CN114524592A - Flocculation biological treatment method and system for furfural production wastewater - Google Patents

Flocculation biological treatment method and system for furfural production wastewater Download PDF

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CN114524592A
CN114524592A CN202210285640.6A CN202210285640A CN114524592A CN 114524592 A CN114524592 A CN 114524592A CN 202210285640 A CN202210285640 A CN 202210285640A CN 114524592 A CN114524592 A CN 114524592A
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tank
flocculation
wastewater
furfural production
biological treatment
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樊峰鸣
盛谦益
吴永铃
吴烈银
周博
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Beijing Aoke Ruifeng New Energy Co ltd
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Beijing Aoke Ruifeng New Energy Co ltd
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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
    • C02F1/52—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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • 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
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • 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
    • C02F3/02—Aerobic processes
    • 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
    • C02F3/28—Anaerobic digestion processes
    • 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
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The invention provides a flocculation biological treatment method and system for furfural production wastewater. The invention mainly adopts a mode of combining neutralization flocculation with microbial treatment; the acidity of furfural production wastewater is regulated through the neutralization effect of lime slurry, and a flocculating agent is used for enabling part of organic pollutants in the wastewater to form flocculates, so that a good environment is established for microbial treatment, and the flocculation is promoted through air stirring to avoid deposition and blockage; sequentially utilizing anaerobic microorganisms and aerobic microorganisms to further decompose and remove organic matters in the water body; the activity of microorganisms is guaranteed through a microorganism medium circulation mode, and the water treatment capacity is maintained and improved; the layout structure of the flocculation biological treatment system with compact space is constructed.

Description

Flocculation biological treatment method and system for furfural production wastewater
Technical Field
The invention relates to the technical field of water treatment, in particular to a flocculation biological treatment method and system for furfural production wastewater.
Background
Furfural is a widely used basic chemical raw material, and can be used for synthesizing a series of important chemical products such as furfuryl alcohol, furan, furoic acid ethyl ester, succinic acid and the like. At present, furfural cannot be prepared through synthesis, but is prepared through hydrolysis of hemicellulose-containing biomass under the catalytic action of acid. Generally, biomass materials such as corn cobs, corn stover, bagasse and the like are used as raw materials for furfural production.
In the process of producing furfural using the above biomass raw material, wastewater is generated in addition to solid organic residues. According to the calculation, about 15 cubic meters of wastewater can be generated in each ton of furfural product, the wastewater components generated in the furfural production comprise acetic acid, sulfuric acid, pentose, furfural, nitrite, quinoline, butyne chloride, suspended particles and the like, the content of organic pollutants such as COD (chemical oxygen demand), BOD (biochemical oxygen demand) 5 and the like is high, the wastewater has strong acidity, the color is dark brown, and the treatment difficulty is high. Therefore, the treatment of the wastewater is a key link which is not negligible in the production of the furfural. At present, the treatment modes aiming at furfural production wastewater in the prior art mainly comprise an electrodialysis-extraction-rectification method and a biochemical treatment method.
The electrodialysis-extraction-rectification method is to recover acetic acid from waste water by electrodialysis technology and then purify the acetic acid by extraction-rectification, so that double effects of recovering substances and reducing pollution can be achieved. However, the method has the disadvantages of complex process, more influencing factors, unstable yield, higher equipment investment cost, higher energy consumption and low economic benefit in comprehensive view.
The biochemical treatment method is to decompose the organic pollutants in the furfural production wastewater by utilizing the biological metabolism of anaerobic microorganism media, and in comparison, the biochemical treatment method is more economical and effective in removing the organic pollutants, and particularly can adapt to the characteristic of high COD and BOD5 content in the furfural production wastewater. However, the main problems of the prior art include: the strong acidity of the furfural production wastewater causes microorganisms to be difficult to survive or to rapidly die and lose efficacy, so that the removal effect of organic pollutants is influenced, and the raw material cost is increased; the processing system has more links and larger occupied area; suspended matter in wastewater and reaction products in the treatment process are prone to cause sediment blockage.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a flocculation biological treatment method and system for furfural production wastewater.
The flocculation biological treatment method for the furfural production wastewater, provided by the embodiment of the invention, is characterized by sequentially comprising the following steps of:
step 1: carrying out primary treatment of filtering out bulk impurities and settling sand on furfural production wastewater;
step 2: adding lime slurry into the primarily treated wastewater, and adjusting the acidity of the wastewater;
and step 3: reacting the wastewater with a flocculant to form flocs; further settling and removing flocculate in a settling tank;
and 4, step 4: and fully mixing the wastewater after the flocculation treatment with a microbial medium, and then sequentially performing hydrolytic acidification, anaerobic microbial decomposition, aerobic microbial decomposition, precipitation and separation treatment to obtain discharged purified water.
Preferably, in the step 2, lime slurry is first prepared in a lime slurry preparation part; the lime slurry preparation part is divided into a dissolving tank and a stirring tank 2, lime powder is put into the dissolving tank to be dissolved to form lime emulsion with CaO of 8-9.5% by mass, the lime emulsion enters the stirring tank, and the lime emulsion is stirred in the stirring tank through a stirrer to finally form the lime slurry.
Preferably, in the step 2, lime slurry is input into a neutralization tank by a water pump, and the lime slurry and acid components in the furfural production wastewater are subjected to neutralization reaction in the neutralization tank; the pH value of the waste water in the neutralization tank is raised to 5.5-6.5 by adjusting the pumping amount of the lime slurry.
Preferably, in the step 3, the flocculating agent added into the flocculation tank is a mixture of scrap iron, activated carbon and a catalyst.
Preferably, in the step 3, the iron filings and the activated carbon are mixed according to the volume ratio of 1.2:1, and the particle size of the iron filings particles is 1.5-2mm and the particle size of the activated carbon particles is 2-3mm through grinding treatment.
Preferably, in the step 3, air is introduced into the flocculation tank during the reaction process for stirring, so as to create an oxygen-rich environment, and flocculation is promoted by air stirring to avoid deposition and blockage.
Preferably, the step 3 further includes: adding hydrogen peroxide with the concentration of 25-35% into the flocculation tank after the flocculation reaction, wherein the volume ratio of the added hydrogen peroxide to the wastewater is 1: 200.
Preferably, in the step 3, the wastewater after the reaction in the flocculation tank is introduced into a settling tank, flocculates are settled and removed in the settling tank, and a proper amount of NaOH is added to adjust the pH value of the water body to 8.5-9.
Preferably, the flocculation biological treatment method for furfural production wastewater further comprises the following steps: step 5, recycling the microbial medium, extracting the sludge into a stabilization tank, stably degrading organic matters in the sludge, and supplementing a part of the sludge into an aerobic tank to be used as the microbial medium in the aerobic tank; the other part is added with the microorganism through the concentration tank, and then is supplemented into the microorganism mixing tank to culture the microorganism again.
The invention provides a flocculation biological treatment system for realizing the method, which comprises the following steps: the system comprises a grit chamber, a raw water tank, a lime slurry preparation part, a neutralization tank, a flocculation tank, a sedimentation tank, a microorganism mixing tank, a hydrolysis acidification tank, an anaerobic tank, an aerobic tank, a biological filter, a secondary sedimentation tank and a microorganism medium circulation part.
The furfural production wastewater treatment mainly adopts a mode of combining neutralization flocculation with microbial treatment; the acidity of furfural production wastewater is eliminated through the neutralization of lime slurry, part of organic pollutants in the wastewater are flocculated through a flocculating agent, a good environment is established for microbial treatment, and the flocculation is promoted through air stirring to avoid deposition and blockage; sequentially utilizing anaerobic microorganisms and aerobic microorganisms to further decompose and remove organic matters in the water body; the activity of microorganisms is guaranteed through a microorganism medium circulation mode, and the water treatment capacity is maintained and improved; the layout structure of the flocculation biological treatment system with compact space is constructed.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a flocculation biological treatment method for furfural production wastewater according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a flocculation biological treatment system for furfural production wastewater according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The furfural production wastewater treatment mainly adopts a mode of combining neutralization flocculation with microbial treatment; the acidity of furfural production wastewater is regulated through the neutralization effect of lime slurry, and a flocculating agent is used for enabling part of organic pollutants in the wastewater to form flocculates, so that a good environment is established for microbial treatment, and the flocculation is promoted through air stirring to avoid deposition and blockage; sequentially utilizing anaerobic microorganisms and aerobic microorganisms to further decompose and remove organic matters in the water body; the activity of microorganisms is guaranteed through a microorganism medium circulation mode, and the water treatment capacity is maintained and improved; the layout structure of the flocculation biological treatment system with compact space is constructed.
Referring to fig. 1, the invention provides a flocculation biological treatment method of furfural production wastewater. The steps of this example are explained below.
Step 1: carrying out primary treatment of filtering out bulk impurities and settling sand on furfural production wastewater;
step 2: adding lime slurry into the primarily treated wastewater, and adjusting the acidity of the wastewater;
and step 3: reacting the wastewater with a flocculant to form flocs; further settling and removing flocculate in a settling tank;
and 4, step 4: and fully mixing the wastewater after the flocculation treatment with a microbial medium, and then sequentially performing hydrolytic acidification, anaerobic microbial decomposition, aerobic microbial decomposition, precipitation and separation treatment to obtain discharged purified water.
Specifically, in the step 1, furfural production wastewater sequentially flows through multi-stage grids with different grid sizes, floaters and caking impurities in the wastewater are filtered, and then the wastewater enters a grit chamber to precipitate sand in the wastewater, so that the subsequent treatment steps are facilitated; and (3) the wastewater after the primary treatment in the step (1) enters a raw water tank for storage, and is input into a neutralization tank according to the controlled flow, so that the subsequent links are developed, and the adjustment of the subsequent treatment water quantity is realized.
In the step 2, lime slurry is prepared in a lime slurry preparation part; the lime slurry preparation part is divided into a dissolving tank and a stirring tank 2, lime powder is poured into the dissolving tank to be dissolved to form lime emulsion with CaO of 8-9.5% by mass, the lime emulsion enters the stirring tank, the lime emulsion is stirred in the stirring tank through a stirrer to promote full reaction of CaO and water, and Ca (OH) is avoided2Precipitating to finally form lime slurry; further, lime slurry is input into a neutralization tank by a water pump, and the lime slurry and acid components in the furfural production wastewater are subjected to neutralization reaction in the neutralization tank; the pH value of the waste water in the neutralization pond is raised to 5.5-6.5, namely weak acidity by adjusting the pumping amount of the lime slurry. Weak acid performanceThe subsequent flocculation reaction can be promoted, and the pH value can be continuously increased in the subsequent steps, so that the growth of microorganisms can not be influenced.
In step 3, the wastewater in the neutralization pond is introduced into a flocculation pond, and a flocculating agent is added into the flocculation pond. The flocculant is a mixture of scrap iron, activated carbon and a catalyst, the scrap iron and the activated carbon are mixed according to the volume ratio of 1.2:1, the particle size of scrap iron particles is 1.5-2mm through grinding treatment, the particle size of activated carbon particles is 2-3mm, the addition amount of the flocculant is 400 plus 500KG per cubic meter, and the catalyst can be Al2O3、MnO2And CuO, wherein the mass ratio of the catalyst to the flocculant is 2.5: 100-3.5: 100, the reaction time in the flocculation tank is not shorter than 2 hours and not longer than 3 hours, and air is introduced into the flocculation tank during the reaction process for stirring, so that an oxygen-enriched environment is created, and flocs are promoted by the air stirring to avoid deposition and blockage. In the step, under the acidic and oxygen-enriched environment, the scrap iron and the activated carbon quickly generate electrochemical reaction to release ferrous ions and ferric ions Fe2+、Fe3+The furfural intermediate product and organic matter components in the furfural production wastewater are subjected to oxidation-reduction reaction, so that macromolecular organic matter in the furfural production wastewater can be decomposed into micromolecular organic matter; and electrochemically reacting to form Fe ions of divalent and trivalent iron2+、Fe3+The pH value of the water is further increased, and the acidity is reduced; fe ions of divalent and trivalent iron produced by iron filings reaction2+、Fe3+And the hydrate thereof has stronger adsorption flocculation effect, and realizes enrichment and flocculation on electrochemical reaction products, suspended matters in wastewater and the like. As a preferable scheme, hydrogen peroxide with the concentration of 25-35 percent can be added into the flocculation tank after the electrochemical flocculation reaction, the volume ratio of the added hydrogen peroxide to the wastewater is 1:200, and the hydrogen peroxide and ferrous iron ions Fe2+The hydroxyl free radicals with strong oxidizing property are generated together, so that residual organic matters in the wastewater can be oxidized effectively, and the removal rate of COD and BOD5 pollutants in the wastewater from furfural production can be increased. And then, introducing the wastewater after the reaction in the flocculation tank into a settling tank, and settling and removing flocculates in the settling tank. In the deposition tank, a proper amount of NaOH can be added, and water is addedThe pH value of the water body is adjusted to 8.5-9, so that the further sedimentation of ferrous ions, ferric hydroxide colloid and unoxidized organic matters in the water body is promoted. The sedimentation tank can adopt an inclined sedimentation tank, and the sedimentation time of the water body in the sedimentation tank is controlled to be 40 minutes to 1 hour.
In step 4, fully mixing the wastewater after the flocculation treatment with a microbial medium in a microbial mixing pool; and then, sequentially carrying out hydrolysis acidification, an anaerobic tank, an aerobic tank, a biological filter and a secondary sedimentation tank. The microorganism medium in the microorganism mixing pool adopts sludge containing anaerobic active strains, a proper amount of wastewater after flocculation treatment (1/5 which can be filled with water to the capacity of the microorganism mixing pool firstly) is added, nutrition base materials are added for cultivation, the monitoring of the PH value and the COD content of the pool water is kept, after 2-3 days of cultivation, if the COD value is kept to be reduced, the water filling amount is continuously increased (1/5 for increasing the capacity of the mixing pool every day) until the microorganism mixing pool reaches the standard capacity. The mixed water body enters a hydrolytic acidification tank, and hydrolysis of macromolecular organic matters in the sewage is promoted through hydrolytic acidification, so that the biodegradability is improved. Inputting the water body after hydrolytic acidification treatment into an anaerobic tank to carry out anaerobic reaction with anaerobic microorganisms. The effluent of the anaerobic tank enters an aerobic tank to perform contact reaction with aerobic microorganisms in the aerobic tank, and aeration is performed in the period. COD and BOD in the sewage through anaerobic and aerobic microbial reaction5Etc. are further degraded. The effluent of the aerobic tank is communicated with the bottom of the biological filter, and the effluent of the aerobic tank passes through the biological filter and then is precipitated and separated in a secondary sedimentation tank to obtain purified discharge water.
And (5) recycling the microbial medium for the sludge which is rich in the microbial medium and is precipitated and separated in the secondary sedimentation tank, so that the activity of the microbes is guaranteed, and the water treatment capacity is maintained and improved. Specifically, the circulation process of the microbial media sludge is as follows: extracting the sludge in the secondary sedimentation tank to a stabilization tank, stably degrading organic matters in the sludge, and supplementing a part of the sludge to an aerobic tank to be used as a microbial medium in the aerobic tank; the other part is added with the microorganism through the concentration tank, and then is supplemented into the microorganism mixing tank to culture the microorganism again.
Referring to fig. 2, in order to realize the above method, the present invention provides a flocculation biological treatment system for furfural production wastewater, comprising: the system comprises a grit chamber, a raw water tank, a lime slurry preparation part, a neutralization tank, a flocculation tank, a sedimentation tank, a microorganism mixing tank, a hydrolysis acidification tank, an anaerobic tank, an aerobic tank, a biological filter, a secondary sedimentation tank and a microorganism medium circulation part.
Specifically, at an inlet of a grit chamber, furfural production wastewater sequentially flows through multi-stage grids with different grid sizes to filter floating materials and caking impurities in the wastewater, and then enters the grit chamber to precipitate sand in the wastewater, so that subsequent treatment steps are facilitated; the wastewater after primary treatment enters a raw water pool for storage, and is input into a neutralization pool according to the controlled flow, so that the subsequent links are developed, and the adjustment of the subsequent treatment water quantity is realized.
The lime slurry preparation part is used for preparing lime slurry; the lime slurry preparation part is divided into a dissolving tank and a stirring tank 2, lime powder is poured into the dissolving tank to be dissolved to form lime emulsion with CaO of 8-9.5% by mass, the lime emulsion enters the stirring tank, the lime emulsion is stirred in the stirring tank through a stirrer to promote full reaction of CaO and water, and Ca (OH) is avoided2Precipitating to finally form lime slurry; further, lime slurry is input into a neutralization tank by a water pump, and the lime slurry and acid components in the furfural production wastewater are subjected to neutralization reaction in the neutralization tank; the pH value of the waste water in the neutralization pond is raised to 5.5-6.5, namely weak acidity by adjusting the pumping amount of the lime slurry. The weak acidity can promote the subsequent flocculation reaction without affecting the growth of microorganisms.
And introducing the wastewater in the neutralization pond into a flocculation pond, and adding a flocculating agent into the flocculation pond. The flocculant is a mixture of scrap iron, activated carbon and a catalyst, the scrap iron and the activated carbon are mixed according to the volume ratio of 1.2:1, the particle size of scrap iron particles is 1.5-2mm through grinding treatment, the particle size of activated carbon particles is 2-3mm, the addition amount of the flocculant is 400-500KG per cubic meter, and the catalyst can be Al2O3、MnO2Either one of CuO or CuO,the mass ratio of the catalyst to the flocculant is 2.5: 100-3.5: 100, the reaction time in the flocculation tank is not shorter than 2 hours and not longer than 3 hours, and air is introduced into the flocculation tank during the reaction process for stirring, so that an oxygen-enriched environment is created, and flocs are promoted by the air stirring to avoid deposition and blockage. Under the acidic and oxygen-rich environment of the flocculation tank, the scrap iron and the activated carbon quickly generate electrochemical reaction to release bivalent and trivalent iron ions Fe2+、Fe3+The furfural intermediate product and organic matter components in the furfural production wastewater are subjected to oxidation-reduction reaction, so that macromolecular organic matter in the furfural production wastewater can be decomposed into micromolecular organic matter; and electrochemically reacting to form Fe ions of divalent and trivalent iron2+、Fe3+The pH value of the water is further increased, and the acidity is reduced; fe ions of divalent and trivalent iron produced by iron filings reaction2+、Fe3+And the hydrate thereof has stronger adsorption flocculation effect, and realizes enrichment and flocculation on electrochemical reaction products, suspended matters in wastewater and the like. As a preferable scheme, hydrogen peroxide with the concentration of 25-35 percent can be added into the flocculation tank after the electrochemical flocculation reaction, the volume ratio of the hydrogen peroxide to the wastewater is 1:200, and the hydrogen peroxide and ferrous iron ions Fe2+The hydroxyl free radicals with strong oxidizing property are generated together, so that residual organic matters in the wastewater can be oxidized effectively, and the removal rate of COD and BOD5 pollutants in the wastewater from furfural production can be increased. And then, introducing the wastewater after the reaction in the flocculation tank into a settling tank, and settling and removing flocculates in the settling tank. In the sedimentation tank, a proper amount of NaOH can be added to adjust the pH value of the water body to 8.5-9, so that the further sedimentation of ferrous ions, ferric hydroxide colloid and unoxidized organic matters in the water body is promoted. The sedimentation tank can adopt an inclined sedimentation tank, and the sedimentation time of the water body in the sedimentation tank is controlled to be 40 minutes to 1 hour.
The microorganism mixing tank inputs the settled wastewater from the settling tank, and the wastewater after flocculation treatment is fully mixed with a microorganism medium; and then, sequentially carrying out hydrolysis acidification, an anaerobic tank, an aerobic tank, a biological filter and a secondary sedimentation tank. The microorganism medium in the microorganism mixing pool adopts sludge containing anaerobic active bacteria, and proper amount of the sludge is added into the sludge after flocculation treatmentThe wastewater (which can be filled with water to 1/5 times of the capacity of the microorganism mixing tank) is added with nutrient base materials for cultivation, the monitoring of the pH value and the COD content of the tank water is kept, the cultivation is carried out for 2 to 3 days, and if the COD value is kept to be reduced, the water filling amount is continuously increased (1/5 times of the capacity of the mixing tank is increased every day) until the microorganism mixing tank reaches the standard capacity. The mixed water body enters a hydrolysis acidification pool, and the hydrolysis of macromolecular organic matters in the sewage is promoted through hydrolysis acidification, so that the biodegradability is improved. Inputting the water body after hydrolytic acidification treatment into an anaerobic tank to carry out anaerobic reaction with anaerobic microorganisms. The effluent of the anaerobic tank enters an aerobic tank to perform contact reaction with aerobic microorganisms in the aerobic tank, and aeration is performed in the period. COD and BOD in the sewage through anaerobic and aerobic microbial reaction5Etc. are further degraded. The effluent of the aerobic tank passes through the biological filter and then is precipitated and separated in a secondary sedimentation tank to obtain purified water for discharge.
And for the sludge which is deposited and separated in the secondary sedimentation tank and is rich in the microbial media, the microbial media are recycled through the microbial media circulation part, so that the activity of the microbes is guaranteed, and the water treatment capacity is maintained and improved. Specifically, the microorganism medium circulating part comprises a stabilization tank and a sludge conveying pipeline. Wherein, the sludge in the secondary sedimentation tank is extracted to a stabilization tank, organic matters in the sludge are stably degraded, and then a part of the sludge is supplemented to an aerobic tank through the sludge conveying pipeline to be used as a microorganism medium in the aerobic tank; the other part is added with the microorganism through the concentration tank, and then is supplemented into the microorganism mixing tank to culture the microorganism again.
The furfural production wastewater treatment mainly adopts a mode of combining neutralization flocculation with microbial treatment; the acidity of furfural production wastewater is regulated through the neutralization effect of lime slurry, and a flocculating agent is used for enabling part of organic pollutants in the wastewater to form flocculates, so that a good environment is established for microbial treatment, and the flocculation is promoted through air stirring to avoid deposition and blockage; sequentially utilizing anaerobic microorganisms and aerobic microorganisms to further decompose and remove organic matters in the water body; the activity of microorganisms is guaranteed through a microorganism medium circulation mode, and the water treatment capacity is maintained and improved; the layout structure of the flocculation biological treatment system with compact space is constructed.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A flocculation biological treatment method for furfural production wastewater is characterized by sequentially comprising the following steps:
step 1: carrying out primary treatment of filtering out bulk impurities and settling sand on furfural production wastewater;
step 2: adding lime slurry into the primarily treated wastewater, and adjusting the acidity of the wastewater;
and step 3: reacting the wastewater with a flocculant to form flocs; further settling and removing flocculate in a settling tank;
and 4, step 4: and fully mixing the wastewater after the flocculation treatment with a microbial medium, and then sequentially performing hydrolytic acidification, anaerobic microbial decomposition, aerobic microbial decomposition, precipitation and separation treatment to obtain discharged purified water.
2. The flocculation biological treatment method for furfural production wastewater according to claim 1, characterized in that in the step 2, lime slurry is first prepared in a lime slurry preparation part; the lime slurry preparation part is divided into a dissolving tank and a stirring tank 2, lime powder is put into the dissolving tank to be dissolved to form lime emulsion with CaO of 8-9.5% by mass, the lime emulsion enters the stirring tank, and the lime emulsion is stirred in the stirring tank through a stirrer to finally form the lime slurry.
3. The flocculation biological treatment method of furfural production wastewater according to claim 1, wherein in the step 2, lime slurry is input into a neutralization tank by a water pump, and the lime slurry and acidic components in the furfural production wastewater are subjected to neutralization reaction in the neutralization tank; the pH value of the waste water in the neutralization tank is raised to 5.5-6.5 by adjusting the pumping amount of the lime slurry.
4. The flocculation biological treatment method of furfural production wastewater according to claim 1, characterized in that in the step 3, the flocculant added into the flocculation tank is a mixture of scrap iron, activated carbon and a catalyst.
5. The flocculation biological treatment method of furfural production wastewater according to claim 1, characterized in that in the step 3, iron pieces and activated carbon are mixed according to a volume ratio of 1.2:1, and the particle size of the iron pieces particles is 1.5-2mm and the particle size of the activated carbon particles is 2-3mm through grinding treatment.
6. The flocculation biological treatment method of furfural production wastewater according to claim 1, characterized in that in the step 3, air is introduced into the flocculation tank during the reaction for stirring to create an oxygen-rich environment, and flocculation is promoted by air stirring to avoid deposition and blockage.
7. The flocculation biological treatment method for furfural production wastewater according to claim 1, characterized by further comprising, in the step 3: adding hydrogen peroxide with the concentration of 25-35% into the flocculation tank after the flocculation reaction, wherein the volume ratio of the added hydrogen peroxide to the wastewater is 1: 200.
8. The flocculation biological treatment method of furfural production wastewater according to claim 1, characterized in that in the step 3, the wastewater after the reaction in the flocculation tank is introduced into a settling tank, flocculates are settled and removed in the settling tank, and a proper amount of NaOH is added to adjust the pH value of the water body to 8.5-9.
9. The flocculation biological treatment method for wastewater from furfural production according to claim 1, characterized in that the flocculation biological treatment method for wastewater from furfural production further comprises: step 5, recycling the microbial medium, extracting the sludge into a stabilization tank, stably degrading organic matters in the sludge, and supplementing a part of the sludge into an aerobic tank to be used as the microbial medium in the aerobic tank; the other part is added with the microorganism through the concentration tank, and then is supplemented into the microorganism mixing tank to culture the microorganism again.
10. A flocculation biological treatment system for furfural production wastewater, for implementing the method of any one of the preceding claims 1 to 9, characterized by comprising: the system comprises a grit chamber, a raw water tank, a lime slurry preparation part, a neutralization tank, a flocculation tank, a sedimentation tank, a microorganism mixing tank, a hydrolysis acidification tank, an anaerobic tank, an aerobic tank, a biological filter, a secondary sedimentation tank and a microorganism medium circulation part.
CN202210285640.6A 2022-03-23 2022-03-23 Flocculation biological treatment method and system for furfural production wastewater Pending CN114524592A (en)

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