cost is low, the method for sewage disposal that can qualified discharge.
The method of papermaking straw pulp sewage disposal of the present invention comprises the steps:
1. the papermaking straw pulp raw material is sent into boiling in the rotary spherical digester, make magma;
2. described magma is extracted black liquor through three extrusion equipments;
3. the magma of having extracted black liquor is sent into pulping process and is carried out slurrying, and the plain boiled water of its output is by an oblique net filtration device collection paper pulp fiber, and the plain boiled water of filtering enters a collecting tank;
4. in collecting tank, add flocculant, pump into the super efficiency shallow air flotation device, carry out aeration simultaneously and add flocculation aid by pump;
5. the scum silica frost that the super efficiency shallow air flotation device is collected enters sludge-tank through paper pulp concentration basin, the stirring of paper pulp pond, and last clear water can directly discharge or reuse.
The method of papermaking straw pulp sewage disposal of the present invention, wherein 1. in spherical digester, add the sodium sulfite that accounts for straw pulp weight 13～15% in the step the, account for the formaldehyde and the anthraquinone that accounts for straw pulp weight 0.03～0.05% of straw pulp weight 1.3～1.4%, they are mixed, and be heated to 160～175 ℃, reacted 3 hours.
2. the method for papermaking straw pulp sewage disposal of the present invention wherein comprises the steps: in the step
1. will be diluted to 8～9% from the magma of rotary spherical digester ejection, and behind pulp screen, send into first black liquor extraction equipment and push, the concentrated black liquid 50-60% that extrudes sends to drying, and remainder is back to and is used for dilution in the magma;
2. the slurries from first black liquor extraction equipment are diluted to 8～9%, pump into second black liquor extraction equipment then, carry out press filtration, the 80-90% choline of the rare black liquor of one-level that is leached returns rotary spherical digester, and remainder is sent to drying;
3. with flushing with clean water second black liquor extraction equipment, used clear water enters in the slurries, is used for dilution;
4. the slurries from second black liquor extraction equipment are diluted to 10%, pump into the 3rd black liquor extraction equipment then, carry out press filtration, 10% choline of the rare black liquor of secondary that is leached returns rotary spherical digester, 69% returns from the paper pulp of first black liquor extraction equipment output as dilution, and remainder is back to from the paper pulp of second black liquor extraction equipment output as dilution;
5. with flushing with clean water the 3rd black liquor extraction equipment, used clear water enters in the slurries, is used for dilution;
6. the paper pulp that the 3rd black liquor extraction equipment is exported is after being diluted to 4～5%, be delivered to wash engine, the three grades of rare black liquor 5% that wash out are back to from the paper pulp of second black liquor extraction equipment output as dilution, and remainder is delivered to from the paper pulp of the 3rd black liquor extraction equipment output as dilution;
7. use the flushing with clean water wash engine, its water exports subsequent processing to paper pulp.
The oblique net filtration device that the method for papermaking straw pulp sewage disposal of the present invention is used, wherein in a stock tank, be provided with screen pack, top at described stock tank is provided with the tank of taking the mouth of a river out of along its both sides at least, described tank has certain drop, screen pack 1 is two in the present embodiment, one end of each screen pack is located at the delivery port place, and the other end connects by connecting plate at an angle to each otherly, and the bottom of stock tank is provided with water discharge outlet.
The method of papermaking straw pulp sewage disposal of the present invention, wherein cod (the chemical oxygen consumption (COC))＜2000mg/t amount by waste water is to calculate 8000 cubes/every day, flocculant (compound aluminium chloride) is that 1.2t/d flocculation aid (polyacrylamide) is 12kg/d.
Advantage of the present invention and good effect are, black liquid recovery rate height, and middle section water improvement investment is little, and whole technical process operating cost is low, administers thoroughly, can reach the stably reaching standard discharging.
Other details of the present invention and characteristics can be cheer and bright by reading the embodiment hereinafter encyclopaedize with reference to accompanying drawing.
Description of drawings
Fig. 1 is the block diagram of papermaking straw pulp sewage water treatment method black liquid extraction process of the present invention;
Fig. 2 is the block diagram that papermaking straw pulp sewage water treatment method middle section water of the present invention is handled;
Fig. 3 is the partial top view of oblique net filtration device in the papermaking straw pulp sewage water treatment method of the present invention;
Fig. 4 is the A-A cutaway view among Fig. 3.
The specific embodiment
The method of papermaking straw pulp sewage disposal of the present invention comprises the steps:
1. the papermaking straw pulp raw material is sent in the rotary spherical digester, in spherical digester, added the sodium sulfite that accounts for straw pulp weight 13～15%, account for the formaldehyde and the anthraquinone that accounts for straw pulp weight 0.03～0.05% of straw pulp weight 1.3～1.4%, they are mixed, and be heated to 160～175 ℃, and reacted 3 hours, make magma;
2. three processes of described magma extrusion equipment extracts black liquor;
To be diluted to 8～9% from the magma of rotary spherical digester ejection, and behind pulp screen, send into first black liquor extraction equipment and push, the concentrated black liquid 50-60% that extrudes sends to drying, and remainder is back to and is used for dilution in the magma;
Slurries from first black liquor extraction equipment are diluted to 8～9%, pump into second black liquor extraction equipment then, carry out press filtration, the 80-90% choline of the rare black liquor of one-level that is leached returns rotary spherical digester, and remainder is sent to drying;
With flushing with clean water second black liquor extraction equipment, used clear water enters in the slurries, is used for dilution;
Slurries from second black liquor extraction equipment are diluted to 10%, pump into the 3rd black liquor extraction equipment then, carry out press filtration, 10% part choline of the rare black liquor of secondary that is leached returns rotary spherical digester, 60% returns from the paper pulp of first black liquor extraction equipment output as dilution, and remainder is back to from the paper pulp of second black liquor extraction equipment output as dilution;
With flushing with clean water the 3rd black liquor extraction equipment, used clear water enters in the slurries, is used for dilution;
With the paper pulp of the 3rd black liquor extraction equipment output after being diluted to 4～5%, be delivered to wash engine, the three grades of rare black liquor 5% that wash out are back to from the paper pulp of second black liquor extraction equipment output as dilution, and remainder is delivered to from the paper pulp of the 3rd black liquor extraction equipment output as dilution
Use the flushing with clean water wash engine, its water exports subsequent processing to paper pulp;
3. the magma of having extracted black liquor is sent into pulping process and is carried out slurrying, and the plain boiled water of its output is by an oblique net filtration device collection paper pulp fiber, and the plain boiled water of filtering enters a collecting tank;
4. in collecting tank, add flocculant, pump into the super efficiency shallow air flotation device, carry out aeration simultaneously and add flocculation aid by pump; Cod (chemical oxygen consumption (COC))＜2000mg/t amount by waste water is to calculate 8000 cubes/every day, and compound aluminium chloride (flocculant) is that 1.2 tons of/day polyacrylamides (flocculation aid) are 12 kg/day;
5. the scum silica frost collected of super efficiency shallow air flotation device, described scum silica frost stirs through paper pulp concentration basin, paper pulp pond and enters sludge-tank, and last clear water can directly discharge or reuse.
Oblique net filtration device such as Fig. 3 that the method for papermaking straw pulp sewage disposal of the present invention is used, shown in 4, in a stock tank 1, be provided with screen pack 2, top at described stock tank 1 is provided with the tank 4 of taking the mouth of a river 3 out of at least along its both sides, described tank 4 has certain drop, and screen pack 2 is two in the present embodiment, and an end of each screen pack 2 is located at 3 mouthfuls of places of water outlet, the other end connects by connecting plate 5 at an angle to each otherly, and the bottom of stock tank 1 is provided with water discharge outlet 6.
Be promoted in the tank 4 with the plain boiled water of motor (not shown) input, plain boiled water is when flowing around tank 4, flow to screen pack 2 filtration of getting on from the apopore 3 of tank 4 inboards, filter the treatment process that the drainage 6 of back from 2 times stock tanks 1 of screen pack flows into the road, back.The paper pulp that leaches is collected by the workman who stands on the filter screen middle connecting plate 5.
Claims (5)
1. the method for a papermaking straw pulp sewage disposal comprises the steps:
1. the papermaking straw pulp raw material is sent into boiling in the rotary spherical digester, make magma;
2. described magma is extracted black liquor through three extrusion equipments:
(1) will be diluted to 8～9% from the magma of rotary spherical digester ejection, and behind pulp screen, send into first black liquor extraction equipment and push, a concentrated black liquid part of extruding is sent to drying, and another part is back to and is used for dilution in the magma;
(2) slurries from first black liquor extraction equipment are diluted to 8～9%, pump into second black liquor extraction equipment then, carry out press filtration, a part of choline of the rare black liquor of one-level that is leached returns rotary spherical digester, and another part is sent to drying;
(3) with flushing with clean water second black liquor extraction equipment, used clear water enters in the slurries, is used for dilution;
(4) slurries from second black liquor extraction equipment are diluted to 10%, pump into the 3rd black liquor extraction equipment then, carry out press filtration, first's choline of the rare black liquor of secondary that is leached returns rotary spherical digester, second portion returns from the paper pulp of first black liquor extraction equipment output as dilution, and third part is back to from the paper pulp of second black liquor extraction equipment output as dilution;
(5) with flushing with clean water the 3rd black liquor extraction equipment, used clear water enters from the slurries of the 3rd black liquor extraction equipment output and in the slurries, is used for dilution;
(6) paper pulp that the 3rd black liquor extraction equipment is exported is after being diluted to 4～5%, be delivered to wash engine, three grades of rare black liquor parts that wash out are back to from the paper pulp of second black liquor extraction equipment output as dilution, and another part is delivered to from the paper pulp of the 3rd black liquor extraction equipment output as dilution;
(7) use the flushing with clean water wash engine, its water exports subsequent processing to paper pulp;
3. the magma of having extracted black liquor is sent into pulping process and is carried out slurrying, and the plain boiled water of its output is by an oblique net filtration device collection paper pulp fiber, and the plain boiled water of filtering enters a collecting tank;
4. in collecting tank, add flocculant, pump into the super efficiency shallow air flotation device, carry out aeration simultaneously and add flocculation aid by pump;
5. the scum silica frost collected of super efficiency shallow air flotation device, described scum silica frost stirs through paper pulp concentration basin, paper pulp pond and enters sludge-tank, and last clear water can directly discharge or reuse.
2. the method for papermaking straw pulp sewage disposal according to claim 1, wherein 1. in spherical digester, add the sodium sulfite that accounts for straw pulp weight 13～15% in the step the, account for the formaldehyde and the anthraquinone that accounts for straw pulp weight 0.03～0.05% of straw pulp weight 1.3～1.4%, they are mixed, and be heated to 160～175 ℃, reacted 3 hours.
3. 2. the method for papermaking straw pulp sewage disposal according to claim 1 and 2 wherein comprises the steps: in the step
(1) will be diluted to 8～9% from the magma of rotary spherical digester ejection, and behind pulp screen, send into first black liquor extraction equipment and push, the concentrated black liquid 50-60% that extrudes sends to drying, and remainder is back to and is used for dilution in the magma;
(2) slurries from first black liquor extraction equipment are diluted to 8～9%, pump into second black liquor extraction equipment then, carry out press filtration, the 80-90% choline of the rare black liquor of one-level that is leached returns rotary spherical digester, and remainder is sent to drying;
(3) with flushing with clean water second black liquor extraction equipment, used clear water enters in the slurries, is used for dilution;
(4) slurries from second black liquor extraction equipment are diluted to 10%, pump into the 3rd black liquor extraction equipment then, carry out press filtration, 10% choline of the rare black liquor of secondary that is leached returns rotary spherical digester, 60% returns from the slurries of first black liquor extraction equipment output as dilution, and remainder is back to from the slurries of second black liquor extraction equipment output as dilution;
(5) with flushing with clean water the 3rd black liquor extraction equipment, used clear water enters from the slurries of the 3rd black liquor extraction equipment output and in the slurries, is used for dilution;
(6) paper pulp that the 3rd black liquor extraction equipment is exported is after being diluted to 4～5%, be delivered to wash engine, the three grades of rare black liquor 5% that wash out are back to from the slurries of second black liquor extraction equipment output as dilution, and remainder is delivered to from the slurries of the 3rd black liquor extraction equipment output as dilution;
(7) use the flushing with clean water wash engine, its water exports subsequent processing to slurries.
4. the method for papermaking straw pulp sewage disposal according to claim 3, wherein the COD---chemical oxygen consumption (COC)＜2000mg/t amount by waste water is to calculate 8000 cubes/every day, flocculant---compound aluminium chloride is 1.2 tons/day, and flocculation aid---polyacrylamide is 12 kg/day.
5. the method for papermaking straw pulp sewage disposal according to claim 1, it is characterized in that the oblique net filtration device that is provided with in the described stock tank, wherein the top of stock tank (1) is provided with respectively the tank (4) with a delivery port (3) along its both sides, stock tank (1) has certain drop with tank (4), wherein screen pack (2) is two, one end of each screen pack is located at delivery port (3) and locates, and the other end connects by connecting plate (5) at an angle to each otherly, and the bottom of stock tank is provided with water discharge outlet (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100662 CN1203231C (en) | 2002-02-10 | 2002-02-10 | Waste-liquid treatment method for straw pulp paper-making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02100662 CN1203231C (en) | 2002-02-10 | 2002-02-10 | Waste-liquid treatment method for straw pulp paper-making |
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| Publication Number | Publication Date |
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| CN1438385A CN1438385A (en) | 2003-08-27 |
| CN1203231C true CN1203231C (en) | 2005-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02100662 Expired - Fee Related CN1203231C (en) | 2002-02-10 | 2002-02-10 | Waste-liquid treatment method for straw pulp paper-making |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102306A (en) * | 2010-12-10 | 2011-06-22 | 中顺洁柔纸业股份有限公司 | Recycle process of white water of papermaking system |
| CN106045215A (en) * | 2016-07-15 | 2016-10-26 | 东莞顺裕纸业有限公司 | Biochemical pretreatment technology of high-hardness and high-salinity papermaking wastewater |
| US11033867B2 (en) | 2017-09-27 | 2021-06-15 | Sustainable Fiber Technologies, LLC | Aqueous lignin and hemicellulose dispersion |
| US11066588B2 (en) | 2017-11-21 | 2021-07-20 | Sustainable Fiber Technologies, LLC | Deicing composition comprising lignocellulosic byproducts |
| US11091697B2 (en) | 2017-11-29 | 2021-08-17 | Sustainable Fiber Technologies, LLC | Dust suppressant and soil stabilization composition comprising lignocellulosic byproducts |
| US20220195667A1 (en) * | 2019-06-28 | 2022-06-23 | Sustainable Fiber Technologies, LLC | Method and Apparatus for Treating Lignocellulosic Material |
| CN111018159A (en) * | 2019-12-27 | 2020-04-17 | 永发（江苏）模塑包装科技有限公司 | Method for removing paper fiber from waste water of paper pulp molding production |
| US11572474B2 (en) | 2020-05-22 | 2023-02-07 | Sustainable Fiber Technologies, LLC | Compositions comprising lignocellulosic byproducts for tire ballasts and associated methods |
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- 2002-02-10 CN CN 02100662 patent/CN1203231C/en not_active Expired - Fee Related
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| CN1438385A (en) | 2003-08-27 |
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Granted publication date: 20050525 Termination date: 20120210 |