CN113248083A - Epichlorohydrin wastewater treatment method and treatment device thereof - Google Patents

Epichlorohydrin wastewater treatment method and treatment device thereof Download PDF

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Publication number
CN113248083A
CN113248083A CN202110608778.0A CN202110608778A CN113248083A CN 113248083 A CN113248083 A CN 113248083A CN 202110608778 A CN202110608778 A CN 202110608778A CN 113248083 A CN113248083 A CN 113248083A
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wastewater
reaction tank
tank
carbon
carbon column
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CN202110608778.0A
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CN113248083B (en
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龙兵
石爱伟
宋启航
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Kingboard Hengyang Industrial Co ltd
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Kingboard Hengyang Industrial Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • 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
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a method and a device for treating epichlorohydrin wastewater. The device comprises a reaction tank, wherein a reaction cavity is arranged in the reaction tank, a liquid inlet is formed in the side wall of the reaction tank and positioned at the upper end part of the reaction tank, a liquid outlet is formed in the side wall of the reaction tank and positioned at the lower end part of the reaction tank, and an installation frame for installing carrier activated carbon is arranged in the reaction tank; the carrier active carbon comprises a cylindrical carbon column, through holes penetrating through the carbon column are uniformly distributed in the carbon column along the axial direction of the carbon column, and cavities penetrating through the through holes are uniformly distributed in the carbon column. Through above-mentioned structure for through-hole and cavity can increase the adsorption area of charcoal post better, can adsorb more catalyst on making the charcoal post, thereby make its effect of handling sewage better.

Description

Epichlorohydrin wastewater treatment method and treatment device thereof
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method and a device for treating epichlorohydrin wastewater.
Background
Epichlorohydrin is an important organic chemical raw material and a fine chemical product, is a large variety of products in propylene derivatives, and is mainly applied to synthesis of glycerin, epoxy resin, chlorohydrin rubber, nitroglycerin explosive and the like.
At present, the production methods of epichlorohydrin mainly comprise a propylene high-temperature chlorination method and an acrylic acetate method, and as the capacity of epichlorohydrin is increased, more and more wastewater is generated in the production process, the wastewater contains a large amount of pollutants, the components are complex, and the treatment of the wastewater is difficult. With the deepening of the concept of comprehensive utilization of waste, people are forced to propose a method for treating wastewater produced by epoxy chloropropane, so that the wastewater is fully utilized.
Disclosure of Invention
Aiming at certain defect or defects in the prior art, the invention provides a method and a device for treating epichlorohydrin wastewater
In order to solve the above technical problems, the present invention is solved by the following technical solutions.
A method for treating epichlorohydrin wastewater comprises the following steps:
step one, wastewater pretreatment
The step is used for treating the original wastewater to further obtain CaSO4Solid crystals and pretreated wastewater;
step two, wastewater treatment
The step is used for treating the pretreated wastewater so as to degrade organic pollutants.
Preferably, step one specifically comprises the steps of,
s1, introducing the original wastewater into a primary sedimentation tank, and adding a polymeric flocculant for sedimentation; after settling is finished, conveying the upper layer of clear water into a neutralization tank, adjusting the pH of the wastewater to 6-7 by using hydrochloric acid, and conveying the lower layer of sludge into a slurry tank for caching and then into a filter press for filter pressing;
s2, introducing the wastewater in the neutralization tank in the S1 into CaSO4In the formation reaction tank, to CaSO4Adding solid Na into a reaction tank2SO4To generate CaSO4Solid crystals;
s3, adding CaSO in S24Introducing the wastewater in the generation reaction tank into a secondary primary sedimentation tank, and adding a polymeric flocculant for sedimentation; after the sedimentation is finished, delivering the supernatant to a hydrolysis tank for hydrolysis, and delivering the sludge of the lower layer to a filter press for filter pressing after being buffered by a buffer tank;
and S4, pumping the wastewater in the hydrolysis tank in the S3 into a cooling tower, cooling, sending the wastewater into a cyclization water tank, adjusting the pH of the cyclization water to 6-8 by hydrochloric acid, and sending the wastewater to activated sludge for biochemical treatment.
Preferably, the second step specifically comprises the following steps of S5, introducing the pretreated wastewater after pretreatment into a bioreactor, adding carrier activated carbon into the bioreactor, and degrading organic pollutants in the wastewater;
s6, treating the wastewater treated by the S5 by using a halophilic bacteria and SBR combined process;
s7, introducing the wastewater treated by the S6 into a filter tank for filtering, removing suspended particles in the wastewater, and introducing into a cartridge filter for removing the suspended particles in the wastewater;
s8, treating the wastewater treated by the S7 by utilizing an advanced oxidation treatment process, adjusting the pH value of the wastewater to be acidic, and adding NaClO3Deep oxidation is carried out on the wastewater;
s9, feeding the wastewater treated by the S8 into an underground salt well for halogenating.
The wastewater produced by the epichlorohydrin production is effectively treated by the modes of wastewater pretreatment and wastewater treatment after pretreatment, so that Ca in the wastewater is effectively treated2+、Mg2+The elements are effectively recycled, and meanwhile, organic pollutants in the wastewater can be degraded and suspended particles are filtered, so that the wastewater is better treated, and the standard discharge of the wastewater is guaranteed.
Preferably, the solid obtained by pressure filtration in the filter press in S3 is mixed with the dry powder of aluminosilicate to produce a by-product, which is fully utilized.
Preferably, the filter press is a plate and frame filter press, which effectively filter presses the sludge.
The invention also provides an epichlorohydrin wastewater treatment device which is used for realizing any one of the epichlorohydrin wastewater treatment methods, and the epichlorohydrin wastewater treatment device comprises a wastewater pretreatment unit and a wastewater treatment unit, wherein the wastewater pretreatment unit is used for realizing the step one, and the wastewater treatment unit is used for realizing the step two.
Preferably, the wastewater treatment unit comprises a reaction tank, a reaction cavity is arranged in the reaction tank, a liquid inlet is formed in the side wall of the reaction tank and positioned at the upper end part of the reaction tank, a liquid outlet is formed in the side wall of the reaction tank and positioned at the lower end part of the reaction tank, and an installation frame for installing carrier activated carbon is arranged in the reaction tank; the carrier active carbon comprises a cylindrical carbon column, through holes penetrating through the carbon column are uniformly distributed in the carbon column along the axial direction of the carbon column, and cavities penetrating through the through holes are uniformly distributed in the carbon column.
Through the structure of the invention, the through hole and the cavity can better increase the adsorption area of the carbon column, so that more catalysts can be adsorbed on the carbon column, and the sewage treatment effect of the carbon column is better.
Preferably, the mounting frame comprises a rotating shaft which is rotatably arranged in the reaction cavity, the rotating shaft is provided with a long cylinder which is arranged along the vertical direction and has two open ends through a connecting rod, the carrier activated carbon is stacked in the long cylinder, the long cylinder is uniformly distributed with a plurality of leakage holes along the circumferential direction of the rotating shaft; the upper end face of the reaction tank is provided with a charging opening corresponding to the long cylinder, the lower end face of the reaction tank is provided with a discharge opening corresponding to the long cylinder, and the charging opening and the discharge opening are both provided with plugs.
Through the structure of the invention, the long cylinder rotates to stir the wastewater, so that the wastewater can enter the long cylinder and be better degraded by the carrier activated carbon in the long cylinder, and the treatment effect of the wastewater is better.
Preferably, the outer side surface of the carbon column stacked in the long cylinder is provided with a notch communicated with the corresponding cavity, and the notch is arranged along the tangential direction of the rotating track of the long cylinder.
Through the structure of the invention, the waste water can enter the cavity from the notch and flow out from the two ends of the long cylinder to form turbulent flow, so that the waste water is better degraded.
Preferably, the inner side wall of the long cylinder is provided with a sliding block along the up-down direction, the outer side surface of the carbon column is provided with a sliding groove matched with the sliding block, the carbon column is preferably limited, and the notch is ensured to be arranged along the tangential direction of the motion track of the long cylinder all the time.
Preferably, one end face of each carbon column is provided with a socket slot, and the other end face of each carbon column is provided with a socket column inserted into the adjacent socket slot, so that the carbon columns are connected together in an inserted manner to form a whole, and the turbulent flow effect is better.
Preferably, a motor for driving the rotating shaft to rotate is arranged on the upper end face of the reaction tank, and the rotating shaft is preferably rotated.
Preferably, the plug comprises a threaded portion which is threaded into the charging opening or the discharging opening, and the plug is preferably mounted and dismounted in the charging opening or the discharging opening.
Drawings
FIG. 1 is a process flow diagram of pretreatment of wastewater in example 1;
FIG. 2 is a process flow diagram of wastewater treatment in example 1;
FIG. 3 is a schematic view of a reaction tank in example 1;
FIG. 4 is a schematic sectional view of a reaction tank in example 1;
FIG. 5 is a schematic illustration of the insertion of the carbon column of example 1;
FIG. 6 is a schematic bottom view of the carbon column in example 1;
fig. 7 is a schematic view of a mount in embodiment 1;
FIG. 8 is a schematic view of a stopper in example 1;
fig. 9 is a schematic view of a mounting block in embodiment 1.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention and not limiting.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a method for treating epichlorohydrin wastewater, which comprises the following steps:
step one, wastewater pretreatment, which is used for treating original wastewater to obtain CaSO4Solid crystals and pretreated wastewater.
And step two, wastewater treatment, which is used for treating the pretreated wastewater so as to degrade organic pollutants.
The first step specifically comprises the following steps:
s1, introducing the wastewater (namely the original wastewater) produced by epoxy chloropropane into a primary sedimentation tank, and adding a polymeric flocculant to improve the solid settling separation effect; after the sedimentation is finished, conveying the supernatant water to a neutralization tank, adjusting the pH of the wastewater to 6-7 by hydrochloric acid to dissolve Ca (OH)2、Mg(OH)2、CaCO3Dissolving to ensure the subsequent generation of CaSO4Purity and basicity of (d); the sludge at the lower layer is cached in a slurry tank and then sent to a filter press for filter pressing, and solid lime waste residue containing 60 to 70 percent of water is discharged;
s2, introducing the wastewater in the neutralization tank in the S1 into CaSO4In the formation reaction tank, to CaSO4Adding solid Na into a reaction tank2SO4Adding CaCl in the wastewater2Conversion to NaCl and generation of CaSO4Solid crystals;
s3, adding CaSO in S24Introducing the wastewater of the solid suspended matters into a secondary primary sedimentation tank, and adding a polymeric flocculant to ensure that CaSO in the wastewater is4Separating and settling; after the sedimentation is finished, the supernatant is conveyed to a hydrolysis tank for hydrolysis, so that most of organic chloride in the supernatant is hydrolyzed into glycerol; the sludge at the lower layer is buffered by a buffer tank and then sent into a filter press for filter pressing to obtain CaSO with the water content of 30 percent4A solid;
s4, pumping the hydrolyzed wastewater in the hydrolysis tank in the S3 into a cooling tower, cooling the temperature of the wastewater to 40 ℃, sending the wastewater into a cyclization water tank, adjusting the pH value of the cyclization water to 6-8 by hydrochloric acid (the obtained wastewater is the pretreated wastewater), and sending the wastewater to activated sludge biochemical treatment (namely, entering a wastewater treatment step);
the second step specifically comprises the following steps:
s5, introducing the pretreated wastewater into a bioreactor, adding carrier activated carbon into the bioreactor, degrading organic pollutants in the wastewater by utilizing the adsorption capacity of the activated carbon and the microbial oxidation capacity fixed on the surface of the activated carbon in a form of a biological membrane, improving the degradation rate of the pollutants and the volume index of sludge, and reducing the concentration of organic matters and suspended matters in stored water;
s6, treating the wastewater treated by the S5 by using a halophilic bacteria and SBR combined process, absorbing and degrading sodium ions in the wastewater by using halophilic bacteria, and degrading COD in the wastewater by using an SBR process;
s7, introducing the wastewater treated by the S6 into a filter tank for filtering, removing a large amount of suspended particles in the wastewater, and introducing the wastewater into a cartridge filter for removing a small amount of suspended particles in the wastewater;
s8, treating the wastewater treated by the S7 by utilizing an advanced oxidation treatment process, adjusting the pH value of the wastewater to be acidic, and adding NaClO3Deeply oxidizing the wastewater, and deeply oxidizing the wastewater again by utilizing the strong oxidizing property under the acid washing condition to ensure that the COD of the effluent reaches the standard;
s9, feeding the wastewater treated by the S8 into an underground salt well for halogenating.
In this example, the solid obtained by pressure filtration in the filter press in S3 was mixed with a dry powder of a silicoaluminate to prepare a by-product.
In this embodiment, the filter press is a plate and frame filter press, and preferably, the sludge is filter-pressed.
In addition, the embodiment also provides an epoxy chloropropane wastewater treatment device, which can preferably realize the method in the embodiment.
An epichlorohydrin wastewater treatment device in this embodiment can include a wastewater pretreatment unit and a wastewater treatment unit, the wastewater pretreatment unit is used for implementing the first step in this embodiment, and the wastewater treatment unit is used for implementing the second step in this embodiment.
It will be appreciated that the wastewater pretreatment unit can comprise, for example, a primary settling tank, a neutralization tank, a filter press, CaSO4The production reaction tank, the secondary primary sedimentation tank, the hydrolysis tank, the cooling tower, the cyclized water tank and the like can be preferably realized from step S1 to step S4 in the first step.
Further, the wastewater treatment unit can include devices such as a bioreactor, an SBR system (including the reaction tank in fig. 2), a filter tank, a cartridge filter, a deep oxidation system (including the oxidation tank in fig. 2), and the like, so that steps S5 to S9 in step two can be preferably implemented.
In addition, it should be understood by those skilled in the art that the SBR system in the wastewater treatment unit is a mature device and process, and the solution in this embodiment does not involve the improvement, and thus is not described in detail. The halophilic bacteria and SBR combined process in the embodiment means that the halophilic bacteria and SBR processes are sequentially or simultaneously adopted to treat target wastewater.
In addition, the deep oxidation system can be carried out in the oxidation pond, and the deep oxidation refers to that the target wastewater can be aerated and added with NaClO sequentially or simultaneously3And (6) processing.
Referring to fig. 3, 4, and 5, the bioreactor in this embodiment includes a reaction tank 100, a reaction cavity 211 is disposed in the reaction tank 100, a liquid inlet 101 is disposed on a side wall of the reaction tank 100 and located at an upper end, wastewater is injected into the reaction tank 100 through the liquid inlet 101, a liquid outlet 102 is disposed on a side wall of the reaction tank 100 and located at a lower end, so that the wastewater processed by the reaction tank 100 can be discharged, and an installation frame 220 for installing carrier activated carbon is disposed in the reaction tank 100; wherein, the carrier activated carbon is utilized to enable agents such as a catalyst and the like to be placed on the carrier activated carbon, so that the agents degrade organic pollutants in the wastewater in the reaction tank 100 by utilizing the catalysis of the catalyst and the adsorbability of the activated carbon;
the carrier activated carbon comprises a cylindrical carbon column 300, through holes 301 penetrating through the carbon column 300 are uniformly distributed in the carbon column 300 along the axial direction of the carbon column 300, the catalyst is arranged in the through holes 301 through adsorption, and cavities 302 penetrating through the through holes 301 are uniformly distributed in the carbon column 300, wherein the adsorption area of the carbon column 300 is increased through the arrangement of the through holes 301 and the cavities 302, so that the carbon column 300 can adsorb more medicaments such as the catalyst and the like, and the wastewater degradation effect is better;
the mounting rack 220 comprises a rotating shaft 221 which is rotatably arranged in the reaction cavity 211, the rotating shaft 221 is provided with a long cylinder 223 which is arranged along the vertical direction and has two open ends through a connecting rod 222, the carrier activated carbon is stacked in the long cylinder 223, the long cylinder 223 is uniformly arranged along the circumferential direction of the rotating shaft 221, and the long cylinder 223 is provided with a leakage hole; a feed inlet 212 is arranged on the upper end face of the reaction tank 100 corresponding to the long cylinder 223, a discharge outlet 213 is arranged on the lower end face of the reaction tank 100 corresponding to the long cylinder 223, and plugs 120 are arranged on the feed inlet 212 and the discharge outlet 213;
through the structure in the embodiment, when the long cylinder 223 is opposite to the feed inlet 212, the carbon columns 300 can be sequentially added into the long cylinder 223 through the feed inlet 212, so that the carbon columns 300 are stacked in the long cylinder 223, and the wastewater in the reaction cavity 211 can enter the long cylinder 223 to be catalytically degraded by the carbon columns 300 due to the leak holes arranged on the long cylinder 223; when the long cylinder 300 is opposite to the discharge hole 213, the carbon column 300 in the long cylinder 223 can be discharged, so that the carbon column 300 can be conveniently replaced; wherein, through the arrangement of the plug 213, the opening and closing of the feed inlet 212 and the discharge outlet 213 are preferably realized; referring to fig. 8, the plug 120 includes a threaded portion 611 having threads extending into the material inlet 212 or the material outlet 213, so that the plug 120 can be easily assembled and disassembled on the material inlet 212 or the material outlet 213, and a lifting block 612 is disposed on the plug 120, so that a user can conveniently twist the plug 120 to rotate.
In this embodiment, the outer side surface of the carbon column 300 stacked in the long cylinder 223 is provided with a notch 303 communicated with the corresponding cavity 302, and the notch 303 is arranged along the tangential direction of the rotation track of the long cylinder 223;
through the structure in this embodiment, the rotating shaft 221 drives the long cylinder 223 to rotate in the reaction cavity 211, so that the wastewater in the reaction cavity 211 is stirred, the carbon column 300 is convenient to degrade the wastewater, meanwhile, the long cylinder 223 rotates in the process, the wastewater in the reaction cavity 211 can be poured into the cavity 302 through the notch 303 and flows out through the through hole 301, the contact area between the wastewater and the carbon column 300 is preferably increased, so that the degradation effect of the carrier activated carbon on the wastewater is better, meanwhile, the carbon column 300 forms a whole because the carbon column 300 is stacked in the long cylinder 223, so that the wastewater entering the cavity 302 finally flows out from the two ends of the long cylinder 223, and the wastewater in the reaction cavity 211 forms turbulent flow entering the cavity 302 through the notch 303 and flowing out from the two ends of the long cylinder 223, so that the wastewater is better degraded.
Further, it is understood that a plurality of (5 in the present embodiment) partition units, at each of which a plurality of through holes 301 are provided, can be formed at intervals in the carbon column 300 through the cavities 302. Wherein, in order to achieve better processing effect, the through holes 301 at each partition unit can be arranged in a staggered manner with the through holes 301 at the adjacent partition units. The staggered arrangement means that there are no through holes 301 with overlapped axes between adjacent partition units. Based on the arrangement, after the target wastewater enters the carbon column 300 from the notch 303, a large turbulent flow can be formed in the carbon column 300, so that the target wastewater can be better in contact with the carbon column 300 more sufficiently, and the treatment effect can be better improved.
Referring to fig. 7, the inner sidewall of the long tube 223 is provided with a sliding block 511 along the vertical direction, and the outer sidewall of the charcoal column 300 is provided with a sliding groove 304 matching with the sliding block 511;
through the structure in the embodiment, the sliding block 511 is clamped in the sliding groove 304 to limit the carbon column 300, so that the carbon column 300 can only slide into the long cylinder 223, and meanwhile, the carbon column 300 is limited in the circumferential direction of the long cylinder 223, and the notch 303 is ensured to be arranged along the tangential direction of the movement track of the long cylinder 223 all the time.
Referring to fig. 6, a socket 411 is disposed on one end of the carbon column 300, and a socket 305 inserted into the adjacent socket 411 is disposed on the other end of the carbon column 300, so that the socket 305 is inserted into the socket 411 to form the carbon column 300 in the long tube 223 into a whole, thereby providing better turbulent flow effect.
Referring to fig. 7 and 9, the outer side wall of the long cylinder 223 and the upper and lower ends thereof are provided with a limiting mechanism 520 for limiting the carbon column 300 in the long cylinder 223, so as to prevent the carbon columns 300 at the two ends of the long cylinder 223 from extending out of the long cylinder 223 and rubbing with the side wall of the reaction chamber 211, which may cause abrasion of the carbon columns 300;
limiting mechanism 520 includes the relative installation piece 700 that sets up, be equipped with the spring installation cavity 701 towards in the long section of thick bamboo 223 in the installation piece 700, be equipped with the spacing groove 702 of intercommunication installation cavity 701 along the length direction of installation cavity 701 on the lateral wall of installation piece 700, be equipped with the ejector pad 720 that one end stretches into in the long section of thick bamboo 223 through spring 710 in the spring installation cavity 701, be equipped with the reference column 721 that stretches out spacing groove 702 on the ejector pad 720, the ejector pad 720 stretches into and is equipped with on the end wall in the long section of thick bamboo 223 and be used for with carbon column 300 matched with inclined plane 722.
Through the structure in the embodiment, the spring 710 always pushes the push block 720 to extend into the long tube 223, so that the push block can limit the carbon column 300 in the long tube 223, and the carbon column 300 is fixed in the long tube 223, wherein the positioning column 721 extends out of the limiting groove 702, so that the push block 720 is limited, and the spring 710 is prevented from pushing the push block to fully extend into the long tube 223; through the arrangement of the inclined plane 722, when an operator presses the carbon column 300 to move downwards in the long cylinder 223, the carbon column 300 can extrude the inclined plane 722 to push the push block 720 to retract into the spring installation cavity 701, so that the limit of the carbon column 300 is released, and the carbon column 300 can be discharged; the lower end surface of the upper pushing block 720 is also provided with an inclined surface 722, so that the springs 710 at the upper and lower ends push the pushing block 720 to enable the carbon column 300 between the pushing block 720 to be inserted more tightly, and the turbulent flow effect is better.
In this embodiment, the end surface of the mounting block 700 is provided with a mounting portion 703, and the mounting portion 703 is fixed to the long tube 223 by a bolt, so that the limit mechanism 520 is preferably attached to and detached from the long tube 223.
The reaction tank 100 in this embodiment can include the following operations in actual operation:
1. addition of carbon column 300
The plug 120 on the upper side of the reaction tank 100 is opened, the long cylinder 223 corresponds to the feed inlet 212, the chute 304 on the carbon column 300 corresponds to the sliding block 511 on the long cylinder 223, the carbon column 300 is pressed into the long cylinder 223 through the feed inlet 212, the carbon column 300 can enable the push block 720 on the upper side to retract into the spring mounting cavity 701, the carbon column 300 is added into the long cylinder 223, when a proper amount of carbon columns 300 are added into the long cylinder 223, the push blocks 720 on the upper side and the lower side push the carbon columns 300 to be mutually inserted under the action of the spring 710, and preferably, an integral body is formed, so that the waste water can be conveniently treated.
2. Replacement of the carbon column 300
The plugs 120 on the upper and lower sides of the reaction tank 100 are opened, new carbon columns 300 are added from the feed inlet 212, the new carbon columns 300 press the carbon columns 300 to be replaced in the long cylinder 223, the lowest carbon column 300 to be replaced forces the push block 720 on the lower side to retract into the spring installation cavity 701, and the carbon columns 300 to be replaced in the long cylinder 223 are sequentially discharged from the discharge outlet 213.
As can be seen from the above, the scheme provided in the present embodiment can preferably realize the addition of the carrier activated carbon into the reaction tank 100 and the discharge of the carrier activated carbon after the reaction.
In addition, in the actual operation of the reaction tank 100 in this embodiment, wastewater can enter the reaction tank 100 from the liquid inlet 101, wherein the motor 110 drives the rotating shaft 221 to rotate to drive the long cylinder 223 to rotate in the reaction tank 100, so as to drive the wastewater to flow in the circumferential direction of the rotating shaft 221 in the reaction tank 100, and meanwhile, in the rotating process, the wastewater can enter the cavity 302 through the notch 303 and flow out through the through holes 301 of the carbon columns 300 located at the two ends of the long cylinder 223, so that the wastewater can flow in the axial direction of the rotating shaft 221, and meanwhile, the through holes 301 in the carbon columns 300 are not correspondingly arranged, so that the degree of turbulence of the wastewater flowing in the carbon columns 300 can be preferably increased; in this embodiment, the through hole 301 and the cavity 302 of the carbon column 300 are adsorbed with a reagent such as a catalyst, so that the wastewater flowing through the carbon column 300 can be treated, such as organic matter degradation, and thus organic pollutants in the wastewater can be removed. In particular, in the present embodiment, the surface area of the carbon column 300 in a unit volume is increased, so that the adsorption performance of the carbon column 300 can be preferably improved, and the carbon column can preferably adsorb corresponding carriers (such as catalysts and other agents); in addition, due to the structure of the long cylinder 223 and the carbon column 300, when the target wastewater is treated, the effective contact between the target wastewater and the carbon column 300 can be preferably improved, so that the treatment efficiency can be preferably improved.
The method for treating the epichlorohydrin wastewater can effectively treat the wastewater to ensure that Ca in the wastewater is contained2+The organic pollutants in the wastewater can be effectively degraded, so that the wastewater can be effectively treated and can be discharged after reaching the standard.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims (10)

1. A method for treating epichlorohydrin wastewater comprises the following steps:
step one, wastewater pretreatment
The step is used for treating the original wastewater to further obtain CaSO4Solid crystals and pretreated wastewater;
step two, wastewater treatment
The step is used for treating the pretreated wastewater so as to degrade organic pollutants.
2. The method for treating epichlorohydrin wastewater according to claim 1, wherein: the first step specifically comprises the following steps of,
s1, introducing the original wastewater into a primary sedimentation tank, and adding a polymeric flocculant for sedimentation; after settling is finished, conveying the upper layer of clear water into a neutralization tank, adjusting the pH of the wastewater to 6-7 by using hydrochloric acid, and conveying the lower layer of sludge into a slurry tank for caching and then into a filter press for filter pressing;
s2, introducing the wastewater in the neutralization tank in the S1 into CaSO4In the formation reaction tank, to CaSO4Adding solid Na into a reaction tank2SO4To generate CaSO4Solid crystals;
s3, adding CaSO in S24Introducing the wastewater in the generation reaction tank into a secondary primary sedimentation tank, and adding a polymeric flocculant for sedimentation; after the sedimentation is finished, delivering the supernatant to a hydrolysis tank for hydrolysis, and delivering the sludge of the lower layer to a filter press for filter pressing after being buffered by a buffer tank;
and S4, pumping the wastewater in the hydrolysis tank in the S3 into a cooling tower, cooling, sending the wastewater into a cyclization water tank, adjusting the pH of the cyclization water to 6-8 by hydrochloric acid, and sending the wastewater to activated sludge for biochemical treatment.
3. The method for treating epichlorohydrin wastewater according to claim 2, wherein: the second step specifically comprises the following steps of,
s5, introducing the pretreated wastewater subjected to pretreatment into a bioreactor, and adding carrier activated carbon into the bioreactor to degrade organic pollutants in the wastewater;
s6, treating the wastewater treated by the S5 by using a halophilic bacteria and SBR combined process;
s7, introducing the wastewater treated by the S6 into a filter tank for filtering, removing suspended particles in the wastewater, and introducing into a cartridge filter for removing the suspended particles in the wastewater;
s8, treating the wastewater treated by the S7 by utilizing an advanced oxidation treatment process, adjusting the pH value of the wastewater to be acidic, and adding NaClO3Deep oxidation is carried out on the wastewater;
s9, feeding the wastewater treated by the S8 into an underground salt well for halogenating.
4. An epichlorohydrin wastewater treatment apparatus for realizing the epichlorohydrin wastewater treatment method according to any one of claims 1 to 3, characterized in that: the device comprises a wastewater pretreatment unit and a wastewater treatment unit, wherein the wastewater pretreatment unit is used for realizing the first step, and the wastewater treatment unit is used for realizing the second step.
5. The epichlorohydrin wastewater treatment apparatus of claim 4, wherein: the wastewater treatment unit comprises a reaction tank (100), a reaction cavity (211) is arranged in the reaction tank (100), a liquid inlet (101) is formed in the side wall of the reaction tank (100) and positioned at the upper end part, a liquid outlet (102) is formed in the side wall of the reaction tank (100) and positioned at the lower end part, and an installation frame (220) for installing carrier activated carbon is arranged in the reaction tank (100); the carrier active carbon comprises a cylindrical carbon column (300), through holes (301) penetrating through the carbon column (300) are evenly distributed in the carbon column (300) along the axial direction of the carbon column (300), and cavities (302) penetrating through the through holes (301) are evenly distributed in the carbon column (300).
6. The epichlorohydrin wastewater treatment apparatus of claim 5, wherein: the mounting rack (220) comprises a rotating shaft (221) which is rotatably arranged in the reaction cavity (211), the rotating shaft (221) is provided with a long cylinder (223) which is arranged along the vertical direction and has two open ends through a connecting rod (222), the carrier activated carbon is stacked in the long cylinder (223), the long cylinder (223) is uniformly distributed with a plurality of holes along the circumferential direction of the rotating shaft (221), and the long cylinder (223) is provided with a leakage hole; the upper end face of the reaction tank (100) is provided with a feed inlet (212) corresponding to the long cylinder (223), the lower end face of the reaction tank (100) is provided with a discharge outlet (213) corresponding to the long cylinder (223), and the feed inlet (212) and the discharge outlet (213) are both provided with plugs (120).
7. The epichlorohydrin wastewater treatment apparatus of claim 6, wherein: notches (303) communicated with the corresponding cavities (302) are arranged on the outer side surface of the carbon columns (300) stacked in the long cylinder (223), and the notches (303) are arranged along the tangential direction of the rotating track of the long cylinder (223).
8. The epichlorohydrin wastewater treatment apparatus of claim 7, wherein: the inner side wall of the long cylinder (223) is provided with a sliding block (511) along the vertical direction, and the outer side surface of the carbon column (300) is provided with a sliding groove (304) matched with the sliding block (511).
9. The epichlorohydrin wastewater treatment apparatus of claim 7, wherein: one end face of the carbon column (300) is provided with a socket slot (411), and the other end face of the carbon column (300) is provided with a socket column (305) inserted into the adjacent socket slot (411).
10. The epichlorohydrin wastewater treatment apparatus of claim 6, wherein: the upper end surface of the reaction tank (100) is provided with a motor (110) for driving the rotating shaft (221) to rotate.
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