CN114105356A - Deep treatment process for papermaking by using waste paper - Google Patents
Deep treatment process for papermaking by using waste paper Download PDFInfo
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- CN114105356A CN114105356A CN202111370773.5A CN202111370773A CN114105356A CN 114105356 A CN114105356 A CN 114105356A CN 202111370773 A CN202111370773 A CN 202111370773A CN 114105356 A CN114105356 A CN 114105356A
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000010893 paper waste Substances 0.000 title claims abstract description 26
- 239000010865 sewage Substances 0.000 claims abstract description 43
- 239000010802 sludge Substances 0.000 claims abstract description 30
- 238000004062 sedimentation Methods 0.000 claims abstract description 27
- 238000001179 sorption measurement Methods 0.000 claims abstract description 19
- 239000000701 coagulant Substances 0.000 claims abstract description 12
- 229960000892 attapulgite Drugs 0.000 claims abstract description 4
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 55
- 238000005189 flocculation Methods 0.000 claims description 26
- 230000016615 flocculation Effects 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 15
- 230000015271 coagulation Effects 0.000 claims description 14
- 238000005345 coagulation Methods 0.000 claims description 14
- 239000003463 adsorbent Substances 0.000 claims description 12
- 238000010992 reflux Methods 0.000 claims description 12
- 238000004537 pulping Methods 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 150000001450 anions Chemical class 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 abstract description 4
- 239000013043 chemical agent Substances 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 230000001112 coagulating effect Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 235000003891 ferrous sulphate Nutrition 0.000 abstract description 2
- 239000011790 ferrous sulphate Substances 0.000 abstract description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 abstract description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 abstract description 2
- 239000000123 paper Substances 0.000 description 5
- 239000011087 paperboard Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 241000274582 Pycnanthus angolensis Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 hydroxyl free radical Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses an advanced treatment process for waste paper papermaking sewage, which is used for treating effluent of a biochemical treatment section of the waste paper papermaking sewage, and realizes the targeted degradation of refractory organic matters (COD) in the sewage, the reduction of the chromaticity of the sewage, suspended matters (SS) and the like through the actions of physical adsorption, coagulating sedimentation and the like by controlling the feeding point and the feeding proportion of chemical agents (mainly modified attapulgite and coagulant). The sewage advanced treatment process is simple to operate, the chemical agent dosage is small, the sludge production is small, the traditional Fenton oxidation process can be replaced under specific conditions, the dosage of chemicals such as strong acid, strong alkali, hydrogen peroxide, ferrous sulfate and the like is reduced, and the advanced treatment cost of the waste paper papermaking sewage is reduced.
Description
Technical Field
The invention belongs to the technical field of papermaking sewage treatment, and relates to an advanced treatment process for waste paper papermaking sewage.
Background
The regenerated paper uses waste paperboard, newspaper, books and periodicals as main raw material to produce various specifications of white paperboard, boxboard, corrugated paper and other products. The main technological process includes pulping, purifying, screening, concentrating, storing, pulping, sieving, squeezing, stoving, winding, etc. Because the waste paper raw materials are various, the impurity content is high, and partial waste paper is recycled and regenerated many times, compared with the ordinary pulping and papermaking sewage, the waste paper papermaking sewage has more complex components, contains higher suspended matters and organic load, and has large treatment difficulty.
The most widely applied and mature sewage advanced treatment process of various waste paper mills is mainly a Fenton (Fenton) oxidation method, which is one of advanced oxidation technologies and has the characteristics of strong oxidation capacity, short reaction time and the like. FeSO is added under acidic condition4And H2O2The hydroxyl free radical with strong oxidizing property is generated by reaction, and the substances such as cellulose, hemicellulose, lignin and the like in the pulping and papermaking sewage can be effectively degraded. However, the method still has the problems of high treatment cost, large sludge production, difficult treatment and utilization of the iron-rich sludge, easy corrosion equipment, large acid and alkali addition amount and the like in the prior operation. Meanwhile, aiming at the situations of recycled paper sewage, large fluctuation of the quality of the incoming water and high pollution load, the adding proportion of the Fenton process medicament is difficult to control, and the actual operation adjustment is often difficult to follow.
Therefore, the research on the waste paper papermaking advanced treatment process which is low in comprehensive treatment and disposal cost, simple to operate and stable in operation is of great significance.
Disclosure of Invention
The invention aims to provide an advanced treatment process for waste paper papermaking sewage, which greatly reduces the contents of organic matters (COD), chromaticity, suspended matters (SS) and the like in treated effluent and meets the water inlet standard of a reclaimed water recycling system in GB 3554-2008 'discharge Standard of Water pollution in pulping and papermaking industries'.
The technical scheme of the invention is as follows:
a process for deeply treating waste paper papermaking sewage comprises the following process steps:
s1, enabling the waste paper papermaking sewage after biochemical treatment to flow through an adsorption reaction tank, adding adsorbent modified attapulgite into the adsorption reaction tank through an adsorbent adding device, and stirring and reacting by using a No. 1 stirrer, wherein the preparation concentration is 8-12%, and the adding amount is 2-6 per mill;
s2, continuously flowing the sewage in the adsorption reaction tank through a primary flocculation reaction tank, adding 1 # flocculant nonionic polyacrylamide into the primary flocculation reaction tank through a 1 # flocculant adding device, configuring the concentration to be 1% -3 per mill, adding the dosage to be 1% -3 per mill, and stirring and reacting by a 2 # stirrer;
s3, discharging water from the primary flocculation reaction tank to a primary sedimentation tank, wherein part of the settled sludge flows back to the adsorption reaction tank through a sludge return pump for recycling, and part of the settled sludge is conveyed to a secondary sedimentation tank through a residual sludge pump;
s4, enabling the effluent of the primary sedimentation tank to flow into a coagulation reaction tank, adding a coagulant polyaluminium chloride into the coagulation reaction tank through a coagulant adding device, and stirring and reacting by a No. 3 stirrer, wherein the concentration is 10-20%, and the adding amount is 2-4 ‰;
s5, continuously flowing the effluent of the coagulation reaction tank through a secondary flocculation reaction tank, adding No. 2 flocculant anionic polyacrylamide into the secondary flocculation reaction tank through a No. 2 flocculant adding device, wherein the preparation concentration is 1-3 per mill, the adding amount is 1-3 per mill, and stirring and reacting by a No. 4 stirrer;
and S6, discharging water from the secondary flocculation reaction tank to a secondary sedimentation tank 22, wherein the final discharged water meets GB 3554-2008 'discharge Standard of pollution of Water in pulping and papermaking industries' or Water inlet Standard of reclaimed water reuse System.
Preferably, the configuration concentration of the adsorbent is 10%, the configuration concentration of the coagulant is 10%, and the configuration concentrations of the No. 1 flocculant and the No. 2 flocculant are 2 per thousand; the addition amount of the adsorbent is 3 per mill, the addition amount of the coagulant is 3 per mill, and the addition amounts of the No. 1 flocculant and the No. 2 flocculant are 1 per mill.
Preferably, the Hydraulic Retention Time (HRT) of the adsorption reaction tank is 20-60 min, the HRT of the coagulation reaction tank is 10-30 min, the HRT of the primary flocculation reaction tank and the secondary flocculation reaction tank is 5-12 min, and the HRT of the primary sedimentation tank and the secondary sedimentation tank is 4-6 h and 1-3 h respectively.
More preferably, the HRT of the adsorption reaction tank is 40min, the HRT of the coagulation reaction tank is 20min, the HRT of the primary flocculation reaction tank and the secondary flocculation reaction tank is 8min, and the HRT of the primary sedimentation tank and the secondary sedimentation tank is 5h and 2h respectively.
In the invention, the No. 1 stirrer and the No. 3 stirrer are paddle type stirrers, and the No. 2 stirrer and the No. 4 stirrer are frame type stirrers.
Preferably, the rotating speed of the No. 1 stirrer and the No. 3 stirrer is 150-250 rpm, and the rotating speed of the No. 2 stirrer and the No. 4 stirrer is 30-70 rpm.
More preferably, the rotation speed of the No. 1 stirrer and the No. 3 stirrer is 200rpm, and the rotation speed of the No. 2 stirrer and the No. 4 stirrer is 50 rpm.
Preferably, the sludge reflux pump in the step 3 controls the sludge reflux ratio to be 25-75%, so that the adsorbent which is not saturated by adsorption can be recycled, and the cost is further reduced.
More preferably, the step 3 sludge reflux pump controls the sludge reflux ratio to be 50%.
The invention provides an advanced treatment process for waste paper papermaking sewage, which is used for treating effluent of a biochemical working section of the waste paper papermaking sewage, and realizes the targeted degradation of refractory organic matters (COD) in the sewage, the reduction of sewage chromaticity, suspended matters (SS) and the like through the actions of physical adsorption, coagulating sedimentation and the like by controlling the adding point and adding proportion of chemical agents (mainly modified attapulgite and polyaluminium chloride). The sewage advanced treatment process is simple to operate, the chemical agent dosage is small, the sludge production is small, the traditional Fenton oxidation process can be replaced under specific conditions, the dosage of chemicals such as strong acid, strong alkali, hydrogen peroxide, ferrous sulfate and the like is reduced, and the advanced treatment cost of the waste paper papermaking sewage is reduced.
Drawings
FIG. 1 is a route diagram of a waste paper papermaking sewage advanced treatment process.
In the figure: 1. the method comprises the steps of waste paper papermaking sewage treatment biochemical section effluent treatment, 2 an adsorption reaction tank, 3 a primary flocculation reaction tank, 4 an adsorbent adding device, 5.1 a stirrer, 6.1 a flocculant adding device, 7.2 a stirrer, 8 a primary flocculation reaction tank effluent pipeline, 9 a primary sedimentation tank, 10 a primary sedimentation tank effluent pipeline, 11 a sludge reflux pump, 12 a sludge reflux pipeline, 13 a residual sludge pump, 14 a residual sludge pipeline, 15 a coagulation reaction tank, 16 a secondary flocculation reaction tank, 17.3 a stirrer, 18 a coagulant adding device, 19.4 a stirrer, 20.2 a flocculant adding device, 21 a secondary flocculation reaction tank effluent pipeline, 22 a secondary sedimentation tank and 23 deep treatment effluent.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, but the embodiments do not limit the present invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated. Unless otherwise indicated, reagents and materials used in the following examples are commercially available.
Example 1:
as shown in figure 1, the advanced treatment process of the waste paper papermaking sewage comprises the following process steps when the COD concentration of inlet water is lower than 200 mg/L:
s1, enabling the paper making sewage of the regenerated paper pulp subjected to biochemical treatment to flow into an adsorption reaction tank 2, adding an adsorbent with the proportion of 10% and the addition of 3 per mill into an adsorbent adding device 4, stirring and reacting by a No. 1 stirrer 5 at the rotating speed of 200rpm, and setting the Hydraulic Retention Time (HRT) to be 30 min;
s2, continuously flowing the sewage in the adsorption reaction tank 2 through the primary flocculation reaction tank 3, adding a No. 1 flocculating agent with the addition amount of 1 per mill in the proportion of 2 per mill by a No. 1 flocculating agent adding device 6, stirring and reacting by a No. 2 stirrer 7 at the rotating speed of 50rpm, and setting the HRT to be 8 min;
s3, enabling the sewage to flow into a primary sedimentation tank 9, setting HRT to be 4h, controlling the sludge reflux ratio to be 75% through a sludge reflux pump 11, and conveying the residual sludge to a secondary sedimentation tank 22 through a residual sludge pump 13;
s4, enabling the effluent of the primary sedimentation tank 9 to flow into a coagulation reaction tank 15, adding a coagulant with the proportion of 10% and the addition of 3 per mill by a coagulant adding device 18, stirring and reacting by a No. 3 stirrer 17 at the rotating speed of 150rpm, and setting the HRT to be 20 min;
s5, the sewage in the coagulation reaction tank 15 continuously flows through the secondary flocculation reaction tank 16, a 2 # flocculant adding device 20 is used for adding a flocculant with a preparation proportion of 2 per mill and an adding amount of 1 per mill, a 4 # stirrer 19 is used for stirring and reacting at a rotating speed of 50rpm, and the HRT is set to be 8 min;
and S6, finally, enabling the sewage to flow into the secondary sedimentation tank 22, setting the HRT to be 1h, and enabling the finally-treated effluent to meet the GB 3554-2008 'discharge Standard for pollution of Water in the pulping and papermaking industries' or the reclaimed water reuse Standard.
The experimental results are as follows: experiments were conducted with the advanced treatment process and procedure described in example 1 above, and A, B, C groups in Table 1 show the treatment effect of example 1 with different inlet water quality fluctuations.
Table 1 water quality treatment test results of example 1
Example 2:
as shown in figure 1, the advanced treatment process for waste paper papermaking sewage comprises the following process steps when the COD concentration of inlet water is 200-250 mg/L:
s1, enabling the paper making sewage of the regenerated paper pulp subjected to biochemical treatment to flow into an adsorption reaction tank 2, adding an adsorbent with the proportion of 10% and the addition of 4 per mill into an adsorbent adding device 4, stirring and reacting by a No. 1 stirrer 5 at the rotating speed of 150rpm, and setting the Hydraulic Retention Time (HRT) to be 60 min;
s2, continuously flowing the sewage in the adsorption reaction tank 2 through the primary flocculation reaction tank 3, adding 1.5 per mill of 1 addition amount of 1 flocculant by a 1 flocculant adding device 6, stirring and reacting by a 2-number stirrer 7 at a rotating speed of 50rpm, and setting the HRT to be 10 min;
s3, enabling the sewage to flow into a primary sedimentation tank 9, setting HRT to be 5h, controlling the sludge reflux ratio to be 50% through a sludge reflux pump 11, and conveying the residual sludge to a secondary sedimentation tank 22 through a residual sludge pump 13;
s4, enabling the effluent of the primary sedimentation 9 tank to flow into a coagulation reaction tank 15, adding a coagulant with the proportion of 20% and the addition of 2 per mill by a coagulant adding device 18, stirring and reacting by a No. 3 stirrer 17 at the rotating speed of 150rpm, and setting the HRT to be 15 min;
s5, the sewage in the coagulation reaction tank 15 continuously flows through the secondary flocculation reaction tank 16, 1.5 per mill of flocculant with the addition amount of 1 per mill is added by a No. 2 flocculant adding device 20, the mixture is stirred and reacted by a No. 4 stirrer 19 at the rotating speed of 50rpm, and the HRT is set to be 10 min;
and S6, finally, enabling the sewage to flow into the secondary sedimentation tank 22, wherein the HRT is 2h, and the finally treated effluent meets GB 3554-2008 'discharge Standard for Water pollution in pulping and papermaking industries'.
The experimental results are as follows: experiments were conducted using the advanced treatment process and procedure of example 2 above, and D, E, F groups in Table 2 show the treatment effect of example 2 with different influent water quality fluctuations.
Table 2 water quality treatment test results of example 2
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (4)
1. The advanced treatment process of waste paper papermaking sewage is characterized by comprising the following process steps:
s1, enabling the waste paper papermaking sewage after biochemical treatment to flow through an adsorption reaction tank (2), adding adsorbent modified attapulgite into the adsorption reaction tank through an adsorbent adding device (4), and stirring and reacting by a No. 1 stirrer (5), wherein the preparation concentration is 8-12% and the adding amount is 2-6 per mill;
s2, continuously flowing the sewage in the adsorption reaction tank through the primary flocculation reaction tank (3), adding 1 # flocculant nonionic polyacrylamide into the primary flocculation reaction tank (3) through a 1 # flocculant adding device (6), wherein the preparation concentration is 1% -3 per mill, the adding amount is 1% -3 per mill, and stirring and reacting are carried out through a 2 # stirrer (7);
s3, discharging water from the primary flocculation reaction tank (3) to a primary sedimentation tank (9), wherein part of the precipitated sludge flows back to the adsorption reaction tank for recycling through a sludge return pump (11), and part of the precipitated sludge is conveyed to a secondary sedimentation tank (22) through a residual sludge pump (13);
s4, enabling the effluent of the primary sedimentation tank (9) to flow into a coagulation reaction tank (15), adding a coagulant polyaluminium chloride into the coagulation reaction tank (15) through a coagulant adding device (18), wherein the preparation concentration is 10-20%, the adding amount is 2-4 per mill, and stirring and reacting by a No. 3 stirrer (17);
s5, the effluent of the coagulation reaction tank (15) continuously flows through a secondary flocculation reaction tank (16), a No. 2 flocculant anion polyacrylamide is added into the secondary flocculation reaction tank (16) through a No. 2 flocculant adding device (20), the preparation concentration is 1-3 per mill, the adding amount is 1-3 per mill, and a No. 4 stirrer (19) is used for stirring and reacting;
and S6, discharging water from the secondary flocculation reaction tank to a secondary sedimentation tank (22), wherein the final discharged water meets GB 3554-2008 'discharge Standard of pollution of Water in pulping and papermaking industries' or the water inlet standard of a reclaimed water reuse system.
2. The advanced treatment process of waste paper papermaking sewage as claimed in claim 1, wherein: the hydraulic retention time HRT of the adsorption reaction tank (2) is 20-60 min, the HRT of the coagulation reaction tank (15) is 10-30 min, the HRT of the primary flocculation tank (3) and the HRT of the secondary flocculation tank (16) are 5-12 min, and the HRT of the primary sedimentation tank (9) and the HRT of the secondary sedimentation tank (22) are 4-6 h and 1-3 h respectively.
3. The advanced treatment process of waste paper papermaking sewage as claimed in claim 1, wherein: the No. 1 stirrer (5) and the No. 3 stirrer (17) are paddle type stirrers, and the rotating speed is 150-250 rpm; the No. 2 stirrer (7) and the No. 4 stirrer (19) are frame type stirrers, and the rotating speed is 30-70 rpm.
4. The advanced treatment process of waste paper papermaking sewage as claimed in claim 1, wherein: and in the step S3, the sludge reflux ratio of the sludge reflux pump (11) is controlled to be 25-75%.
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5624089A (en) * | 1979-08-02 | 1981-03-07 | Oji Paper Co Ltd | Coagulation and sedimentation treatment of waste water of pulp mill |
| CN1240767A (en) * | 1998-07-03 | 2000-01-12 | 毛呜庆 | Process for treating waste paper-making liquor |
| JP2001079308A (en) * | 1999-09-20 | 2001-03-27 | Microalgae Corporation | Flocculating material for waste pulp in paper making waste water and treatment of paper making waste water using the same |
| CN101050044A (en) * | 2007-05-14 | 2007-10-10 | 庞鹏远 | Method for carrying out advanced treatment on papermaking sewage |
| CN101544450A (en) * | 2009-05-05 | 2009-09-30 | 浙江省环境保护科学设计研究院 | Method for treating and recycling waste paper making wastewater |
| CN102417247A (en) * | 2010-09-27 | 2012-04-18 | 中国科学院生态环境研究中心 | Two-stage sludge reflux enhanced coagulation technology |
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