CN112707585B - Recycling process of hydroxypropyl methyl cellulose production wastewater - Google Patents

Recycling process of hydroxypropyl methyl cellulose production wastewater Download PDF

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CN112707585B
CN112707585B CN202011413814.XA CN202011413814A CN112707585B CN 112707585 B CN112707585 B CN 112707585B CN 202011413814 A CN202011413814 A CN 202011413814A CN 112707585 B CN112707585 B CN 112707585B
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wastewater
hydroxypropyl methyl
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treatment
methyl cellulose
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CN112707585A (en
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王绪林
王绪国
王先兰
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Anhui Senmiao Industry 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • 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
    • C02F1/66—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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • 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
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    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

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Abstract

The invention provides a recycling process of hydroxypropyl methyl cellulose production wastewater, which comprises the following steps: s1, taking zwitterionic polyacrylamide, poly-4-methyl-1-pentene and polydimethylsiloxane, reacting, and adding a composite fiber material, shell powder and dimercaptopropanol to obtain a filtering prediction material; s2, soaking the filter material in an alkaline solution, and adding 11-mercapto-1-undecanol and Tween 60 to obtain a filter material; s3, adjusting the pH value of the wastewater in an acid-base adjusting tank; s4, carrying out primary sedimentation treatment; s5, filtering by using a filter material; s6, anaerobic treatment; s7, biochemical treatment; s8, carrying out secondary sedimentation treatment; and S9, after being treated by a sand filter, the recycling process of the hydroxypropyl methyl cellulose production wastewater is completed. The waste water recycling process provided by the invention can obviously reduce the COD value, has high comprehensive utilization rate, low salt content before biochemical treatment and good biochemical performance.

Description

Recycling process of hydroxypropyl methyl cellulose production wastewater
Technical Field
The invention relates to the technical field of fine chemical production, in particular to a recycling process of hydroxypropyl methyl cellulose production wastewater.
Background
Hydroxypropyl methylcellulose, also known as hypromellose, is one of the non-ionic cellulose mixed ethers. The high-performance oil-resistant modified starch is often used as a thickening agent, a dispersing agent, an adhesive, an excipient, an oil-resistant coating, a filler, an emulsifier, a stabilizer and the like in the field of textile industry, is widely applied to the fields of synthetic resin, petrochemical industry, ceramics, papermaking, leather, medicine, food, cosmetics and the like, and has large demand in actual production. According to statistics, 30-50 tons of wastewater can be generated when each 1 ton of hydroxypropyl methylcellulose is produced, so the requirement on the wastewater treatment efficiency is increased along with the increase of the demand of hydroxypropyl methylcellulose products. The main problems of the waste water after the hydroxypropyl methyl cellulose is produced at present are as follows: firstly, the waste water contains solvent which is not recycled completely; secondly, the COD content in the wastewater is higher, and generally ranges from 4000 mg/L to 10000 mg/L; thirdly, the salt content is high, the sodium chloride content is generally 4% -7%, the biochemical treatment is not facilitated, and the sodium chloride needs to be diluted to be below 2% before the biochemical treatment, so that more waste water is generated. Based on the defects of the prior art, the invention provides a process for recycling production wastewater of hydroxypropyl methyl cellulose.
Disclosure of Invention
The invention aims to solve the defects that the waste water obtained by producing hydroxypropyl methyl cellulose in the prior art contains solvent which is not completely recovered and has high COD and sodium chloride content, and provides a process for recovering and recycling the waste water produced by producing hydroxypropyl methyl cellulose.
A process for recycling production wastewater of hydroxypropyl methyl cellulose comprises the following steps:
s1, preparation of filter prediction: placing zwitterionic polyacrylamide, poly-4-methyl-1-pentene and polydimethylsiloxane into a reactor, mixing at the temperature of 80-85 ℃ and the rotating speed of 40-60 r/min for 5-10 min, then adding a composite fiber material, shell powder and dimercaptopropanol, heating to 90 ℃, continuing mixing for 5-10 min, discharging, and carrying out compression molding to obtain a filter prediction;
s2, expected post-processing: soaking the filter material obtained in the step S1 in 0.5-1 mol/L alkaline solution, adding 11-mercapto-1-undecanol and Tween 60, intermittently shaking at 50-69 ℃ for 2-3 h, taking out, washing with 80 ℃ water for 10min, and drying to obtain a filter material;
s3, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 6.5-7.5, and obtaining pretreated wastewater;
s4, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step into a sedimentation I tank, adding a sedimentation agent accounting for 0.04-0.06% of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 3-5 h, filtering, finishing the first sedimentation of the wastewater, collecting filtered residues, drying the filtered residues, mixing the dried filtered residues with a thoroughly decomposed microbial inoculum to obtain a mixture, spraying brown sugar water accounting for 5% of the mass concentration of the mixture, controlling the water content of the mixture to be 50-60%, and finishing the composting fermentation to obtain a fertilizer;
s5, filtering the wastewater: heating the wastewater treated in the step S4 to 40-45 ℃, and filtering the hot wastewater by the filter material prepared in the step S2 to obtain a filtrate;
s6, anaerobic treatment of wastewater: sending the filtrate obtained in the step S5 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s7, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S6 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s8, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S7 into a sedimentation II tank, adding polyaluminium chloride with the mass of 0.1% of that of the wastewater into the sedimentation II tank, stirring for 30min, standing for 3-5 h, and filtering to finish secondary sedimentation of the wastewater;
s9, post-processing: and treating the wastewater subjected to the secondary sedimentation by a sand filter, and discharging the wastewater from a standardized discharge port after reaching the standard, thereby completing the process for recycling the wastewater generated in the production of the hydroxypropyl methyl cellulose.
Preferably, in step S1, the zwitterionic polyacrylamide, the poly 4-methyl-1-pentene, the polydimethylsiloxane, the composite fiber material, the shell powder and the dimercaprol are sequentially as follows according to the weight percentage: 40-50 parts, 30-40 parts, 3-8 parts, 10-20 parts, 1-5 parts and 3-6 parts.
Preferably, the composite fiber material is prepared by drying the component A and the component B respectively according to the weight ratio of 6-7: 3-4, wherein the component A is alkali-soluble polyester, and the component B is polyethylene.
Preferably, the pressure in the spinning process is 0.6MPa, the spinning and box body temperature is 285 ℃, the spinning speed is 900m/min, the blowing speed is 20m/min, and the stretching multiple is 3.8-4.2.
Preferably, the alkaline solution is an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution.
Preferably, in step S2, the added mass of 11-mercapto-1-undecanol and tween 60 is 0.3% to 0.8% and 0.6% to 1.2% of the alkaline solution, respectively.
Preferably, in step S2, the frequency of the intermittent oscillation is 1min every 20 min.
Preferably, in step S4, the settling agent is prepared from a mixture of a settling agent and a solvent in a mass ratio of 10: 3: 2, ultrasonically dispersing the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate for 1h at 40 ℃ by using a proper amount of absolute ethyl alcohol, and then carrying out reduced pressure concentration and vacuum drying to obtain the modified polyacrylamide.
Preferably, in step S4, the effective viable count of the decomposing inoculant is 1 hundred million/g, wherein the moisture content is 35%, and the strains in the decomposing inoculant include bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis.
Compared with the prior art, the invention has the advantages that:
1. the recycling process provided by the invention has the advantages that the pH value of the wastewater accords with the condition of sedimentation treatment through the acid-base treatment of the wastewater, the sedimentation effect is favorably improved, the salt content in the wastewater is reduced to below 2 percent after the acid-base adjustment of the wastewater and the sedimentation treatment and the filtration treatment of a special prepared filter material, the value of COD is obviously reduced, the value of BOD/COD is obviously improved, the subsequent biochemical treatment is facilitated, the water after the anaerobic treatment, the biochemical treatment, the secondary sedimentation treatment and the sand filter tank treatment can be recycled, the recycling process can be used in the fields of building, agriculture, traffic, energy, petrochemical industry, environmental protection, urban landscape, medical treatment, catering and the like, the recycling purpose is achieved, the utilization rate of resources is improved, and the filtration residue after the primary sedimentation can be mixed with a thoroughly decomposed microbial inoculum to prepare a fertilizer, so that the comprehensive utilization rate of wastes is improved, effectively solves the defects that the waste water obtained by the prior production of hydroxypropyl methyl cellulose contains solvent which is not recycled completely and has high COD and sodium chloride content.
2. The settling agent used in the first settling treatment process is prepared from the following components in a mass ratio of 10: 3: 2, the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate can achieve the effect of rapid sedimentation, and can obviously reduce the content of COD in the wastewater.
3. The filtering material used by the invention is prepared by adopting a special method, the method is provided for the first time by taking the zwitterionic polyacrylamide and the poly-4-methyl-1-pentene as main materials, and the polydimethylsiloxane is added in the mixing process, so that the method can be helpful for mixing the zwitterionic polyacrylamide and the poly-4-methyl-1-pentene, can also be helpful for quickly dispersing the shell powder, and can also be helpful for the subsequent alkaline solution treatment process, so that the obtained filtering material has the porous characteristic and uniform pore distribution, the composite fiber material, the shell powder and the dimercaptopropanol are added in the raw materials of the filtering material, and 11-mercapto-1-undecanol and tween 60 are introduced in the expected post-treatment process, experiments show that the filtering material prepared by the invention has excellent treatment capacity on salt in wastewater, and can increase the BOD/COD value of the wastewater treated by the filter material to 0.53, so that the biodegradability of the wastewater is good.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example 1
The invention provides a recycling process of hydroxypropyl methyl cellulose production wastewater, which comprises the following steps:
s1, preparation of filter prediction: placing zwitterionic polyacrylamide, poly-4-methyl-1-pentene and polydimethylsiloxane into a reactor, mixing for 10min at the temperature of 80 ℃ and the rotating speed of 60r/min, then adding a composite fiber material, shell powder and dimercaprol, heating to 90 ℃, continuing mixing for 10min, discharging, and carrying out compression molding to obtain a filter prediction;
the amphoteric ion polyacrylamide, the poly-4-methyl-1-pentene, the polydimethylsiloxane, the composite fiber material, the shell powder and the dimercaptopropanol are sequentially as follows in parts by weight: 40 parts, 3 parts, 10 parts, 5 parts and 3 parts;
the composite fiber material is prepared by respectively drying the component A and the component B according to the weight ratio of 6: 4, the component A is alkali soluble polyester, and the component B is polyethylene; in the spinning process, the pressure is 0.6MPa, the spinning and box body temperature is 285 ℃, the spinning speed is 900m/min, the blowing speed is 20m/min, and the stretching ratio is 3.8;
s2, expected post-processing: soaking the filter material obtained in the step S1 in 1mol/L sodium hydroxide aqueous solution, adding 11-mercapto-1-undecanol and Tween 60, intermittently shaking at 50 ℃ for 3h at a frequency of 1min every 20min, taking out after the intermittent shaking is finished, washing with 80 ℃ water for 10min, and drying to obtain the filter material; the adding mass of the 11-mercapto-1-undecanol and the Tween 60 is respectively 0.3% and 1.2% of that of the alkaline solution;
s3, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 6.5, and obtaining pretreated wastewater;
s4, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step into a sedimentation I tank, adding a sedimentation agent accounting for 0.04% of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 5h, filtering, finishing the first sedimentation of the wastewater, collecting filtering residues, drying the filtering residues, mixing the filtering residues with a decomposed microbial inoculum to obtain a mixture, spraying brown sugar water accounting for 5% of the mass concentration of the mixture, controlling the water content of the mixture to be 50%, and finishing the composting fermentation to obtain a fertilizer;
the settling agent is prepared from the following components in percentage by mass of 10: 3: 2, ultrasonically dispersing the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate for 1 hour at 40 ℃ by using a proper amount of absolute ethyl alcohol, and then performing reduced pressure concentration and vacuum drying to obtain the modified polyacrylamide;
the effective viable count of the decomposing inoculant is 1 hundred million/g, wherein the moisture content is 35 percent, and strains in the decomposing inoculant comprise bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis;
s5, filtering the wastewater: heating the wastewater treated in the step S4 to 45 ℃, and filtering the hot wastewater by the filter material prepared in the step S2 to obtain a filtrate;
s6, anaerobic treatment of wastewater: sending the filtrate obtained in the step S5 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s7, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S6 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s8, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S7 into a sedimentation II tank, adding polyaluminium chloride with the mass of 0.1% of that of the wastewater into the sedimentation II tank, stirring for 30min, standing for 3h, and filtering to finish the secondary sedimentation of the wastewater;
s9, post-processing: and (4) treating the wastewater subjected to the secondary sedimentation by using a sand filter, thus completing the recycling process of the wastewater generated in the production of the hydroxypropyl methyl cellulose.
Example 2
The invention provides a recycling process of hydroxypropyl methyl cellulose production wastewater, which comprises the following steps:
s1, preparation of filter prediction: placing zwitterionic polyacrylamide, poly-4-methyl-1-pentene and polydimethylsiloxane into a reactor, mixing for 5min at the temperature of 85 ℃ and the rotating speed of 50r/min, then adding a composite fiber material, shell powder and dimercaprol, heating to 90 ℃, continuing mixing for 10min, discharging, and carrying out compression molding to obtain a filter prediction;
the amphoteric ion polyacrylamide, the poly-4-methyl-1-pentene, the polydimethylsiloxane, the composite fiber material, the shell powder and the dimercaptopropanol are sequentially as follows in parts by weight: 45 parts, 40 parts, 5 parts, 15 parts, 3 parts and 5 parts;
the composite fiber material is prepared by respectively drying the component A and the component B according to the weight ratio of 7: 3, the component A is alkali soluble polyester, and the component B is polyethylene; in the spinning process, the pressure is 0.6MPa, the spinning and box body temperature is 285 ℃, the spinning speed is 900m/min, the blowing speed is 20m/min, and the stretching ratio is 4;
s2, expected post-processing: soaking the filter material obtained in the step S1 in 1mol/L sodium hydroxide aqueous solution, adding 11-mercapto-1-undecanol and Tween 60, intermittently shaking at 60 ℃ for 2.5h at a frequency of 1min every 20min, taking out after the intermittent shaking is finished, washing with 80 ℃ water for 10min, and drying to obtain the filter material; the adding mass of the 11-mercapto-1-undecanol and the Tween 60 is respectively 0.5% and 0.9% of that of the alkaline solution;
s3, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 7, and obtaining pretreated wastewater;
s4, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step into a sedimentation I tank, adding a sedimentation agent accounting for 0.05% of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 4h, filtering, finishing the first sedimentation of the wastewater, collecting filtering residues, drying the filtering residues, mixing the filtering residues with a decomposed microbial inoculum to obtain a mixture, spraying brown sugar water with the mass concentration of 5% onto the mixture, controlling the water content of the mixture to be 55%, and finishing the composting fermentation to obtain a fertilizer;
the settling agent is prepared from the following components in percentage by mass of 10: 3: 2, ultrasonically dispersing the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate for 1 hour at 40 ℃ by using a proper amount of absolute ethyl alcohol, and then performing reduced pressure concentration and vacuum drying to obtain the modified polyacrylamide;
the effective viable count of the decomposing microbial inoculum is 1 hundred million/g, wherein the moisture content is 35 percent, and the strains in the decomposing microbial inoculum comprise bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis;
s5, filtering the wastewater: heating the wastewater treated in the step S4 to 45 ℃, and filtering the hot wastewater by the filter material prepared in the step S2 to obtain a filtrate;
s6, anaerobic treatment of wastewater: sending the filtrate obtained in the step S5 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s7, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S6 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s8, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S7 into a sedimentation II tank, adding polyaluminium chloride with the mass of 0.1% of that of the wastewater into the sedimentation II tank, stirring for 30min, standing for 4h, and filtering to finish the secondary sedimentation of the wastewater;
s9, post-processing: and (4) treating the wastewater subjected to the secondary sedimentation by using a sand filter, thus completing the recycling process of the wastewater generated in the production of the hydroxypropyl methyl cellulose.
Example 3
The invention provides a recycling process of hydroxypropyl methyl cellulose production wastewater, which comprises the following steps:
s1, preparation of filter prediction: placing zwitterionic polyacrylamide, poly (4-methyl-1-pentene) and polydimethylsiloxane into a reactor, mixing for 5min at the temperature of 85 ℃ and the rotating speed of 40r/min, adding the composite fiber material, the shell powder and the dimercaptopropanol, heating to 90 ℃, continuing mixing for 5min, discharging, and carrying out compression molding to obtain a filtering expected material;
the amphoteric ion polyacrylamide, the poly-4-methyl-1-pentene, the polydimethylsiloxane, the composite fiber material, the shell powder and the dimercaptopropanol are sequentially as follows in parts by weight: 50 parts, 30 parts, 8 parts, 20 parts, 1 part and 6 parts;
the composite fiber material is prepared by respectively drying the component A and the component B according to the weight ratio of 7: 3, the component A is alkali soluble polyester, and the component B is polyethylene; in the spinning process, the pressure is 0.6MPa, the spinning and box body temperature is 285 ℃, the spinning speed is 900m/min, the blowing speed is 20m/min, and the stretching ratio is 4.2;
s2, expected post-processing: soaking the filter material obtained in the step S1 in 0.5mol/L potassium hydroxide aqueous solution, adding 11-mercapto-1-undecanol and Tween 60, intermittently shaking at 69 ℃ for 2h at a frequency of 1min every 20min, taking out after the intermittent shaking is finished, washing with 80 ℃ water for 10min, and drying to obtain the filter material; the adding mass of the 11-mercapto-1-undecanol and the Tween 60 is respectively 0.8% and 0.6% of that of the alkaline solution;
s3, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 7.5, and obtaining pretreated wastewater;
s4, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step into a sedimentation I tank, adding a sedimentation agent accounting for 0.06% of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 3h, filtering, finishing the first sedimentation of the wastewater, collecting filtering residues, drying the filtering residues, mixing the filtering residues with a decomposed microbial inoculum to obtain a mixture, spraying brown sugar water accounting for 5% of the mass concentration of the mixture, controlling the water content of the mixture to be 60%, and finishing the composting fermentation to obtain a fertilizer;
the settling agent is prepared from the following components in percentage by mass of 10: 3: 2, ultrasonically dispersing the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate for 1 hour at 40 ℃ by using a proper amount of absolute ethyl alcohol, and then performing reduced pressure concentration and vacuum drying to obtain the modified polyacrylamide;
the effective viable count of the decomposing inoculant is 1 hundred million/g, wherein the moisture content is 35 percent, and strains in the decomposing inoculant comprise bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis;
s5, filtering the wastewater: heating the wastewater treated in the step S4 to 40 ℃, and filtering the hot wastewater by the filter material prepared in the step S2 to obtain a filtrate;
s6, anaerobic treatment of wastewater: sending the filtrate obtained in the step S5 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s7, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S6 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s8, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S7 into a sedimentation II tank, adding polyaluminium chloride with the mass of 0.1% of that of the wastewater into the sedimentation II tank, stirring for 30min, standing for 5h, and filtering to finish the secondary sedimentation of the wastewater;
s9, post-processing: and (4) treating the wastewater subjected to the secondary sedimentation by using a sand filter, thus completing the recycling process of the wastewater generated in the production of the hydroxypropyl methyl cellulose.
Comparative example 1
A process for recycling production wastewater of hydroxypropyl methyl cellulose comprises the following steps:
s1, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 7, and obtaining pretreated wastewater;
s2, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step S1 into a sedimentation I tank, adding a sedimentation agent accounting for 0.05 percent of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 4h, filtering, finishing the first sedimentation of the wastewater, collecting filtered residues, drying the filtered residues, mixing the dried filtered residues with a decomposition microbial inoculum to obtain a mixture, spraying brown sugar water with the mass concentration of 5 percent onto the mixture, controlling the water content of the mixture to be 55 percent, and finishing the composting fermentation to obtain a fertilizer;
the settling agent is prepared from the following components in percentage by mass of 10: 3: 2, ultrasonically dispersing the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate for 1 hour at 40 ℃ by using a proper amount of absolute ethyl alcohol, and then performing reduced pressure concentration and vacuum drying to obtain the modified polyacrylamide;
the effective viable count of the decomposing inoculant is 1 hundred million/g, wherein the moisture content is 35 percent, and strains in the decomposing inoculant comprise bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis;
s3, anaerobic treatment of wastewater: delivering the effluent obtained by the first sedimentation of the wastewater in the step S2 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s4, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S3 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s5, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S4 into a sedimentation II tank, adding polyaluminium chloride with the mass of 0.1% of that of the wastewater into the sedimentation II tank, stirring for 30min, standing for 4h, and filtering to finish the secondary sedimentation of the wastewater;
s6, post-processing: and (4) treating the wastewater subjected to the secondary sedimentation by using a sand filter, thus completing the recycling process of the wastewater generated in the production of the hydroxypropyl methyl cellulose.
Comparative example 2
A process for recycling production wastewater of hydroxypropyl methyl cellulose comprises the following steps:
s1, preparation of filter prediction: placing zwitterionic polyacrylamide and poly-4-methyl-1-pentene into a reactor, mixing for 5min at the temperature of 85 ℃ and at the rotating speed of 50r/min, adding a composite fiber material, shell powder and dimercaptopropanol, heating to 90 ℃, continuing mixing for 10min, discharging, carrying out compression molding, and obtaining a filtering expected material;
the amphoteric ion polyacrylamide, the poly-4-methyl-1-pentene, the polydimethylsiloxane, the composite fiber material, the shell powder and the dimercaptopropanol are sequentially as follows in parts by weight: 45 parts, 40 parts, 15 parts, 3 parts and 5 parts;
the composite fiber material is prepared by respectively drying the component A and the component B according to the weight ratio of 7: 3, the component A is alkali soluble polyester, and the component B is polyethylene; in the spinning process, the pressure is 0.6MPa, the spinning and box body temperature is 285 ℃, the spinning speed is 900m/min, the blowing speed is 20m/min, and the stretching ratio is 4;
s2, expected post-processing: soaking the filter material obtained in the step S1 in 1mol/L aqueous solution of sodium hydroxide or potassium hydroxide, adding 11-mercapto-1-undecanol and Tween 60, intermittently shaking at 60 deg.C for 2.5h at a frequency of 1min every 20min, taking out after intermittent shaking, washing with 80 deg.C water for 10min, and oven drying to obtain filter material; the adding mass of the 11-mercapto-1-undecanol and the Tween 60 is respectively 0.5% and 0.9% of that of the alkaline solution;
s3, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 7, and obtaining pretreated wastewater;
s4, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step into a sedimentation I tank, adding a sedimentation agent accounting for 0.05% of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 4h, filtering, finishing the first sedimentation of the wastewater, collecting filtering residues, drying the filtering residues, mixing the filtering residues with a decomposed microbial inoculum to obtain a mixture, spraying brown sugar water with the mass concentration of 5% onto the mixture, controlling the water content of the mixture to be 55%, and finishing the composting fermentation to obtain a fertilizer;
the settling agent is prepared from the following components in percentage by mass of 10: 3: 2, ultrasonically dispersing the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate for 1 hour at 40 ℃ by using a proper amount of absolute ethyl alcohol, and then performing reduced pressure concentration and vacuum drying to obtain the modified polyacrylamide;
the effective viable count of the decomposing inoculant is 1 hundred million/g, wherein the moisture content is 35 percent, and strains in the decomposing inoculant comprise bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis;
s5, filtering the wastewater: heating the wastewater treated in the step S4 to 45 ℃, and filtering the hot wastewater by the filter material prepared in the step S2 to obtain a filtrate;
s6, anaerobic treatment of wastewater: sending the filtrate obtained in the step S5 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s7, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S6 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s8, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S7 into a sedimentation II tank, adding polyaluminium chloride with the mass of 0.1% of that of the wastewater into the sedimentation II tank, stirring for 30min, standing for 4h, and filtering to finish the secondary sedimentation of the wastewater;
s9, post-processing: and (4) treating the wastewater subjected to the secondary sedimentation by using a sand filter, thus completing the recycling process of the wastewater generated in the production of the hydroxypropyl methyl cellulose.
Comparative example 3
A process for recycling production wastewater of hydroxypropyl methyl cellulose comprises the following steps:
s1, preparation of filter prediction: placing zwitterionic polyacrylamide, poly-4-methyl-1-pentene and polydimethylsiloxane into a reactor, mixing for 5min at the temperature of 85 ℃ and the rotating speed of 50r/min, then adding a composite fiber material and shell powder, heating to 90 ℃, continuing mixing for 10min, discharging, and carrying out compression molding to obtain a filter prediction;
the amphoteric ion polyacrylamide, the poly 4-methyl-1-pentene, the polydimethylsiloxane, the composite fiber material and the shell powder are sequentially as follows in parts by weight: 45 parts, 40 parts, 5 parts, 15 parts and 3 parts;
the composite fiber material is prepared by respectively drying the component A and the component B according to the weight ratio of 7: 3, the component A is alkali soluble polyester, and the component B is polyethylene; in the spinning process, the pressure is 0.6MPa, the spinning and box body temperature is 285 ℃, the spinning speed is 900m/min, the blowing speed is 20m/min, and the stretching ratio is 4;
s2, expected post-processing: soaking the filter material obtained in the step S1 in 1mol/L aqueous solution of sodium hydroxide or potassium hydroxide, adding 11-mercapto-1-undecanol and Tween 60, intermittently shaking at 60 deg.C for 2.5h at a frequency of 1min every 20min, taking out after intermittent shaking, washing with 80 deg.C water for 10min, and oven drying to obtain filter material; the adding mass of the 11-mercapto-1-undecanol and the Tween 60 is respectively 0.5% and 0.9% of that of the alkaline solution;
s3, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 7, and obtaining pretreated wastewater;
s4, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step into a sedimentation I tank, adding a sedimentation agent accounting for 0.05% of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 4h, filtering, finishing the first sedimentation of the wastewater, collecting filtering residues, drying the filtering residues, mixing the filtering residues with a decomposed microbial inoculum to obtain a mixture, spraying brown sugar water with the mass concentration of 5% onto the mixture, controlling the water content of the mixture to be 55%, and finishing the composting fermentation to obtain a fertilizer;
the settling agent is prepared from the following components in percentage by mass of 10: 3: 2, ultrasonically dispersing the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate for 1 hour at 40 ℃ by using a proper amount of absolute ethyl alcohol, and then performing reduced pressure concentration and vacuum drying to obtain the modified polyacrylamide;
the effective viable count of the decomposing inoculant is 1 hundred million/g, wherein the moisture content is 35 percent, and strains in the decomposing inoculant comprise bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis;
s5, filtering the wastewater: heating the wastewater treated in the step S4 to 45 ℃, and filtering the hot wastewater by the filter material prepared in the step S2 to obtain a filtrate;
s6, anaerobic treatment of wastewater: sending the filtrate obtained in the step S5 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s7, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S6 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s8, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S7 into a sedimentation II tank, adding polyaluminium chloride with the mass of 0.1% of that of the wastewater into the sedimentation II tank, stirring for 30min, standing for 4h, and filtering to finish the secondary sedimentation of the wastewater;
s9, post-processing: and (4) treating the wastewater subjected to the secondary sedimentation by using a sand filter, thus completing the recycling process of the wastewater generated in the production of the hydroxypropyl methyl cellulose.
Comparative example 4
A process for recycling production wastewater of hydroxypropyl methyl cellulose comprises the following steps:
s1, preparation of filter prediction: placing zwitterionic polyacrylamide, poly-4-methyl-1-pentene and polydimethylsiloxane into a reactor, mixing for 5min at the temperature of 85 ℃ and the rotating speed of 50r/min, then adding a composite fiber material, shell powder and dimercaprol, heating to 90 ℃, continuing mixing for 10min, discharging, and carrying out compression molding to obtain a filter prediction;
the amphoteric ion polyacrylamide, the poly-4-methyl-1-pentene, the polydimethylsiloxane, the composite fiber material, the shell powder and the dimercaptopropanol are sequentially as follows in parts by weight: 45 parts, 40 parts, 5 parts, 15 parts, 3 parts and 5 parts;
the composite fiber material is prepared by respectively drying the component A and the component B according to the weight ratio of 7: 3, the component A is alkali soluble polyester, and the component B is polyethylene; in the spinning process, the pressure is 0.6MPa, the spinning and box body temperature is 285 ℃, the spinning speed is 900m/min, the blowing speed is 20m/min, and the stretching ratio is 4;
s2, expected post-treatment: soaking the filtered material obtained in the step S1 in 1mol/L sodium hydroxide aqueous solution or potassium hydroxide aqueous solution, adding Tween 60, intermittently oscillating at 60 ℃ for 2.5h at the frequency of 1min every 20min, taking out after the intermittent oscillation is finished, washing with water at 80 ℃ for 10min, and drying to obtain the filter material; the adding mass of the Tween 60 is 0.9 percent of that of the alkaline solution;
s3, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 7, and obtaining pretreated wastewater;
s4, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step into a sedimentation I tank, adding a sedimentation agent accounting for 0.05% of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 4h, filtering, finishing the first sedimentation of the wastewater, collecting filtering residues, drying the filtering residues, mixing the filtering residues with a decomposed microbial inoculum to obtain a mixture, spraying brown sugar water with the mass concentration of 5% onto the mixture, controlling the water content of the mixture to be 55%, and finishing the composting fermentation to obtain a fertilizer;
the settling agent is prepared from the following components in percentage by mass of 10: 3: 2, ultrasonically dispersing the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate for 1 hour at 40 ℃ by using a proper amount of absolute ethyl alcohol, and then performing reduced pressure concentration and vacuum drying to obtain the modified polyacrylamide;
the effective viable count of the decomposing inoculant is 1 hundred million/g, wherein the moisture content is 35 percent, and strains in the decomposing inoculant comprise bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis;
s5, filtering the wastewater: heating the wastewater treated in the step S4 to 45 ℃, and filtering the hot wastewater by the filter material prepared in the step S2 to obtain a filtrate;
s6, anaerobic treatment of wastewater: sending the filtrate obtained in the step S5 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s7, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S6 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s8, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S7 into a sedimentation II pool, adding polyaluminum chloride with the mass of 0.1 percent of the mass of the wastewater into the sedimentation II pool, stirring for 30min, standing for 4h, and filtering to finish the secondary sedimentation of the wastewater;
s9, post-processing: and (4) treating the wastewater subjected to the secondary sedimentation by using a sand filter, thus completing the process for recycling the wastewater generated in the hydroxypropyl methyl cellulose production.
Comparative example 5
A process for recycling production wastewater of hydroxypropyl methyl cellulose comprises the following steps:
s1, preparation of filter prediction: placing zwitterionic polyacrylamide, poly-4-methyl-1-pentene and polydimethylsiloxane into a reactor, mixing for 5min at the temperature of 85 ℃ and the rotating speed of 50r/min, then adding a composite fiber material, shell powder and dimercaprol, heating to 90 ℃, continuing mixing for 10min, discharging, and carrying out compression molding to obtain a filter prediction;
the amphoteric ion polyacrylamide, the poly-4-methyl-1-pentene, the polydimethylsiloxane, the composite fiber material, the shell powder and the dimercaptopropanol are sequentially as follows in parts by weight: 45 parts, 40 parts, 5 parts, 15 parts, 3 parts and 5 parts;
the composite fiber material is prepared by respectively drying the component A and the component B according to the weight ratio of 7: 3, the component A is alkali soluble polyester, and the component B is polyethylene; in the spinning process, the pressure is 0.6MPa, the spinning and box body temperature is 285 ℃, the spinning speed is 900m/min, the blowing speed is 20m/min, and the stretching ratio is 4;
s2, expected post-processing: soaking the filter material obtained in the step S1 in 1mol/L aqueous solution of sodium hydroxide or potassium hydroxide, adding 11-mercapto-1-undecanol and Tween 60, intermittently shaking at 60 deg.C for 2.5h at a frequency of 1min every 20min, taking out after intermittent shaking, washing with 80 deg.C water for 10min, and oven drying to obtain filter material; the adding mass of the 11-mercapto-1-undecanol and the Tween 60 is 0.5% and 0.9% of the alkaline solution respectively;
s3, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 7, and obtaining pretreated wastewater;
s4, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step into a sedimentation I tank, adding a sedimentation agent accounting for 0.05% of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 4h, filtering, finishing the first sedimentation of the wastewater, collecting filtering residues, drying the filtering residues, mixing the filtering residues with a decomposed microbial inoculum to obtain a mixture, spraying brown sugar water with the mass concentration of 5% onto the mixture, controlling the water content of the mixture to be 55%, and finishing the composting fermentation to obtain a fertilizer;
the settling agent is prepared by performing ultrasonic dispersion on cationic polyacrylamide by using a proper amount of absolute ethyl alcohol at 40 ℃ for 1 hour, and then performing reduced pressure concentration and vacuum drying;
the effective viable count of the decomposing inoculant is 1 hundred million/g, wherein the moisture content is 35 percent, and strains in the decomposing inoculant comprise bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis;
s5, filtering the wastewater: heating the wastewater treated in the step S4 to 45 ℃, and filtering the hot wastewater by the filter material prepared in the step S2 to obtain a filtrate;
s6, anaerobic treatment of wastewater: sending the filtrate obtained in the step S5 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s7, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S6 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s8, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S7 into a sedimentation II tank, adding polyaluminium chloride with the mass of 0.1% of that of the wastewater into the sedimentation II tank, stirring for 30min, standing for 4h, and filtering to finish the secondary sedimentation of the wastewater;
s9, post-processing: and (4) treating the wastewater subjected to the secondary sedimentation by using a sand filter, thus completing the recycling process of the wastewater generated in the production of the hydroxypropyl methyl cellulose.
The wastewater recycling processes of examples 1 to 3 and comparative examples 1 to 5 were used to treat wastewater in some places (the COD content in the wastewater was 18440mg/L, BOD, 4790mg/L, SS, 85mg/L, and the salt content was 21460mg/L), and the water quality before anaerobic treatment and after the wastewater recycling process are shown in tables 1 and 2, respectively.
TABLE 1 Water quality before anaerobic treatment
Figure BDA0002815350470000211
Figure BDA0002815350470000221
As can be seen from Table 1, the filtering material used in the invention can improve the value of BOD/COD, and can significantly reduce the salt content in wastewater, and the effect is significant, the biodegradability of the water quality before anaerobic treatment in examples 1-3 is excellent, and is significantly better than the biodegradability of the water quality before anaerobic treatment when treated by the treatment processes provided in comparative examples 1-4; as can be seen from Table 1, the effect of the sedimentation agent used in the first sedimentation treatment of the invention on the treatment of COD in wastewater is obviously better than that of the comparative example 5 (only cationic polyacrylamide is used as the sedimentation agent), which shows that the addition of diatomite and propylene glycol monolaurate in the sedimentation agent of the invention can assist the cationic polyacrylamide in reducing the content of COD in wastewater.
TABLE 2 Water quality after wastewater recovery and reuse Process treatment
Figure BDA0002815350470000222
Figure BDA0002815350470000231
The experimental results in Table 2 show that after the wastewater in the places is treated by the wastewater recycling process in the embodiments 1 to 3, the COD value in the wastewater is reduced from 18440mg/L to 54 mg/L to 61mg/L, the BOD value is reduced from 4790mg/L to 17 mg/L to 19mg/L, SS is completely removed, and the treated water quality is good; the experimental results in table 2 also show that the addition of diatomite and propylene glycol monolaurate in the settling agent can also improve the removal effect of SS in wastewater.
Comparing the experimental data in table 1 and table 2, it can be seen that the biochemical performance of the wastewater treated by the settling agent provided by the present invention and filtered by the filter material provided by the present invention (examples 1 to 3) is significantly better than that of comparative examples 1 to 4, and the water quality before anaerobic treatment has an important influence on the subsequent anaerobic treatment and biochemical treatment.
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 (9)

1. A process for recycling production wastewater of hydroxypropyl methyl cellulose is characterized by comprising the following steps:
s1, preparation of filter prediction: placing zwitterionic polyacrylamide, poly-4-methyl-1-pentene and polydimethylsiloxane into a reactor, mixing at the temperature of 80-85 ℃ and the rotating speed of 40-60 r/min for 5-10 min, then adding a composite fiber material, shell powder and dimercaptopropanol, heating to 90 ℃, continuing mixing for 5-10 min, discharging, and carrying out compression molding to obtain a filter prediction;
s2, expected post-processing: soaking the filter material obtained in the step S1 in 0.5-1 mol/L alkaline solution, adding 11-mercapto-1-undecanol and Tween 60, intermittently shaking at 50-69 ℃ for 2-3 h, taking out, washing with 80 ℃ water for 10min, and drying to obtain a filter material;
s3, wastewater pretreatment: taking a water sample of hydroxypropyl methyl fiber production wastewater to detect the pH value, discharging the hydroxypropyl methyl fiber production wastewater into an acid-base adjusting tank, adding a sodium hydroxide aqueous solution or a hydrochloric acid aqueous solution according to the detection result of the pH value until the pH value of the hydroxypropyl methyl fiber production wastewater after acidolysis adjustment is 6.5-7.5, and obtaining pretreated wastewater;
s4, carrying out primary sedimentation treatment on the wastewater: pumping the pretreated wastewater obtained in the step into a sedimentation I tank, adding a sedimentation agent accounting for 0.04-0.06% of the mass of the pretreated wastewater into the sedimentation I tank, stirring for 30min, standing for 3-5 h, filtering to finish the first sedimentation of the wastewater, collecting filtered residues, drying the filtered residues, mixing the dried filtered residues with a decomposed microbial inoculum to obtain a mixture, spraying brown sugar water accounting for 5% of the mass concentration of the mixture, controlling the water content of the mixture to be 50-60%, and performing composting fermentation to obtain a fertilizer;
s5, filtering the wastewater: heating the wastewater treated in the step S4 to 40-45 ℃, and filtering the hot wastewater by the filter material prepared in the step S2 to obtain a filtrate;
s6, anaerobic treatment of wastewater: sending the filtrate obtained in the step S5 and a nutrient source required by anaerobic treatment into an EGSB anaerobic reactor for anaerobic reaction;
s7, biochemical treatment of wastewater: introducing the water flowing out after the treatment in the step S6 to a biological contact oxidation pond, setting the water to be in a secondary level, and carrying out biochemical reaction;
s8, carrying out secondary sedimentation treatment on the wastewater: pumping the water treated in the step S7 into a sedimentation II tank, adding polyaluminium chloride with the mass of 0.1% of that of the wastewater into the sedimentation II tank, stirring for 30min, standing for 3-5 h, and filtering to finish secondary sedimentation of the wastewater;
s9, post-processing: and (4) treating the wastewater subjected to the secondary sedimentation by using a sand filter, thus completing the recycling process of the wastewater generated in the production of the hydroxypropyl methyl cellulose.
2. The hydroxypropyl methyl cellulose production wastewater recycling process according to claim 1, characterized in that the zwitterionic polyacrylamide, poly 4-methyl-1-pentene, polydimethylsiloxane, composite fiber material, shell powder and dimercaprol are sequentially as follows according to weight percentage: 40-50 parts, 30-40 parts, 3-8 parts, 10-20 parts, 1-5 parts and 3-6 parts.
3. The hydroxypropyl methyl cellulose production wastewater recycling process according to claim 1 or 2, characterized in that the composite fiber material is prepared by respectively drying the component A and the component B and then mixing the dried components in a proportion of 6-7: 3-4, wherein the component A is alkali-soluble polyester, and the component B is polyethylene.
4. The hydroxypropyl methyl cellulose production wastewater recycling process according to claim 3, characterized in that in the spinning process, the pressure is 0.6MPa, the spinning and box body temperature is 285 ℃, the spinning speed is 900m/min, the blowing speed is 20m/min, and the drawing multiple is 3.8-4.2.
5. The hydroxypropyl methyl cellulose production wastewater recycling process according to claim 1, characterized in that the alkaline solution is sodium hydroxide aqueous solution or potassium hydroxide aqueous solution.
6. The recycling process of hydroxypropyl methyl cellulose production wastewater according to claim 1, wherein in step S2, the adding mass of 11-mercapto-1-undecanol and tween 60 is 0.3% -0.8% and 0.6% -1.2% of the alkaline solution, respectively.
7. The hydroxypropyl methyl cellulose production wastewater recycling process according to claim 1, wherein in step S2, the intermittent oscillation frequency is 1min oscillation every 20 min.
8. The hydroxypropyl methyl cellulose production wastewater recycling process of claim 1, wherein in step S4, the settling agent is prepared from the following raw materials in a mass ratio of 10: 3: 2, ultrasonically dispersing the cationic polyacrylamide, the diatomite and the propylene glycol monolaurate for 1h at 40 ℃ by using a proper amount of absolute ethyl alcohol, and then carrying out reduced pressure concentration and vacuum drying to obtain the modified polyacrylamide.
9. The hydroxypropyl methyl cellulose production wastewater recycling process of claim 1, wherein in step S4, the number of effective viable bacteria of the decomposing inoculant is 1 hundred million/g, wherein the moisture content is 35%, and the strains in the decomposing inoculant comprise bacillus subtilis, bacillus megaterium, streptomyces microflavus and bacillus licheniformis.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4765915A (en) * 1985-05-23 1988-08-23 The Dow Chemical Company Porous filter media and membrane support means
WO2003046062A1 (en) * 2001-11-21 2003-06-05 Porex Corporation Discrete hydrophilic-hydrophobic porous materials and methods for making the same
CN108033631A (en) * 2017-11-30 2018-05-15 广州漓源环保技术有限公司 One kind contains high salinity sodium carboxymethylcellulose waste water treatment process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4765915A (en) * 1985-05-23 1988-08-23 The Dow Chemical Company Porous filter media and membrane support means
WO2003046062A1 (en) * 2001-11-21 2003-06-05 Porex Corporation Discrete hydrophilic-hydrophobic porous materials and methods for making the same
CN108033631A (en) * 2017-11-30 2018-05-15 广州漓源环保技术有限公司 One kind contains high salinity sodium carboxymethylcellulose waste water treatment process

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