CN115806365A - Method for deep decolorization treatment of sodium sulfate evaporation mother liquor of coking wastewater - Google Patents
Method for deep decolorization treatment of sodium sulfate evaporation mother liquor of coking wastewater Download PDFInfo
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Abstract
The invention discloses a method for deep decoloring treatment of sodium sulfate evaporation mother liquor of coking wastewater, belonging to the technical field of decoloring of coking wastewater, and comprising the following steps of S1, iron-carbon oxidation decoloring: electrolyzing organic substances in the wastewater by utilizing self-electrolysis reaction of iron-carbon particles, and performing S2 biological treatment: degrading organic substances in the wastewater through the degradation of microorganisms and plants, and S3, ozone decoloring: oxidizing and degrading organic substances in the wastewater by using the oxidizing property of ozone, and S4, reagent decoloring: through adjusting pH to make metal ions such as sodium hydroxide and inorganic iron copper generate precipitation, remove inorganic metal ions that develop color in the waste water, S5, membrane filtration treatment: the mother liquor D is introduced into a reverse osmosis membrane filtering device for reverse osmosis membrane filtration, and the method carries out decolorization treatment on the sodium sulfate evaporation mother liquor of the coking wastewater through various ways, so that the treatment effect is good.
Description
Technical Field
The invention relates to the technical field of coking wastewater decolorization, in particular to a method for deeply decolorizing coking wastewater sodium sulfate evaporation mother liquor.
Background
The coking wastewater is typical toxic refractory organic wastewater. Mainly comes from the process water and the steam condensation wastewater in the coke oven gas primary cooling and coking production process.
The coke-oven plant mainly produces chemical products such as coke, commercial gas, ammonium sulfate, light benzene and the like. The tar recovery system of the plant adopts an ammonium sulfate flow, the tar processing adopts two-tower continuous distillation of a tubular furnace, and the industrial naphthalene production process comprises two-furnace two-tower continuous distillation, washing and refining. In the processes of coke oven gas cooling, washing, crude benzene processing and tar processing, industrial wastewater containing phenol, cyanogen, oil, ammonia and a large amount of organic matters is generated.
The coking wastewater is an industrial organic wastewater which has high CODcr, high phenol value, high ammonia nitrogen and is difficult to treat. The COD of the coking wastewater mainly comprises three parts of organic components, inorganic components and suspended matters. Wherein the organic COD is mainly phenol compounds, heterocyclic compounds and naphthalene substances, the phenol compounds mainly comprise phenol, o-cresol, p-cresol, o-p-cresol, xylenol, catechol, homologs thereof and the like, and the heterocyclic compounds comprise naphthalene, anthracene, phenanthrene, m-benzopyrene and the like; the phenolic compounds account for about 85% of the total organic matter, and the COD of the phenolic compounds accounts for about 30% of the total COD. The inorganic COD component includes SCN-, CN-, S2-, NO, etc., and SCN is the main component constituting the inorganic COD component. The suspended matter COD is mainly coal dust, coke dust and water-insoluble oil. Besides COD, the coking wastewater also contains ammonia nitrogen and salt components.
The method for extracting the sodium sulfate crystals from the coking wastewater generally takes the coking wastewater as a raw material, decolors and removes impurities, and then carries out concentration and crystallization to recycle the sodium sulfate, but the coking wastewater contains complex organic colored substances.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for deep decolorization treatment of sodium sulfate evaporation mother liquor of coking wastewater.
The technical scheme of the invention is as follows: a method for deep decolorization treatment of sodium sulfate evaporation mother liquor in coking wastewater comprises the following steps:
s1, oxidizing and decoloring iron carbon:
building an iron-carbon adsorption tank, filtering sodium sulfate evaporation mother liquor of coking wastewater by industrial filter cloth, introducing the filtered mother liquor into the iron-carbon adsorption tank, adding iron-carbon adsorption particles into the iron-carbon adsorption tank, wherein the solid-liquid mass ratio of the iron-carbon adsorption particles to the filtered mother liquor is 1;
s2, biological treatment:
building a biological pool, paving active sludge at the bottom of the biological pool, wherein the paving thickness of the active sludge is 20-30cm, and adding a microbial inoculum into the active sludge, wherein the adding amount of the microbial inoculum is 50-100g/m 3 Planting green plants on the activated sludge, introducing the mother liquor A obtained in the step S1 into a biological pool, wherein the ratio of the mass of the microbial agent to the mass of the mother liquor A flowing into the biological pool is 1:80-100, circulating the mother liquor A in the biological pond for 1-2 days, and then flowing out to obtain mother liquor B;
s3, ozone decoloring:
building an ozone aeration tank, laying a microporous ozone pipeline at the bottom of the ozone aeration tank, filtering mother liquor B by a filter screen with the mesh number of 80-90 meshes, introducing the filtered mother liquor B into the ozone aeration tank, wherein the diameter of micropores on the microporous ozone pipeline is 2-5mm, standing and precipitating for 1-2 days after aeration is finished, and allowing supernatant of the ozone aeration tank to flow out to obtain mother liquor C;
s4, reagent decoloration:
building two reagent tanks, introducing the mother liquor C into a first reagent tank, adding active carbon and a sodium hydroxide solution at the temperature of 20-30 ℃, stirring for 2-3 hours, after stirring, standing for 1-2 days, introducing the supernatant into a second reagent tank, adding a decolorizing agent, stirring at the speed of 60-80r/min, continuing to stir for 2-3 hours, and standing for 24-36 hours to allow the supernatant to flow out of the second reagent tank to obtain a mother liquor D;
s5, membrane filtration treatment:
and (4) introducing the mother liquor D into a reverse osmosis membrane filtering device for reverse osmosis membrane filtration, and obtaining decolorized mother liquor after filtration.
Furthermore, the mesh number of the industrial filter cloth in the step S1 is 300-500 meshes, and the grain diameter of the iron-carbon particles is 1-3cm.
Description of the invention: the industrial filter cloth filters the scum in the sodium sulfate evaporation mother liquor of the coking wastewater, and the iron-carbon particles can electrolyze and oxidize colored organic matters.
Furthermore, biomass activated carbon particles are added into the activated sludge in the step S2, the adding amount of the biomass activated carbon particles is 1.5-2.0% of the mass of the activated sludge, the particle size of the biomass activated carbon particles is 0.5-1.0mm, and the biomass activated carbon is prepared by mixing and stirring activated carbon and chitosan according to the mass ratio of 1.
Description of the drawings: the activated sludge is added with the biomass charcoal, so that the adsorption capacity of the activated sludge can be improved, and the functional groups of the chitosan can be combined with the sodium sulfate of the coking wastewater to evaporate organic matters and heavy metals in the mother liquor.
Further, the microbial agent in the step S2 is composed of the following components in percentage by mass: 3-8% of bacillus amyloliquefaciens, 5-15% of bacillus subtilis, 5-13% of aerococcus shallot, 7-16% of pleurotus citrinopileatus bacterial residue, 10-16% of bacillus citrobacter H-3 and the balance of sphingosine bacillus TH-5.
Description of the invention: the aim of decoloring is achieved by biologically and automatically degrading colored organic matters.
Further, the water temperature of the biological pond in the step S2 is 25-30 ℃, the pH value is 6.3-6.6, and the dissolved oxygen amount is 8-10%.
Description of the invention: the above conditions are favorable for the growth of the microbial inoculum and the microorganisms.
Further, the green plants in the step S2 consist of cattail, hyacinth and duckweed, the planting area ratio of cattail, hyacinth and duckweed is 1 2 The planting density of the water hyacinth is 4-5 plants/m 2 The planting density of the duckweed is 7-9 plants/m 2 。
Description of the drawings: the aim of decoloring is achieved by ecologically purifying colored substances in the wastewater.
Further, the decoloring agent in the step S4 is composed of the following components in parts by weight: 2-8 parts of plant ash, 7-16 parts of activated carbon particles, 5-8 parts of boric acid, 9-12 parts of clay, 12-15 parts of aluminum sulfate, 5-11 parts of polyacrylamide, 3-5 parts of sodium metabisulfite, 8-14 parts of sodium chlorate, 6-11 parts of dimethyl diallyl quaternary ammonium salt and 5-9 parts of titanium sol.
Description of the drawings: the decolorant has the function of adsorption to form flocculate so as to achieve the function of decoloration.
Further, the aperture of the reverse osmosis membrane used in the reverse osmosis membrane filtration in the step S5 is 1-2nm, and the working pressure of the reverse osmosis membrane is 4-10MPa.
Description of the invention: filtering suspended matters and sediments in the coking wastewater sodium sulfate evaporation mother liquor through a reverse osmosis membrane to obtain pure coking wastewater sodium sulfate evaporation mother liquor.
Further, in the step S4, the pipe wall pressure of the microporous ozone pipeline in the aeration tank is 0.1-0.3Mpa, the ozone aeration time is 24-36h, and the aeration amount per square meter in the aeration tank is 7-10m 3 /h。
Description of the drawings: the oxidation effect of the ozone is beneficial to the oxidative decomposition of colored substances in the sodium sulfate evaporation mother liquor of the coking wastewater.
Further, the adding amount of the sodium hydroxide in the step S4 is 50-100g/m 3 The adding amount of the active carbon is 100-125g/m 3 The addition amount of the decolorizing agent is 100-150g/m 3 。
Description of the drawings: after being added, the sodium hydroxide and non-ferrous metal ions generate a precipitate which is adsorbed by activated carbon and then precipitated to remove inorganic non-ferrous ions.
The invention has the beneficial effects that:
because the colored substances in the coking wastewater are complex and various and contain colored organic matters and inorganic matters, the method carries out decoloring treatment on the sodium sulfate evaporation mother liquor of the coking wastewater through various ways, has good treatment effect, and can effectively oxidize organic colored substances and colored inorganic components to ensure that the sodium sulfate evaporation mother liquor of the coking wastewater achieves the aim of decoloring.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
Example 1:
as shown in figure 1, the method for deeply decoloring coking wastewater sodium sulfate evaporation mother liquor comprises the following steps:
s1, iron-carbon oxidation decoloration:
building an iron-carbon adsorption tank, filtering sodium sulfate evaporation mother liquor of coking wastewater by industrial filter cloth, introducing the filtered mother liquor into the iron-carbon adsorption tank, adding iron-carbon adsorption particles into the iron-carbon adsorption tank, wherein the solid-liquid mass ratio of the iron-carbon adsorption particles to the filtered mother liquor is 1;
s2, biological treatment:
building a biological pond, paving activated sludge at the bottom of the biological pond, wherein the paving thickness of the activated sludge is 20-30cm, and adding a microbial agent into the activated sludgeThe addition amount of the microbial agent is 50g/m 3 Planting green plants on the activated sludge, introducing the mother liquor A obtained in the step S1 into the biological pool, wherein the ratio of the mass of the microbial agent to the mass of the mother liquor A flowing into the biological pool is 1:80, circulating the mother liquor A in the biological pool for 1 day and then flowing out to obtain mother liquor B;
s3, ozone decoloring:
building an ozone aeration tank, laying a microporous ozone pipeline at the bottom of the ozone aeration tank, filtering mother liquor B by a filter screen with the mesh number of 80 meshes, introducing the filtered mother liquor B into the ozone aeration tank, wherein the diameter of micropores on the microporous ozone pipeline is 2mm, standing and precipitating for 1 day after aeration, and allowing supernatant of the ozone aeration tank to flow out to obtain mother liquor C;
s4, reagent decoloration:
building two reagent tanks, introducing the mother liquor C into a first reagent tank, adding activated carbon and a sodium hydroxide solution at the temperature of 20-30 ℃, stirring for 2 hours after the mass concentration of the sodium hydroxide solution is 30%, introducing the supernatant into a second reagent tank, adding a decolorizing agent after the stirring is finished and standing for 1 day, wherein the stirring speed is 60r/min, continuing stirring for 2 hours, and standing for 24 hours to allow the supernatant to flow out of the second reagent tank to obtain a mother liquor D;
s5, membrane filtration treatment:
and (4) introducing the mother liquor D into a reverse osmosis membrane filtering device for reverse osmosis membrane filtration, and obtaining decolorized mother liquor after filtration.
In the step S1, the mesh number of the industrial filter cloth is 300 meshes, the grain diameter of iron carbon particles is 1-3cm, the industrial filter cloth filters scum in sodium sulfate evaporation mother liquor of coking wastewater, and the iron carbon particles can electrolyze and oxidize colored organic matters.
The microbial agent in the step S2 comprises the following components in percentage by mass: 3% of bacillus amyloliquefaciens, 5% of bacillus subtilis, 5% of aerococcus shallowi, 7% of pleurotus citrinopileatus bacterial residue, 10% of bacillus citrate H-3 and the balance of sphingosine bacillus T-5, and the aim of decoloring is achieved by biologically and automatically degrading colored organic matters.
And S2, the water temperature of the biological pond is 25 ℃, the pH value is 6.3, and the dissolved oxygen is 8%, so that the growth of microbial agents and microorganisms is facilitated.
Step S2, green plants are composed of cattail, hyacinth and duckweed, the planting area ratio of cattail, hyacinth and duckweed is 1 2 The planting density of the water hyacinth is 4 plants/m 2 The planting density of the duckweed is 7 plants/m 2 The aim of decoloring is achieved by ecologically purifying the colored substances in the wastewater.
And S4, the decoloring agent consists of the following components in parts by weight: 2 parts of plant ash, 7 parts of activated carbon particles, 5 parts of boric acid, 9 parts of clay, 12 parts of aluminum sulfate, 5 parts of polyacrylamide, 3 parts of sodium metabisulfite, 8 parts of sodium chlorate, 6 parts of dimethyl diallyl quaternary ammonium salt and 5 parts of titanium sol, wherein the decoloring agent has an adsorption effect to form flocculate so as to achieve the decoloring effect.
And (5) in the step (S5), the aperture of a reverse osmosis membrane used in the reverse osmosis membrane filtration is 1-2nm, the working pressure of the reverse osmosis membrane is 4MPa, and suspended matters and sediments in the coking wastewater sodium sulfate evaporation mother liquor are filtered through the reverse osmosis membrane to obtain pure coking wastewater sodium sulfate evaporation mother liquor.
In the step S4, the pipe wall pressure of the microporous ozone pipeline in the aeration tank is 0.1Mpa, the ozone aeration time is 24 hours, and the aeration rate per square meter in the aeration tank is 7m 3 And h, the oxidation effect of the ozone is favorable for the oxidative decomposition of the colored substances in the sodium sulfate evaporation mother liquor of the coking wastewater.
The amount of sodium hydroxide added in step S4 was 50g/m 3 The adding amount of the active carbon is 100g/m 3 The addition amount of the decolorizing agent is 100g/m 3 After being added, the sodium hydroxide and nonferrous metal ions generate a precipitate which is adsorbed by active carbon and then precipitated to remove inorganic colored ions.
Example 2:
as shown in figure 1, the method for deeply decoloring coking wastewater sodium sulfate evaporation mother liquor comprises the following steps:
s1, iron-carbon oxidation decoloration:
building an iron-carbon adsorption tank, filtering sodium sulfate evaporation mother liquor of coking wastewater by using industrial filter cloth, introducing the filtered mother liquor into the iron-carbon adsorption tank, adding iron-carbon adsorption particles into the iron-carbon adsorption tank, wherein the solid-liquid mass ratio of the iron-carbon adsorption particles to the filtered mother liquor is 1;
s2, biological treatment:
building a biological pool, paving activated sludge at the bottom of the biological pool, wherein the paving thickness of the activated sludge is 25cm, and adding a microbial inoculum into the activated sludge, wherein the adding amount of the microbial inoculum is 80g/m 3 Planting green plants on the activated sludge, introducing the mother liquor A obtained in the step S1 into a biological pool, wherein the ratio of the mass of the microbial inoculum to the mass of the mother liquor A flowing into the biological pool is 1:90, circulating the mother liquor A in the biological pond for 1.5 days and then flowing out to obtain mother liquor B;
s3, ozone decoloration:
building an ozone aeration tank, laying a micropore ozone pipeline at the bottom of the ozone aeration tank, filtering the mother liquor B by a filter screen, introducing the filtered mother liquor B into the ozone aeration tank, wherein the mesh number of the filter screen is 85 meshes, the diameter of micropores on the micropore ozone pipeline is 4mm, standing and precipitating for 1.5 days after aeration, and allowing supernatant of the ozone aeration tank to flow out to obtain mother liquor C;
s4, reagent decoloration:
building two reagent pools, introducing the mother liquor C into a first reagent pool, adding activated carbon and a sodium hydroxide solution at 25 ℃, stirring for 2.5 hours, standing for 1.5 days after stirring, introducing the supernatant into a second reagent pool, adding a decoloring agent, stirring at a speed of 70r/min, continuing to stir for 2.5 hours, and standing for 30 hours to allow the supernatant to flow out of the second reagent pool to obtain a mother liquor D;
s5, membrane filtration treatment:
and (4) introducing the mother liquor D into a reverse osmosis membrane filtering device for reverse osmosis membrane filtration, and obtaining decolorized mother liquor after filtration.
In the step S1, the mesh number of the industrial filter cloth is 400 meshes, the grain diameter of iron carbon particles is 1-3cm, the industrial filter cloth filters scum in sodium sulfate evaporation mother liquor of coking wastewater, and the iron carbon particles can electrolyze and oxidize colored organic matters.
The microbial agent in the step S2 comprises the following components in percentage by mass: 4% of bacillus amyloliquefaciens, 10% of bacillus subtilis, 10% of aerococcus shallowi, 10% of pleurotus citrinopileatus bacterial residue, 13% of bacillus citrate H-3 and the balance of sphingosine bacillus T-5, and the aim of decoloring is achieved by biologically and automatically degrading colored organic matters.
And S2, the water temperature of the biological pond is 28 ℃, the pH value is 6.5, and the dissolved oxygen is 9%, so that the growth of the microbial inoculum and the microorganisms is facilitated.
S2, green plants are composed of cattail, water hyacinth and duckweed, the planting area ratio of the cattail, the water hyacinth and the duckweed is 1 2 The planting density of the water hyacinth is 5 plants/m 2 The planting density of the duckweed is 8 plants/m 2 The aim of decoloring is achieved by ecologically purifying the colored substances in the wastewater.
And S4, the decoloring agent consists of the following components in parts by weight: 7 parts of plant ash, 14 parts of activated carbon particles, 7 parts of boric acid, 10 parts of clay, 13 parts of aluminum sulfate, 8 parts of polyacrylamide, 4 parts of sodium metabisulfite, 10 parts of sodium chlorate, 10 parts of dimethyl diallyl quaternary ammonium salt and 8 parts of titanium sol, wherein the decoloring agent has an adsorption effect to form flocculate so as to achieve the decoloring effect.
And (5) filtering through a reverse osmosis membrane, wherein the aperture of the reverse osmosis membrane used in the reverse osmosis membrane filtration in the step S5 is 1-2nm, the working pressure of the reverse osmosis membrane is 5MPa, and filtering suspended matters and sediments in the coking wastewater sodium sulfate evaporation mother liquor through the reverse osmosis membrane to obtain pure coking wastewater sodium sulfate evaporation mother liquor.
In the step S4, the pipe wall pressure of the micropore ozone pipeline in the aeration tank is 0.2Mpa, the ozone aeration time is 30 hours, and the aeration quantity per square meter in the aeration tank is 8m 3 And h, the oxidation effect of the ozone is favorable for the oxidative decomposition of the colored substances in the sodium sulfate evaporation mother liquor of the coking wastewater.
The amount of sodium hydroxide added in step S4 was 80g/m 3 The adding amount of the activated carbon is 110g/m 3 The addition amount of the decoloring agent is 125g/m 3 After being added, the sodium hydroxide and nonferrous metal ions generate a precipitate which is adsorbed by active carbon and then precipitated to remove inorganic colored ions.
Example 3:
as shown in figure 1, the method for deeply decoloring coking wastewater sodium sulfate evaporation mother liquor comprises the following steps:
s1, iron-carbon oxidation decoloration:
building an iron-carbon adsorption tank, filtering sodium sulfate evaporation mother liquor of coking wastewater by industrial filter cloth, introducing the filtered mother liquor into the iron-carbon adsorption tank, adding iron-carbon adsorption particles into the iron-carbon adsorption tank, wherein the solid-liquid mass ratio of the iron-carbon adsorption particles to the filtered mother liquor is 1;
s2, biological treatment:
building a biological pool, paving active sludge at the bottom of the biological pool, wherein the paving thickness of the active sludge is 30cm, and adding a microbial inoculum into the active sludge, wherein the adding amount of the microbial inoculum is 100g/m 3 Planting green plants on the activated sludge, introducing the mother liquor A obtained in the step S1 into the biological pool, wherein the ratio of the mass of the microbial agent to the mass of the mother liquor A flowing into the biological pool is 1:100, circulating the mother liquor A in the biological pool for 2 days and then flowing out to obtain mother liquor B;
s3, ozone decoloring:
building an ozone aeration tank, laying a microporous ozone pipeline at the bottom of the ozone aeration tank, filtering mother liquor B by a filter screen with the mesh number of 90 meshes, introducing the filtered mother liquor B into the ozone aeration tank, wherein the diameter of micropores on the microporous ozone pipeline is 5mm, standing and precipitating for 2 days after aeration, and allowing supernatant of the ozone aeration tank to flow out to obtain mother liquor C;
s4, reagent decoloration:
building two reagent pools, introducing the mother liquor C into the first reagent pool, adding active carbon and a sodium hydroxide solution at the temperature of 30 ℃, stirring for 3 hours, standing for 2 days after stirring, introducing the supernatant into the second reagent pool, adding a decolorizing agent, stirring at the speed of 80r/min, continuing to stir for 3 hours, standing for 36 hours, and allowing the supernatant to flow out of the second reagent pool to obtain a mother liquor D;
s5, membrane filtration treatment:
and (4) introducing the mother liquor D into a reverse osmosis membrane filtering device for reverse osmosis membrane filtration, and obtaining decolorized mother liquor after filtration.
In the step S1, the mesh number of the industrial filter cloth is 500 meshes, the grain diameter of iron carbon particles is 3cm, the industrial filter cloth filters the sodium sulfate evaporation scum in the coking wastewater, and the iron carbon particles can electrolyze and oxidize colored organic matters.
The microbial agent in the step S2 comprises the following components in percentage by mass: 8 percent of bacillus amyloliquefaciens, 15 percent of bacillus subtilis, 13 percent of aerococcus shallownsis, 16 percent of pleurotus citrinopileatus bacterial residue, 16 percent of bacillus citrobacter H-3 and the balance of sphingosine neoformans TH-5, and the aim of decoloring is achieved by biologically and automatically degrading colored organic matters.
And S2, the water temperature of the biological pond is 30 ℃, the pH value is 6.6, and the dissolved oxygen amount is 10%, so that the growth of the microbial inoculum and the microorganisms is facilitated.
S2, green plants are composed of cattail, water hyacinth and duckweed, the planting area ratio of the cattail, the water hyacinth and the duckweed is 1 2 The planting density of the water hyacinth is 5 plants/m 2 The planting density of the duckweed is 9 plants/m 2 The aim of decoloring is achieved by ecologically purifying colored substances in the wastewater.
And S4, the decoloring agent consists of the following components in parts by weight: 8 parts of plant ash, 16 parts of activated carbon particles, 8 parts of boric acid, 12 parts of clay, 15 parts of aluminum sulfate, 11 parts of polyacrylamide, 5 parts of sodium metabisulfite, 14 parts of sodium chlorate, 11 parts of dimethyl diallyl quaternary ammonium salt and 9 parts of titanium sol, wherein the decoloring agent has an adsorption effect to form flocculate so as to achieve the decoloring effect.
And (5) filtering through a reverse osmosis membrane, wherein the aperture of the reverse osmosis membrane used in the reverse osmosis membrane filtration in the step S5 is 1-2nm, the working pressure of the reverse osmosis membrane is 10MPa, and filtering through the reverse osmosis membrane to obtain the pure sodium sulfate evaporation mother liquor of the coking wastewater.
In the step S4, the pipe wall pressure of the microporous ozone pipeline in the aeration tank is 0.3Mpa, the ozone aeration time is 24-36h, and the aeration quantity per square meter in the aeration tank is 10m 3 And h, the oxidation effect of the ozone is favorable for the oxidative decomposition of the colored substances in the sodium sulfate evaporation mother liquor of the coking wastewater.
The adding amount of the sodium hydroxide in the step S4 is 50-100g/m 3 The adding amount of the active carbon is 125g/m 3 The addition amount of the decolorizing agent is 100-150g/m 3 After being added, the sodium hydroxide and nonferrous metal ions generate a precipitate which is adsorbed by active carbon and then precipitated to remove inorganic colored ions.
Comparative example 1 to example 3, example 3 is the best example in practical use because the decoloring effect is the best.
Example 4:
on the basis of the embodiment 3, the difference between the embodiment 4 and the embodiment 3 is that the activated sludge in the step S2 is also added with biomass activated carbon particles, the adding amount of the biomass activated carbon particles is 1.5% of the mass of the activated sludge, the particle size of the biomass activated carbon particles is 0.5mm, the biomass activated carbon is prepared by mixing and stirring activated carbon and chitosan according to the mass ratio of 1.
Example 5:
on the basis of the embodiment 3, the difference between the embodiment 5 and the embodiment 3 is that the activated sludge in the step S2 is also added with biomass activated carbon particles, the adding amount of the biomass activated carbon particles is 1.8% of the mass of the activated sludge, the particle size of the biomass activated carbon particles is 0.8mm, the biomass activated carbon is prepared by mixing and stirring activated carbon and chitosan according to the mass ratio of 1.
Example 6:
on the basis of the embodiment 3, the difference between the embodiment 6 and the embodiment 3 is that the activated sludge in the step S2 is also added with biomass activated carbon particles, the adding amount of the biomass activated carbon particles is 2.0% of the mass of the activated sludge, the particle size of the biomass activated carbon particles is 1.0mm, the biomass activated carbon is prepared by mixing and stirring activated carbon and chitosan according to the mass ratio of 1.
Comparative example 4 to example 6, example 6 is the best example in the actual decoloring treatment, and thus example 6 is the best example.
Claims (10)
1. The method for deep decolorization treatment of sodium sulfate evaporation mother liquor in coking wastewater is characterized by comprising the following steps of:
s1, iron-carbon oxidation decoloration:
building an iron-carbon adsorption tank, filtering sodium sulfate evaporation mother liquor of coking wastewater by using industrial filter cloth, introducing the filtered mother liquor into the iron-carbon adsorption tank, adding iron-carbon adsorption particles into the iron-carbon adsorption tank, wherein the solid-liquid mass ratio of the iron-carbon adsorption particles to the filtered mother liquor is 1;
s2, biological treatment:
building a biological pool, paving activated sludge at the bottom of the biological pool, wherein the paving thickness of the activated sludge is 20-30cm, and adding a microbial agent into the activated sludge, wherein the adding amount of the microbial agent is 50-100g/m 3 Planting green plants on the activated sludge, introducing the mother liquor A obtained in the step S1 into a biological pool, wherein the mass of the microbial agent and the inflow organismsThe mass ratio of the mother liquor A in the pool is 1:80-100, circulating the mother liquor A in the biological pool for 1-2 days, and then flowing out to obtain mother liquor B;
s3, ozone decoloring:
building an ozone aeration tank, laying a micropore ozone pipeline at the bottom of the ozone aeration tank, filtering mother liquor B by a filter screen, wherein the mesh number of the filter screen is 80-90 meshes, introducing the filtered mother liquor B into the ozone aeration tank, wherein the diameter of micropores on the micropore ozone pipeline is 2-5mm, standing and precipitating for 1-2 days after aeration is finished, and allowing supernatant of the ozone aeration tank to flow out to obtain mother liquor C;
s4, reagent decoloration:
building two reagent tanks, introducing the mother liquor C into a first reagent tank, adding active carbon and a sodium hydroxide solution at the temperature of 20-30 ℃, stirring for 2-3 hours, after stirring, standing for 1-2 days, introducing the supernatant into a second reagent tank, adding a decolorizing agent, stirring at the speed of 60-80r/min, continuing to stir for 2-3 hours, and standing for 24-36 hours to allow the supernatant to flow out of the second reagent tank to obtain a mother liquor D;
s5, membrane filtration treatment:
and (4) introducing the mother liquor D into a reverse osmosis membrane filtering device for reverse osmosis membrane filtration, and obtaining decolorized mother liquor after filtration.
2. The method for deep decoloring of sodium sulfate evaporation mother liquor of coking wastewater according to claim 1, wherein the mesh number of the industrial filter cloth in the step S1 is 300-500 meshes, and the grain size of the iron-carbon particles is 1-3cm.
3. The method for deep decolorization of sodium sulfate evaporation mother liquor in coking wastewater according to claim 1, wherein in step S2, biomass activated carbon particles are added to the activated sludge, the addition amount of the biomass activated carbon particles is 1.5-2.0% of the mass of the activated sludge, the particle size of the biomass activated carbon particles is 0.5-1.0mm, and the biomass activated carbon is prepared by mixing activated carbon and chitosan according to a mass ratio of 1.
4. The method for deep decolorization treatment of sodium sulfate evaporation mother liquor in coking wastewater according to claim 1, wherein the microbial agent in the step S2 comprises the following components in percentage by mass: 3-8% of bacillus amyloliquefaciens, 5-15% of bacillus subtilis, 5-13% of aerococcus shallot, 7-16% of pleurotus citrinopileatus bacterial residue, 10-16% of bacillus citrobacter H-3 and the balance of sphingosine bacillus TH-5.
5. The method for deep decolorization treatment of sodium sulfate evaporation mother liquor in coking wastewater according to claim 1, wherein the water temperature of the biological pond in the step S2 is 25-30 ℃, the pH value is 6.3-6.6, and the dissolved oxygen is 8-10%.
6. The method for deep decolorization treatment of sodium sulfate evaporation mother liquor in coking wastewater according to claim 1, wherein the green plants in step S2 are composed of cattail, water hyacinth and duckweed, the planting area ratio of cattail, water hyacinth and duckweed is 1 2 The planting density of the water hyacinth is 4-5 plants/m 2 The planting density of the duckweed is 7-9 plants/m 2 。
7. The method for deep decolorization treatment of sodium sulfate evaporation mother liquor in coking wastewater according to claim 1, wherein the decolorizing agent in step S4 comprises the following components in parts by weight: 2-8 parts of plant ash, 7-16 parts of activated carbon particles, 5-8 parts of boric acid, 9-12 parts of clay, 12-15 parts of aluminum sulfate, 5-11 parts of polyacrylamide, 3-5 parts of sodium metabisulfite, 8-14 parts of sodium chlorate, 6-11 parts of dimethyl diallyl quaternary ammonium salt and 5-9 parts of titanium sol.
8. The method for deep decolorization treatment of sodium sulfate evaporation mother liquor in coking wastewater according to claim 1, wherein the pore diameter of the reverse osmosis membrane used in the reverse osmosis membrane filtration in the step S5 is 1-2nm, and the working pressure of the reverse osmosis membrane is 4-10MPa.
9. Such asThe method for the deep decolorization treatment of sodium sulfate evaporation mother liquor of coking wastewater according to claim 1, wherein in step S4, the pressure of the pipe wall of the microporous ozone pipeline in the aeration tank is 0.1-0.3Mpa, the ozone aeration time is 24-36h, and the aeration amount per square meter in the aeration tank is 7-10m 3 /h。
10. The method for deep decolorization treatment of sodium sulfate evaporation mother liquor in coking wastewater according to claim 1, wherein the addition amount of sodium hydroxide in the step S4 is 50-100g/m 3 The adding amount of the active carbon is 100-125g/m 3 The addition amount of the decolorizing agent is 100-150g/m 3 。
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