CN116239252A - Pulping wastewater treatment method for non-wood fiber biomechanical pulp - Google Patents

Pulping wastewater treatment method for non-wood fiber biomechanical pulp Download PDF

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Publication number
CN116239252A
CN116239252A CN202310164583.0A CN202310164583A CN116239252A CN 116239252 A CN116239252 A CN 116239252A CN 202310164583 A CN202310164583 A CN 202310164583A CN 116239252 A CN116239252 A CN 116239252A
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treatment
pulping wastewater
wood fiber
wastewater
pulping
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Inventor
王东兴
慈晓雷
刘春兰
韩陈晓
智伟欣
许慧敏
秦滨财
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Shandong Kemai Bio Pulping Co ltd
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Shandong Kemai Bio Pulping Co ltd
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Priority to CN202310164583.0A priority Critical patent/CN116239252A/en
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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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes

Abstract

The invention provides a pulping wastewater treatment method for non-wood fiber biomechanical pulp, belonging to the field of pulping wastewater treatment. The processing method comprises the following steps: cooling, primary treatment, secondary treatment and post treatment. The pulping wastewater treatment method for the non-wood fiber biomechanical pulp effectively solves the problems of low water treatment efficiency and easy scaling of equipment caused by high silicon content in pulping wastewater of the non-wood fiber biomechanical pulp; meanwhile, the B/C value of the secondary treatment liquid is 0.45-0.48, so that the biochemical performance is good, and the treatment effect and the treatment efficiency of a subsequent biochemical sewage treatment system are effectively improved.

Description

Pulping wastewater treatment method for non-wood fiber biomechanical pulp
Technical Field
The invention relates to the field of pulping wastewater treatment, in particular to a pulping wastewater treatment method for non-wood fiber biomechanical pulp.
Background
The pulp is a fibrous substance prepared by taking plant fibers as raw materials and adopting different processing methods, and can be divided into mechanical pulp, chemical pulp and chemical mechanical pulp according to the processing methods, wood pulp, straw pulp, hemp pulp, reed pulp, cane pulp, bamboo pulp, broken cloth pulp and the like according to the used fiber raw materials, and can be divided into refined pulp, bleached pulp, unbleached pulp, high-yield pulp, semi-chemical pulp and the like according to different purities, wherein the refined pulp is generally used for manufacturing paper and paper boards, and is often used as a raw material for manufacturing cellulose derivatives such as cellulose esters, cellulose ethers and the like, and is also used in the fields of artificial fibers, plastics, coatings, films, gunpowder and the like.
In the prior art, the pulping process of the biomechanical pulp is between a mechanical pulping method and a chemical pulping method, and generally, under certain temperature and pressure conditions, biochemical reaction is carried out on lignin in non-wood fiber raw materials such as grass sheets, straws, wood and the like, non-wood cellulose is caused to absorb water and collapse a cellulose structure in a short time, and then the non-wood cellulose biomechanical pulp is prepared by combining the mechanical pulping method to be fluffed into pulp.
However, the inventor finds that in the pulping process of the existing non-lignocellulose biomechanical pulp, the content of substances such as dissolved substances, lignocellulose, sugar substances and the like in the generated waste water is low, meanwhile, as the silicon content of the non-lignocellulose raw material is higher than that of other lignocellulose raw materials, along with the dissolution of organic substances such as lignin, lipid substances and the like in the processes of alkalization, high-temperature softening and the like of pulping, silicon is separated out, so that the silicon content in the pulping waste water of the non-lignocellulose biomechanical pulp is high, and the traditional evaporation concentration type waste water treatment method is adopted, so that the waste water treatment efficiency is not high, the problem of scaling of evaporation concentration treatment equipment can occur, and the equipment cleaning and maintenance cost is high; meanwhile, after pulping wastewater of the non-wood fiber biomechanical pulp is treated by adopting a traditional wastewater treatment method, the B/C in the water is still lower than 0.3, the biochemical performance is poor, and the treatment effect is not ideal and the treatment efficiency is low after the treatment is carried out by adopting the existing biochemical sewage treatment system.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a pulping wastewater treatment method for non-wood fiber biomechanical pulp, which effectively solves the problems of low water treatment efficiency and easy scaling of equipment caused by high silicon content in pulping wastewater of the non-wood fiber biomechanical pulp; meanwhile, the biochemical performance of the treated wastewater can be effectively improved, and the treatment effect and the treatment efficiency of a subsequent biochemical sewage treatment system can be improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a pulping wastewater treatment process for non-lignocellulosic biomechanical pulp, the treatment process comprising the steps of: cooling, primary treatment, secondary treatment and post treatment.
Further, the temperature is reduced, and the pulping wastewater of the non-wood fiber biomechanical pulp is reduced to 60-65 ℃.
Further, the primary treatment is carried out by adding the polyaluminium chloride aqueous solution with the concentration of 10-12wt% into the cooled pulping wastewater, and stirring until the suspended matter content in the pulping wastewater exceeds 12000mg/L, thus obtaining primary treatment liquid.
Preferably, the addition rate of the polyaluminum chloride aqueous solution is 100-110L/h;
the weight ratio of the polyaluminum chloride aqueous solution to the pulping wastewater is 0.4-0.6:100.
Further, the secondary treatment is carried out by adding polyacrylamide into primary treatment liquid prepared by primary treatment according to the adding amount of 60-70ppm, stirring for 1-3h, and press-filtering to obtain secondary treatment liquid and mud cake.
Further, the post-treatment is carried out, the post-treatment agent is added into secondary treatment liquid prepared by secondary treatment, after stirring for 1-2 hours, solid matters are filtered out and are led into a biochemical sewage treatment system for biochemical sewage treatment;
the weight ratio of the post-treatment agent to the secondary treatment liquid is 3-5:100.
Further, the preparation method of the post-treatment agent comprises the following steps: pretreatment and modification;
the pretreatment, namely, putting the semi-coke powder with the particle size of 0.6-0.8mm into a reactor, continuously introducing carbon dioxide, heating to 400-500 ℃ at a heating rate of 8-10 ℃/min, preserving heat for 40-60min, and stopping introducing carbon dioxide; and then continuously introducing water vapor, heating to 750-850 ℃ at a heating rate of 12-15 ℃/min, and preserving heat for 30-40min to obtain the pretreated substance.
Preferably, the carbon dioxide is introduced at a rate of 180-240mL/min, and the water vapor is introduced at a rate of 130-180mL/min.
Further, the modification treatment is carried out by adding pretreated matter, fatty alcohol polyoxyethylene ether AEO-9 and hexadecyl trimethyl ammonium chloride into deionized water, stirring for 10-15h, filtering, and drying to obtain the final product.
Preferably, the weight ratio of the pretreatment to the fatty alcohol polyoxyethylene ether AEO-9 to the hexadecyl trimethyl ammonium chloride to the deionized water is 10-12:0.15-0.25:0.6-0.7:90-100.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the pulping wastewater treatment method for the non-wood fiber biomechanical pulp, the problems of low water treatment efficiency and easy scaling of equipment caused by high silicon content in pulping wastewater of the non-wood fiber biomechanical pulp are effectively solved by setting specific primary treatment, secondary treatment and post-treatment processes; meanwhile, the B/C value of the treated wastewater (namely secondary treatment liquid) is 0.45-0.48, so that the biochemical performance is good, and the treatment effect and the treatment efficiency of a subsequent biochemical sewage treatment system are effectively improved.
(2) The pulping wastewater treatment method for the non-wood fiber biomechanical pulp, disclosed by the invention, has the advantages that the temperature of secondary treatment liquid obtained after secondary treatment is 55-60 ℃, the pH value is 6.7-7.3, the lignin content is 270-291mg/L, the COD value is 7517-7810mg/L, the suspended matter content is 104-185mg/L, and the B/C value is 0.45-0.48; the mud cake has a thickness of 1.2-2.0mm, a dryness of 45-50%, an organic matter content of 72.7-78.3wt%, a lignin content of 61.3-66.0%, a low calorific value of 2094-2212 kcal/kg, and a pH value of 6.8-7.3.
(3) The pulping wastewater treatment method for the non-wood fiber biomechanical pulp of the invention is characterized in that after secondary treatment liquid treated by the post-treatment agent is led into a biochemical wastewater treatment system, the COD value of effluent of an anaerobic tower is 338-385mg/L, and the COD value of effluent of an aeration tank is 84-101mg/L; and the daily water treatment amount of the biochemical sewage treatment system is 8000m from the original water treatment system 3 Lifting to 12000m 3 Effectively improves the treatment efficiency and the treatment effect of biochemical sewage treatment.
(4) According to the pulping wastewater treatment method for the non-wood fiber biomechanical pulp, disclosed by the invention, in the wastewater treatment process, particularly in the process of adopting the plate heat exchanger to cool pulping wastewater, heat can be effectively recovered, the waste of the heat is reduced, the heat energy utilization rate is improved, the heat energy recycling is fully realized, and the problems of subsequent equipment loss and treatment efficiency reduction caused by high temperature of the pulping wastewater are effectively solved.
(5) The pulping wastewater treatment method for the non-wood fiber biomechanical pulp has the advantages of simple process method, high treatment efficiency, good treatment effect and stable working condition, and is suitable for large-scale pulping wastewater treatment of the non-wood fiber biomechanical pulp.
Detailed Description
Specific embodiments of the present invention will now be described in order to provide a clearer understanding of the technical features, objects and effects of the present invention.
Example 1
A pulping wastewater treatment method for non-wood fiber biomechanical pulp specifically comprises the following steps:
1. cooling down
And (3) introducing pulping wastewater of the non-wood fiber biomechanical pulp into the plate heat exchanger at an introducing rate of 150t/h, controlling the cold water flow rate of the plate heat exchanger to be 500t/h, controlling the cold water pressure to be 1.0MPa and the cold water pressure drop to be 15KPa, and cooling the pulping wastewater until the temperature of the pulping wastewater is 60 ℃.
Wherein, the pulping wastewater index of the non-wood fiber biomechanical pulp is that the pH value is 8.3, the temperature is 94 ℃, the lignin content is 20.2g/L, the COD value is 48766mg/L, and the suspended matter content is 2852mg/L.
2. One-time treatment
Introducing the cooled pulping wastewater into a filtrate tank, then adding an aqueous solution of polyaluminum chloride (PAC) at an addition rate of 100L/h, and stirring; during the stirring process, a large amount of muddy substances are separated out, and according to the detection of effluent, the muddy substances contain a large amount of fine fibers, lignin, saccharides and other substances; stirring until the content of suspended matters in pulping wastewater exceeds 12000mg/L, and obtaining primary treatment liquid.
Wherein, in the aqueous solution of polyaluminum chloride, the concentration of polyaluminum chloride is 10 weight percent.
The weight ratio of the polyaluminum chloride aqueous solution to the pulping wastewater is 0.4:100.
3. Secondary treatment
Adding Polyacrylamide (PAM) into the primary treatment liquid according to the addition amount of 60ppm, stirring and flocculating at 60rpm for 1h, and pumping at 60m by a plunger pump 3 Feeding the material to a plate-and-frame filter press at a feeding rate of/h, controlling the high-pressure feed liquid pressure of the plate-and-frame filter press to be 1.15MPa, the low-pressure feed liquid pressure to be 0.7MPa, the pressing pressure to be 1.5MPa, and performing filter pressing to obtain secondary treatment liquid and mud cakes; discharging mud cakes to solid waste treatment, and discharging secondary treatment liquid to post-treatment.
The secondary treatment solution had a temperature of 60 ℃, a pH of 7.3, a lignin content of 291mg/L, a COD value of 7810mg/L, a suspended matter content of 185mg/L and a B/C value of 0.45.
The mud cake had a thickness of 1.2mm, a dryness of 50%, an organic content of 72.7wt%, a lignin content of 61.3%, a low calorific value of 2094 kcal/kg and a pH of 7.3.
4. Post-treatment
And (3) introducing the secondary treatment liquid into a post-treatment tank, adding a post-treatment agent under stirring, stirring at 30rpm for 1h, filtering out solid matters, introducing the solid matters into a biochemical sewage treatment system, and performing biochemical sewage treatment to finish the treatment of pulping wastewater.
Wherein the weight ratio of the post-treatment agent to the secondary treatment liquid is 3:100.
The post-treatment agent is prepared by the following method:
1) Pretreatment of
Adding the semi-coke powder with the particle size of 0.6mm into a high-pressure reaction kettle with the volume of 5L, introducing carbon dioxide into the high-pressure reaction kettle at the introducing rate of 180mL/min, keeping introducing carbon dioxide after the air in the high-pressure reaction kettle is completely replaced, heating to 400 ℃ at the heating rate of 8 ℃/min, and stopping introducing carbon dioxide after the heat preservation is carried out for 40 min; then, water vapor is introduced at the rate of 130mL/min, the temperature is raised to 750 ℃ at the rate of 12 ℃/min, the temperature is kept for 30min, and the pretreated substance is prepared by natural cooling to normal temperature.
The specific surface area of the pretreated matter is 923m 2 And/g, wherein the micropore volume accounts for 74.2% of the total pore volume.
2) Modification treatment
Adding the pretreated substance, fatty alcohol polyoxyethylene ether AEO-9 and hexadecyl trimethyl ammonium chloride into deionized water, stirring for 10 hours, filtering out, and drying at 80 ℃ to constant weight to obtain the aftertreatment agent.
Wherein the weight ratio of the pretreatment to the fatty alcohol polyoxyethylene ether AEO-9 to the cetyl trimethyl ammonium chloride to the deionized water is 10:0.15:0.6:90.
After detection, in the embodiment, after the secondary treatment liquid treated by the post-treatment agent is led into a biochemical sewage treatment system, the COD value of the effluent of the anaerobic tower is 385mg/L, and the COD value of the effluent of the aeration tank is 101mg/L; and the daily water treatment amount of the biochemical sewage treatment system is 8000m from the original water treatment system 3 Lifting to 12000m 3 。
Example 2
A pulping wastewater treatment method for non-wood fiber biomechanical pulp specifically comprises the following steps:
1. cooling down
And (3) introducing pulping wastewater of the non-wood fiber biomechanical pulp into the plate heat exchanger at an introducing rate of 160t/h, controlling the cold water flow rate of the plate heat exchanger to be 530t/h, controlling the cold water pressure to be 1.1MPa and the cold water pressure drop to be 18KPa, and cooling the pulping wastewater until the temperature of the pulping wastewater is 60 ℃.
Wherein, the pulping wastewater index of the non-wood fiber biomechanical pulp is that the pH value is 8.3, the temperature is 94 ℃, the lignin content is 20.2g/L, the COD value is 48766mg/L, and the suspended matter content is 2852mg/L.
2. One-time treatment
Introducing the cooled pulping wastewater into a filtrate tank, then adding an aqueous solution of polyaluminum chloride (PAC) at an addition rate of 105L/h, and stirring; during the stirring process, a large amount of muddy substances are separated out, and according to the detection of effluent, the muddy substances contain a large amount of fine fibers, lignin, saccharides and other substances; stirring until the content of suspended matters in pulping wastewater exceeds 12000mg/L, and obtaining primary treatment liquid.
Wherein, in the polyaluminum chloride aqueous solution, the concentration of the polyaluminum chloride is 11 weight percent.
The weight ratio of the polyaluminum chloride aqueous solution to the pulping wastewater is 0.5:100.
3. Secondary treatment
Adding Polyacrylamide (PAM) into the primary treatment liquid according to the addition amount of 65ppm, stirring and flocculating for 2 hours at 75rpm, and then pumping with a plunger pump at a speed of 62m 3 Feeding the material to a plate-and-frame filter press at a feeding rate of/h, controlling the high-pressure feed liquid pressure of the plate-and-frame filter press to be 1.2MPa, the low-pressure feed liquid pressure to be 0.75MPa, the pressing pressure to be 1.8MPa, and performing filter pressing to obtain secondary treatment liquid and mud cakes; discharging mud cakes to solid waste treatment, and discharging secondary treatment liquid to post-treatment.
The secondary treatment solution has a temperature of 60 ℃, a pH value of 6.7, a lignin content of 280mg/L, a COD value of 7659mg/L, a suspended matter content of 144mg/L and a B/C value of 0.46.
The mud cake has a thickness of 1.6mm, a dryness of 46%, an organic content of 74.9wt%, a lignin content of 65.1%, a low calorific value 2145 kcal/kg and a pH value of 6.8.
4. Post-treatment
And (3) introducing the secondary treatment liquid into a post-treatment tank, adding a post-treatment agent under stirring, stirring at 50rpm for 1.5h, filtering out solid matters, introducing the solid matters into a biochemical sewage treatment system, and treating the biochemical sewage to finish the treatment of pulping wastewater.
Wherein the weight ratio of the post-treatment agent to the secondary treatment liquid is 4:100.
The post-treatment agent is prepared by the following method:
1) Pretreatment of
Adding the semi-coke powder with the particle size of 0.7mm into a high-pressure reaction kettle with the volume of 5L, introducing carbon dioxide into the high-pressure reaction kettle at the introducing rate of 220mL/min, keeping introducing carbon dioxide after the air in the high-pressure reaction kettle is completely replaced, heating to 450 ℃ at the heating rate of 9 ℃/min, and stopping introducing carbon dioxide after keeping the temperature for 50 min; then, water vapor is introduced at the introducing rate of 150mL/min, the temperature is raised to 800 ℃ at the heating rate of 13 ℃/min, the temperature is kept for 35min, and the pretreated substance is prepared by natural cooling to normal temperature.
The specific surface area of the pretreatment is 935m 2 And/g, wherein the micropore volume accounts for 76.0% of the total pore volume.
2) Modification treatment
Adding the pretreated substance, fatty alcohol polyoxyethylene ether AEO-9 and hexadecyl trimethyl ammonium chloride into deionized water, stirring for 12h, filtering, and drying at 80-90 ℃ to constant weight to obtain the aftertreatment agent.
Wherein the weight ratio of the pretreatment to the fatty alcohol polyoxyethylene ether AEO-9 to the cetyl trimethyl ammonium chloride to the deionized water is 11:0.2:0.65:95.
After detection, in the embodiment, after the secondary treatment liquid treated by the post-treatment agent is led into a biochemical sewage treatment system, the COD value of the effluent of the anaerobic tower is 367mg/L, and the COD value of the effluent of the aeration tank is 96mg/L; and the daily water treatment amount of the biochemical sewage treatment system is 8000m from the original water treatment system 3 Lifting to 12000m 3 。
Example 3
A pulping wastewater treatment method for non-wood fiber biomechanical pulp specifically comprises the following steps:
1. cooling down
And (3) introducing pulping wastewater of the non-wood fiber biomechanical pulp into the plate heat exchanger at an introduction rate of 170t/h, controlling the cold water flow rate of the plate heat exchanger to be 550t/h, controlling the cold water pressure to be 1.2MPa and the cold water pressure drop to be 20KPa, and cooling the pulping wastewater until the temperature of the pulping wastewater is 65 ℃.
Wherein, the pulping wastewater index of the non-wood fiber biomechanical pulp is that the pH value is 8.3, the temperature is 94 ℃, the lignin content is 20.2g/L, the COD value is 48766mg/L, and the suspended matter content is 2852mg/L.
2. One-time treatment
Introducing the cooled pulping wastewater into a filtrate tank, then adding an aqueous solution of polyaluminum chloride (PAC) at an addition rate of 110L/h, and stirring; during the stirring process, a large amount of muddy substances are separated out, and according to the detection of effluent, the muddy substances contain a large amount of fine fibers, lignin, saccharides and other substances; stirring until the content of suspended matters in pulping wastewater exceeds 12000mg/L, and obtaining primary treatment liquid.
Wherein, in the aqueous solution of polyaluminum chloride, the concentration of polyaluminum chloride is 12 weight percent.
The weight ratio of the polyaluminum chloride aqueous solution to the pulping wastewater is 0.6:100.
3. Secondary treatment
Adding Polyacrylamide (PAM) into the primary treatment liquid according to the addition amount of 70ppm, stirring and flocculating for 3 hours at 90rpm, and then pumping with a plunger pump at a speed of 65m 3 Feeding the material to a plate-and-frame filter press at a feeding rate of/h, controlling the high-pressure feed liquid pressure of the plate-and-frame filter press to be 1.25MPa, the low-pressure feed liquid pressure to be 0.8MPa, the pressing pressure to be 2.0MPa, and performing filter pressing to obtain secondary treatment liquid and mud cakes; discharging mud cakes to solid waste treatment, and discharging secondary treatment liquid to post-treatment.
The secondary treatment solution has a temperature of 55 ℃, a pH value of 6.9, a lignin content of 270mg/L, a COD value of 7517mg/L, a suspended matter content of 104mg/L and a B/C value of 0.48.
The mud cake has a thickness of 2mm, a dryness of 45%, an organic matter content of 78.3wt%, a lignin content of 66.0%, a low calorific value of 2212 kcal/kg and a pH value of 6.8.
4. Post-treatment
And (3) introducing the secondary treatment liquid into a post-treatment tank, adding a post-treatment agent under stirring, stirring at 60rpm for 2 hours, filtering out solid matters, introducing the solid matters into a biochemical sewage treatment system, and completing the treatment of pulping wastewater after biochemical sewage treatment.
Wherein the weight ratio of the post-treatment agent to the secondary treatment liquid is 5:100.
The post-treatment agent is prepared by the following method:
1) Pretreatment of
Adding the semi-coke powder with the particle size of 0.8mm into a high-pressure reaction kettle with the volume of 5L, introducing carbon dioxide into the high-pressure reaction kettle at the introducing rate of 240mL/min, keeping introducing carbon dioxide after the air in the high-pressure reaction kettle is completely replaced, heating to 500 ℃ at the heating rate of 10 ℃/min, and stopping introducing carbon dioxide after the heat preservation is carried out for 60 min; then, water vapor is introduced at the rate of 180mL/min, the temperature is raised to 850 ℃ at the rate of 15 ℃/min, the temperature is kept for 40min, and the pretreated substance is prepared by natural cooling to normal temperature.
The specific surface area of the pretreatment is 954m 2 And/g, wherein the micropore volume accounts for 77.3% of the total pore volume.
2) Modification treatment
Adding the pretreated substance, fatty alcohol polyoxyethylene ether AEO-9 and hexadecyl trimethyl ammonium chloride into deionized water, stirring for 15 hours, filtering, and drying at 90 ℃ to constant weight to obtain the aftertreatment agent.
Wherein the weight ratio of the pretreatment to the fatty alcohol polyoxyethylene ether AEO-9 to the cetyl trimethyl ammonium chloride to the deionized water is 12:0.25:0.7:100.
After detection, in the embodiment, after the secondary treatment liquid treated by the post-treatment agent is led into a biochemical sewage treatment system, the COD value of the effluent of the anaerobic tower is 338mg/L, and the COD value of the effluent of the aeration tank is 84mg/L; and the daily water treatment amount of the biochemical sewage treatment system is 8000m from the original water treatment system 3 Lifting to 12000m 3 。
Comparative example 1
In order to avoid unnecessary redundancy, the technical solution of embodiment 3 is different in that, in the post-treatment step, the addition of the post-treatment agent is omitted, and the secondary treatment solution is directly introduced into the biochemical sewage treatment system for biochemical sewage treatment.
Through detection, in the comparative example, the secondary treatment solution treated by the post-treatment agent is introduced into biochemical sewageAfter the treatment system is adopted, the COD value of the effluent of the anaerobic tower is 598mg/L, and the COD value of the effluent of the aeration tank is 285mg/L; and the daily water treatment amount of the biochemical sewage treatment system is 8000m from the original water treatment system 3 Lifting to 9500m 3 。
The percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for treating pulping wastewater for non-lignocellulosic biomechanical pulp, the method comprising the steps of: cooling, primary treatment, secondary treatment and post treatment.
2. The method for treating pulping wastewater for non-wood fiber biomechanical pulp according to claim 1, wherein the cooling cools the pulping wastewater of the non-wood fiber biomechanical pulp to 60-65 ℃.
3. The method for treating pulping wastewater for non-wood fiber biomechanical pulp according to claim 1, wherein the primary treatment is carried out by adding an aqueous solution of polyaluminium chloride with a concentration of 10-12wt% into the cooled pulping wastewater, and stirring until the suspended matter content in the pulping wastewater exceeds 12000mg/L, thereby obtaining primary treatment liquid.
4. A pulping wastewater treatment method for non-wood fiber biomechanical pulp according to claim 3, characterized in that the addition rate of the aqueous polyaluminum chloride solution is 100 to 110L/h;
the weight ratio of the polyaluminum chloride aqueous solution to the pulping wastewater is 0.4-0.6:100.
5. The method for treating pulping wastewater for non-wood fiber biomechanical pulp according to claim 1, wherein the secondary treatment comprises adding polyacrylamide into the primary treatment liquid prepared by the primary treatment in an amount of 60-70ppm, stirring for 1-3 hours, and press-filtering to obtain the secondary treatment liquid and a mud cake.
6. The method for treating pulping wastewater for non-wood fiber biomechanical pulp according to claim 1, wherein the post-treatment is carried out by adding a post-treatment agent into a secondary treatment liquid obtained by secondary treatment, stirring for 1-2 hours, filtering out solid matters, introducing into a biochemical wastewater treatment system, and carrying out biochemical wastewater treatment;
the weight ratio of the post-treatment agent to the secondary treatment liquid is 3-5:100.
7. The method for treating pulping wastewater for non-wood fiber biomechanical pulp according to claim 6, characterized in that the method for producing the post-treating agent comprises the steps of: pretreatment and modification;
the pretreatment, namely, putting the semi-coke powder with the particle size of 0.6-0.8mm into a reactor, continuously introducing carbon dioxide, heating to 400-500 ℃ at a heating rate of 8-10 ℃/min, preserving heat for 40-60min, and stopping introducing carbon dioxide; and then continuously introducing water vapor, heating to 750-850 ℃ at a heating rate of 12-15 ℃/min, and preserving heat for 30-40min to obtain the pretreated substance.
8. The method for pulping wastewater treatment of non-lignocellulosic biomechanical pulp according to claim 7, wherein the carbon dioxide is introduced at a rate of 180-240mL/min and the water vapor is introduced at a rate of 130-180mL/min.
9. The method for treating pulping wastewater for non-wood fiber biomechanical pulp according to claim 7, characterized in that the modification treatment comprises adding the pretreated substance, fatty alcohol polyoxyethylene ether AEO-9 and cetyl trimethyl ammonium chloride into deionized water, stirring for 10-15 hours, filtering out, and drying to obtain the post-treating agent.
10. The method for pulping wastewater treatment of non-wood fiber biomechanical pulp according to claim 9, wherein the ratio of the pretreatment, fatty alcohol polyoxyethylene ether AEO-9, cetyltrimethylammonium chloride and deionized water in parts by weight is 10-12:0.15-0.25:0.6-0.7:90-100.
CN202310164583.0A 2023-02-25 2023-02-25 Pulping wastewater treatment method for non-wood fiber biomechanical pulp Pending CN116239252A (en)

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