CN111362518A - Separation and recovery method of glue-making wastewater - Google Patents
Separation and recovery method of glue-making wastewater Download PDFInfo
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- CN111362518A CN111362518A CN202010269080.6A CN202010269080A CN111362518A CN 111362518 A CN111362518 A CN 111362518A CN 202010269080 A CN202010269080 A CN 202010269080A CN 111362518 A CN111362518 A CN 111362518A
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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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
- 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
- C02F2103/38—Polymers
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- 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
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention provides a separation and recovery method of glue-making wastewater. The method comprises the following steps: large particles obtained by filtering and separating the glue-making wastewater are used as boiler fuel, and small suspended particles are used for making glue; adjusting the water quality and the water quantity of the filtered glue-making wastewater; performing biological adsorption separation on the regulated glue-making wastewater, fermenting the adsorbed biomass to produce biogas serving as boiler fuel, and utilizing the biogas residues as organic agricultural fertilizer; and (3) carrying out aeration biological filtration deep purification on the glue-making wastewater subjected to biological adsorption separation, and recycling the water discharged from the filter after sterilization and disinfection to complete separation and recovery of the glue-making wastewater. The treatment method can realize resource regeneration and zero discharge of the glue-making wastewater, the pollutants in the wastewater are recycled, and the water quality of the purified water meets the water quality requirement of the glue-making water and can be completely reused for production.
Description
Technical Field
The invention relates to a separation and recovery method of glue-making wastewater, belonging to the technical field of wastewater recovery and treatment.
Background
The rubber-making wastewater is generated in the process of producing raw rubber by primary processing of natural rubber, the water quality is complex, and two typical characteristics are as follows:
1) the wastewater is discharged seasonally and intermittently; the production time of raw rubber is 4-11 months per year, and the raw rubber is produced only in the daytime for about 10 hours, so that the rubber-making waste water is produced only in the time.
2) The concentration of pollutants is high; the main pollutants comprise suspended matters such as leaves, silt, gel and the like, organic matters such as protein, amino acid and the like dissolved in water of natural latex, ammonia water added for preventing the latex from solidifying and formic acid added in the steps of neutralization and solidification in the rubber production.
Only from the view of soluble pollutant components, the glue-making wastewater has no persistent residual pollutant, is easy to degrade and can be utilized by organisms and plants. Therefore, the treatment method of the rubber-making wastewater can be selected from the viewpoint of resource regeneration.
At present, the glue-making wastewater is mainly treated by combining an anaerobic method and an aerobic method, and the main process flow comprises the following steps: a grit chamber, an acidification tank, a multistage oxidation pond, an anaerobic tank, an aerobic tank, a sedimentation tank and the like. But the treatment process has low treatment efficiency, high effluent chromaticity, large occupied area of an oxidation pond and difficult cleaning and fishing of plants in the pond. And the treatment process is focused on the emission up to the standard, basically does not consider resource recovery, only pays attention to social and environmental benefits and does not pay attention to economic benefits.
Disclosure of Invention
The invention aims to provide a method for separating and recovering glue-making wastewater, which realizes resource regeneration and zero discharge of the glue-making wastewater, biogas generated by fermentation can be used as boiler fuel, biogas residues generated by fermentation can be used as agricultural fertilizer, and the water quality of purified water meets the water quality requirement of glue-making water and can enter a reuse water tank for recycling.
In order to achieve the technical purpose, the invention provides a separation and recovery method of glue-making wastewater, which comprises the following steps:
filtering the glue-making wastewater, separating to obtain large particles as boiler fuel and small suspended particles for making glue, so that the COD of the glue-making wastewater is below 7000 mg/L;
adjusting the water quality and the water quantity of the filtered glue-making wastewater, wherein the adjustment retention time is more than 24 hours;
performing biological adsorption separation on the regulated glue-making wastewater, wherein the biological adsorption separation comprises an aerobic adsorption stage and a separation stage; in the aerobic adsorption stage, pollutants such as C, N, P in the wastewater are adsorbed, assimilated and propagated by microorganisms to generate biomass; one part of the biomass obtained in the separation stage flows back to the aerobic adsorption stage, the other part of the biomass is subjected to anaerobic fermentation, and the COD (chemical oxygen demand) of the glue-making wastewater obtained by separation is less than 500mg/L and the ammonia nitrogen is less than 30 mg/L;
converting the biomass subjected to anaerobic fermentation into biogas and biogas residues, and recovering organic carbon in the rubber-making wastewater mainly by using the biogas; nitrogen and phosphorus in the glue-making wastewater are mainly recovered by a biogas residue organic fertilizer;
performing aeration biological filtration on the glue-making wastewater subjected to biological adsorption separation, wherein the glue-making wastewater comprises two stages of aeration biological filters, and the glue-making wastewater is subjected to disinfection and sterilization to obtain purified water so as to complete separation and recovery of the glue-making wastewater; wherein the content of the first and second substances,
the COD of the effluent of the primary biological aerated filter is less than 100mg/L, and the ammonia nitrogen is less than 10 mg/L;
COD of the effluent of the secondary biological aerated filter is less than 50mg/L, ammonia nitrogen is less than 5mg/L, and suspended matters are less than 10 mg/L.
The COD of the glue-making wastewater related by the invention is 7000mg/L-10000mg/L, and the ammonia nitrogen is 130mg/L-400mg/L
The method for separating and recovering the glue-making wastewater comprises the step of filtering. The filtering is mainly to remove large-particle substances such as leaves, sand grains and the like through a screen filter and remove fine suspended particles through a micro-filter. Large particle substances and small suspended particles in the glue making wastewater contain a certain amount of organic substances such as gel with high COD, the COD content of the glue making wastewater is about 8000mg/L, and the COD content can be reduced to below 7000mg/L after filtration and interception. Large granular substances screened by the screening machine can be used as boiler fuel; the fine suspended particles obtained by the micro-filter can be used for preparing glue or boiler fuel.
In one embodiment of the invention, in the filtering stage, the size of the filtering pore for filtering large-particle substances is 1 μm-4mm, and the microfiltration diameter for microfiltration of small suspended particles is 1 μm-5 μm. For example, the pore size of the adopted screen can be 1 μm-4 mm; the diameter of the microfilter used may be between 1 μm and 5 μm.
The separation and recovery method of the glue-making wastewater comprises the step of adjusting the water quality and the water quantity. The conditioning step may be performed in a conditioning tank. The purpose of adjusting the water quality is to ensure that the water quality has small fluctuation, the COD is less than 7000mg/L, and the continuous and stable operation can be carried out subsequently.
The separation and recovery method of the glue-making wastewater comprises the step of biological adsorption separation. The biological adsorption separation comprises two stages, namely an aerobic adsorption stage and a separation stage. Wherein, in the aerobic adsorption stage, pollutants such as C, N, P and the like in the wastewater are adsorbed, assimilated and propagated by microorganisms under aerobic conditions to generate biomass; the separation stage is to separate the biomass from the wastewater, part of the separated biomass flows back to the adsorption stage to supplement microorganisms required by the adsorption reaction, part of the separated biomass is subjected to subsequent fermentation treatment, and the separated wastewater is subjected to aeration biological filtration deep purification.
Wherein, the biomass subjected to fermentation treatment is fermented under anaerobic conditions, the biogas generated by fermentation can be used as boiler fuel, and the biogas residues generated by fermentation are periodically discharged and used as organic agricultural fertilizers.
In the aerobic adsorption stage, the required oxygen is supplied by a blower. In one embodiment of the invention, in the aerobic adsorption stage, the concentration of dissolved oxygen is 2mg/L-5mg/L, and the adsorption reaction time is less than 2 h.
In one embodiment of the invention, the reflux ratio of the biomass in the separation stage is between 50% and 90%.
In a specific embodiment of the invention, the dissolved oxygen concentration of anaerobic fermentation is less than 0.5mg/L, the fermentation time is more than 10 days, and the methane content in the biogas generated by fermentation is 50-80%.
In one embodiment of the invention, the separation stage may be carried out in a microfiltration machine, the pores of which may have a diameter of 1 μm to 5 μm.
In one embodiment of the invention, during the aeration biological filtration, the flora in the filter layer close to the water inlet end is mainly heterotrophic bacteria, and the flora in the filter layer close to the water outlet end is mainly autotrophic nitrifying bacteria.
The separation and recovery method of the glue-making wastewater comprises the step of aeration biological filtration and deep evolution. And the pollutants such as COD, ammonia nitrogen, total nitrogen and the like in the water are gradually reduced by utilizing the two-stage aeration biological filter.
In a specific embodiment of the invention, the dissolved oxygen concentration of the first-stage biological aerated filter is 1mg/L-3mg/L, and the retention time is 2h-6 h.
In a specific embodiment of the invention, the dissolved oxygen concentration of the secondary biological aerated filter is 1mg/L-2mg/L, and the retention time is 1h-4 h.
In a specific embodiment of the invention, the filler of the biological filter of the two-stage aeration filter is volcanic rock, shale ceramsite, zeolite, expanded spherical clay and activated carbon.
In a specific embodiment of the invention, the aeration mode of the two-stage biological aerated filter is blast aeration, mechanical aeration or jet aeration.
The disinfection and sterilization can be carried out in an ozone generator. In a specific embodiment of the invention, the disinfection and sterilization is carried out by adding ozone, wherein the adding amount of ozone is 1g/m3-4g/m3；
Preferably, the disinfection and sterilization time is 5min-30 min.
The invention also provides purified water obtained by treating and recycling the glue-making wastewater by the method. The purified water can be directly used as glue.
The invention also provides a recovery processing device for glue-making wastewater, which comprises:
the screening machine is used for removing large granular substances in the glue-making wastewater;
the micro-filter is used for removing small suspended particles in the glue-making wastewater; after being treated by a screen filter and a micro-filter, the COD of the glue-making wastewater is below 7000 mg/L;
the adjusting unit is used for adjusting the quality and quantity of the filtered glue-making wastewater;
the biological adsorption separation unit comprises an aerobic monkshood adsorption unit and a separation subunit, wherein the COD of the glue-making wastewater obtained by the biological separation subunit is less than 500mg/L, and the ammonia nitrogen is less than 30 mg/L;
the fermentation unit is used for producing methane and a methane residue organic fertilizer;
a two-stage aeration biological filter; and a disinfection device.
The COD of the purified water after the glue-making wastewater is treated by the separation and recovery method of the invention is less than or equal to 50mg/L, BOD5Less than or equal to 10mg/L, ammonia nitrogen less than or equal to 5mg/L, suspended matters less than or equal to 10mg/L, total phosphorus less than or equal to 1mg/L and total bacteria less than or equal to 100/mL, and the water quality meets the water quality requirement of glue making water and can enter a reuse water tank for recycling.
The separation and recovery method of the glue-making wastewater has high resource efficiency, and suspended matters, COD, nitrogen, phosphorus and the like in the wastewater can be effectively recovered to form a self-use raw material, energy and organic fertilizer; after the wastewater is deeply purified, the wastewater is completely recycled for production, zero emission is achieved, economic benefit is good, secondary pollution is avoided, and the clean production level of enterprises is greatly improved.
Drawings
FIG. 1 is a process flow diagram of a method for separating and recovering waste water from gum production in example 1.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1
The embodiment provides a separation and recovery process of glue-making wastewater, the process flow of which is shown in fig. 1, and the process specifically comprises the following steps:
the treatment scale of the separation and recovery process of the glue-making wastewater is designed to be 40m3The water quality index of the glue-making wastewater is pH 5.8, COD content 8200mg/L, BOD5The content is 4950mg/L, the ammonia nitrogen content is 160mg/L, the suspended matter content is 420mg/L, and the total phosphorus content is 90 mg/L.
Firstly, passing the glue-making wastewater through a screening machine with the mesh diameter of 3mm, screening out large-particle substances such as leaves, sand grains and the like in the wastewater, and using the obtained large-particle substances as boiler fuel; then the screened wastewater passes through a micro-filter with the diameter of a micropore of 2 mu m, fine suspended particles in the wastewater are filtered out and used for preparing glue.
And (4) the wastewater after microfiltration enters a homogenizing tank for water quality and quantity adjustment, the adjustment time is 24h, and the adjusted wastewater can also be used as standby water for startup.
The regulated wastewater enters biological adsorption separation, firstly, the dissolved oxygen concentration is kept to be 3-4mg/L by means of an air blower in the adsorption stage, so that pollutants such as C, N, P in the wastewater are adsorbed, assimilated and propagated by microorganisms to generate biomass, and the adsorption reaction time is 1.5 h; after the adsorption reaction is finished, microfiltration is carried out by a microfiltration machine with the diameter of a micropore being 3 mu m in the separation stage, one part of the separated biomass flows back to the adsorption reaction stage with the reflux ratio being 75%, the rest part enters a fermentation tank for fermentation treatment, and the separated wastewater is subjected to aeration biological filtration deep purification.
Fermenting the biomass entering the fermentation tank for 10 days under the anaerobic condition that the concentration of dissolved oxygen is 0mg/L, wherein biogas generated by fermentation is used as boiler fuel, and the content of methane in the biogas is 50-80%; and (3) periodically discharging biogas residues generated by fermentation to be used as organic agricultural fertilizers.
The separated wastewater is subjected to aeration biological filtration deep purification, the biological filter material of the primary aeration biological filter tank is volcanic rock, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 2-3mg/L, and the retention time is 1.5 h; the biological filter material of the second-stage biological aerated filter is biochar, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 1-2mg/L, and the retention time is 1.5 h.
The effluent of the secondary biological aerated filter is disinfected, and the ozone generated by an ozone generator is utilized for sterilization and disinfection, wherein the adding amount of the ozone is 2g/m3-3g/m3And the disinfection time is 8min, and the purified water obtained after the disinfection treatment enters a reuse pool for reuse, so that the whole separation and recovery process flow of the glue-making wastewater is completed.
The final purified water quality indexes are as follows: pH of 7.0, COD content of 30mg/L, BOD5The content is 7mg/L, the ammonia nitrogen content is 0.8mg/L, the suspended matter content is 6mg/L, the total phosphorus content is 0.50mg/L, the total number of bacteria is 75/mL, and the method is odorless and tasteless and meets the water quality requirement of glue-making production water.
Example 2
The treatment scale of the separation and recovery process of the glue-making wastewater is designed to be 40m3The water quality index of the glue-making wastewater is pH 5.5, COD content is 8500mg/L, BOD5The content is 5000mg/L, the ammonia nitrogen content is 180mg/L, the suspended matter content is 450mg/L, and the total phosphorus content is 95 mg/L.
Passing the glue-making wastewater through a screening machine with the mesh diameter of 3mm, screening out large-particle substances such as leaves, sand grains and the like in the wastewater, and using the obtained large-particle substances as boiler fuel; then the screened wastewater passes through a micro-filter with the diameter of a micropore of 2 mu m, fine suspended particles in the wastewater are filtered out and used for preparing glue.
And (4) the wastewater after microfiltration enters a homogenizing tank for water quality and quantity adjustment, the adjustment time is 24h, and the adjusted wastewater can also be used as standby water for startup.
The regulated wastewater enters biological adsorption separation, firstly, the dissolved oxygen concentration is kept to be 4-5mg/L by means of an air blower in the adsorption stage, so that pollutants such as C, N, P in the wastewater are adsorbed, assimilated and propagated by microorganisms to generate biomass, and the adsorption reaction time is 1.5 h; after the adsorption reaction is finished, microfiltration is carried out by a microfiltration machine with the diameter of a micropore being 3 mu m in the separation stage, one part of the separated biomass flows back to the adsorption reaction stage with the reflux ratio of 80 percent, the rest part enters a fermentation tank for fermentation treatment, and the separated wastewater is subjected to aeration biological filtration deep purification.
Fermenting the biomass entering the fermentation tank for 15 days under the anaerobic condition that the concentration of dissolved oxygen is 0.1mg/L, wherein biogas generated by fermentation is used as boiler fuel, and the content of methane in the biogas is 50-80%; and (3) periodically discharging biogas residues generated by fermentation to be used as organic agricultural fertilizers.
The separated wastewater is subjected to aeration biological filtration deep purification, the biological filter material of the primary aeration biological filter tank is volcanic rock, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 2-3mg/L, and the retention time is 3 h; the biological filter material of the secondary biological aerated filter is shale ceramsite, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 1-2mg/L, and the retention time is 2 h.
The effluent of the secondary biological aerated filter is disinfected, and the ozone generated by an ozone generator is utilized for sterilization and disinfection, wherein the adding amount of the ozone is 3g/m3-4g/m3And the disinfection time is 10min, and the purified water obtained after the disinfection treatment enters a recycling pool for recycling, so that the whole separation and recycling process flow of the glue-making wastewater is completed.
The final purified water quality indexes are as follows: pH 7.5, COD content 24mg/L, BOD5The content is 7mg/L, the ammonia nitrogen content is 0.5mg/L, the suspended matter content is 7mg/L, the total phosphorus content is 0.44mg/L, the total number of bacteria is 55/mL, and the method is odorless and tasteless and meets the water quality requirement of glue-making production water.
Comparative example 1
This comparative example provides a separation recovery technology of system glue waste water, specifically includes:
the treatment scale of the separation and recovery process of the glue-making wastewater is designed to be 40m3The water quality index of the glue-making wastewater is pH 5.8, COD content 8200mg/L, BOD5The content is 4950mg/L, the ammonia nitrogen content is 160mg/L, the suspended matter content is 420mg/L, and the total phosphorus content is 90 mg/L.
Passing the glue-making wastewater through a screening machine with the mesh diameter of 3mm, screening out large-particle substances such as leaves, sand grains and the like in the wastewater, and using the obtained large-particle substances as boiler fuel; then the screened wastewater passes through a micro-filter with the diameter of a micropore of 2 mu m, fine suspended particles in the wastewater are filtered out and used for preparing glue.
And (4) the wastewater after microfiltration enters a homogenizing tank for water quality and quantity adjustment, the adjustment time is 12h, and the adjusted wastewater can also be used as standby water for startup.
The regulated wastewater enters biological adsorption separation, firstly, the dissolved oxygen concentration is kept to be 1-2mg/L by means of an air blower in the adsorption stage, so that pollutants such as C, N, P in the wastewater are adsorbed, assimilated and propagated by microorganisms to generate biomass, and the adsorption reaction time is 2.5 hours; after the adsorption reaction is finished, microfiltration is carried out by a microfiltration machine with the diameter of a micropore being 3 mu m in a separation stage, one part of the separated biomass flows back to the adsorption reaction stage with the reflux ratio being 75 percent, the rest part of the separated biomass enters a fermentation tank for fermentation treatment, the separated wastewater is subjected to aeration biological filtration deep purification, the biomass entering the fermentation tank is fermented for 5 days under the anaerobic condition that the dissolved oxygen concentration is 0.5mg/L, the methane generated by fermentation is used as boiler fuel, and the content of methane in the methane is 50 to 80 percent; and (3) periodically discharging biogas residues generated by fermentation to be used as organic agricultural fertilizers.
The separated wastewater is subjected to aeration biological filtration deep purification, the biological filter material of the primary aeration biological filter tank is volcanic rock, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 2-3mg/L, and the retention time is 1.5 h; the biological filter material of the second-stage biological aerated filter is biochar, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 1-2mg/L, and the retention time is 1.5 h.
The effluent of the secondary biological aerated filter is disinfected, and the ozone generated by an ozone generator is utilized for sterilization and disinfection, wherein the adding amount of the ozone is 2g/m3-3g/m3And the disinfection time is 8min, and the purified water obtained after the disinfection treatment enters a recycling pool for recycling, so that the whole recycling treatment process flow of the glue-making wastewater is completed.
The final purified water quality indexes are as follows: pH 7.4, COD content 70mg/L, BOD5The content is 15mg/L, the ammonia nitrogen content is 7.5mg/L, the suspended matter content is 22mg/L, the total phosphorus content is 4.5mg/L, the total number of bacteria is 80/mL, and the method is odorless and tasteless.
Comparative example 2
This comparative example provides a separation recovery technology of system glue waste water, specifically includes:
the treatment scale of the separation and recovery process of the glue-making wastewater is designed to be 40m3The water quality index of the glue-making wastewater is pH 5.8, COD content 8200mg/L, BOD5The content is 4950mg/L, the ammonia nitrogen content is 160mg/L, the suspended matter content is 420mg/L, and the total phosphorus content is 90 mg/L.
Passing the glue-making wastewater through a screening machine with the mesh diameter of 3mm, screening out large-particle substances such as leaves, sand grains and the like in the wastewater, and using the obtained large-particle substances as boiler fuel; then the screened wastewater passes through a micro-filter with the diameter of a micropore of 2 mu m, fine suspended particles in the wastewater are filtered out and used for preparing glue.
And (4) the wastewater after microfiltration enters a homogenizing tank for water quality and quantity adjustment, the adjustment time is 12h, and the adjusted wastewater can also be used as standby water for startup.
The regulated wastewater enters biological adsorption separation, firstly, the dissolved oxygen concentration is kept to be 0-1mg/L by means of an air blower in the adsorption stage, so that pollutants such as C, N, P in the wastewater are adsorbed, assimilated and propagated by microorganisms to generate biomass, and the adsorption reaction time is 2.5 hours; after the adsorption reaction is finished, microfiltration is carried out by a microfiltration machine with the diameter of a micropore being 3 mu m in a separation stage, one part of the separated biomass flows back to the adsorption reaction stage with the reflux ratio being 75 percent, the rest part of the separated biomass enters a fermentation tank for fermentation treatment, the separated wastewater is subjected to aeration biological filtration deep purification, the biomass entering the fermentation tank is fermented for 5 days under the condition that the concentration of dissolved oxygen is 1mg/L, the methane generated by fermentation is used as boiler fuel, and the content of methane in the methane is 50-80 percent; and (3) periodically discharging biogas residues generated by fermentation to be used as organic agricultural fertilizers.
The separated wastewater is subjected to aeration biological filtration deep purification, the biological filter material of the primary aeration biological filter tank is volcanic rock, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 1-2mg/L, and the retention time is 0.5 h; the biological filter material of the second-stage biological aerated filter is biochar, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 0-1mg/L, and the retention time is 0.5 h.
The effluent of the secondary biological aerated filter is disinfected, and the ozone generated by an ozone generator is utilized for sterilization and disinfection, wherein the adding amount of the ozone is 0.5g/m3-1g/m3And the disinfection time is 5min, and the purified water obtained after the disinfection treatment enters a recycling pool for recycling, so that the whole recycling treatment process flow of the glue-making wastewater is completed.
The final purified water quality indexes are as follows: pH of 7.0, COD content of 140mg/L, BOD5The content is 30mg/L, the ammonia nitrogen content is 11.5mg/L, the suspended matter content is 35mg/L, the total phosphorus content is 7.8mg/L, the total number of bacteria is 140/mL, and the method is odorless and tasteless.
Comparative example 3
This comparative example provides a separation recovery technology of system glue waste water, specifically includes:
the treatment scale of the separation and recovery process of the glue-making wastewater is designed to be 40m3The water quality index of the glue-making wastewater is pH 5.8, COD content 8200mg/L, BOD5The content is 4950mg/L, the ammonia nitrogen content is 160mg/L, the suspended matter content is 420mg/L, and the total phosphorus content is 90 mg/L.
Passing the glue-making wastewater through a screening machine with the mesh diameter of 3mm, screening out large-particle substances such as leaves, sand grains and the like in the wastewater, and using the obtained large-particle substances as boiler fuel; then the screened wastewater passes through a micro-filter with the diameter of a micropore of 2 mu m, fine suspended particles in the wastewater are filtered out and used for preparing glue.
And (4) the wastewater after microfiltration enters a homogenizing tank for water quality and quantity adjustment, the adjustment time is 24h, and the adjusted wastewater can also be used as standby water for startup.
The regulated wastewater enters biological adsorption separation, firstly, the dissolved oxygen concentration is kept to be 3-4mg/L by means of an air blower in the adsorption stage, so that pollutants such as C, N, P in the wastewater are adsorbed, assimilated and propagated by microorganisms to generate biomass, and the adsorption reaction time is 1.5 h; after the adsorption reaction is finished, microfiltration is carried out by a microfiltration machine with the diameter of a micropore being 3 mu m in the separation stage, one part of the separated biomass flows back to the adsorption reaction stage with the reflux ratio being 75%, the rest part enters a fermentation tank for fermentation treatment, and the separated wastewater is subjected to aeration biological filtration deep purification.
Fermenting the biomass entering the fermentation tank for 10 days under the anaerobic condition that the concentration of dissolved oxygen is 0.5mg/L, wherein biogas generated by fermentation is used as boiler fuel, and the content of methane in the biogas is 50-80%; and (3) periodically discharging biogas residues generated by fermentation to be used as organic agricultural fertilizers.
The separated wastewater is subjected to aeration biological filtration deep purification, the biological filter material of the primary aeration biological filter tank is volcanic rock, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 0-1mg/L, and the retention time is 0.5 h; the biological filter material of the second-stage biological aerated filter is biochar, the forced aeration mode is blast aeration, the dissolved oxygen concentration is kept at 0.5-1mg/L, and the retention time is 0.5 h.
The effluent of the secondary biological aerated filter is disinfected, and the ozone generated by an ozone generator is utilized for sterilization and disinfection, wherein the adding amount of the ozone is 0.5g/m3-1g/m3And the disinfection time is 5min, and the purified water obtained after the disinfection treatment enters a recycling pool for recycling, so that the whole recycling treatment process flow of the glue-making wastewater is completed.
The final purified water quality indexes are as follows: pH 7.3, COD content 60mg/L, BOD5The content is 12mg/L, the ammonia nitrogen content is 3.6mg/L, the suspended matter content is 18mg/L, the total phosphorus content is 3.2mg/L, the total number of bacteria is 120/mL, and the method is odorless and tasteless.
Claims (10)
1. A separation and recovery method of glue-making wastewater comprises the following steps:
filtering the glue-making wastewater, separating to obtain large particles as boiler fuel and small suspended particles for making glue, so that the COD of the glue-making wastewater is below 7000 mg/L;
adjusting the water quality and the water quantity of the filtered glue-making wastewater, wherein the adjustment retention time is more than 24 hours;
performing biological adsorption separation on the pollutants of the regulated glue-making wastewater, wherein the biological adsorption separation comprises an aerobic adsorption stage and a separation stage; in the aerobic adsorption stage, C, N, P pollutants in the wastewater are adsorbed, assimilated and propagated by using microorganisms to generate biomass; one part of the biomass obtained in the separation stage flows back to the aerobic adsorption stage, the other part of the biomass is subjected to anaerobic fermentation, and the COD (chemical oxygen demand) of the glue-making wastewater obtained by separation is less than 500mg/L and the ammonia nitrogen is less than 30 mg/L;
converting the biomass subjected to anaerobic fermentation into biogas and biogas residues, and recovering organic carbon in the rubber-making wastewater mainly by using the biogas; nitrogen and phosphorus in the glue-making wastewater are mainly recovered by a biogas residue organic fertilizer;
carrying out aeration biological filtration deep purification on the glue-making wastewater subjected to biological adsorption separation, wherein the glue-making wastewater comprises two stages of aeration biological filters, and the effluent of the filters is disinfected and sterilized to obtain purified water so as to complete separation and recovery of the glue-making wastewater; wherein the content of the first and second substances,
the COD of the effluent of the primary biological aerated filter is less than 100mg/L, and the ammonia nitrogen is less than 10 mg/L;
COD of the effluent of the secondary biological aerated filter is less than 50mg/L, ammonia nitrogen is less than 5mg/L, and suspended matters are less than 10 mg/L.
2. The method of claim 1, wherein in the filtration stage, the size of the sieve pores for sieving large particulate matter is 1 μm to 4mm, and the microfiltration diameter of the microfiltration small suspended particles is 1 μm to 5 μm.
3. The process as claimed in claim 1, wherein in the aerobic adsorption stage, the dissolved oxygen concentration is 2mg/L to 5mg/L and the adsorption reaction time is less than 2 h.
4. The process of claim 1 wherein the reflux ratio of the biomass in the separation stage is from 50% to 90%.
5. The method of claim 1, wherein the anaerobic fermentation has a dissolved oxygen concentration of less than 0.5mg/L, a fermentation time of greater than 10 days, and a methane content of 50-80% in the biogas produced by the fermentation.
6. The method according to claim 1, wherein the dissolved oxygen concentration of the primary biological aerated filter is 1mg/L-3mg/L, and the retention time is 2h-6 h; the dissolved oxygen concentration of the secondary biological aerated filter is 1mg/L-2mg/L, and the retention time is 1h-4 h.
7. The method according to claim 1, wherein the filler of the biological filter of the two-stage aeration filter is volcanic rock, shale ceramsite, zeolite, expanded spherical clay and/or activated carbon;
preferably, the aeration mode of the two-stage aeration biological filter is blast aeration, mechanical aeration or jet aeration.
8. The method of claim 1, wherein the sterilization is performed by adding ozone, wherein the amount of ozone added is 1g/m3-4g/m3；
Preferably, the disinfection and sterilization time is 5min-30 min.
9. The method according to claim 1, wherein the COD of the gel-making wastewater is 7000mg/L-10000mg/L, and the ammonia nitrogen is 130mg/L-400 mg/L.
10. Purified water recovered from the treatment of waste water from the production of glue by the method of any one of claims 1 to 9, for use in the production of glue.
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