CN1285435A - Sewage comprehensive treatment method for alkaline method straw pulp paper-making - Google Patents
Sewage comprehensive treatment method for alkaline method straw pulp paper-making Download PDFInfo
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- CN1285435A CN1285435A CN 00113922 CN00113922A CN1285435A CN 1285435 A CN1285435 A CN 1285435A CN 00113922 CN00113922 CN 00113922 CN 00113922 A CN00113922 A CN 00113922A CN 1285435 A CN1285435 A CN 1285435A
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Abstract
The sode straw pulp paper-making sewage treatment method includes the following two steps: 1. black liquor treatment step: adding acidified aluminium sulfate in black liquor, when the pH value is 4-5, fittering to produce brown liquor and black residue; 2. waste water treatment step: mixing the above-mentioned brown liquor, screened waste water, bleached waste water and white water according to the ratio of 1:(4-5):(1-10):(1-8) to obtain mixed sewage, adding sodium hydroxide in the mixed sewage, when its pH value is 7, filtering to produce neutral clear water and yellow residue. Said invention can be extensively used in medium and small sized paper mill to make sewage treatment.
Description
The invention relates to the field of treatment of alkaline straw pulp papermaking sewage, in particular to a comprehensive treatment method of alkaline straw pulp papermaking sewage.
The pollution of paper mill sewage to the environment is a problem which is difficult to effectively solve for a long time, and the treatment of black liquor is the most difficult. The application number is 96118204, the name is potash-black liquor recovery pulping method, discloses a scheme without waste liquid and waste residue discharge in the production process, but the process is complex and long in working procedures, and only in the newly added acidification working procedure, six working procedures of mixing, acid liquor preparation, pre-acidification, precipitation and separation are included; the process needs more equipment for changing the process, the investment and reconstruction cost is higher, and facilities such as a washing tower, an acidification pot, a sedimentation tank or a vacuum suction filter and the like need to be additionally arranged. In the causticizing procedure, ethanol is needed to be added for precipitating calcium sulfate, and the ethanol needs to be distilled and recycled at the temperature of 95 ℃, so that the investment and the operating cost are increased, and the calcium sulfate is difficult to bear by small and medium-sized plants. Meanwhile, the concentrated sulfuric acid is used as a flocculating agent, so that potential safety hazards are brought.
The invention aims to provide a comprehensive treatment method for alkaline straw pulp papermaking sewage, which treats waste with waste, clears the sewage, utilizes waste residues, and has the advantages of simple process, convenient operation and small investment.
In order to achieve the purpose, the technical solution of the invention is as follows: the comprehensive treatment method of the alkaline straw pulp papermaking sewage is characterized by sequentially comprising the following two steps,
firstly, black liquor treatment:
adding an acidified aluminum sulfate solution into the black liquor at normal temperature and normal pressure, flocculating when the pH value is 4-5, and filtering to generate brown liquor and black residues;
II, middle-stage and rear-stage wastewater treatment steps:
mixing the palm liquid, the screening wastewater, the bleaching wastewater and the paper vehicle white water into mixed sewage according to the volume ratio of 1: 1-5: 1-10: 1-8, stirring uniformly, adding a sodium hydroxide solution until the pH value is =7, settling yellow flocculate, and filtering to generate neutral clear water and yellow slag.
In the black liquor treatment step, the flocculation effect is best when the pH is = 4.5.
In the step of treating the middle-stage wastewater and the back-stage wastewater, when the palm liquid, the screening wastewater, the bleaching wastewater and the paper car white water are mixed into mixed sewage according to the volume ratio of 1: 4-5: 7-10: 6-8, an acidified aluminum sulfate solution with the volume total of 2-8 per mill of the mixed sewage is added after the mixed sewage is uniformly stirred, and then a sodium hydroxide solution is added to adjust the pH value. The purpose of adding the process is to prevent the neutral clear water from being in a micro-emulsion state after filtration.
The effect is better when the brown liquid, the screening wastewater, the bleaching wastewater and the white water of the paper vehicle are mixed according to the ratio of 1: 2 in the mixed sewage.
The neutral clear water can be recycled.
The rest part of the reclaimed neutral clear water can be discharged into the next deep sewage treatment device.
The black slag after the black liquor treatment can be used as an organic compound fertilizer carrier, added with nitrogen, phosphorus, potassium and other element substances, dried, granulated, dried at low temperature and finally packaged to prepare the organic compound fertilizer.
The yellow slag is acidified to prepare an aluminum sulfate solution for treating black slag.
In the step of preparing aluminum sulfate by acidification, dilute sulfuric acid is used for acidification.
When the cooking liquor in the paper-making cooking process is potassium hydroxide solution, the black residue after black liquor treatment is organic potash fertilizer, and the organic potash fertilizer is prepared by drying, granulating, drying at low temperature and finally packaging.
The drawings illustrate the following:
the attached drawing is a flow chart of the invention.
Example (b):
referring to the drawings:
the invention comprises two steps:
firstly, black liquor treatment:
discharging the black liquor into a black liquor dosing tank, adding an acidified aluminum sulfate solution into the black liquor dosing tank, uniformly stirring, and feeding the black liquor into a black liquor filter through a black liquor pump to separate black residues from brown liquor when the final pH value is 4-5;
the reaction mechanism is as follows:
OH-(Black liquor) + H+(acidified aluminum sulfate solution) → H2O
30H-(Black liquor) + Al3+Acidified aluminum sulfate solution → Al (OH)3↓
The pH value of the black liquor is 13-14, acidifying and flocculating the black liquor by using acidified aluminum sulfate, firstly, collecting 1 liter of black liquor water sample to determine the adding amount of a black liquor pool, then adding aluminum sulfate into the black liquor while stirring, and stirring for 10minutes to determine the pH value. And observing the flocculation generation of the aluminum hydroxide, adsorbing organic substances and then precipitating, wherein the test results are shown in the table:
| end point pH value | State of flocculation | Filtration | Yielding water 1 | Discharging slag |
| 4 | The thick sticky colloid is generated instantly | Filtering after a moment | Yellow transparent clear liquid | Black slag |
| 4.5 | Glue is generated in a momentFlocculation-like | Filtering after a moment | Light yellow clear liquid | Black slag |
| 5 | Colloidal suspension | Long time filtration is needed | Brown clear liquid | Black slag |
Discharging the brown liquid into a brown liquid pool for later use, drying and granulating the black residues, and drying at low temperature. When the cooking liquor is mainly caustic soda, the black residue is used as an organic compound fertilizer carrier, and for example, nitrogen, phosphorus, potassium and other element substances are added to prepare an organic compound fertilizer; when the cooking liquor is mainly potash, the black slag is made into organic potash fertilizer.
II, the middle and rear section sewage comprehensive treatment step:
discharging sewage of each section into a sewage mixing tank according to the proportion, adding palm liquid in a palm liquid tank into the sewage mixing tank according to the proportion, uniformly stirring, and then adding a sodium hydroxide solution according to alkali amount data required by sample neutralization and stirring. And (4) measuring the pH value until the pH value is =7, and sending the sewage into a sewage vacuum filter through a sewage pump to separate flocculent slag and neutral clear water.
The reaction mechanism is as follows:
mixing brown liquor generated after black liquor treatment, screening wastewater, bleaching wastewater and paper car white water according to a ratio, adding a sodium hydroxide solution to neutralize until the pH is =7, and obtaining the following test results:
| palm liquid, screening waste water, bleaching waste water and white water (volume ratio) | pH value | Discharging water | Discharging slag |
| 1∶1∶1∶1 | 7 | Clear liquid | Yellow colour |
| 1∶1∶2∶2 | 7 | Clear liquid | Yellow colour |
| 1: 5: 10: 8: 0.075 (adding acidified aluminum sulfate to demulsify) | 7 | Clear liquid | Yellow colour |
The obtained neutral clear water is sent into a reuse water pool, and the redundant part is discharged into a next advanced treatment device. The obtained yellow residue is acidified by dilute sulphuric acid to prepare acidified aluminum sulfate solution which is reused in the black liquor treatment step, and the residue is periodically cleaned.
The reaction mechanism is as follows:
compared with the prior art, the invention has the following advantages:
1. the materials are obtained locally. The aluminium sulfate solution used in the production process is selected to neutralize, acidify and flocculate the black liquor, and the aluminium ions remained in the generated palm liquor are used to flocculate and precipitate the middle and rear section sewage, so that the potential safety hazard is eliminated compared with the neutralization and acidification by using sulfuric acid.
2. The waste is treated by the waste. Brown liquor generated after the black liquor is treated is used for treating middle and rear section wastewater, and finally the obtained neutral clear water can be recycled or discharged into the next sewage treatment procedure. The black slag is used as organic fertilizer carrier or organic potash fertilizer, and the yellow slag can be used for preparing aluminum sulfate solution, so as to achieve the purposes of environmental protection and cyclic utilization.
3. The equipment investment is small. Many of the operations can be performed in a cement pit. The filtering of the flocculated slag can be replaced by a filter or a filtering and settling tank. It is especially suitable for reconstruction of medium and small factories.
4. The process is simple, the operation is convenient, and the process is carried out at normal temperature and normal pressure.
Claims (10)
1. A comprehensive treatment method for alkaline straw pulp papermaking sewage is characterized in that: the method sequentially comprises the following two steps:
firstly, black liquor treatment:
adding an acidified aluminum sulfate solution into the black liquor at normal temperature and normal pressure, flocculating when the pH value is 4-5, and filtering to generate brown liquor and black residues;
II, middle-stage and rear-stage wastewater treatment steps:
mixing the palm liquid, the screening wastewater, the bleaching wastewater and the paper vehicle white water into mixed sewage according to the volume ratio of 1: 1-5: 1-10: 1-8, stirring uniformly, adding a sodium hydroxide solution until the pH value is =7, settling yellow flocculate, and filtering to generate neutral clear water and yellow slag.
2. The integrated treatment method of alkaline straw pulp papermaking sewage as claimed in claim 1: in the middle-stage and later-stage wastewater treatment steps, when palm liquid, screening wastewater, bleaching wastewater and paper car white water are mixed into mixed sewage according to the volume ratio of 1: 4-5: 7-10: 6-8, an acidified aluminum sulfate solution with the volume total amount of the mixed sewage of 2-8 per mill is added after the mixed sewage is uniformly stirred, and then a sodium hydroxide solution is added to adjust the pH value.
3. The integrated treatment method of alkaline straw pulp papermaking sewage as claimed in claim 1 or 2: in the black liquor treatment step, the end point pH value is 4.5.
4. The integrated treatment method of alkaline straw pulp papermaking sewage as claimed in claim 3: the brown liquor, the screening wastewater, the bleaching wastewater and the white water of the paper mill in the mixed sewage are mixed according to the ratio of 1: 2.
5. The integrated treatment method of alkaline straw pulp papermaking sewage as claimed in claim 1 or 2: and taking black slag after black liquor treatment as an organic compound fertilizer carrier, adding nitrogen, phosphorus, potassium and other element substances, mixing, drying, granulating, drying at low temperature, and finally packaging to prepare the organic compound fertilizer.
6. The integrated treatment method of alkaline straw pulp papermaking sewage as claimed in claim 1 or 2: the yellow residue is acidified to prepare an aluminum sulfate solution for treating black liquor.
7. The integrated treatment method of alkaline straw pulp papermaking sewage as claimed in claim 6: acidification is performed using dilute sulfuric acid.
8. The integrated treatment method of alkaline straw pulp papermaking sewage as claimed in claim 1 or 2: and the neutral clear water is recycled.
9. The integrated treatment method of alkaline straw pulp papermaking sewage as claimed in claim 8: and the rest part of the reclaimed neutral clear water is directly discharged into an advanced sewage treatment device.
10. The integrated treatment method of alkaline straw pulp papermaking sewage as claimed in claim 1 or 2: when the cooking liquor in the papermaking cooking procedure is potassium hydroxide, black slag after black liquor treatment is an organic potassium fertilizer, and the organic potassium fertilizer is prepared by drying, granulating, drying at low temperature and finally packaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00113922 CN1285435A (en) | 2000-09-18 | 2000-09-18 | Sewage comprehensive treatment method for alkaline method straw pulp paper-making |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 00113922 CN1285435A (en) | 2000-09-18 | 2000-09-18 | Sewage comprehensive treatment method for alkaline method straw pulp paper-making |
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| CN1285435A true CN1285435A (en) | 2001-02-28 |
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| CN 00113922 Pending CN1285435A (en) | 2000-09-18 | 2000-09-18 | Sewage comprehensive treatment method for alkaline method straw pulp paper-making |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923880A (en) * | 2012-10-26 | 2013-02-13 | 陕西科技大学 | Technology for increasing number of recycle of papermaking white water |
| CN114477609A (en) * | 2020-11-10 | 2022-05-13 | 湖南天童环保有限公司 | Agent and process for treating and utilizing papermaking wastewater and waste residues |
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2000
- 2000-09-18 CN CN 00113922 patent/CN1285435A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923880A (en) * | 2012-10-26 | 2013-02-13 | 陕西科技大学 | Technology for increasing number of recycle of papermaking white water |
| CN102923880B (en) * | 2012-10-26 | 2014-04-16 | 陕西科技大学 | Technology for increasing number of recycle of papermaking white water |
| CN114477609A (en) * | 2020-11-10 | 2022-05-13 | 湖南天童环保有限公司 | Agent and process for treating and utilizing papermaking wastewater and waste residues |
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