CN115432869A - Advanced treatment method for papermaking wastewater - Google Patents

Advanced treatment method for papermaking wastewater Download PDF

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Publication number
CN115432869A
CN115432869A CN202211191481.XA CN202211191481A CN115432869A CN 115432869 A CN115432869 A CN 115432869A CN 202211191481 A CN202211191481 A CN 202211191481A CN 115432869 A CN115432869 A CN 115432869A
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China
Prior art keywords
wastewater
water
treatment
papermaking
tank
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Pending
Application number
CN202211191481.XA
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Chinese (zh)
Inventor
陈瑞
张正芳
李小龙
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Xiangshui Huaqing Sewage Treatment Co ltd
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Xiangshui Huaqing Sewage Treatment Co ltd
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Priority to CN202211191481.XA priority Critical patent/CN115432869A/en
Publication of CN115432869A publication Critical patent/CN115432869A/en
Pending legal-status Critical Current

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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
    • C02F1/24—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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic 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
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent

Abstract

The invention belongs to the field of surface treatment, in particular to a papermaking wastewater advanced treatment method, aiming at the problem of long treatment time of burrs of the existing copper casting, the following scheme is proposed: the method comprises the following steps: s1: the papermaking wastewater is pre-filtered, and the specific operation method is as follows: pre-filtering the papermaking wastewater; s2: adding a flotation agent into a wastewater treatment tank; s3: scraping the foam layer by using a slag scraper to remove SS and BOD in the wastewater; s4: fe2+ and H2O2 are introduced into the wastewater reaction tank, the H2O2 generates OH with high reaction activity under the catalysis of Fe2+, and the OH can effectively oxidize and degrade organic pollutants in the wastewater; s5: performing secondary precipitation treatment on the wastewater after the degradation treatment, adding a coagulant into the water, and removing fine suspended matters, colloidal substances and chromaticity in the water to enable the effluent to reach the discharge standard; s6: and (4) adsorbing and filtering the effluent again through a fine filter screen, disinfecting, and discharging or recycling through a water outlet pipeline.

Description

Advanced treatment method for papermaking wastewater
Technical Field
The invention relates to the technical field of advanced wastewater treatment, in particular to an advanced treatment method for papermaking wastewater.
Background
The water consumption is large in the paper making production process, about 300-500m < 3 > of water is needed for producing 1 ton of paper, the paper making wastewater contains a large amount of paper making raw materials (about 20 percent of raw materials are lost along with the wastewater), and also contains a large amount of chemicals and other impurities, once the paper making wastewater is discharged randomly without being treated, the water body is greatly damaged, the paper making wastewater can be divided into raw material paper making and waste paper making according to the difference of the paper making raw materials, and the pollutants in the raw material paper making and the waste paper making are different;
the SS and COD of the waste paper papermaking sewage are high, the COD consists of two parts of non-soluble COD and soluble COD, usually the non-soluble COD accounts for most of the total amount of the COD, and when the SS in the sewage is removed, most of the non-soluble COD is removed at the same time, so that the main problem to be solved in the waste paper papermaking sewage treatment is to remove the SS and the COD;
at present, the papermaking wastewater treatment in China generally adopts a primary physicochemical treatment and secondary biochemical treatment process, and COD and chroma values in effluent after secondary treatment are both high. Through the biochemical treatment of anterior segment, remaining in the play water after the secondary treatment is mostly the poisonous harmful substance of difficult biodegradable, discharges into the water, can bring potential harm for the environment. Therefore, after the secondary biochemical treatment, the advanced treatment of the discharged water is necessary, the COD and the chromaticity of the discharged water are further reduced, the environmental hazard is reduced, and the recycling value of the discharged water is improved, so that the research and development of an efficient wastewater treatment method have great significance, and various reliable, economic and effective wastewater treatment methods are actively explored.
Disclosure of Invention
The invention provides a method for deeply treating papermaking wastewater, which solves the problems that the conventional papermaking wastewater treatment method is not thorough in treatment, has poor treatment effect on trace harmful chemical substances such as environmental hormones and the like, and cannot completely mineralize or decompose most organic substances.
In order to achieve the purpose, the invention adopts the following technical scheme:
a papermaking wastewater advanced treatment method comprises the following steps:
s1: the papermaking wastewater is pre-filtered, and the specific operation method is as follows: the papermaking wastewater is introduced into a wastewater treatment tank through a pipeline, and the wastewater is pre-filtered by a wastewater barrier coarse strainer, so that impurities with larger particles in water can be separated;
s2: adding a flotation agent into the wastewater treatment tank, wherein polar groups of the flotation agent can be selectively adsorbed by hydrophilic substance particles, and nonpolar groups face water, so that the surfaces of the hydrophilic substance particles are converted into hydrophobic substances to be adhered to bubbles and float up to the water surface along with the bubbles;
s3: after bubbles serving as carriers adhere to pollutants and float to the water surface to form foams, scraping the foam layer by using a slag scraper to remove SS and BOD in the wastewater;
s4: introducing the wastewater treated by the S3 into a wastewater reaction tank through a pipeline, introducing Fe2+ and H2O2 into the wastewater reaction tank, wherein the H2O2 generates OH with high reaction activity under the catalysis of Fe2+, and the OH can effectively oxidize and degrade organic pollutants in the wastewater;
s5: performing secondary precipitation treatment on the wastewater after the degradation treatment, adding a coagulant into the water to destabilize colloidal particles and fine suspended matters in the wastewater, and removing the fine suspended matters, colloidal substances and chromaticity in the water by the method to ensure that the effluent reaches the discharge standard;
s6: and (4) adsorbing and filtering the effluent treated in the step (S5) again through a fine filter screen, disinfecting, and then discharging or recycling through a water outlet pipeline.
Furthermore, the coarse strainer in S1 is made of stainless steel materials and is installed at the joint of the wastewater pipeline and the wastewater treatment tank through a detachable bolt structure.
Furthermore, the flotation agent in S2 can be animal glue, rosin and other materials, the dosage of the animal glue is 3.5mg/L, the dosage of the rosin, bauxite and formaldehyde is 0.3mg/L respectively, and the dosage of sodium hydroxide is 0.1mg/L.
Furthermore, fe2+ and H2O2 in S4 can be combined by adopting an electro-Fenton method, most of organic wastewater treated by using the electro-Fenton method to generate OH is treated by taking flat iron as an anode, taking a porous carbon electrode as a cathode and introducing oxygen or air into the cathode.
Further, when the Fe2+ and the H2O2 in the S4 are electrified, electrochemical reactions with the same electrochemical equivalent are carried out on the cathode and the anode, and Fe2+ and H2O2 with the same amount of substances are respectively generated in the same time, so that the subsequent chemical reaction for generating the Fenton reagent is realized.
Further, feSO4 and Al2 SO 4) 3 can be used as the coagulant in S5.
Further, the solubility of FeSO4 in S5 in water at 20 ℃ is 39.1g/100g of water, and the solubility of Al2 SO 4) 3 in water at 20 ℃ is 36.4g/100g of water.
Further, sludge generated by precipitation in the S5 can be discharged into a sludge concentration tank, the sludge is dehydrated through a dehydrator, filtrate returns to the treatment tank, and mud cakes are transported out for treatment.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by adding the wastewater reaction tank, H2O2 in the wastewater reaction tank generates OH with high reaction activity under the catalysis of Fe < 2+ >, and the OH can effectively oxidize and degrade organic pollutants in wastewater, so that the removal capability of COD in papermaking wastewater is improved, and macromolecular refractory organic matters can be oxidized into low-toxic or non-toxic micromolecular substances.
2. According to the invention, the front and rear filter screens are arranged, impurities in the papermaking wastewater are isolated through the coarse filter screen, and the treated effluent is filtered again through the fine filter screen, so that the wastewater can be prevented from being blocked by the impurities and entering a treatment system, and the effluent is prevented from carrying precipitated particles.
3. According to the invention, the Fe2+ and the H2O2 are combined by using the electro-Fenton method, electrochemical reactions with the same electrochemical equivalent are carried out on the cathode and the anode when the power is on, and Fe2+ and H2O2 with the same amount of substances are respectively generated in the same time, so that the advantages of high utilization rate of H2O2, low cost, high reaction speed and the like can be realized, and the problems of low resource utilization efficiency and the like are avoided.
In conclusion, the invention utilizes the advanced treatment method of the papermaking wastewater to oxidize the macromolecular refractory organics in the papermaking wastewater into low-toxicity or non-toxic micromolecular substances, can realize the advantages of high utilization rate of H2O2, low cost, high reaction speed and the like, and avoids the problems of low resource utilization efficiency and the like.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The first embodiment is as follows:
a papermaking wastewater advanced treatment method comprises the following steps:
s1: the papermaking wastewater is pre-filtered, and the specific operation method is as follows: the papermaking wastewater is introduced into a wastewater treatment tank through a pipeline, and the wastewater is pre-filtered by a wastewater barrier coarse strainer, so that impurities with larger particles in water can be separated;
s2: adding a flotation agent into the wastewater treatment tank, wherein polar groups of the flotation agent can be selectively adsorbed by hydrophilic substance particles, and nonpolar groups face water, so that the surfaces of the hydrophilic substance particles are converted into hydrophobic substances to be adhered to the air bubbles and float up to the water surface along with the air bubbles;
s3: when bubbles serving as carriers adhere to pollutants and float to the water surface to form foams, scraping the foam layer by using a slag scraper to remove SS and BOD in the wastewater;
s4: introducing the wastewater treated by the S3 into a wastewater reaction tank through a pipeline, introducing Fe2+ and H2O2 into the wastewater reaction tank, wherein the H2O2 generates OH with high reaction activity under the catalysis of Fe2+, and the OH can effectively oxidize and degrade organic pollutants in the wastewater;
s5: performing secondary precipitation treatment on the wastewater after the degradation treatment, adding a coagulant into the water to destabilize colloidal particles and fine suspended matters in the wastewater, and removing the fine suspended matters, colloidal substances and chromaticity in the water by the method to ensure that the effluent reaches the discharge standard;
s6: and (4) adsorbing and filtering the effluent treated in the step (S5) again through a fine filter screen, disinfecting, and then discharging or recycling through a water outlet pipeline.
Preferably, coarse strainer in S1 makes for stainless steel material, through detachable bolt structural mounting in the junction in wastewater piping and wastewater treatment pond, can avoid the coarse strainer the condition that the corrosion damaged to appear, is convenient for dismantle the change to the coarse strainer simultaneously.
Preferably, the flotation agent in S2 can be animal glue, rosin and other materials, the dosage of the animal glue is 3.5mg/L, the dosage of the rosin, bauxite and formaldehyde is 0.3mg/L respectively, and the dosage of sodium hydroxide is 0.1mg/L, so that particles in water can be adsorbed and suspended to the water surface conveniently.
Preferably, the Fe2+ and H2O2 in S4 can be combined by adopting an electro-Fenton method, most of the organic wastewater treated by using the electro-Fenton method to generate OH is treated by taking flat iron as an anode, taking a porous carbon electrode as a cathode and introducing oxygen or air into the cathode, and the organic wastewater treated by using the electro-Fenton method has the advantages of high H2O2 utilization rate, low cost, high reaction speed and the like compared with a common chemical Fenton reagent.
Preferably, when the Fe2+ and the H2O2 in the S4 are electrified, electrochemical reactions with the same electrochemical equivalent are performed on the cathode and the anode, and Fe2+ and H2O2 with the same amount of substance are generated in the same time, so that a chemical reaction for generating the Fenton reagent later is realized, and efficient oxidative degradation of organic pollutants in the wastewater is facilitated.
Preferably, feSO4 is adopted as the coagulant in S5, so that sulfides in the sewage can be precipitated conveniently, the PH can be reduced through hydrolysis, and the protein in the sewage can be precipitated.
Preferably, the solubility of FeSO4 in S5 in water at 20 ℃ is 39.1g/100g of water.
Preferably, the sludge generated by the precipitation in the S5 can be discharged into a sludge concentration tank, the sludge is dewatered by a dewatering machine, the filtrate returns to a treatment tank, and the mud cake is transported outside for treatment, so that the sludge generated by the precipitation can be effectively treated, and secondary pollution is avoided.
The second embodiment:
a method for deeply treating papermaking wastewater comprises the following steps:
s1: the papermaking wastewater is pre-filtered, and the specific operation method is as follows: the papermaking wastewater is introduced into a wastewater treatment tank through a pipeline, and the wastewater is pre-filtered by a wastewater barrier coarse strainer, so that impurities with larger particles in water can be separated;
s2: adding a flotation agent into the wastewater treatment tank, wherein polar groups of the flotation agent can be selectively adsorbed by hydrophilic substance particles, and nonpolar groups face water, so that the surfaces of the hydrophilic substance particles are converted into hydrophobic substances to be adhered to bubbles and float up to the water surface along with the bubbles;
s3: after bubbles serving as carriers adhere to pollutants and float to the water surface to form foams, scraping the foam layer by using a slag scraper to remove SS and BOD in the wastewater;
s4: introducing the wastewater treated by the S3 into a wastewater reaction tank through a pipeline, introducing Fe2+ and H2O2 into the wastewater reaction tank, wherein the H2O2 generates OH with high reaction activity under the catalysis of Fe2+, and the OH can effectively oxidize and degrade organic pollutants in the wastewater;
s5: performing secondary precipitation treatment on the wastewater after the degradation treatment, adding a coagulant into the water to destabilize colloidal particles and fine suspended matters, and removing the fine suspended matters, colloidal substances and chromaticity in the water by the method to ensure that the effluent reaches the discharge standard;
s6: and (4) adsorbing and filtering the effluent treated in the step (S5) again through a fine filter screen, disinfecting, and then discharging or recycling through a water outlet pipeline.
The preferred, coarse strainer in S1 is made for stainless steel material, through detachable bolt structural installation in the junction in waste water pipeline and waste water treatment pond, can avoid the coarse strainer the condition that the corrosion damaged to appear, is convenient for dismantle the change to the coarse strainer simultaneously.
Preferably, the flotation agent in S2 can be animal glue, rosin and other materials, the dosage of the animal glue is 3.5mg/L, the dosage of the rosin, bauxite and formaldehyde is 0.3mg/L respectively, and the dosage of sodium hydroxide is 0.1mg/L, so that particles in water can be adsorbed and suspended to the water surface conveniently.
Preferably, the Fe2+ and H2O2 in the S4 can be combined by adopting an electric Fenton method, most of the organic wastewater generated by OH treatment by adopting the electric Fenton method takes flat iron as an anode, a porous carbon electrode as a cathode, and oxygen or air is introduced into the cathode, so that the method has the advantages of high H2O2 utilization rate, low cost, high reaction speed and the like compared with a common chemical Fenton reagent.
Preferably, when the Fe2+ and the H2O2 in the S4 are energized, electrochemical reactions with the same electrochemical equivalent are performed on the cathode and the anode, and Fe2+ and H2O2 with the same amount of substance are generated in the same time, so that a chemical reaction for generating the Fenton reagent later is realized, and efficient oxidative degradation of organic pollutants in the wastewater is facilitated.
Preferably, the coagulant in S5 is Al2 SO 4) 3, SO that sulfides in the sewage can be conveniently precipitated, the PH can be reduced through hydrolysis, and the protein in the sewage can be precipitated.
Preferably, the solubility of Al2 SO 4) 3 in S5 in water at 20 ℃ is 36.4g/100g of water.
Preferably, the sludge generated by the precipitation in the S5 can be discharged into a sludge concentration tank, the sludge is dehydrated through a dehydrator, the filtrate returns to a treatment tank, and the mud cake is transported outside for treatment, so that the sludge generated by the precipitation can be effectively treated, and secondary pollution is avoided.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. The advanced treatment method of the papermaking wastewater is characterized by comprising the following steps:
s1: the papermaking wastewater is pre-filtered, and the specific operation method is as follows: the papermaking wastewater is introduced into a wastewater treatment tank through a pipeline, and the wastewater is pre-filtered by a wastewater barrier coarse strainer, so that impurities with larger particles in the water can be separated;
s2: adding a flotation agent into the wastewater treatment tank, wherein polar groups of the flotation agent can be selectively adsorbed by hydrophilic substance particles, and nonpolar groups face water, so that the surfaces of the hydrophilic substance particles are converted into hydrophobic substances to be adhered to bubbles and float up to the water surface along with the bubbles;
s3: when bubbles serving as carriers adhere to pollutants and float to the water surface to form foams, scraping the foam layer by using a slag scraper to remove SS and BOD in the wastewater;
s4: introducing the wastewater treated by the S3 into a wastewater reaction tank through a pipeline, introducing Fe2+ and H2O2 into the wastewater reaction tank, wherein the H2O2 generates OH with high reaction activity under the catalysis of Fe2+, and the OH can effectively oxidize and degrade organic pollutants in the wastewater;
s5: performing secondary precipitation treatment on the wastewater after the degradation treatment, adding a coagulant into the water to destabilize colloidal particles and fine suspended matters in the wastewater, and removing the fine suspended matters, colloidal substances and chromaticity in the water by the method to ensure that the effluent reaches the discharge standard;
s6: and (4) adsorbing and filtering the effluent treated in the step (S5) again through a fine filter screen, disinfecting, and then discharging or recycling through a water outlet pipeline.
2. The method as claimed in claim 1, wherein the coarse screen in S1 is made of stainless steel and is installed at the connection of the waste water pipeline and the waste water treatment tank by a detachable bolt structure.
3. The method for deeply treating papermaking wastewater according to claim 1, wherein the flotation agent in S2 can be selected from the group consisting of gelatin, rosin, and the like, the dosage of gelatin is 3.5mg/L, the dosage of rosin, bauxite, and formaldehyde is 0.3mg/L, and the dosage of sodium hydroxide is 0.1mg/L.
4. The method as claimed in claim 1, wherein the Fe2+ and H2O2 in S4 can be combined by an electro-Fenton method, and most of the organic wastewater generated by the electro-Fenton method and treated by OH is treated by using flat iron as an anode, a porous carbon electrode as a cathode, and oxygen or air as a cathode.
5. The method as claimed in claim 4, wherein when Fe2+ and H2O2 in S4 are electrified, electrochemical reactions with the same electrochemical equivalent are carried out on the cathode and the anode, and Fe2+ and H2O2 with the same amount of substance are generated in the same time, so that the subsequent chemical reaction for generating Fenton reagent is realized.
6. The method for deeply treating the papermaking wastewater according to claim 1, wherein FeSO4 and Al2 SO 4) 3 can be adopted as the coagulant in S5.
7. The method as claimed in claim 6, wherein the solubility of FeSO4 in S5 in water at 20 ℃ is 39.1g/100g water, and the solubility of Al2 SO 4) 3 in water at 20 ℃ is 36.4g/100g water.
8. The method for the advanced treatment of papermaking wastewater according to claim 1, wherein the sludge generated by the precipitation in S5 can be discharged into a sludge concentration tank, the sludge is dewatered by a dewatering machine, the filtrate is returned to the treatment tank, and the sludge cake is transported to an outside for treatment.
CN202211191481.XA 2022-09-28 2022-09-28 Advanced treatment method for papermaking wastewater Pending CN115432869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211191481.XA CN115432869A (en) 2022-09-28 2022-09-28 Advanced treatment method for papermaking wastewater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211191481.XA CN115432869A (en) 2022-09-28 2022-09-28 Advanced treatment method for papermaking wastewater

Publications (1)

Publication Number Publication Date
CN115432869A true CN115432869A (en) 2022-12-06

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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