CN219429858U - Coking wastewater and comprehensive wastewater combined treatment device - Google Patents

Abstract

The utility model provides a coking wastewater and comprehensive wastewater combined treatment device, which comprises: a coking pretreatment unit for obtaining coking pretreatment concentrated water and coking pretreatment produced water; a comprehensive pretreatment unit for obtaining comprehensive pretreatment concentrated water and comprehensive pretreatment produced water; the first ozone catalytic oxidation tower is used for mixing the coking pretreatment concentrated water and the comprehensive pretreatment concentrated water and then carrying out ozone catalytic oxidation treatment to obtain primary combined concentrated water and combined degradation products; the secondary treatment unit is used for obtaining secondary combined concentrated water, secondary combined produced water and primary combined filtered concentrated water; a first evaporation crystallization tower for obtaining a first solid substance; and carrying out solid-liquid separation and reverse osmosis treatment on the primary combined concentrated water to obtain secondary combined concentrated water, secondary combined produced water and primary combined filtered concentrated water. The utility model achieves the purposes of reducing the occupied area and the equipment investment and the operation cost by the combined treatment of the coking wastewater and the comprehensive wastewater.

Description

Coking wastewater and comprehensive wastewater combined treatment device

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a coking wastewater and comprehensive wastewater combined treatment device.

Background

Today iron and steel enterprises are typically large households for energy, water and pollution. The coking wastewater is wastewater generated in the processes of coal coking, gas purification and coking product recovery. The coking wastewater has complex components, contains high-concentration ammonia nitrogen and various high-toxicity organic pollutants such as phenols, polycyclic aromatic hydrocarbon and the like, and can be discharged after the treated wastewater reaches the emission standard of pollutants in coking chemistry industry (GB 16171-2012). The comprehensive wastewater consists of sewage of a circulating water system, treated external drainage reaching the standard, a small amount of process accident water, rainwater and domestic sewage, wherein the sewage of the circulating water system accounts for more than 95 percent. The comprehensive wastewater mainly contains pollutants such as activated sludge, organic pollutants, oils, inorganic salts and the like, the water quality and the water quantity of the comprehensive wastewater are influenced by the production period, and the fluctuation range is large. The steel combined enterprises are taken as water households in China, and the implementation of zero wastewater discharge is a trend.

In the prior art, two independent treatment systems are mostly adopted for coking wastewater and comprehensive wastewater, and the technical problems of large occupied area, high equipment investment, high operation cost and the like exist. Therefore, how to provide a wastewater treatment device capable of realizing the combined treatment of coking wastewater and comprehensive wastewater is a technical problem which needs to be solved by the person skilled in the art.

Disclosure of Invention

The utility model aims to provide a coking wastewater and comprehensive wastewater combined treatment device, which solves the problems of large occupied area, high equipment investment and high operation cost caused by two independent treatment systems adopted for coking wastewater and comprehensive wastewater in the prior art.

In order to solve the technical problems, the utility model provides a coking wastewater and comprehensive wastewater combined treatment device, which comprises:

the coking pretreatment unit is used for carrying out solid-liquid separation and reverse osmosis treatment on the coking wastewater to obtain coking pretreatment concentrated water and coking pretreatment produced water;

the comprehensive pretreatment unit is used for sequentially carrying out primary solid-liquid separation, primary reverse osmosis treatment, ozone catalytic oxidation treatment, secondary solid-liquid separation and secondary reverse osmosis treatment on the comprehensive wastewater to obtain comprehensive pretreatment concentrated water and comprehensive pretreatment produced water;

the first ozone catalytic oxidation tower is used for mixing the coking pretreatment concentrated water and the comprehensive pretreatment concentrated water and then carrying out ozone catalytic oxidation treatment to obtain primary combined concentrated water and combined degradation products;

the secondary treatment unit is used for carrying out solid-liquid separation and reverse osmosis treatment on the primary combined concentrated water to obtain secondary combined concentrated water, secondary combined produced water and primary combined filtered concentrated water;

and the first evaporation crystallization tower is used for carrying out evaporation crystallization treatment on the second-stage combined concentrated water to obtain a first solid substance.

Preferably, the apparatus further comprises:

and the purification reverse osmosis equipment is used for purifying and filtering the coking pretreatment produced water to obtain the produced water reaching the standard.

Preferably, the apparatus further comprises;

and the tertiary treatment unit is used for carrying out ozone catalytic oxidation treatment on the primary combined filtered concentrated water to obtain a secondary degradation product and secondary combined catalytic concentrated water, and carrying out evaporative crystallization treatment on the secondary combined catalytic concentrated water to obtain a second solid substance.

Preferably, the coking pretreatment unit comprises:

the coking pretreatment filtering module is used for filtering after coagulating sedimentation treatment of coking wastewater to obtain flocculating sedimentation and coking filtering concentrated water;

and the reverse osmosis equipment is used for carrying out reverse osmosis treatment on the coking filtration concentrated water to obtain coking pretreatment concentrated water and coking pretreatment produced water.

Preferably, the integrated pretreatment unit comprises:

the comprehensive pretreatment filter module is used for carrying out primary solid-liquid separation on the comprehensive wastewater sequentially through coagulating sedimentation and ultrafiltration steps, separating flocculating sedimentation and wastewater, and carrying out primary reverse osmosis treatment on the wastewater after the solid-liquid separation to obtain standard produced water and primary comprehensive concentrated water;

the second ozone catalytic oxidation tower is used for carrying out ozone catalytic oxidation treatment on the first-stage comprehensive concentrated water to obtain first-stage degradation products and comprehensive catalytic concentrated water;

the comprehensive pretreatment filter equipment is used for sequentially carrying out active carbon adsorption and ultrafiltration treatment on the comprehensive catalytic concentrated water and carrying out secondary solid-liquid separation to obtain the standard produced water and the comprehensive pretreatment concentrated water.

Preferably, the secondary processing unit includes:

the primary filtering equipment is used for sequentially carrying out active carbon adsorption, ultrafiltration and nanofiltration treatment on the primary combined concentrated water to carry out solid-liquid separation so as to obtain primary combined filtered concentrated water and primary combined filtered produced water;

the high-pressure reverse osmosis equipment is used for carrying out high-pressure reverse osmosis treatment on the primary combined filtered produced water to obtain secondary combined concentrated water and secondary combined produced water.

Preferably, the tertiary treatment unit includes:

and the third ozone catalytic oxidation tower is used for carrying out ozone catalytic oxidation treatment on the first-stage combined filtered concentrated water to obtain a second-stage degradation product and second-stage combined catalytic concentrated water.

And the second evaporation crystallization tower is used for carrying out evaporation crystallization treatment on the two-stage combined catalytic concentrated water to obtain a second solid substance.

Preferably, the secondary processing unit further comprises:

the fluorine and silicon removing device is arranged between the primary filtering device and the evaporation crystallization tower and is used for carrying out fluorine and silicon removing treatment on the primary combined filtering produced water.

Preferably, the coking pretreatment unit further comprises:

and the resin softener is used for carrying out resin softening treatment on the coking and filtering concentrated water.

Preferably, the tertiary treatment unit further comprises:

the high-pressure nanofiltration equipment is arranged between the third ozone catalytic oxidation tower and the secondary treatment unit and is used for carrying out high-pressure nanofiltration treatment on the primary combined filtered concentrated water.

Compared with the prior art, the coking wastewater and comprehensive wastewater combined treatment device has the following advantages:

firstly, carrying out solid-liquid separation and reverse osmosis treatment on coking wastewater to obtain coking pretreatment concentrated water and coking pretreatment produced water; sequentially carrying out solid-liquid separation, primary reverse osmosis treatment, ozone catalytic oxidation treatment, secondary solid-liquid separation and secondary reverse osmosis treatment on the comprehensive wastewater to obtain comprehensive pretreatment concentrated water and comprehensive pretreatment produced water; then mixing the obtained coking pretreatment concentrated water and comprehensive pretreatment concentrated water, and performing ozone catalytic oxidation, solid-liquid separation, reverse osmosis and evaporative crystallization treatment to obtain a first solid substance and standard-reaching produced water, wherein the first solid substance and the standard-reaching produced water can be recycled, so that the aim of combined treatment of coking wastewater and comprehensive wastewater is fulfilled, and the aims of reducing the occupied area and reducing the equipment investment and the running cost are fulfilled;

secondly, after the coking wastewater and the comprehensive wastewater are treated, the recyclable standard-reaching produced water, the first fixed substances and the second solid substances are finally obtained, the purpose of zero discharge of the combined treatment of the coking wastewater and the comprehensive wastewater is realized, the environmental protection approval problem is solved, a green channel is opened up for the new increase capacity of enterprises, the zero discharge of the wastewater of the steel combined enterprises is truly realized, the consumption of the new water is reduced, the pollution discharge cost is saved, and the wastewater is recycled, so that considerable economic benefits are generated;

finally, the utility model adopts the method of ozone catalytic oxidation to treat coking wastewater and comprehensive wastewater, thereby greatly reducing the generation of sludge.

Drawings

FIG. 1 is a schematic flow diagram of a coking wastewater and integrated wastewater combined treatment device provided by the utility model;

FIG. 2 is a process flow diagram of the present utility model;

in the drawing the view of the figure,

a 100-coking pretreatment unit; 200-a comprehensive pretreatment unit;

300-a first ozone catalytic oxidation tower; 400-a secondary treatment unit;

500-three times of processing units; 600-a first evaporative crystallization tower;

700-purifying reverse osmosis equipment.

Detailed Description

The coking wastewater and comprehensive wastewater combined treatment device provided by the utility model is further described in detail below with reference to the accompanying drawings and specific examples. The advantages and features of the present utility model will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model.

Referring to fig. 1 to 2, this embodiment discloses a coking wastewater and integrated wastewater combined treatment apparatus (hereinafter referred to as "apparatus") comprising: a coking pretreatment unit 100 for performing solid-liquid separation and reverse osmosis treatment on coking wastewater to obtain coking pretreatment concentrated water and coking pretreatment produced water; the comprehensive pretreatment unit 200 is used for sequentially carrying out primary solid-liquid separation, primary reverse osmosis treatment, ozone catalytic oxidation treatment, secondary solid-liquid separation and secondary reverse osmosis treatment on the comprehensive wastewater to obtain comprehensive pretreatment concentrated water and comprehensive pretreatment produced water; a first ozone catalytic oxidation tower 300 for performing ozone catalytic oxidation treatment on the coking pretreatment concentrated water and the comprehensive pretreatment concentrated water to obtain first-stage combined concentrated water and a combined degradation product; the secondary treatment unit 400 is used for carrying out solid-liquid separation and reverse osmosis treatment on the primary combined concentrated water to obtain secondary combined concentrated water, secondary combined produced water and primary combined filtered concentrated water; the first evaporative crystallization tower 600 is used for performing evaporative crystallization on the second-stage combined concentrated water to obtain a first fixed substance.

The coking wastewater and comprehensive wastewater combined treatment device disclosed by the embodiment performs pretreatment on the coking wastewater and the comprehensive wastewater respectively through the coking pretreatment unit 100 and the comprehensive pretreatment unit 200, and sequentially processes the obtained coking pretreatment concentrated water and the obtained comprehensive pretreatment concentrated water through the first ozone catalytic oxidation tower 300, the secondary treatment unit 400 and the first evaporation crystallization tower 600 to obtain sodium chloride industrial salt and recyclable standard produced water, thereby realizing the purpose of combined treatment of the coking wastewater and the comprehensive wastewater, and achieving the purposes of reducing the occupied area and the equipment investment and the operation cost.

Illustratively, referring to fig. 1 and 2, the coking pretreatment unit 100 includes: the coking pretreatment filtering module is used for filtering after coagulating sedimentation treatment of coking wastewater to obtain flocculating sedimentation and coking filtering concentrated water; and the reverse osmosis equipment is used for carrying out reverse osmosis treatment on the coking filtration concentrated water to obtain coking pretreatment concentrated water and coking pretreatment produced water. The coking pretreatment filtration module comprises a coagulating sedimentation tank A, sand filtration equipment A and ultrafiltration equipment A, wherein the reverse osmosis equipment is first-stage reverse osmosis equipment A. And (3) sending the coking wastewater into a coagulating sedimentation tank A through a water pump, and simultaneously adding a coagulant into the coagulating sedimentation tank A, wherein suspended matters in the coking wastewater form floccule sediment to obtain floccule sediment, so that solid-liquid separation is carried out on the coking wastewater. And then, the wastewater after coagulating sedimentation treatment can be pumped into sand filtration equipment A and ultrafiltration equipment A for filtration by a water pump, and solid particles such as flocculating sedimentation and the like are further separated. For example, the wastewater system after coagulating sedimentation treatment is pumped into the sand filtration equipment A, and then the wastewater after filtering by the sand filtration equipment A is pumped into the ultrafiltration equipment A for filtering. The flocculation precipitation after solid-liquid separation can be recycled, for example, heavy metals in the flocculation precipitation are extracted and reused by chemical, physical and other methods. And (3) conveying the coking filtering concentrated water into first-stage reverse osmosis equipment A through a water pump to perform first-stage reverse osmosis treatment to obtain coking pretreatment concentrated water and coking pretreatment produced water.

Illustratively, referring to FIG. 2, the coking pretreatment unit 100 further comprises: and the resin softener A is used for carrying out resin softening treatment on the coking and filtering concentrated water. In order to improve the reverse osmosis treatment effect of the coking filtered concentrated water, before the coking filtered concentrated water is sent to the first-stage reverse osmosis equipment A, the coking filtered concentrated water can be pumped into the resin softener A through a water pump to be softened so as to reduce the hardness of the coking filtered concentrated water, and then the softened coking filtered concentrated water is sent to the first-stage reverse osmosis equipment A to be subjected to the first-stage reverse osmosis treatment.

Illustratively, referring to fig. 1 and 2, the integrated preprocessing unit 200 includes: the comprehensive pretreatment filter module is used for carrying out primary solid-liquid separation on the comprehensive wastewater sequentially through coagulating sedimentation and ultrafiltration steps, separating flocculating sedimentation and wastewater, and carrying out primary reverse osmosis treatment on the wastewater after the solid-liquid separation to obtain standard produced water and primary comprehensive concentrated water; the second ozone catalytic oxidation tower is used for carrying out ozone catalytic oxidation treatment on the first-stage comprehensive concentrated water to obtain first-stage degradation products and comprehensive catalytic concentrated water; the comprehensive pretreatment filter equipment is used for sequentially carrying out active carbon adsorption and ultrafiltration treatment on the comprehensive catalytic concentrated water and carrying out secondary solid-liquid separation to obtain the standard produced water and the comprehensive pretreatment concentrated water. The comprehensive pretreatment filter module comprises a coagulating sedimentation tank B, an ultrafiltration device B and a first-stage reverse osmosis device B. The comprehensive pretreatment filter equipment comprises an activated carbon adsorption equipment A, an ultrafiltration equipment C, a three-stage reverse osmosis equipment and a four-stage reverse osmosis equipment. And (3) conveying the comprehensive wastewater into a coagulating sedimentation tank B through a water pump, simultaneously adding a coagulant into the coagulating sedimentation tank B, forming a floccule precipitate by suspended matters in the comprehensive wastewater to obtain a floccule precipitate, carrying out solid-liquid separation on the comprehensive wastewater, filtering the wastewater after coagulating precipitation through an ultrafiltration device B, and conveying the wastewater after ultrafiltration filtration into a first-stage reverse osmosis device B through the water pump to carry out first-stage reverse osmosis treatment to obtain standard produced water and first-stage comprehensive concentrated water. The water produced after reaching the standard can be directly recycled. And then the first-stage comprehensive concentrated water is pumped into a second ozone catalytic oxidation tower for treatment by a water pump, so that the comprehensive catalytic concentrated water is obtained. Ozone generates hydroxyl free radicals under the action of a catalyst, and can react with refractory organic matters in the primary comprehensive concentrated water to obtain primary degradation matters so as to remove refractory organic matters in the water, wherein the primary degradation matters can be recycled. The ozone catalytic oxidation process adopts a heterogeneous catalyst taking a high-strength silicon-aluminum compound as a carrier. The first-stage comprehensive concentrated water is sent into an ozone catalytic oxidation tower to react for 15 minutes under the catalysis of a catalyst, the air inflow of ozone is related to the COD content in the first-stage comprehensive concentrated water, for example, as a preferred embodiment of the utility model, the mass concentration ratio of the ozone to the COD content is: cod=1.5: 1. wherein COD represents chemical oxygen demand (also called chemical oxygen demand, chemical Oxygen Demand, simply called COD). And (3) sequentially carrying out filtering treatment operations such as an activated carbon adsorption device A, an ultrafiltration device C and the like on the comprehensive catalytic concentrated water, carrying out secondary solid-liquid separation, removing solid particles in the catalytic concentrated water to obtain secondary comprehensive concentrated water, sequentially conveying the secondary comprehensive concentrated water into a tertiary reverse osmosis device and a quaternary reverse osmosis device through a water pump to carry out secondary reverse osmosis treatment to obtain standard-reaching produced water and comprehensive pretreatment concentrated water, recycling the standard-reaching produced water, and carrying out subsequent operation steps on the comprehensive pretreatment concentrated water.

In order to improve the treatment effect of the first-stage comprehensive concentrated water in the second ozone catalytic oxidation tower for ozone catalytic oxidation, before the first-stage comprehensive concentrated water is sent to the second ozone catalytic oxidation tower, the first-stage comprehensive concentrated water can be sequentially sent to the sand filtering equipment B and the ultrafiltration equipment D for filtering treatment through a water pump, and then the first-stage comprehensive concentrated water is pumped into the second ozone catalytic oxidation tower through the water pump. It should be noted that the first-stage comprehensive concentrated water can be subjected to multiple filtering operations so as to improve the treatment effect of ozone catalytic oxidation of the first-stage comprehensive concentrated water.

In order to improve the effect of the secondary reverse osmosis treatment, the catalytic wastewater can be sent into a resin softener B for softening treatment before the catalytic wastewater is subjected to the reverse osmosis treatment, so that the hardness of the wastewater is reduced, scale is prevented from being generated in treatment equipment, and then the reverse osmosis treatment is performed.

For example, referring to fig. 1 and 2, a first ozone catalytic oxidation tower 300 is used for mixing coking pretreatment concentrated water and comprehensive pretreatment concentrated water and performing ozone catalytic oxidation treatment to obtain primary combined concentrated water and combined degradation product. The coking pretreatment concentrated water obtained after the coking wastewater is treated by the coking pretreatment unit 100, and the comprehensive pretreatment concentrated water obtained after the comprehensive wastewater is treated by the comprehensive pretreatment unit 200 are respectively sent into the first ozone catalytic oxidation tower 300 through a water pump for catalytic oxidation treatment, and ozone generates hydroxyl free radicals under the action of a catalyst to react with refractory organic matters in the coking pretreatment concentrated water and the comprehensive pretreatment concentrated water so as to remove refractory organic matters in the wastewater, thereby obtaining primary combined concentrated water and combined degraded matters.

Illustratively, referring to fig. 1 and 2, the secondary processing unit 400 includes: the primary filtering equipment is used for sequentially carrying out active carbon adsorption, ultrafiltration and nanofiltration treatment on the primary combined concentrated water to carry out solid-liquid separation so as to obtain primary combined filtered concentrated water and primary combined filtered produced water; the high-pressure reverse osmosis equipment is used for carrying out high-pressure reverse osmosis treatment on the primary combined filtered produced water to obtain secondary combined concentrated water and secondary combined produced water. The primary filtering equipment comprises active carbon adsorption equipment B, ultrafiltration equipment E and primary nanofiltration equipment. And (3) sequentially conveying the primary combined concentrated water into an activated carbon adsorption device B, an ultrafiltration device E and a primary nanofiltration device through a water pump to perform solid-liquid separation to obtain primary combined filtered concentrated water and primary combined filtered produced water. After the primary combined concentrated water is subjected to the primary nanofiltration treatment after the active carbon adsorption treatment and the ultrafiltration treatment, the aperture of the nanofiltration membrane is in a nano level, and the surface of the nanofiltration membrane is charged, so that high-valence ionic substances (such as sulfate radicals) can be blocked from passing through, and the obtained primary combined filtered water is mainly primary sodium chloride solution, and the primary combined filtered concentrated water is mainly primary sodium sulfate solution.

To further enhance the separation effect of the sodium chloride solution and the sodium sulfate solution, the primary filtered product water (i.e., sodium chloride solution) is subjected to nanofiltration again. Specifically, the primary filtration produced water is pumped into purification nanofiltration equipment through a water pump to carry out purification nanofiltration treatment, so as to obtain primary combined nanofiltration produced water and primary combined nanofiltration concentrated water. Similarly, as the aperture of the nanofiltration membrane is in the nanometer level and the surface of the nanofiltration membrane is charged, sulfate ions can be blocked from passing, the obtained primary combined nanofiltration produced water is mainly a secondary sodium chloride solution, and the primary combined nanofiltration concentrated water is mainly a secondary sodium sulfate solution. Wherein, the concentration of the secondary sodium chloride solution is larger than that of the primary sodium chloride solution because the primary sodium chloride solution is concentrated to obtain the secondary sodium chloride solution. The obtained first-stage combined filtered concentrated water and first-stage combined nanofiltration concentrated water are treated by a three-time treatment unit 500 to obtain a second solid substance and third-stage combined produced water, and the first-stage combined filtered concentrated water and the first-stage combined nanofiltration concentrated water are both solutions of sodium sulfate, so that the second solid substance is sodium sulfate industrial salt.

The first-stage combined filtered produced water is sent to high-pressure reverse osmosis equipment through a water pump, and is subjected to high-pressure reverse osmosis treatment through the high-pressure reverse osmosis equipment to obtain second-stage combined concentrated water and second-stage combined produced water. Wherein the second-stage combined concentrated water is a solution containing sodium chloride. The second-level combined produced water is subjected to purification reverse osmosis treatment by a purification reverse osmosis device 700, and the obtained standard produced water can be recycled. And the second-stage combined concentrated water enters the next working procedure. It should be noted that, the high-pressure reverse osmosis device is a common device in the prior art of wastewater treatment, and those skilled in the art are already familiar with the specific principle, and specific setting parameters thereof are determined according to the actual situation.

In order to improve the high-pressure reverse osmosis treatment effect of the primary combined filtered concentrated water, after the primary combined concentrated water is subjected to ultrafiltration treatment, the concentrated water subjected to ultrafiltration treatment is pumped into a resin softener C through a water pump so as to reduce the hardness of the wastewater and prevent scale from being generated in treatment equipment. In the resin softening treatment in the step, chelating resin is adopted, and besides the hardness of calcium and magnesium, the enriched heavy metal ions can be removed so as to reduce the hardness in water.

Illustratively, referring to FIG. 2, the secondary processing unit 400 further includes: the fluorine and silicon removing device A is arranged between the primary filtering device and the evaporation crystallization tower A and is used for carrying out fluorine and silicon removing treatment on the primary combined filtering produced water. In order to improve the purity of sodium chloride industrial salt, the second-stage combined concentrated water is further subjected to defluorination and desilication between the high-pressure reverse osmosis treatment and the evaporative crystallization treatment. The concentrated water after the high-pressure reverse osmosis treatment is pumped into fluorine and silicon removing equipment through a water pump, and fluorine removing agent, silicon removing agent and coagulant are added into the fluorine and silicon removing equipment, so that dissolved fluorine ions and silicate in the water are converted into insoluble precipitate and removed from the water, and the purpose of removing fluorine ions and silicate in sodium chloride solution is achieved.

Illustratively, referring to fig. 1 and 2, the apparatus further comprises: the purification reverse osmosis device 700 is used for purifying and filtering coking pretreatment produced water to obtain standard produced water. The coking pretreatment produced water is filtered by a purification reverse osmosis device 700 to obtain standard-reaching produced water and non-standard-reaching produced water, and the non-standard-reaching produced water is softened by a resin softener A, so that concentrated water filtered by the first-stage reverse osmosis device is circularly treated among the purification reverse osmosis device 700, the resin softener A and the first-stage reverse osmosis device A to obtain recyclable standard-reaching produced water.

Illustratively, the apparatus further comprises; and the tertiary treatment unit 500 is used for carrying out ozone catalytic oxidation treatment on the primary combined filtered concentrated water to obtain a secondary degradation product and secondary combined catalytic concentrated water, and carrying out evaporation crystallization treatment on the secondary combined catalytic concentrated water to obtain a second solid substance.

For example, referring to fig. 1 and 2, the tertiary treatment unit 500 includes a third ozone catalytic oxidation tower for subjecting the primary combined filtered concentrated water to ozone catalytic oxidation treatment to obtain a secondary degradation product and a secondary combined catalytic concentrated water. And the second evaporation crystallization tower is used for carrying out evaporation crystallization treatment on the two-stage combined catalytic concentrated water to obtain a second solid substance. And (3) pumping the first-stage combined filtered concentrated water into a third ozone catalytic oxidation tower through a water pump to perform ozone catalytic oxidation treatment, so as to obtain a second-stage degradation product and the second-stage combined catalytic concentrated water, and recycling the second-stage degradation product. Wherein the two-stage combined catalytic concentrated water is a three-stage sodium sulfate solution, and the two-stage combined catalytic concentrated water enters the next step. And (3) conveying the two-stage combined catalytic concentrated water into a second evaporation crystallization tower through a water pump to perform evaporation crystallization treatment, wherein the second solid substance is sodium sulfate industrial salt because the two-stage combined catalytic concentrated water is a three-stage sodium sulfate solution. The sodium sulfate industrial salt can be recycled, the purpose of zero discharge of combined treatment of coking wastewater and comprehensive wastewater is realized, the environmental protection approval problem is solved, a green channel is opened up for new increase capacity of enterprises, the zero discharge of wastewater of steel combined enterprises is truly realized, the consumption of new water is reduced, the pollution discharge cost is saved, the wastewater is recycled, and considerable economic benefit is generated.

In addition, the first-stage combined nanofiltration concentrated water obtained by purifying and nanofiltration treatment of the first-stage combined filtration produced water can be pumped into a third ozone catalytic oxidation tower together with the first-stage combined filtration concentrated water through a water pump to carry out ozone catalytic oxidation treatment.

In order to further improve the separation effect of sodium chloride and sodium sulfate in the first-stage combined filtered concentrated water and the first-stage combined nanofiltration concentrated water, the first-stage combined filtered concentrated water and the first-stage combined nanofiltration concentrated water are firstly pumped into high-pressure nanofiltration equipment for high-pressure nanofiltration treatment through a water pump before being pumped into a third ozone catalytic oxidation tower, and then the concentrated water after the high-pressure nanofiltration treatment is pumped into the third ozone catalytic oxidation tower for ozone catalytic oxidation treatment. And the produced water obtained after the high-pressure nanofiltration treatment is subjected to purification nanofiltration, so that concentrated water is circularly treated among the purification nanofiltration, the first-stage nanofiltration and the high-pressure nanofiltration, and chloride ions and sulfate radicals in the first-stage combined filtration concentrated water are effectively separated, thereby achieving the purpose of improving the purity of the obtained industrial salt.

Besides the different emphasis on the functions of the first-stage nanofiltration equipment, the purification nanofiltration equipment and the high-pressure nanofiltration equipment, the operation pressure of the first-stage nanofiltration equipment is different, the operation pressure of the first-stage nanofiltration equipment is 22 kg, the purification nanofiltration equipment is 16 kg, and the high-pressure nanofiltration equipment is 38 kg.

In addition, in order to improve the purity of sodium sulfate industrial salt, before the sodium sulfate solution is sent to the second evaporation crystallization tower, the sodium sulfate solution is sequentially sent to the activated carbon adsorption equipment C and the defluorination and silicon removal equipment for treatment by a water pump. When the sodium sulfate solution is subjected to defluorination and desilication treatment, concentrated water after adsorption filtration is pumped into defluorination and desilication equipment B through a water pump, and then a defluorination agent, a desilication agent and a coagulant are added into the defluorination and desilication equipment B, so that dissolved fluorine ions and silicate in the water are converted into insoluble precipitate and removed from the water, and the purpose of removing the fluorine ions and silicate in the sodium sulfate solution is achieved.

The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.

Claims (10)

1. A coking wastewater and integrated wastewater combined treatment device, characterized by comprising:

the coking pretreatment unit is used for carrying out solid-liquid separation and reverse osmosis treatment on the coking wastewater to obtain coking pretreatment concentrated water and coking pretreatment produced water;

the comprehensive pretreatment unit is used for sequentially carrying out primary solid-liquid separation, primary reverse osmosis treatment, ozone catalytic oxidation treatment, secondary solid-liquid separation and secondary reverse osmosis treatment on the comprehensive wastewater to obtain comprehensive pretreatment concentrated water and comprehensive pretreatment produced water;

the first ozone catalytic oxidation tower is used for mixing the coking pretreatment concentrated water and the comprehensive pretreatment concentrated water and then carrying out ozone catalytic oxidation treatment to obtain primary combined concentrated water and combined degradation products;

the secondary treatment unit is used for carrying out solid-liquid separation and reverse osmosis treatment on the primary combined concentrated water to obtain secondary combined concentrated water, secondary combined produced water and primary combined filtered concentrated water;

and the first evaporation crystallization tower is used for carrying out evaporation crystallization treatment on the second-stage combined concentrated water to obtain a first solid substance.

2. The coking wastewater and integrated wastewater combined treatment apparatus according to claim 1, further comprising:

and the purification reverse osmosis equipment is used for purifying and filtering the coking pretreatment produced water to obtain the produced water reaching the standard.

3. The coking wastewater and integrated wastewater combined treatment apparatus according to claim 1, wherein the apparatus further comprises;

and the tertiary treatment unit is used for carrying out ozone catalytic oxidation treatment on the primary combined filtered concentrated water to obtain a secondary degradation product and secondary combined catalytic concentrated water, and carrying out evaporative crystallization treatment on the secondary combined catalytic concentrated water to obtain a second solid substance.

4. The coking wastewater and integrated wastewater combined treatment apparatus according to claim 1, wherein the coking pretreatment unit includes:

the coking pretreatment filter module is used for filtering after coagulating sedimentation treatment of coking wastewater to obtain flocculating sedimentation and coking filtration concentrated water;

and the reverse osmosis equipment is used for carrying out reverse osmosis treatment on the coking filtration concentrated water to obtain coking pretreatment concentrated water and coking pretreatment produced water.

5. The coking wastewater and integrated wastewater combined treatment apparatus according to claim 1, wherein the integrated pretreatment unit comprises:

the comprehensive pretreatment filter module is used for carrying out primary solid-liquid separation on the comprehensive wastewater sequentially through coagulating sedimentation and ultrafiltration steps, separating flocculating sedimentation and wastewater, and carrying out primary reverse osmosis treatment on the wastewater after the solid-liquid separation to obtain standard produced water and primary comprehensive concentrated water;

the second ozone catalytic oxidation tower is used for carrying out ozone catalytic oxidation treatment on the first-stage comprehensive concentrated water to obtain first-stage degradation products and comprehensive catalytic concentrated water;

the comprehensive pretreatment filter equipment is used for sequentially carrying out active carbon adsorption and ultrafiltration treatment on the comprehensive catalytic concentrated water and carrying out secondary solid-liquid separation to obtain the standard produced water and the comprehensive pretreatment concentrated water.

6. The coking wastewater and integrated wastewater combined treatment apparatus according to claim 1, wherein the secondary treatment unit comprises:

the primary filtering equipment is used for sequentially carrying out active carbon adsorption, ultrafiltration and nanofiltration treatment on the primary combined concentrated water to carry out solid-liquid separation so as to obtain primary combined filtered concentrated water and primary combined filtered produced water;

the high-pressure reverse osmosis equipment is used for carrying out high-pressure reverse osmosis treatment on the primary combined filtered produced water to obtain secondary combined concentrated water and secondary combined produced water.

7. A coking wastewater and integrated wastewater combined treatment apparatus according to claim 3 in which said tertiary treatment unit comprises:

the third ozone catalytic oxidation tower is used for carrying out ozone catalytic oxidation treatment on the primary combined filtered concentrated water to obtain a secondary degradation product and secondary combined catalytic concentrated water;

and the second evaporation crystallization tower is used for carrying out evaporation crystallization treatment on the two-stage combined catalytic concentrated water to obtain a second solid substance.

8. The coking wastewater and integrated wastewater combined treatment apparatus according to claim 6, wherein said secondary treatment unit further comprises:

the fluorine and silicon removing device is arranged between the primary filtering device and the evaporation crystallization tower and is used for carrying out fluorine and silicon removing treatment on the primary combined filtering produced water.

9. The coking wastewater and integrated wastewater combined treatment apparatus according to claim 4, wherein said coking pretreatment unit further comprises:

and the resin softener is used for carrying out resin softening treatment on the coking and filtering concentrated water.

10. The coking wastewater and integrated wastewater combined treatment apparatus according to claim 7, wherein said tertiary treatment unit further comprises:

the high-pressure nanofiltration equipment is arranged between the third ozone catalytic oxidation tower and the secondary treatment unit and is used for carrying out high-pressure nanofiltration treatment on the primary combined filtered concentrated water.