CN114573150A - Papermaking sewage treatment process - Google Patents

Papermaking sewage treatment process Download PDF

Info

Publication number
CN114573150A
CN114573150A CN202210349986.8A CN202210349986A CN114573150A CN 114573150 A CN114573150 A CN 114573150A CN 202210349986 A CN202210349986 A CN 202210349986A CN 114573150 A CN114573150 A CN 114573150A
Authority
CN
China
Prior art keywords
stirring
treatment process
hours
process according
wastewater treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210349986.8A
Other languages
Chinese (zh)
Inventor
韩胜国
胡勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zibo Xinhua Paper Co ltd
Original Assignee
Zibo Xinhua Paper Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zibo Xinhua Paper Co ltd filed Critical Zibo Xinhua Paper Co ltd
Priority to CN202210349986.8A priority Critical patent/CN114573150A/en
Publication of CN114573150A publication Critical patent/CN114573150A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/002—Mixed oxides other than spinels, e.g. perovskite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/24—Chromium, molybdenum or tungsten
    • B01J23/28—Molybdenum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/0272—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing elements other than those covered by B01J31/0201 - B01J31/0255
    • B01J31/0274—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing elements other than those covered by B01J31/0201 - B01J31/0255 containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/0272—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing elements other than those covered by B01J31/0201 - B01J31/0255
    • B01J31/0275—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing elements other than those covered by B01J31/0201 - B01J31/0255 also containing elements or functional groups covered by B01J31/0201 - B01J31/0269
    • B01J35/39—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/08—Heat treatment
    • B01J37/10—Heat treatment in the presence of water, e.g. steam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Abstract

The invention discloses a papermaking sewage treatment process, which comprises the steps of screening papermaking sewage, deslagging, filtering, recovering thicker fibers, separating finer fibers by air flotation, adding a flocculating agent, mixing and stirring under natural light, precipitating, separating solid from liquid to obtain sludge and clear water, transporting the sludge after dehydration, and directly discharging the clear water after filtration. The invention has simple process, good treatment effect on papermaking sewage, direct discharge and good popularization and application prospect.

Description

Papermaking sewage treatment process
Technical Field
The invention relates to a sewage treatment process, in particular to a papermaking sewage treatment process. Belongs to the technical field of sewage treatment.
Background
In recent years, with the development of global industrialization, environmental problems become more serious, especially water pollution directly threatens human health, and the problem becomes an urgent problem to be solved. The paper making process adopts timber, rice straw, reed, cloth, etc. as material and includes high temperature and high pressure steaming to separate out cellulose and produce paper pulp. The black liquor contains lignin, cellulose, volatile organic acid and the like, has odor and strong pollution, seriously pollutes water resources, causes ecological imbalance, seriously harms living environments of aquatic organisms, plants and human beings, and destroys the utilization value of the water resources.
Common sewage treatment methods include a sedimentation method, a biological decomposition method, an electrolysis method and the like, wherein the sedimentation method has poor effect, the biological decomposition method has poor control effect, and the electrolysis method has high cost. The most commonly adopted treatment method of the paper-making sewage at present is a chemical oxidation method, a flocculation precipitation method or the flocculation precipitation method, an anaerobic-aerobic biochemical method, and the key for determining the sewage treatment effect in the methods is a flocculating agent. The flocculant is used for aggregating colloidal substances and small suspended particles into large aggregates, so that the adsorption of the aggregates on various impurities of a solvent is improved, the substances are removed by means of a deposition flotation filtering process, and the subsequent biochemical treatment is facilitated.
The flocculating agents are various in types and can be divided into three types, namely inorganic flocculating agents, organic flocculating agents and microbial flocculating agents according to chemical components, wherein the three types are between the inorganic flocculating agents and the organic flocculating agents, and mixed and composite flocculating agents are also available. Because the papermaking wastewater has complex components, the flocculant on the market is used alone at present and cannot obtain ideal papermaking wastewater treatment effect.
Patent CN106745412B discloses a paper mill sewage treatment agent, which is prepared by mixing modified bagasse powder, polyacrylamide, ethyl maltol, chlorella powder, humic acid, soybean meal powder, lotus leaf ash, ferric chloride, kaolin, water, salicylic acid, potassium dihydrogen phosphate and the like as raw materials, and obtains sewage treatment effect by raw material compounding, but from the experimental data recorded in the sewage treatment agent, indexes such as COD, BOD, SS, metal ion content and the like after sewage treatment are not ideal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a papermaking wastewater treatment process which has good treatment effect on papermaking wastewater and can be directly discharged.
In order to achieve the purpose, the invention adopts the following technical scheme:
a papermaking sewage treatment process, papermaking sewage is screened and discharged, filtered and recycled to have thicker fibers, air-floated and separated to have finer fibers, then a flocculating agent is added, mixed and stirred under natural light, precipitated, and subjected to solid-liquid separation to obtain sludge and clear water, the sludge is transported outside after being dehydrated, and the clear water is directly discharged after being filtered; the preparation method of the flocculant comprises the following steps:
(1) firstly, taking bismuth nitrate and sodium molybdate as raw materials, and obtaining nano bismuth molybdate through hydrothermal reaction;
(2) adding titanium tetrachloride, yttrium trichloride and molybdenum pentachloride into absolute ethyl alcohol, stirring and dispersing uniformly, then slowly adding sodium citrate, stirring and reacting, transferring to a reaction kettle for hydrothermal reaction, filtering, washing, drying, calcining in nitrogen atmosphere, and naturally cooling to room temperature to obtain the titanium-yttrium-molybdenum oxide nano composite material;
(3) and (2) uniformly mixing the nano bismuth molybdate obtained in the step (1) and the titanium-yttrium-molybdenum oxide nano composite material obtained in the step (2) to obtain premixed powder, and then performing surface modification on the premixed powder by using gamma-aminopropyltriethoxysilane and 4-aminophenyl-alpha-D mannopyranoside to obtain the flocculant.
Preferably, a cylinder filter is used for filtering and recycling coarse fibers, an air floatation tank is used for separating fine fibers, and the operating parameters of the air floatation tank are as follows: flow of air flow meter of dissolved air tank: 1 to 1.3m3H, inlet pressure: 0.55-0.6 Mpa, outlet pressure: 0.48-0.5 MPa; water treatment amount: 800 to 900m3H; and emptying the air floatation tank emptying valve for 1-2 times every 8 hours, and 10-15 seconds every time.
Preferably, the addition amount of the flocculating agent in the papermaking wastewater is 10-20 ppm.
Preferably, the mixing and stirring comprises: stirring at 3000-5000 r/min for 8-10 min, and stirring at 300-500 r/min for 3-4 h.
Preferably, the sand filter is used for realizing clear water filtration, the filtration speed is 18-20 m/h, the water backwashing period is 15-17 hours, and the water washing strength is 13-15L/m2·s。
Further preferably, the sand filter tank sequentially comprises from top to bottom: a ceramsite layer with the diameter of 1.5-1.8 mm, a quartz sand layer with the diameter of 1.2-1.4 mm, a quartz sand layer with the diameter of 0.6-0.8 mm, a cobble layer with the diameter of 4-8 mm, a cobble layer with the diameter of 10-18 mm and a cobble layer with the diameter of 20-25 mm; wherein the thickness of the ceramsite layer and the quartz sand is 300mm, and the thickness of the cobble layer is 120 mm.
Preferably, the specific method of the step (1) comprises the following steps in parts by weight: adding 7.9 parts of bismuth nitrate into 25-30 parts of ethylene glycol, uniformly stirring and dispersing, then adding 2.42 parts of sodium molybdate, uniformly stirring and dispersing, adding 70-80 parts of absolute ethyl alcohol, uniformly dispersing by ultrasonic waves, then transferring to a reaction kettle, carrying out hydrothermal reaction at 130-140 ℃ for 10-11 hours, naturally cooling to room temperature, centrifuging, washing, and drying to obtain the nano bismuth molybdate.
Preferably, in the step (2), the mass ratio of titanium tetrachloride, yttrium trichloride, molybdenum pentachloride, absolute ethyl alcohol and sodium citrate is 3-5: 0.08-0.1: 0.02-0.03: 35-45: 10 to 12.
Preferably, in the step (2), the hydrothermal reaction has the following process conditions: hydrothermal reaction at 170-180 ℃ for 20-22 hours.
Preferably, in the step (2), the calcination process conditions are as follows: calcining at 500-520 ℃ for 7-9 hours.
Preferably, in the step (3), the mass ratio of the nano bismuth molybdate to the titanium-yttrium-molybdenum oxide nano composite material is 10: 1 to 2.
Preferably, in the step (3), the surface modification method of the premixed powder comprises the following steps in parts by weight: firstly, dispersing 10 parts of premixed powder in 30-40 parts of absolute ethyl alcohol by ultrasonic waves, then adding 3-4 parts of gamma-aminopropyltriethoxysilane, heating to reflux, stirring for 5-7 hours under heat preservation, then adding 1-2 parts of 4-aminophenyl-alpha-D mannopyranoside, stirring for 2-3 hours under heat preservation, naturally cooling to room temperature, centrifuging, taking precipitate, and drying.
The invention has the beneficial effects that:
the method comprises the steps of screening papermaking sewage, deslagging, filtering, recovering thicker fibers, separating finer fibers by air flotation, adding a flocculating agent, mixing and stirring under natural light, precipitating, carrying out solid-liquid separation to obtain sludge and clear water, dewatering the sludge, transporting the sludge out, and directly discharging the clear water after filtering. The invention has simple process, good treatment effect on papermaking sewage, direct discharge and good popularization and application prospect.
The technical key point of the invention is that the flocculant is prepared by the following steps: firstly, taking bismuth nitrate and sodium molybdate as raw materials, and obtaining nano bismuth molybdate through hydrothermal reaction; adding titanium tetrachloride, yttrium trichloride and molybdenum pentachloride into absolute ethyl alcohol, stirring and dispersing uniformly, then slowly adding sodium citrate, stirring and reacting, transferring to a reaction kettle for hydrothermal reaction, filtering, washing, drying, calcining in nitrogen atmosphere, and naturally cooling to room temperature to obtain the titanium-yttrium-molybdenum oxide nano composite material; and then uniformly mixing the nano bismuth molybdate and the titanium-yttrium-molybdenum oxide nano composite material to obtain premixed powder, and performing surface modification on the premixed powder by using gamma-aminopropyltriethoxysilane and 4-aminophenyl-alpha-D mannopyranoside to obtain the nano bismuth molybdate/titanium-yttrium-molybdenum oxide nano composite material. The flocculant has double effects of adsorbing and flocculating and degrading pollutants through photocatalysis, and is specifically analyzed as follows:
1. the bismuth molybdate can absorb ultraviolet light to be excited so as to degrade pollutants in the papermaking sewage, but the bismuth molybdate has narrow response to visible light, and a photoproduction electron-hole pair is easy to compound.
2. The invention mixes nano bismuth molybdate and titanium-yttrium-molybdenum oxide nano composite material to prepare premixed powder, uses gamma-aminopropyl triethoxysilane and 4-aminophenyl-alpha-D mannopyranoside to carry out surface modification, introduces amino and hydroxyl, improves the dispersibility in papermaking sewage, promotes adsorption flocculation and improves the sewage treatment effect.
Detailed Description
The present invention will be further illustrated by the following examples, which are intended to be merely illustrative and not limitative.
Example 1:
a papermaking sewage treatment process, papermaking sewage is screened and discharged, coarse fibers are recovered by filtration, fine fibers are separated by air flotation, then 10ppm of flocculating agent is added, mixing and stirring are carried out under natural light, precipitation and solid-liquid separation are carried out to obtain sludge and clear water, the sludge is transported outside after dehydration, and the clear water is directly discharged after filtration; the preparation method of the flocculant comprises the following steps:
(1) adding 7.9g of bismuth nitrate into 25g of ethylene glycol, uniformly stirring and dispersing, then adding 2.42g of sodium molybdate, uniformly stirring and dispersing, adding 70g of absolute ethyl alcohol, uniformly dispersing by ultrasonic waves, then transferring to a reaction kettle, carrying out hydrothermal reaction at 130 ℃ for 10 hours, naturally cooling to room temperature, centrifuging, washing and drying to obtain nano bismuth molybdate;
(2) adding 3g of titanium tetrachloride, 0.08g of yttrium trichloride and 0.02g of molybdenum pentachloride into 35g of absolute ethyl alcohol, stirring and dispersing uniformly, then slowly adding 10g of sodium citrate, stirring and reacting, transferring to a reaction kettle, carrying out hydrothermal reaction at 170 ℃ for 20 hours, filtering, washing, drying, calcining at 500 ℃ for 7 hours in a nitrogen atmosphere, and naturally cooling to room temperature to obtain the titanium-yttrium-molybdenum oxide nano composite material;
(3) and then uniformly mixing 5g of nano bismuth molybdate and 0.5g of titanium-yttrium-molybdenum oxide nano composite material to obtain premixed powder, and performing surface modification on the premixed powder by using gamma-aminopropyltriethoxysilane and 4-aminophenyl-alpha-D mannopyranoside to obtain the flocculant.
The method comprises the following steps of utilizing a rotary screen filter to realize filtration and recovery of coarse fibers, utilizing an air flotation tank to realize fine fiber separation, and operating parameters of the air flotation tank are as follows: flow of air flow meter of dissolved air tank: 1m3H, inlet pressure: 0.55Mpa, outlet pressure: 0.48 MPa; water treatment amount: 800m3H; the air flotation tank emptying valve is emptied 1 time every 8 hours, 10 seconds each time.
The mixing and stirring process comprises the following steps: stirring at 3000r/min for 8 min and at 300r/min for 3 hr.
The sand filter is used for realizing the filtration of clear water, the filtration speed is 18m/h, the water back-flushing period is 15 hours, and the washing strength is 13L/m2·s。
From top to bottom in the sand filter tank are as follows: a ceramsite layer with the diameter of 1.5mm, a quartz sand layer with the diameter of 1.2mm, a quartz sand layer with the diameter of 0.6mm, a cobblestone layer with the diameter of 4mm, a cobblestone layer with the diameter of 10mm and a cobblestone layer with the diameter of 20 mm; wherein the thickness of the ceramsite layer and the quartz sand is 300mm, and the thickness of the cobble layer is 120 mm.
In the step (3), the surface modification method of the premixed powder comprises the following steps: firstly, dispersing 10g of premixed powder in 30g of absolute ethyl alcohol by ultrasonic waves, then adding 3g of gamma-aminopropyltriethoxysilane, heating to reflux, keeping the temperature and stirring for 5 hours, then adding 3g of 4-aminophenyl-alpha-D mannopyranoside, keeping the temperature and stirring for 2 hours, naturally cooling to room temperature, centrifuging to obtain precipitates, and drying.
Example 2:
a papermaking sewage treatment process, papermaking sewage is screened and discharged, coarse fibers are recovered by filtration, fine fibers are separated by air flotation, 20ppm of flocculating agent is added, mixing and stirring are carried out under natural light, precipitation and solid-liquid separation are carried out to obtain sludge and clear water, the sludge is transported outside after dehydration, and the clear water is directly discharged after filtration; the preparation method of the flocculant comprises the following steps:
(1) adding 7.9g of bismuth nitrate into 30g of ethylene glycol, uniformly stirring and dispersing, then adding 2.42g of sodium molybdate, uniformly stirring and dispersing, adding 80g of absolute ethyl alcohol, uniformly dispersing by ultrasonic waves, then transferring to a reaction kettle, carrying out hydrothermal reaction at 140 ℃ for 11 hours, naturally cooling to room temperature, centrifuging, washing and drying to obtain nano bismuth molybdate;
(2) adding 5g of titanium tetrachloride, 0.1g of yttrium trichloride and 0.03g of molybdenum pentachloride into 45g of absolute ethyl alcohol, stirring and dispersing uniformly, then slowly adding 12g of sodium citrate, stirring and reacting, transferring to a reaction kettle, carrying out hydrothermal reaction at 180 ℃ for 22 hours, filtering, washing, drying, calcining at 520 ℃ for 9 hours under the nitrogen atmosphere, and naturally cooling to room temperature to obtain the titanium-yttrium-molybdenum oxide nanocomposite;
(3) and then uniformly mixing 5g of nano bismuth molybdate and 1g of titanium-yttrium-molybdenum oxide nano composite material to obtain premixed powder, and performing surface modification on the premixed powder by utilizing gamma-aminopropyltriethoxysilane and 4-aminophenyl-alpha-D mannopyranoside to obtain the flocculant.
The method comprises the following steps of utilizing a rotary screen filter to realize filtration and recovery of coarse fibers, utilizing an air flotation tank to realize fine fiber separation, and operating parameters of the air flotation tank are as follows: flow of air flow meter of dissolved air tank: 1.3m3H, inlet pressure: 0.6Mpa, outlet pressure: 0.5 MPa; water treatment amount: 900m3H; emptying of air flotation tankThe valve was emptied 2 times every 8 hours for 15 seconds each.
The mixing and stirring process comprises the following steps: stirring at 5000r/min for 10 min and at 500r/min for 4 h.
The sand filter is used for realizing the filtration of clean water, the filtration speed is 20m/h, the water backwashing period is 17 hours, and the washing strength is 15L/m2·s。
From top to bottom in the sand filter tank are as follows: a ceramsite layer with the diameter of 1.8mm, a quartz sand layer with the diameter of 1.4mm, a quartz sand layer with the diameter of 0.8mm, a cobblestone layer with the diameter of 8mm, a cobblestone layer with the diameter of 18mm and a cobblestone layer with the diameter of 25 mm; wherein the thickness of the ceramsite layer and the quartz sand is 300mm, and the thickness of the cobble layer is 120 mm.
In the step (3), the surface modification method of the premixed powder comprises the following steps: firstly, dispersing 10g of premixed powder in 40g of absolute ethyl alcohol by ultrasonic waves, then adding 4g of gamma-aminopropyltriethoxysilane, heating to reflux, keeping the temperature and stirring for 7 hours, then adding 4g of 4-aminophenyl-alpha-D mannopyranoside, keeping the temperature and stirring for 3 hours, naturally cooling to room temperature, centrifuging to obtain precipitates, and drying.
Example 3:
a papermaking sewage treatment process, papermaking sewage is screened and discharged, coarse fibers are recovered by filtration, fine fibers are separated by air flotation, then 15ppm of flocculating agent is added, mixing and stirring are carried out under natural light, precipitation and solid-liquid separation are carried out to obtain sludge and clear water, the sludge is transported outside after dehydration, and the clear water is directly discharged after filtration; the preparation method of the flocculant comprises the following steps:
(1) adding 7.9g of bismuth nitrate into 28g of ethylene glycol, uniformly stirring and dispersing, then adding 2.42g of sodium molybdate, uniformly stirring and dispersing, adding 75g of absolute ethyl alcohol, uniformly dispersing by ultrasonic waves, then transferring to a reaction kettle, carrying out hydrothermal reaction at 135 ℃ for 10 hours, naturally cooling to room temperature, centrifuging, washing and drying to obtain nano bismuth molybdate;
(2) adding 4g of titanium tetrachloride, 0.09g of yttrium trichloride and 0.025g of molybdenum pentachloride into 40g of absolute ethyl alcohol, stirring and dispersing uniformly, then slowly adding 11g of sodium citrate, stirring and reacting, transferring to a reaction kettle, carrying out hydrothermal reaction at 175 ℃ for 21 hours, filtering, washing, drying, calcining at 510 ℃ for 8 hours in a nitrogen atmosphere, and naturally cooling to room temperature to obtain the titanium-yttrium-molybdenum oxide nano composite material;
(3) and then uniformly mixing 5g of nano bismuth molybdate and 0.7g of titanium-yttrium-molybdenum oxide nano composite material to obtain premixed powder, and performing surface modification on the premixed powder by using gamma-aminopropyltriethoxysilane and 4-aminophenyl-alpha-D mannopyranoside to obtain the flocculant.
The method comprises the following steps of utilizing a rotary screen filter to realize filtration and recovery of coarse fibers, utilizing an air flotation tank to realize fine fiber separation, and operating parameters of the air flotation tank are as follows: flow of air flow meter of dissolved air tank: 1.2m3H, inlet pressure: 0.6Mpa, outlet pressure: 0.5 MPa; water treatment amount: 850m3H; the emptying valve of the air flotation tank is emptied for 12 seconds every 8 hours for 2 times.
The mixing and stirring process comprises the following steps: stirring at 4000r/min for 9 minutes and at 400r/min for 3 hours.
The sand filter is used for realizing the filtration of clean water, the filtration speed is 19m/h, the water back-flushing period is 16 hours, and the washing strength is 14L/m2·s。
From top to bottom in the sand filter tank are as follows: a ceramsite layer with the diameter of 1.6mm, a quartz sand layer with the diameter of 1.3mm, a quartz sand layer with the diameter of 0.7mm, a cobblestone layer with the diameter of 6mm, a cobblestone layer with the diameter of 15mm and a cobblestone layer with the diameter of 22 mm; wherein the thickness of the ceramsite layer and the quartz sand is 300mm, and the thickness of the cobble layer is 120 mm.
In the step (3), the surface modification method of the premixed powder comprises the following steps: firstly, dispersing 10g of premixed powder in 35g of absolute ethyl alcohol by ultrasonic waves, then adding 3.5g of gamma-aminopropyltriethoxysilane, heating to reflux, stirring for 6 hours under heat preservation, then adding 3.5g of 4-aminophenyl-alpha-D mannopyranoside, stirring for 3 hours under heat preservation, naturally cooling to room temperature, centrifuging, taking precipitate, and drying.
Comparative example 1
A papermaking sewage treatment process, papermaking sewage is screened and discharged, coarse fibers are recovered by filtration, fine fibers are separated by air flotation, then 10ppm of flocculating agent is added, mixing and stirring are carried out under natural light, precipitation and solid-liquid separation are carried out to obtain sludge and clear water, the sludge is transported outside after dehydration, and the clear water is directly discharged after filtration; the preparation method of the flocculant comprises the following steps:
(1) adding 7.9g of bismuth nitrate into 25g of ethylene glycol, uniformly stirring and dispersing, then adding 2.42g of sodium molybdate, uniformly stirring and dispersing, adding 70g of absolute ethyl alcohol, uniformly dispersing by ultrasonic waves, then transferring to a reaction kettle, carrying out hydrothermal reaction at 130 ℃ for 10 hours, naturally cooling to room temperature, centrifuging, washing and drying to obtain nano bismuth molybdate;
(2) and then carrying out surface modification on the nano bismuth molybdate by utilizing gamma-aminopropyltriethoxysilane and 4-aminophenyl-alpha-D mannopyranoside to obtain the flocculant.
The method comprises the following steps of utilizing a rotary screen filter to realize filtration and recovery of coarse fibers, utilizing an air flotation tank to realize fine fiber separation, and operating parameters of the air flotation tank are as follows: flow of air flow meter of dissolved air tank: 1m3H, inlet pressure: 0.55Mpa, outlet pressure: 0.48 MPa; water treatment amount: 800m3H; the emptying valve of the air flotation tank is emptied for 1 time every 8 hours, and each time lasts for 10 seconds.
The mixing and stirring process comprises the following steps: stirring at 3000r/min for 8 min and at 300r/min for 3 hr.
The sand filter is used for realizing the filtration of clear water, the filtration speed is 18m/h, the water back-flushing period is 15 hours, and the washing strength is 13L/m2·s。
The sand filter tank sequentially comprises the following components from top to bottom: a ceramsite layer with the diameter of 1.5mm, a quartz sand layer with the diameter of 1.2mm, a quartz sand layer with the diameter of 0.6mm, a cobblestone layer with the diameter of 4mm, a cobblestone layer with the diameter of 10mm and a cobblestone layer with the diameter of 20 mm; wherein the thickness of the ceramsite layer and the quartz sand is 300mm, and the thickness of the cobble layer is 120 mm.
In the step (2), the surface modification method is as follows: firstly, 10g of nano bismuth molybdate is dispersed in 30g of absolute ethyl alcohol by ultrasonic waves, then 3g of gamma-aminopropyltriethoxysilane is added, the mixture is heated to reflux, the mixture is stirred for 5 hours under the condition of heat preservation, then 3g of 4-aminophenyl-alpha-D mannopyranoside is added, the mixture is stirred for 2 hours under the condition of heat preservation, the mixture is naturally cooled to the room temperature, and the precipitate is obtained by centrifugation and drying.
Comparative example 2
A papermaking sewage treatment process, papermaking sewage is screened and discharged, coarse fibers are recovered by filtration, fine fibers are separated by air flotation, then 10ppm of flocculating agent is added, mixing and stirring are carried out under natural light, precipitation and solid-liquid separation are carried out to obtain sludge and clear water, the sludge is transported outside after dehydration, and the clear water is directly discharged after filtration; the preparation method of the flocculant comprises the following steps:
(1) adding 7.9g of bismuth nitrate into 25g of ethylene glycol, uniformly stirring and dispersing, then adding 2.42g of sodium molybdate, uniformly stirring and dispersing, adding 70g of absolute ethyl alcohol, uniformly dispersing by ultrasonic waves, then transferring to a reaction kettle, carrying out hydrothermal reaction at 130 ℃ for 10 hours, naturally cooling to room temperature, centrifuging, washing and drying to obtain nano bismuth molybdate;
(2) adding 3g of titanium tetrachloride, 0.08g of yttrium trichloride and 0.02g of molybdenum pentachloride into 35g of absolute ethyl alcohol, stirring and dispersing uniformly, then slowly adding 10g of sodium citrate, stirring and reacting, transferring into a reaction kettle, carrying out hydrothermal reaction at 170 ℃ for 20 hours, filtering, washing, drying, calcining at 500 ℃ for 7 hours in nitrogen atmosphere, and naturally cooling to room temperature to obtain the titanium-yttrium-molybdenum oxide nano composite material;
(3) then, 5g of nano bismuth molybdate and 0.5g of titanium-yttrium-molybdenum oxide nano composite material are uniformly mixed to obtain premixed powder, and then the surface of the premixed powder is modified by utilizing gamma-aminopropyltriethoxysilane to obtain the flocculant.
The method comprises the following steps of utilizing a rotary screen filter to realize filtration and recovery of coarse fibers, utilizing an air flotation tank to realize fine fiber separation, and operating parameters of the air flotation tank are as follows: flow of air flow meter of dissolved air tank: 1m3H, inlet pressure: 0.55Mpa, outlet pressure: 0.48 MPa; water treatment amount: 800m3H; the emptying valve of the air flotation tank is emptied for 1 time every 8 hours, and each time lasts for 10 seconds.
The mixing and stirring process comprises the following steps: stirring at 3000r/min for 8 min and at 300r/min for 3 hr.
The sand filter is used for realizing the filtration of clear water, the filtration speed is 18m/h, the water back-flushing period is 15 hours, and the washing strength is 13L/m2·s。
From top to bottom in the sand filter tank are as follows: a ceramsite layer with the diameter of 1.5mm, a quartz sand layer with the diameter of 1.2mm, a quartz sand layer with the diameter of 0.6mm, a cobblestone layer with the diameter of 4mm, a cobblestone layer with the diameter of 10mm and a cobblestone layer with the diameter of 20 mm; wherein the thickness of the ceramsite layer and the quartz sand is 300mm, and the thickness of the cobble layer is 120 mm.
In the step (3), the surface modification method of the premixed powder comprises the following steps: firstly, 10g of premixed powder is dispersed in 30g of absolute ethyl alcohol by ultrasonic waves, then 3g of gamma-aminopropyltriethoxysilane is added, the mixture is heated to reflux, the mixture is kept warm and stirred for 7 hours, the mixture is naturally cooled to the room temperature, and precipitates are obtained by centrifugation and drying.
The treatment processes of examples 1 to 3 and comparative examples 1 and 2 were respectively used for treating the sewage of a certain paper mill, and the water quality before and after treatment was examined with reference to GB/T18918-2016, and the results are shown in Table 1.
TABLE 1 comparison of the effects of the wastewater treatment
Figure BDA0003579418100000081
As can be seen from Table 1, the treatment process of the embodiments 1 to 3 has good treatment effect on the papermaking sewage, and indexes such as COD, BOD, SS, chromaticity and the like of the treated effluent are far lower than the national standard and can be directly discharged.
The titanium-yttrium-molybdenum oxide nano composite material is omitted in the comparative example 1, the surface modification of 4-aminophenyl-alpha-D mannopyranoside is omitted in the comparative example 2, and the treatment effects are obviously poor, so that the nano bismuth molybdate and titanium-yttrium-molybdenum oxide nano composite material has a synergistic effect, improves adsorption flocculation and catalytic degradation effects, and improves the sewage treatment effect together with necessary surface modification.
Although the present invention has been described with reference to the specific embodiments, it is not intended to limit the scope of the present invention, and various modifications and variations can be made by those skilled in the art without inventive changes based on the technical solution of the present invention.

Claims (10)

1. A papermaking sewage treatment process is characterized in that papermaking sewage is subjected to screening, deslagging, filtering, coarse fiber recovery, air flotation separation of fine fibers, flocculating agent addition, mixing and stirring under natural light, precipitation, solid-liquid separation to obtain sludge and clear water, sludge is transported outside after dehydration, and clear water is directly discharged after filtration; the preparation method of the flocculant comprises the following steps:
(1) firstly, taking bismuth nitrate and sodium molybdate as raw materials, and obtaining nano bismuth molybdate through hydrothermal reaction;
(2) adding titanium tetrachloride, yttrium trichloride and molybdenum pentachloride into absolute ethyl alcohol, stirring and dispersing uniformly, then slowly adding sodium citrate, stirring and reacting, transferring to a reaction kettle for hydrothermal reaction, filtering, washing, drying, calcining in nitrogen atmosphere, and naturally cooling to room temperature to obtain the titanium-yttrium-molybdenum oxide nano composite material;
(3) and (3) uniformly mixing the nano bismuth molybdate obtained in the step (1) and the titanium-yttrium-molybdenum oxide nano composite material obtained in the step (2) to obtain premixed powder, and then performing surface modification on the premixed powder by using gamma-aminopropyltriethoxysilane and 4-aminophenyl-alpha-D mannopyranoside to obtain the flocculant.
2. The papermaking wastewater treatment process according to claim 1, wherein a cylinder filter is used for filtering and recovering coarse fibers, an air flotation tank is used for separating fine fibers, and the operating parameters of the air flotation tank are as follows: flow of air flow meter of dissolved air tank: 1 to 1.3m3H, inlet pressure: 0.55-0.6 Mpa, outlet pressure: 0.48-0.5 MPa; water treatment amount: 800 to 900m3H; and emptying the air floatation tank emptying valve for 1-2 times every 8 hours, and 10-15 seconds every time.
3. The papermaking wastewater treatment process according to claim 1, wherein the addition amount of the flocculating agent in the papermaking wastewater is 10-20 ppm.
4. The papermaking wastewater treatment process according to claim 1, wherein the mixing and stirring step comprises: stirring at 3000-5000 r/min for 8-10 minutes, and stirring at 300-500 r/min for 3-4 hours.
5. The papermaking wastewater treatment process according to claim 1, characterized in thatThe sand filter is used for filtering clear water, the filtering speed is 18-20 m/h, the water backwashing period is 15-17 hours, and the water washing strength is 13-15L/m2·s。
6. The papermaking wastewater treatment process according to claim 1, wherein the specific method in the step (1) comprises the following steps in parts by weight: adding 7.9 parts of bismuth nitrate into 25-30 parts of ethylene glycol, uniformly stirring and dispersing, then adding 2.42 parts of sodium molybdate, uniformly stirring and dispersing, adding 70-80 parts of absolute ethyl alcohol, uniformly dispersing by ultrasonic waves, then transferring to a reaction kettle, carrying out hydrothermal reaction at 130-140 ℃ for 10-11 hours, naturally cooling to room temperature, centrifuging, washing, and drying to obtain the nano bismuth molybdate.
7. The papermaking wastewater treatment process according to claim 1, wherein in the step (2), the mass ratio of titanium tetrachloride, yttrium trichloride, molybdenum pentachloride, absolute ethyl alcohol and sodium citrate is 3-5: 0.08-0.1: 0.02-0.03: 35-45: 10 to 12.
8. The papermaking wastewater treatment process according to claim 1, wherein in the step (2), the hydrothermal reaction is carried out under the following process conditions: hydrothermal reaction at 170-180 ℃ for 20-22 hours.
9. The papermaking wastewater treatment process according to claim 1, wherein in the step (2), the calcination process conditions are as follows: calcining for 7-9 hours at 500-520 ℃.
10. The papermaking wastewater treatment process according to claim 1, wherein in the step (3), the mass ratio of the nano bismuth molybdate to the titanium-yttrium-molybdenum oxide nano composite material is 10: 1 to 2.
CN202210349986.8A 2022-04-02 2022-04-02 Papermaking sewage treatment process Pending CN114573150A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210349986.8A CN114573150A (en) 2022-04-02 2022-04-02 Papermaking sewage treatment process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210349986.8A CN114573150A (en) 2022-04-02 2022-04-02 Papermaking sewage treatment process

Publications (1)

Publication Number Publication Date
CN114573150A true CN114573150A (en) 2022-06-03

Family

ID=81778976

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210349986.8A Pending CN114573150A (en) 2022-04-02 2022-04-02 Papermaking sewage treatment process

Country Status (1)

Country Link
CN (1) CN114573150A (en)

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1265378A (en) * 1999-10-29 2000-09-06 中山联合鸿兴造纸有限公司 Paper-making waste water treating agent and treating process
CN1654497A (en) * 2005-01-14 2005-08-17 华南理工大学 Chitosan graft ternary polymerization polymeric flocculant and its preparation method and use
EP2407419A1 (en) * 2010-07-16 2012-01-18 Universiteit Twente Photocatalytic water splitting
CN102357360A (en) * 2011-09-07 2012-02-22 南昌航空大学 Catalyst for degrading rhodamine B by photocatalysis, and preparation method thereof
CN103657634A (en) * 2013-12-31 2014-03-26 长沙理工大学 Preparation method of visible light catalysis material for graphene/bismuth molybdate nanobelt
CN105174396A (en) * 2015-09-02 2015-12-23 铜陵梧桐树农业发展有限公司 Flocculant
WO2016040875A1 (en) * 2014-09-12 2016-03-17 Nitto Denko Corporation Multivalence semiconductor photocatalytic materials
CN106268768A (en) * 2016-08-04 2017-01-04 苏州德捷膜材料科技有限公司 A kind of preparation with visible light-responded antimony yttrium molybdate nano-photocatalyst and light degradation application
JP6073520B1 (en) * 2015-07-31 2017-02-01 Toto株式会社 Photocatalyst material and method for producing the same
CN106925258A (en) * 2015-12-30 2017-07-07 中国科学院上海硅酸盐研究所 A kind of new Mo-Ti monocrystalline oxides nano material and its preparation and application
CN108786786A (en) * 2018-07-17 2018-11-13 河南科技大学 A kind of photocatalytic degradation nanometer MoO3The preparation method of powder
CN108940261A (en) * 2018-06-22 2018-12-07 江苏大学 A kind of Preparation method and use for integrating homojunction and heterojunction composite photocatalyst
CN110038616A (en) * 2019-04-23 2019-07-23 襄阳先创环保科技有限公司 A kind of municipal sewage treatment agent
US20190247832A1 (en) * 2017-05-27 2019-08-15 Beifang Minzu University MEHTOD FOR HYDROTHERMAL SYNTHESIS OF THREE DIMENSIONAL Bi4MoO9/TiO2 NANOSTRUCTURE HETEROJUNCTION
CN111215119A (en) * 2020-03-05 2020-06-02 浙江大学 Preparation method of surface dispersion type nano bismuth molybdate composite photocatalytic material
CN111362386A (en) * 2020-03-26 2020-07-03 宋庆红 Environment-friendly sewage treatment flocculant and preparation method thereof
CN112093988A (en) * 2020-09-17 2020-12-18 常州大学 Photocatalytic treatment device and method for printing and dyeing wastewater

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1265378A (en) * 1999-10-29 2000-09-06 中山联合鸿兴造纸有限公司 Paper-making waste water treating agent and treating process
CN1654497A (en) * 2005-01-14 2005-08-17 华南理工大学 Chitosan graft ternary polymerization polymeric flocculant and its preparation method and use
EP2407419A1 (en) * 2010-07-16 2012-01-18 Universiteit Twente Photocatalytic water splitting
CN102357360A (en) * 2011-09-07 2012-02-22 南昌航空大学 Catalyst for degrading rhodamine B by photocatalysis, and preparation method thereof
CN103657634A (en) * 2013-12-31 2014-03-26 长沙理工大学 Preparation method of visible light catalysis material for graphene/bismuth molybdate nanobelt
WO2016040875A1 (en) * 2014-09-12 2016-03-17 Nitto Denko Corporation Multivalence semiconductor photocatalytic materials
JP6073520B1 (en) * 2015-07-31 2017-02-01 Toto株式会社 Photocatalyst material and method for producing the same
CN105174396A (en) * 2015-09-02 2015-12-23 铜陵梧桐树农业发展有限公司 Flocculant
CN106925258A (en) * 2015-12-30 2017-07-07 中国科学院上海硅酸盐研究所 A kind of new Mo-Ti monocrystalline oxides nano material and its preparation and application
CN106268768A (en) * 2016-08-04 2017-01-04 苏州德捷膜材料科技有限公司 A kind of preparation with visible light-responded antimony yttrium molybdate nano-photocatalyst and light degradation application
US20190247832A1 (en) * 2017-05-27 2019-08-15 Beifang Minzu University MEHTOD FOR HYDROTHERMAL SYNTHESIS OF THREE DIMENSIONAL Bi4MoO9/TiO2 NANOSTRUCTURE HETEROJUNCTION
CN108940261A (en) * 2018-06-22 2018-12-07 江苏大学 A kind of Preparation method and use for integrating homojunction and heterojunction composite photocatalyst
CN108786786A (en) * 2018-07-17 2018-11-13 河南科技大学 A kind of photocatalytic degradation nanometer MoO3The preparation method of powder
CN110038616A (en) * 2019-04-23 2019-07-23 襄阳先创环保科技有限公司 A kind of municipal sewage treatment agent
CN111215119A (en) * 2020-03-05 2020-06-02 浙江大学 Preparation method of surface dispersion type nano bismuth molybdate composite photocatalytic material
CN111362386A (en) * 2020-03-26 2020-07-03 宋庆红 Environment-friendly sewage treatment flocculant and preparation method thereof
CN112093988A (en) * 2020-09-17 2020-12-18 常州大学 Photocatalytic treatment device and method for printing and dyeing wastewater

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
SHI NEE LOU ET AL.: "Photoelectrochemical water oxidation using a Bi2MoO6/MoO3 heterojunction photoanode synthesised by hydrothermal treatment of an anodised MoO3 thin film", 《JOURNAL OF MATERIALS CHEMISTRY A》 *
李凤生等: "《微纳米粉体后处理技术及应用》", 30 September 2005 *
罗善霞: "Bi2WO6和掺杂与负载型TiO2光催化剂的制备与表征及其活性评价", 《中国博士学位论文全文数据库 工程科技1辑》 *

Similar Documents

Publication Publication Date Title
CN106045257B (en) Bed mud combined treatment process
CN101591085A (en) A kind of wastewater treatment and reuse technology for paper mill
CN105217869B (en) The method of resource of spent acid a kind of generated in flue gas during smelting Sulphuric acid
CN105906133B (en) A kind of water body purification method and device of strong magnetic separation-magnetic green substance charcoal absorption
CN105107522A (en) Ferro-manganese composite oxide catalyst and preparation method thereof
CN101182079B (en) Citric acid mother liquor treatment process
CN103043789A (en) Anaerobic reactor and treatment method of cotton pulp production waste water
CN110182995A (en) Advanced treatment method for carbonization wastewater
CN101781031B (en) Purification treatment method of reclaimed papermaking water
CN101215031A (en) Method for preparing clay composite flocculant
CN108640131A (en) Lithium ore prepares the method and system of lithium carbonate
CN108178228A (en) The method that water hyacinth base hydro-thermal carbon adsorbent removes Crystal Violet Dye in water removal
CN112939417A (en) Activated sludge conditioner for biochemical treatment of wastewater and preparation method thereof
US2858269A (en) Coagulation and sludge conditioning
CN101863545B (en) Decolorizing agent for coked waste water and using method thereof
CN114573150A (en) Papermaking sewage treatment process
CN209113686U (en) A kind of combination unit handling hc effluent with high salt
CN108164035A (en) A kind of recovery processing technique of bubble green pepper pickling brine
CN209537034U (en) A kind of pretreatment system of oily waste water
CN116495947B (en) Wastewater treatment process of wild jujube cleaning water
CN112939178B (en) Environment-friendly sewage treatment agent for papermaking and production process thereof
CN109851088A (en) A kind of processing method of electroplating wastewater
CN219839618U (en) Sludge dewatering treatment system
CN109174064A (en) The preparation of bentonite-moringa seeds albumen composite adsorbing material and its application method
CN113277607B (en) Plant waste-based desulfurization wastewater treatment reagent and preparation process and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20220603