CN111320295A - Pretreatment equipment and method for advanced treatment and recycling of industrial wastewater - Google Patents
Pretreatment equipment and method for advanced treatment and recycling of industrial wastewater Download PDFInfo
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- CN111320295A CN111320295A CN201911340545.6A CN201911340545A CN111320295A CN 111320295 A CN111320295 A CN 111320295A CN 201911340545 A CN201911340545 A CN 201911340545A CN 111320295 A CN111320295 A CN 111320295A
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- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 70
- 238000004064 recycling Methods 0.000 title claims abstract description 26
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
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- 238000004062 sedimentation Methods 0.000 claims abstract description 38
- 239000002351 wastewater Substances 0.000 claims abstract description 33
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
- C02F2209/055—Hardness
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
Abstract
The invention discloses a pretreatment device and a method for advanced treatment and recycling of industrial wastewater, which comprises a combined coagulation-precipitation and micro-flocculation filter device, wherein under the condition of introducing ozone, polyaluminium chloride and dicyandiamide formaldehyde polycondensation resin compound coagulant are added into the combined coagulation-precipitation for treatment, the treated industrial wastewater enters an inclined plate sedimentation tank for mud-water separation, the separated supernatant enters a micro-flocculation filter device consisting of a pipeline mixer and a micro-flocculation filter column, polyaluminium chloride is added into the pipeline mixer at the same time, the industrial wastewater flows through the pipeline mixer and is fully mixed with the polyaluminium chloride in the pipeline mixer, and then enters the subsequent micro-flocculation filter column, and the polyaluminium chloride and active carbon fillers in the filter column mutually promote COD (chemical oxygen demand) to further degrade SS (suspended solids) and chromaticity in the wastewater. The COD and the chromaticity of the treated effluent are both low, the water inlet requirement of a double-membrane method is completely met, the dosage of the medicament is small, the occupied area of equipment is small, and the method has great engineering application value.
Description
Technical Field
The invention belongs to the field of industrial wastewater treatment, and particularly relates to pretreatment equipment for advanced treatment and recycling of industrial wastewater. The invention also relates to a pretreatment method for advanced treatment and recycling of industrial wastewater.
Background
In recent years, with the continuous development of new industries in China, the variety and the number of pollutants entering a water body environment are remarkably increased due to the large use of chemical raw materials. At present, after industrial wastewater is subjected to biochemical treatment, the residual concentration of organic matters is still high; especially for some industrial wastewater of coking, dye, paper making, leather making and the like, the organic pollutant concentration is high, the chromaticity is large, colored groups are not easy to crack and remove, the wastewater after biochemical treatment can not meet the standard-reaching requirements of relevant environmental protection regulations, and further advanced treatment is needed. With the stricter and stricter requirements of the environmental protection department in China on the discharge index of the wastewater generated in the production process of industrial enterprises and the enhancement of the social environmental protection consciousness, the advanced treatment of the wastewater and the reuse of the wastewater in factories become the targets pursued by many enterprises.
The prior advanced treatment and recycling technology of high-concentration high-chroma organic industrial wastewater is mature in application and is a pretreatment and membrane separation combined technology. Among them, the pretreatment technology includes advanced oxidation, combination of oxidation and coagulation, coagulation adsorption coupling, etc., and the development of membrane separation technology has reached the maturity basically. According to the operation experience of the current engineering project, the method has the main problem of serious membrane pollution because on one hand, the pretreatment before the membrane separation method can not effectively remove oil, hardness and Fe in the wastewater2+Macromolecular organic substances and the like, and the wastewater after pretreatment can not meet the water inlet requirement (COD) of the membrane<50 mg/L); on the other hand, when wastewater is pretreated by flocculation precipitation, Fenton reagent and the like, a large amount of iron ions (Fe2+) are introduced into the wastewater, so that the pollution and the scaling of a membrane system are aggravated. Therefore, the pretreatment technology in the advanced treatment technology is still in the research and exploration stage.
Disclosure of Invention
Aiming at overcoming the defect that the prior art can not effectively remove oil, hardness and Fe in industrial wastewater2+Macromolecular organic substances and the like, and the defects of heavy membrane system pollution and scaling when the wastewater is pretreated, the invention provides pretreatment equipment and a pretreatment method for advanced treatment and recycling of industrial wastewater.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a pretreatment device for advanced treatment and recycling of industrial wastewater comprises a combined coagulation-precipitation device, a No. 2 water collecting tank, a No. 2 lift pump, a micro-flocculation filtering device and a filtrate collecting container, wherein the combined coagulation-precipitation device is connected with one end of the micro-flocculation filtering device through the No. 2 water collecting tank and the No. 2 lift pump, and the other end of the micro-flocculation filtering device is connected with the filtrate collecting container; the combined coagulation-precipitation device comprises a No. 1 water collecting tank, a No. 1 lift pump, a combined coagulation tank, an ozone generator and an inclined plate precipitation tank, wherein the No. 1 water collecting tank is connected with a water inlet of the combined coagulation tank after passing through the No. 1 lift pump, a water outlet of the combined coagulation tank is connected with the top of the side of the combined coagulation tank of the inclined plate precipitation tank, a water outlet groove of the inclined plate precipitation tank at the top of the other side of the inclined plate precipitation tank is connected with the top of the No. 2 water collecting tank through a pipeline, cover plates are added to the tops of the combined coagulation tank and the inclined plate precipitation tank, the tops of the cover plates are connected with a tail gas destruction device through a tail gas; the micro-flocculation filtering device comprises a pipeline mixer and a micro-flocculation filtering column, one end of the pipeline mixer is connected with a 2# lifting pump, the other end of the pipeline mixer is connected with the top of the micro-flocculation filtering column through a pipeline, the bottom of the pipeline mixer is connected with a stirrer, and the bottom of the micro-flocculation filtering column is connected with the top of a filtrate collecting container through an industrial wastewater discharge pipeline.
Furthermore, a water distribution hose is uniformly arranged on a top cover plate of the micro flocculation filtration column, holes are uniformly arranged on the water distribution hose, and the water distribution hose has 6 branch pipes in total.
Furthermore, at least two combined coagulation tank baffles are longitudinally arranged in the combined coagulation tank, the end parts of the combined coagulation tank baffles are vertically connected with the inner side of the combined coagulation tank in a staggered manner, and the height of the combined coagulation tank baffles is smaller than that of the combined coagulation tank.
Further, an aeration head is arranged at the bottom of the combined coagulation tank, and the bottom of the aeration head is connected with the bottom of the side surface of the ozone generator through a pipeline. The aeration head is made of titanium alloy material.
Furthermore, an inverted L-shaped inclined plate sedimentation tank baffle is arranged at the position, located at the water outlet of the combined coagulation tank, of the inclined plate sedimentation tank, an inclined pipe is arranged on the inner side of a cavity formed by the inclined plate sedimentation tank baffle, and a sludge hopper is arranged at the bottom of the inclined plate sedimentation tank.
Further, a pressure release valve and an automatic exhaust valve are sequentially arranged on the tail gas pipeline, and a ball valve and a glass rotameter are sequentially arranged on the industrial wastewater discharge pipeline.
Further, the agitator includes the medicament blender, be equipped with stirring vane in the medicament blender, the stirring vane top is connected with agitator motor.
A method for carrying out pretreatment in advanced treatment and recycling of industrial wastewater by using the above-mentioned personnel comprises the following steps: after ozone O is introduced3Under the condition, adding a polyaluminium chloride PAC and a dicyandiamide formaldehyde polycondensation resin compound coagulant with the volume fraction of 5 percent into a combined coagulation tank to remove most suspended substances SS, colloidal substances and partial soluble organic matters in industrial wastewater; then the industrial wastewater enters an inclined plate sedimentation tank for mud-water separation, the separated sludge is periodically cleaned and discharged through a pipeline through a sludge hopper at the bottom of the inclined plate sedimentation tank, the supernatant flows out through a water outlet tank of the inclined plate sedimentation tank, the supernatant in the industrial wastewater passes through the micro-flocculation filter device in a continuous flow mode, the hydraulic retention time of the industrial wastewater in the micro-flocculation filter device is 1-2h, the industrial wastewater passes through a pipeline mixer in the micro-flocculation filter device, polyaluminium chloride PAC with the concentration of 100mg/L is added into the pipeline mixer, the industrial wastewater is fully mixed with the added polyaluminium chloride PAC, then the industrial wastewater is mutually promoted by filler in a micro-flocculation filter column in the micro-flocculation filter device, the COD, SS and chromaticity in the wastewater are further degraded, and the industrial wastewater is filtered by the micro-flocculation filter column and then discharged from a water outlet of the micro-flocculation filter column, the COD and the chroma removal rate of the discharged industrial wastewater completely meet the water inlet requirement of a double-membrane method.
Further, the preparation method of the compound coagulant comprises the following steps: dissolving PAC powder solid by using distilled water to enable the concentration of the solution to reach 6%, then diluting the dicyandiamide formaldehyde polycondensation resin viscous liquid into a solution with the concentration of 4%, slowly adding the dicyandiamide formaldehyde polycondensation resin solution into the PAC solution at the temperature of 30 ℃, controlling the volume ratio of the PAC to the dicyandiamide formaldehyde polycondensation resin solution to be 1:1, stirring the mixed solution for 60min, controlling the stirring speed to be 100 plus materials at 800r/min, standing for 36-48h to obtain the composite coagulant, wherein the mass fractions of the PAC and the dicyandiamide formaldehyde polycondensation resin in the composite coagulant are respectively 3% and 2%, and storing the cured solution in a dark place. The compound coagulant has the main function of destabilizing SS and colloidal substances in the wastewater through the actions of electrical neutralization and adsorption bridging.
Further, the ozone is generated by an ozone generator, the ozone enters a combined coagulation tank through an aeration head arranged at the bottom of the tank, and the concentration of the ozone in the combined coagulation tank is 70 mg/L; and the hydraulic retention time of the industrial wastewater in the combined coagulation tank is 20-30 min. The ozone generator is an air type generator. Ozone has a coagulation aiding effect, and the introduction of ozone can increase oxygen-containing functional group organic matters in the wastewater, so that the oxygen-containing functional group organic matters and metal salt hydrolysis products in the compound coagulant form polymers, thereby increasing the removal of refractory organic substances; in addition, the ozone can promote the hydrolysis of the compound coagulant, so that more polymerized peptide hydrolysate is formed, the coagulation effect is improved, and the removal of soluble organic matters is improved. In addition, gas is introduced into the combined coagulation tank, so that the effects of stirring and mixing can be achieved.
Furthermore, the micro-flocculation filter column is a cylindrical continuous flow reaction device, the filter column is made of a polypropylene resin material, the height of the filter column is 1000mm, the diameter of the filter column is 150mm, ceramsite and granular activated carbon filler are sequentially filled in the filter column from bottom to top, the granular activated carbon is coal activated carbon, the granularity of the granules is 2-4mm, and the height of the granular activated carbon filler is 600 mm.
The device and the method are suitable for pretreatment in advanced treatment and recycling of high-concentration high-chroma organic industrial wastewater.
The composite coagulant is prepared from PAC and dicyandiamide-formaldehyde polycondensation resin, can fully play the electric neutralization function of inorganic macromolecules and the adsorption and bridging function of organic macromolecules, and researches show that the PAC and the dicyandiamide-formaldehyde polycondensation resin have mutual promotion function, the pH value of wastewater does not need to be adjusted in the reaction process, the reaction can be carried out at normal temperature, and the generated sludge amount is small; ozone has coagulation promoting effect, and ozone can increase oxygen-containing functional group organic matter in wastewater to make it and compoundThe metal salt hydrolysate in the coagulant can form polymers, and the ozone can promote the hydrolysis of the compound coagulant to form more polymer peptide hydrolysates, so that the coagulation effect is improved, and the removal of refractory organic matters is improved; the activated carbon can promote flocculation, the wastewater has dual functions of flocculation and filtration in the micro-flocculation filter column, and the micro-flocculation filter column device is simple and easy to obtain, thereby not only reducing the complex process flow, but also saving the cost; fe is not introduced into the system2+The plasma metal ions have certain slowing-down effect on membrane pollution in the subsequent membrane separation technology; the method has the advantages of less added medicament types, corresponding reduction of the number of system treatment structures and devices, small occupied area and simple operation flow.
Drawings
The invention will now be further described with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the apparatus of the present invention.
FIG. 2 is a water distribution structure diagram of the micro-flocculation filter column of the invention.
Description of reference numerals: 1. the system comprises a combined coagulation-sedimentation device, a 2, a micro-flocculation filtration device, a 3, a 2# water collection tank, a 4, a 2# lift pump, a 5, a glass rotameter, a 6, a filtrate collection container, a 7, a 1# water collection tank, an 8, a 1# lift pump, a 9, a combined coagulation tank, a 10, an inclined plate sedimentation tank, a 11, a combined coagulation tank water inlet, a 12, a combined coagulation tank baffle, a 13, a combined coagulation tank water outlet, a 14, an inclined plate sedimentation tank baffle, a 15, an inclined pipe, a 16, an inclined plate sedimentation tank water outlet groove, a 17, a sludge hopper, a 18, a cover plate, a 19, a pressure release valve, a 20, an automatic exhaust valve, a 21, an ozone generator, a 22, an aeration head, a 23, a medicament mixing container, a 24, a pipeline mixer, a 25, a micro-flocculation filtration column, a.
Detailed Description
The present invention is further described in detail with reference to the following examples, but the scope of the claims is not limited thereto.
Example 1
The pretreatment equipment for advanced treatment and recycling of industrial wastewater comprises a combined coagulation-precipitation device 1, a No. 2 water collection tank 3, a No. 2 lift pump 4, a micro-flocculation filter device 2 and a filtrate collection container, wherein the combined coagulation-precipitation device 1 is connected with one end of the micro-flocculation filter device 2 after passing through the No. 2 water collection tank 3 and the No. 2 lift pump 4, and the other end of the micro-flocculation filter device 2 is connected with the filtrate collection container 6; the combined coagulation-sedimentation device 1 comprises a No. 1 water collecting tank 7, a No. 1 lift pump 8, a combined coagulation tank 9, an ozone generator 21 and an inclined plate sedimentation tank 10, wherein the No. 1 water collecting tank 7 is connected with a combined coagulation tank water inlet 11 after passing through the No. 1 lift pump 8, a combined coagulation tank water outlet 13 is connected with the top of the side of the combined coagulation tank 9 of the inclined plate sedimentation tank 10, an inclined plate sedimentation tank water outlet groove 16 at the top of the other side of the inclined plate sedimentation tank 10 is connected with the top of the No. 2 water collecting tank 3 through a pipeline, cover plates 18 are added on the tops of the combined coagulation tank 9 and the inclined plate sedimentation tank 10, the top of each cover plate 18 is connected with a tail gas destruction device through a tail gas pipeline, and the bottom of the; the micro-flocculation filtering device 2 comprises a pipeline mixer 24 and a micro-flocculation filter column 25, one end of the pipeline mixer 24 is connected with the 2# lifting pump 4, the other end of the pipeline mixer 24 is connected with the top of the micro-flocculation filter column 25 through a pipeline, the bottom of the pipeline mixer 24 is connected with a stirrer 27, and the bottom of the micro-flocculation filter column 25 is connected with the top of a filtrate collecting container 6 through an industrial wastewater discharge pipeline.
Furthermore, water distribution hoses 28 are uniformly arranged on the top cover plate 18 of the micro flocculation filtration column 25, holes are uniformly arranged on the water distribution hoses 28, and the total number of the water distribution hoses 28 is 6.
Furthermore, at least two combined coagulation tank baffles 12 are longitudinally arranged in the combined coagulation tank 9, the end parts of the combined coagulation tank baffles 12 are vertically connected with the inner side of the combined coagulation tank 9 in a staggered manner, and the height of the combined coagulation tank baffles 12 is smaller than that of the combined coagulation tank 9.
Further, an aeration head 22 is arranged at the bottom of the combined coagulation tank 9, and the bottom of the aeration head 22 is connected with the bottom of the side surface of the ozone generator 21 through a pipeline. The aeration head 22 is made of titanium alloy material.
Furthermore, an inverted L-shaped inclined plate sedimentation tank baffle 14 is arranged at the position, located at the water outlet 13 of the combined coagulation tank, of the inclined plate sedimentation tank 10, an inclined pipe 15 is arranged on the inner side of a cavity formed by the inclined plate sedimentation tank baffle 14, and a sludge hopper 17 is arranged at the bottom of the inclined plate sedimentation tank 10.
Further, a pressure release valve 19 and an automatic exhaust valve 20 are sequentially arranged on the tail gas pipeline, and a ball valve 26 and a glass rotameter 5 are sequentially arranged on the industrial wastewater discharge pipeline so as to control the flow rate of wastewater in the filter column to be 80-100 mL/min.
Further, the stirrer 27 comprises a medicament mixing container 23, wherein a stirring blade is arranged in the medicament mixing container 23, and the top of the stirring blade is connected with a stirring motor.
The method for pretreating industrial wastewater in advanced treatment and recycling by using the equipment comprises the following steps: after ozone O is introduced3Under the condition, adding a polyaluminium chloride PAC and a dicyandiamide formaldehyde polycondensation resin compound coagulant with the volume fraction of 5 percent into a combined coagulation tank 9 to remove most suspended substances SS, colloidal substances and partial soluble organic matters in the industrial wastewater; then the industrial wastewater enters an inclined plate sedimentation tank 10 for mud-water separation, the separated sludge is periodically cleaned and discharged through a pipeline through a sludge hopper 17 at the bottom of the inclined plate sedimentation tank 10, the supernatant flows out through an inclined plate sedimentation tank water outlet tank 16, the supernatant in the industrial wastewater passes through the micro-flocculation filter device 2 in a continuous flow mode, the hydraulic retention time of the industrial wastewater in the micro-flocculation filter device 2 is 1-2h, the industrial wastewater passes through a pipeline mixer 24 in the micro-flocculation filter device 2, polyaluminium chloride PAC with the concentration of 100mg/L is added into the pipeline mixer 24, the industrial wastewater is fully mixed with the added polyaluminium chloride PAC, then the industrial wastewater is mutually promoted by filler in a micro-flocculation filter column 25 in the micro-flocculation filter device 2 to further degrade COD, SS and chromaticity in the wastewater, the industrial wastewater is filtered by the micro-flocculation filter column 25 and then is discharged from a water outlet of the micro-flocculation filter column 25, the COD and the chroma removal rate of the discharged industrial wastewater completely meet the water inlet requirement of a double-membrane method.
Further, the preparation method of the compound coagulant comprises the following steps: dissolving PAC powder solid by using distilled water to enable the concentration of the solution to reach 6%, then diluting the dicyandiamide formaldehyde polycondensation resin viscous liquid into a solution with the concentration of 4%, slowly adding the dicyandiamide formaldehyde polycondensation resin solution into the PAC solution at the temperature of 30 ℃, controlling the volume ratio of the PAC to the dicyandiamide formaldehyde polycondensation resin solution to be 1:1, stirring the mixed solution for 60min, controlling the stirring speed to be 100 plus materials at 800r/min, standing for 36-48h to obtain the composite coagulant, wherein the mass fractions of the PAC and the dicyandiamide formaldehyde polycondensation resin in the composite coagulant are respectively 3% and 2%, and storing the cured solution in a dark place. The compound coagulant has the main function of destabilizing SS and colloidal substances in the wastewater through the actions of electrical neutralization and adsorption bridging.
Further, the ozone is generated by an ozone generator 21, the ozone enters the combined coagulation tank 9 through an aeration head 22 arranged at the bottom of the tank, and the concentration of the ozone in the combined coagulation tank 9 is 70 mg/L; and the hydraulic retention time of the industrial wastewater in the combined coagulation tank 9 is 20-30 min. The ozone generator 21 is an air type generator. Ozone has a coagulation aiding effect, and the introduction of ozone can increase oxygen-containing functional group organic matters in the wastewater, so that the oxygen-containing functional group organic matters and metal salt hydrolysis products in the compound coagulant form polymers, thereby increasing the removal of refractory organic substances; in addition, the ozone can promote the hydrolysis of the compound coagulant, so that more polymerized peptide hydrolysate is formed, the coagulation effect is improved, and the removal of soluble organic matters is improved. In addition, the gas is introduced into the combined coagulation tank 9, so that the stirring and mixing functions can be realized.
Furthermore, the micro-flocculation filter column 25 is a cylindrical continuous flow reaction device, the filter column is made of polypropylene resin material, the height is 1000mm, the diameter is 150mm, ceramsite and granular activated carbon filler are sequentially filled in the filter column from bottom to top, the granular activated carbon is coal activated carbon, the granularity of the granules is 2-4mm, and the height of the granular activated carbon filler is 600 mm.
The COD of the secondary effluent of a certain coking plant sewage treatment station is 260.2mg/L, and the chroma is 256 times. The double-membrane pretreatment technology and the device in the advanced treatment and recycling technology of industrial wastewater in the embodiment comprise a combined coagulation-precipitation device 1 and a micro-flocculation filtering device 2.
The secondary effluent of the coking wastewater is collected in a No. 1 water collecting tank 7, the industrial wastewater is lifted by a No. 1 lift pump 8 and enters a combined coagulation tank 9 through a water inlet 11 of a combined coagulation device, a composite coagulant enters through the water inlet 11 of the combined coagulation tank, the composite coagulant, ozone and the coking wastewater are fully mixed in the combined coagulation tank 9, the industrial wastewater stays in the combined coagulation tank 9 for 20-30 min and then enters an inclined plate sedimentation tank 10 from a water outlet 13 of a mixing reaction tank, and the coking wastewater stays in the inclined plate sedimentation tank 10 for 10-20 min. After the coking wastewater is precipitated, the supernatant overflows from the inclined plate sedimentation tank water outlet tank 16 and is discharged into the No. 2 lifting water tank 3 through a water outlet pipe. The top of the combined coagulation tank 9 and the inclined plate sedimentation tank 10 is provided with a cover plate 18 and a tail gas destruction device, and ozone tail gas in the reaction device is discharged into the tail gas destruction device through a pressure release valve 19 and an automatic exhaust valve 20.
The No. 2 header tank 3 and the micro-flocculation filtration device 2 are connected through a No. 2 lift pump 4, the coking wastewater is lifted to the micro-flocculation filtration device 2 through the pump, the micro-flocculation filtration device 2 is divided into a pipeline mixer 24 and a micro-flocculation filtration column 25, PAC solution with the concentration of 100mg/L is added into the pipeline mixer 24, PAC is continuously and uniformly stirred through a stirrer 27, and the PAC concentration in the medicament mixing container 23 is ensured to be 100 mg/L. The coking wastewater and PAC are fully mixed by a pipeline mixer 24 and then enter the micro-flocculation filter column 25. Coking wastewater enters from the top end of the micro-flocculation filter column 25, water is uniformly distributed through a water distribution hose 28, the coking wastewater flows out from a water outlet at the bottom of the micro-flocculation filter column 25 after coagulation filtration by PAC and granular activated carbon, and enters a filtrate collection container 6, and the residence time of industrial wastewater in the micro-flocculation filter column is 1-2 h. A ball valve 26 and a glass rotameter 5 are connected between the water outlet of the micro flocculation filtration column and the filtrate collection container 6 to control the flow rate of the wastewater in the filtration column to be 80-100 mL/min.
Example two
The COD of the secondary effluent of a certain coking plant sewage treatment station is 236.8mg/L, and the chroma is 248 times. The pretreatment device for advanced treatment and recycling of industrial wastewater in the embodiment adopts the same device as the first embodiment, and comprises a mixing reaction part, an inclined plate sedimentation part and a micro-flocculation filtration part. Wherein the combined coagulation tank 9 is not filled with ozone, and other operation parameters are consistent with those of the embodiment.
EXAMPLE III
The COD of the secondary effluent of a certain coking plant sewage treatment station is 242.5mg/L, and the chroma is 248 times. In the pretreatment device for advanced treatment and recycling of industrial wastewater of the embodiment, the coagulating sedimentation part adopts the same device as that of the embodiment I, the composite coagulant added into the combined coagulation tank 9 is PAC, the concentration is 300mg/L, and ozone is not introduced into the combined coagulation tank 9; the subsequent filtering part is changed from the micro-flocculation filtering in the first embodiment to the granular activated carbon direct filtering, and the rest of the operating parameters are consistent with those in the first embodiment.
The main indexes of the wastewater of each part in the above embodiment are shown in table 1:
TABLE 1
After the coking wastewater is subjected to biochemical treatment and combined coagulation-precipitation and micro-flocculation filtration, the COD and the chroma of the effluent are 44.8mg/L and 22 times respectively, and according to the operation experience of a double-membrane method engineering project, the effluent quality can reach the water quality index of a circulating cooling water system in the quality of municipal wastewater reclamation industrial water GB/T19923 + 2005 and the membrane pollution is greatly reduced after the wastewater is subjected to the treatment and the double-membrane method treatment.
The device and the method are suitable for pretreatment in advanced treatment and recycling of high-concentration high-chroma organic industrial wastewater.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The pretreatment equipment in the advanced treatment and recycling of industrial wastewater is characterized by comprising a combined coagulation-precipitation device, a No. 2 water collecting tank, a No. 2 lift pump, a micro-flocculation filtering device and a filtrate collecting container, wherein the combined coagulation-precipitation device is connected with one end of the micro-flocculation filtering device through the No. 2 water collecting tank and the No. 2 lift pump, and the other end of the micro-flocculation filtering device is connected with the filtrate collecting container; the combined coagulation-precipitation device comprises a No. 1 water collecting tank, a No. 1 lift pump, a combined coagulation tank, an ozone generator and an inclined plate precipitation tank, wherein the No. 1 water collecting tank is connected with a water inlet of the combined coagulation tank after passing through the No. 1 lift pump, a water outlet of the combined coagulation tank is connected with the top of the side of the combined coagulation tank of the inclined plate precipitation tank, a water outlet groove of the inclined plate precipitation tank at the top of the other side of the inclined plate precipitation tank is connected with the top of the No. 2 water collecting tank through a pipeline, cover plates are added to the tops of the combined coagulation tank and the inclined plate precipitation tank, the tops of the cover plates are connected with a tail gas destruction device through a tail gas; the micro-flocculation filtering device comprises a pipeline mixer and a micro-flocculation filtering column, one end of the pipeline mixer is connected with a 2# lifting pump, the other end of the pipeline mixer is connected with the top of the micro-flocculation filtering column through a pipeline, the bottom of the pipeline mixer is connected with a stirrer, and the bottom of the micro-flocculation filtering column is connected with the top of a filtrate collecting container through an industrial wastewater discharge pipeline.
2. The pretreatment equipment in advanced treatment and recycling of industrial wastewater according to claim 1, wherein water distribution hoses are uniformly arranged on the top cover plate of the micro flocculation filtration column, and holes are uniformly arranged on the water distribution hoses.
3. The pretreatment equipment in advanced treatment and recycling of industrial wastewater according to claim 1, wherein at least two combined coagulation tank baffles are longitudinally arranged in the combined coagulation tank, the end parts of the combined coagulation tank baffles are vertically and alternately connected with the inner side of the combined coagulation tank, and the height of the combined coagulation tank baffles is smaller than the height in the combined coagulation tank.
4. The pretreatment equipment for advanced treatment and recycling of industrial wastewater according to claim 1, wherein an aeration head is arranged at the bottom of the combined coagulation tank, and the bottom of the aeration head is connected with the bottom of the side surface of the ozone generator through a pipeline.
5. The pretreatment equipment for the advanced treatment and recycling of industrial wastewater according to claim 1, wherein an inverted L-shaped inclined plate sedimentation tank baffle is arranged at the water outlet of the combined coagulation tank in the inclined plate sedimentation tank, an inclined pipe is arranged inside a cavity formed by the inclined plate sedimentation tank baffle, and a sludge hopper is arranged at the bottom of the inclined plate sedimentation tank.
6. The pretreatment equipment in advanced treatment and recycling of industrial wastewater according to claim 1, wherein a pressure release valve and an automatic exhaust valve are sequentially arranged on the tail gas pipeline, and a ball valve and a glass rotameter are sequentially arranged on the industrial wastewater discharge pipeline.
7. A method for pre-treating industrial wastewater for advanced treatment and recycling by using the device in claims 1 to 6, which is characterized by comprising the following steps: after ozone O is introduced3Under the condition, adding a polyaluminium chloride PAC and a dicyandiamide formaldehyde polycondensation resin compound coagulant with the volume fraction of 5 percent into a combined coagulation tank to remove most suspended substances SS, colloidal substances and partial soluble organic matters in industrial wastewater; then the industrial wastewater enters an inclined plate sedimentation tank for mud-water separation, the separated sludge is periodically cleaned and discharged through a pipeline through a sludge hopper at the bottom of the inclined plate sedimentation tank, the supernatant flows out through a water outlet tank of the inclined plate sedimentation tank, the supernatant in the industrial wastewater passes through the micro-flocculation filter device in a continuous flow mode, the hydraulic retention time of the industrial wastewater in the micro-flocculation filter device is 1-2h, the industrial wastewater passes through a pipeline mixer in the micro-flocculation filter device, polyaluminium chloride PAC with the concentration of 100mg/L is added into the pipeline mixer, the industrial wastewater is fully mixed with the added polyaluminium chloride PAC, then the COD, SS and chromaticity in the wastewater are further degraded through mutual promotion with the filler in the micro-flocculation filter column in the micro-flocculation filter device, the industrial wastewater is filtered by the micro-flocculation filter column and then is discharged from a water outlet of the micro-flocculation filter column, the COD and the chroma removal rate of the discharged industrial wastewater completely meet the water inlet requirement of a double-membrane method.
8. The method for pretreating industrial wastewater in advanced treatment and recycling according to claim 7, wherein the preparation method of the compound coagulant comprises the following steps: dissolving PAC powder solid by using distilled water to enable the concentration of the solution to reach 6%, then diluting dicyandiamide formaldehyde polycondensation resin viscous liquid into a solution with the concentration of 4%, slowly adding the dicyandiamide formaldehyde polycondensation resin solution into the PAC solution at the temperature of 30 ℃, controlling the volume ratio of the PAC to the dicyandiamide formaldehyde polycondensation resin solution to be 1:1, stirring the mixed solution for 60min, controlling the stirring speed to be 100 plus materials at 800r/min, and standing for 36-48h to obtain the composite coagulant, wherein the mass fractions of the PAC and the dicyandiamide formaldehyde polycondensation resin in the composite coagulant are respectively 3% and 2%.
9. The method for pretreating industrial wastewater for advanced treatment and recycling according to claim 7, wherein the ozone is generated by an ozone generator, the ozone enters a combined coagulation tank through an aeration head arranged at the bottom of the tank, and the concentration of the ozone in the combined coagulation tank is 70 mg/L; and the hydraulic retention time of the industrial wastewater in the combined coagulation tank is 20-30 min.
10. The method for pretreating industrial wastewater for advanced treatment and recycling according to claim 7, wherein the micro-flocculation filter column is a cylindrical continuous flow reaction device, and ceramsite and granular activated carbon filler are sequentially filled in the micro-flocculation filter column from bottom to top, and the particle size of the granular activated carbon filler is 2-4 mm.
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