Treatment method of charring slurry wastewater

Abstract

The invention discloses a treatment method of charring slurry wastewater. The treatment method comprises the following steps: providing charring slurry wastewater containing a conductive carbon material, a dispersant and a binder; adding oil into the carbon coating slurry wastewater, fully mixing, and then standing for layering and separating to obtain a first treatment solution and a mixture; placing the first treatment liquid in a reaction kettle, sealing, then raising the temperature in the reaction kettle to be higher than the boiling point of the dispersing agent to obtain the dispersing agent, and taking the remaining liquid in the reaction kettle as second treatment liquid; and adding a treating agent into the second treating fluid, fully mixing to precipitate the binder, and separating to obtain a third treating fluid and the binder. According to the treatment method of the carbon-coated slurry wastewater, a conductive carbon material, a dispersing agent and a binding agent in the carbon-coated slurry wastewater can be removed respectively, and the COD (Chemical Oxygen Demand) and suspended matter indexes of the carbon-coated slurry wastewater treated by the treatment method of the carbon-coated slurry wastewater can reach the emission standard in combination with a test case part in the specification.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a method for treating carbon-coated slurry wastewater. Background Art

[0002] With the development of science and technology, the chemical materials industry has been vigorously developed, and a large number of new high-molecular organic materials have been synthesized. Due to the complex structure of organic matter and the reduced biodegradability, industrial wastewater is discharged without meeting the discharge standards. Then the environment will be seriously polluted due to the accumulated wastewater, and the environmental quality will decline. Industrial wastewater varies greatly, so different treatment processes correspond to different treatment processes. We can only analyze and treat them individually according to the components in the wastewater. Before choosing the treatment process, we need to understand the form of pollutants in the waste liquid. In our water treatment, pollutants are divided according to the particle size of pollutants, and there are three states: suspended matter, colloid, and dissolved matter. In general, the suspended state is the easiest to treat, while the colloid and dissolved matter are more difficult to treat. Some industrial wastewaters have relatively simple water quality components, which can be recycled or directly discharged into the sewage pipe after simple treatment. Some water quality suspended matter has too much water quality, which is easy to block the filter membrane. If all indicators do not meet the standards, separate process treatment is required. It can be seen from the process that the preparation of slurry will eventually produce a lot of industrial wastewater, and some of the components are complex.

[0003] At present, carbon-coated slurry mainly includes conductive graphite, conductive carbon black, graphene, dispersant and binder. In the preparation of carbon-coated slurry, carbon-coated slurry wastewater is not only generated during the production process, but also during the washing of equipment after the preparation is completed. Carbon-coated slurry wastewater also includes conductive graphite, conductive carbon black, graphene, dispersant and binder. The traditional water treatment process cannot meet the emission indicators after treatment. The COD and suspended solids indicators are too high and cannot be reduced to the emission standards. Summary of the invention

[0004] Based on this, it is necessary to provide a method for treating carbon-coated slurry wastewater that can solve the above problems.

[0005] A method for treating carbon coating slurry wastewater comprises the following steps:

[0006] Providing carbon-coated slurry wastewater and pre-treating the carbon-coated slurry wastewater, wherein the carbon-coated slurry wastewater includes a conductive carbon material, a dispersant and a binder;

[0007] Adding oil to the previously treated carbon-coated slurry wastewater, mixing thoroughly so that the conductive carbon material is absorbed into the oil and agglomerated, then standing to separate and separate, to obtain a first treatment liquid and a mixture, wherein the mass ratio of the carbon-coated slurry wastewater to the oil is 1:0.003-0.006;

[0008] The first treatment liquid is placed in a reactor and sealed, and then the temperature in the reactor is raised to a temperature higher than the boiling point of the dispersant, and the dispersant in the first treatment liquid in the reactor is turned into steam, and the steam is collected and liquefied to obtain the dispersant, and the remaining liquid in the reactor is the second treatment liquid;

[0009] A treatment agent is added to the second treatment liquid, and the binder is precipitated after sufficient mixing, and a third treatment liquid and the binder are obtained after separation.

[0010] In one embodiment, the dispersant is polyvinyl pyrrolidone;

[0011] The operation of subsequently increasing the temperature in the reactor to a temperature higher than the boiling point of the dispersant is as follows: the temperature in the reactor is subsequently increased to 220°C.

[0012] In one embodiment, the oil has a density of 0.8 g / cm 3 of kerosene.

[0013] In one embodiment, the method further includes the following operations: uniformly mixing the mixture and tetrachloroethylene at a mass ratio of 1:1, and then filtering and retaining the filter residue, wherein the filter residue is the conductive carbon material.

[0014] In one embodiment, the binder is carboxymethyl cellulose;

[0015] The operation of adding a treatment agent to the second treatment liquid and allowing the binder to precipitate after sufficient mixing is as follows: adding alcohols to the second treatment liquid so that the mass concentration of the alcohols in the mixed system is not less than 60%, allowing the binder to precipitate after sufficient mixing, and obtaining a third treatment liquid and the binder after separation.

[0016] In one embodiment, the alcohol is ethanol.

[0017] In one embodiment, the binder is carboxymethyl cellulose;

[0018] The operation of adding a treatment agent to the second treatment liquid and allowing the binder to precipitate after sufficient mixing is as follows: adding an acid to the second treatment liquid so that the pH in the mixed system is not higher than 2, allowing the binder to precipitate after sufficient mixing, and obtaining a third treatment liquid and the binder after separation.

[0019] In one embodiment, the acid is hydrochloric acid.

[0020] In one embodiment, the pre-treatment operation of the carbon-coated slurry wastewater is: the carbon-coated slurry wastewater is screened with a grid reverse scooping screen, wherein the grid gap of the grid reverse scooping screen is 16 mm, and the specification of the grid reverse scooping screen is 0.05 m 3 / 103m 3 The screening flow rate is 0.6m / s~1.0m / s.

[0021] In one embodiment, the method further includes the following steps: removing or rendering harmless the treatment agent in the third treatment liquid, and then adding bacteria to perform fermentation treatment.

[0022] The method for treating carbon-coated slurry wastewater of the present invention can remove the conductive carbon material, dispersant and binder in the carbon-coated slurry wastewater respectively. Combined with the test example part of the specification, the COD and suspended matter indicators of the carbon-coated slurry wastewater treated by the method for treating carbon-coated slurry wastewater of the present invention can meet the discharge standards. DETAILED DESCRIPTION

[0023] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various parts in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] The present invention discloses a method for treating carbon coating slurry wastewater according to an embodiment of the present invention, comprising the following steps:

[0027] S10, providing carbon coating slurry wastewater, and pre-treating the carbon coating slurry wastewater.

[0028] Carbon coating slurry wastewater refers to the wastewater generated during the production and processing of carbon coating slurry of secondary batteries.

[0029] Generally speaking, carbon coating slurry wastewater includes conductive carbon material, dispersant and binder.

[0030] Preferably, in this embodiment, the operation of pre-treating the carbon-coated slurry wastewater is: screening the carbon-coated slurry wastewater with a grid reverse scooping screen, wherein the grid gap of the grid reverse scooping screen is 16 mm, and the specification of the grid reverse scooping screen is 0.05 m 3 / 103m 3 The screening flow rate is 0.6m / s~1.0m / s.

[0031] The specification of the anti-fishing type grid is 0.05m 3 / 103m 3 This means that the screen residue interception rate is 0.05m 3 / 103m 3 (screenings / wastewater).

[0032] Conductive carbon materials generally include conductive carbon black, conductive graphite and graphene.

[0033] Considering that the conductive carbon materials present in the carbon-coated slurry wastewater are prone to agglomeration and precipitation, pretreatment can perform preliminary cleaning of the agglomerated and precipitated conductive carbon materials, remove the agglomerated and precipitated conductive carbon materials, and reduce the difficulty of subsequent treatment processes.

[0034] S20, adding oil to the pre-treated carbon-coated slurry wastewater obtained in S10, mixing thoroughly so that the conductive carbon material is absorbed into the oil and agglomerated, then standing to separate the layers, and obtaining a first treated liquid and a mixture.

[0035] Considering that the conductive carbon material is a material that has undergone multiple dispersion treatments, its particle size is very small. However, it is precisely because of its small size that its mass is light. Therefore, the oil agglomeration method is used in S20 to agglomerate the conductive carbon material into the oil, float it up and then separate it to obtain a mixture of conductive carbon material and oil.

[0036] In this step, the conductive carbon material is processed and can be recycled or incinerated later.

[0037] When the conductive carbon material is absorbed into the oil and agglomerated, its hydrophobicity is enhanced, so that it floats on the water surface. The conductive carbon material and the oil can then be separated with filter paper to obtain a mixture of the conductive carbon material and the oil.

[0038] Generally speaking, the mass ratio of carbon coating slurry wastewater to oil can be 1:0.003~0.006.

[0039] Preferably, in this embodiment, the oil has a density of 0.8 g / cm3 of kerosene.

[0040] For thorough mixing, you can choose to stir at a speed of 500r / min, and the stirring time should be determined according to the actual situation.

[0041] Preferably, S20 further includes the following operation: uniformly mixing the mixture and tetrachloroethylene, and then filtering and retaining the filter residue, wherein the filter residue is the conductive carbon material.

[0042] More preferably, the mass ratio of the mixture to tetrachloroethylene is 1:1.

[0043] Preferably, the separated conductive carbon material needs to be dried at 180° C. and then recycled.

[0044] S30, placing the first treatment liquid obtained in S20 in a reactor and sealing it, then raising the temperature in the reactor to a temperature higher than the boiling point of the dispersant, and allowing the dispersant in the first treatment liquid in the reactor to form steam, collecting the steam and liquefying the steam to obtain the dispersant, and the remaining liquid in the reactor is the second treatment liquid.

[0045] In this embodiment, the dispersant is polyvinyl pyrrolidone.

[0046] The required temperature is 220°C due to the boiling point of polyvinyl pyrrolidone.

[0047] Preferably, in S30, the operation of subsequently increasing the temperature in the reactor to a temperature higher than the boiling point of the dispersant is: subsequently increasing the temperature in the reactor to 220°C.

[0048] The temperature of the first treatment liquid is raised to a temperature required for the boiling point of polyvinyl pyrrolidone, and the polyvinyl pyrrolidone reaching the required temperature is evaporated.

[0049] In this embodiment, the pressure inside the reactor is increased by controlling the reactor itself, and the temperature inside the reactor is finally increased to 220°C.

[0050] S40, adding a treatment agent to the second treatment liquid obtained in S30, mixing them thoroughly to allow the binder to precipitate, and separating to obtain a third treatment liquid and a binder.

[0051] Specifically, in this embodiment, the binder is carboxymethyl cellulose.

[0052] It should be noted that, in this embodiment, raising the temperature of the first treatment liquid to 220° C. will neither affect the color of the carboxymethyl cellulose nor carbonize the carboxymethyl cellulose.

[0053] Carboxymethyl cellulose has two properties. One is that when dissolved carboxymethyl cellulose meets high concentration of ethanol, white flocs will appear; the other is that when the pH value is less than 2, solids will precipitate.

[0054] Preferably, in this embodiment, the treatment agent is added to the second treatment liquid, and the binder is precipitated after sufficient mixing. The operation is as follows: alcohol is added to the second treatment liquid so that the mass concentration of alcohol in the mixed system is not less than 60%, the binder is precipitated after sufficient mixing, and the third treatment liquid and the binder are obtained after separation.

[0055] That is, in this embodiment, the treatment agent is alcohol.

[0056] Typically, the alcohol is ethanol.

[0057] Preferably, the alcohol is an ethanol solution with a concentration of 95 wt%.

[0058] In another embodiment, the treatment agent is added to the second treatment liquid, and the binder is precipitated after sufficient mixing. The operation is as follows: an acid is added to the second treatment liquid so that the pH of the mixed system is not higher than 2, the binder is precipitated after sufficient mixing, and a third treatment liquid and a binder are obtained after separation.

[0059] That is, in this embodiment, the treatment agent is an acid.

[0060] Typically, the acid is hydrochloric acid.

[0061] The recovered polyvinyl pyrrolidone and carboxymethyl cellulose can be used to synthesize PVP-CMC packaging materials again.

[0062] Specifically, polyvinyl pyrrolidone and carboxymethyl cellulose can be dissolved in water again, and the mixed solution can be used to prepare a dry hydrogel film adhesive prepared by a solution casting method, which can be used as a subsequent packaging material.

[0063] Preferably, S40 further includes the following operation: after removing or rendering harmless the treatment agent in the third treatment liquid, adding bacteria and performing fermentation treatment.

[0064] When the treatment agent is alcohol, the operation of removing or harmlessly treating the treatment agent in the third treatment liquid is: directly performing biological treatment, mainly anaerobic treatment, in which anaerobic bacteria perform anaerobic respiration to achieve alcohol treatment.

[0065] When the treatment agent is an acid, the operation of removing or harmlessly treating the treatment agent in the third treatment liquid is: adding alkaline substances to the third treatment liquid, adjusting the pH of the third treatment liquid to 6.5-8.5, and creating a breeding environment for subsequent anaerobic bacteria.

[0066] It is generally recommended that the ratio of the amount of bacteria added to the third treatment liquid is 1g~2g:1m 3 , that is, 1g to 2g of bacteria are added to every cubic meter of sewage. Due to the limitation of oxygen transfer rate, the organic matter concentration cannot be too high when microorganisms perform aerobic biological treatment. Fermentation treatment generally includes three stages: the first stage is the hydrolysis stage, in which fermentation acid-producing bacteria decompose macromolecules into small molecules through bacterial extracellular enzymes, and then in the second stage of fermentation, the fermentation acid-producing bacteria soluble organic matter is converted into end products mainly composed of volatile fatty acids, and then enters the third stage of acetic acid production, where oxygen-producing acetic acid-producing bacteria decompose acetic acid and hydrogen, laying the foundation for the last stage of methane production, and methanogens convert acetic acid and hydrogen into methane and carbon dioxide.

[0067] The main problem that the present invention needs to solve is that the dispersant and binder in the carbon coating slurry wastewater are the problem that industrial wastewater is difficult to meet the discharge standards even after traditional treatment. Even if it is discharged, it will put a great pressure on the water purification plant. These organic substances are often the reason why the COD in the wastewater cannot be reduced.

[0068] The method for treating carbon-coated slurry wastewater of the present invention can remove the conductive carbon material, dispersant and binder in the carbon-coated slurry wastewater respectively. Combined with the test example part of the specification, the COD and suspended matter indicators of the carbon-coated slurry wastewater treated by the method for treating carbon-coated slurry wastewater of the present invention can meet the discharge standards.

[0069] Among them, the treatment method of dispersant and binder not only reduces the COD in the wastewater due to organic matter, but also reduces the pressure of water purification plant to treat carbon-coated slurry wastewater in the later stage, and also allows the useful substances in the carbon-coated slurry wastewater to be recovered, and the packaging cost of the later industrial line can be saved by synthesizing packaging materials through existing methods. The conductive carbon material can also be recycled again, and the purity of the conductive carbon material and its reuse in the preparation of conductive slurry can be guaranteed.

[0070] The present invention ensures that subsequent discharge does not bring excessive pressure to the water purification plant, is easy to use and operate, recycles waste in wastewater, protects the environment, reduces costs, and does not occupy too much water treatment time in the water purification plant.

[0071] The method for treating carbon-coated slurry wastewater of the present invention can treat carbon-coated slurry wastewater to reduce the difficulty of treatment and meet the emission standards. The carbon-coated slurry wastewater can also be recycled and synthesized into packaging film. The treatment process is simple and easy to use, stable and sustainable, and the packaging can be used for various purposes, saving packaging costs, being environmentally friendly, low-carbon and wasteful.

[0072] The following are specific embodiments.

[0073] In a specific embodiment, the wastewater generated by preparing the carbon-coated slurry comes from a factory in Guangdong, and the bacterial strains are purchased from a mixed strain of Guangzhou Qingwo Biotechnology Co., Ltd., which includes methanogens, hydrogen-producing and acetic acid-producing bacteria, and fermentation bacteria.

[0074] Example 1

[0075] Place the carbon slurry wastewater in the wastewater pool, open the gap 16mm, 0.05m 3 / 103m 3 (Grille / wastewater) The grate makes it operate at a speed of 0.6m / s to 1m / s, and the conductive carbon materials that are agglomerated and precipitated at the bottom are taken out.

[0076] Take 47.0g / L of pretreated carbon-coated slurry wastewater and add 0.003 times the mass of carbon-coated slurry wastewater under stirring at 500r / min. The density is 0.8g / cm 3 After stirring for 30 minutes, the kerosene aggregates the conductive carbon materials floating and dispersed in the wastewater. After standing for 10 minutes, the layers are separated and then the first treatment liquid, kerosene and conductive carbon materials are obtained. According to the mass ratio of 1:1, the conductive carbon material is soaked in tetrachloroethylene for 15 minutes to remove the kerosene on the surface of the conductive carbon material. Finally, it is taken out and dried at 180℃ for 45 minutes to obtain the conductive carbon material for further use.

[0077] The first treatment liquid is placed in a reactor, and the temperature is raised to 220°C to reach the boiling point of polyvinyl pyrrolidone, so as to realize the process of polyvinyl pyrrolidone from liquid to gaseous state, and its vapor is collected and liquefied to obtain polyvinyl pyrrolidone. The remaining liquid in the reactor is the second treatment liquid.

[0078] According to the mass ratio of 1:2, 95wt% of alcohol was added to the second treatment liquid, and the mixture was stirred evenly, so that white floccules were precipitated. After filtering, carboxymethyl cellulose and the third treatment liquid were obtained.

[0079] The third treatment liquid is introduced into the anaerobic tank for pretreatment and screening, and then enters the reaction tank for contact to hydrolyze the organic matter in the third treatment liquid. The ratio of the added amount of the strain to the third treatment liquid is 100g: 1m 3, dilute the strain with water at 1:10, add 1 kg of sucrose and stir evenly, let it stand for 1 to 2 hours, and then mix it in the contact reaction tank with the third treatment liquid to carry out a series of hydrolysis steps. Anaerobic treatment requires sufficient reaction metabolism, so the shortest time is 2 to 3 months, and the survival period of anaerobic bacteria is 3 months, so according to the specific situation, analyze and detect dissolved oxygen. If the dissolved oxygen is not between 0.2 mg / L and 0.5 mg / L or the C / N ratio is lower than (9.40 to 10.35): 1, it is necessary to add anaerobic bacteria and supplement nutrients (sucrose). After the hydrolysis treatment is completed, it flows into the sedimentation tank to collect the treated wastewater and sludge.

[0080] Example 2

[0081] Place the carbon slurry wastewater in the wastewater pool, open the gap 16mm, 0.05m 3 / 103m 3 The grid makes it operate at a speed of 0.6m / s to 1m / s, and the conductive carbon materials that are agglomerated and precipitated at the bottom are taken out.

[0082] Take 47.0g / L of pretreated carbon-coated slurry wastewater and add 0.006 times the mass of carbon-coated slurry wastewater under stirring at 500r / min. The density is 0.8g / cm 3 After stirring for 30 minutes, the kerosene aggregates the conductive carbon materials floating and dispersed in the wastewater. After standing for 10 minutes, the layers are separated and then the first treatment liquid, kerosene and conductive carbon materials are obtained. According to the mass ratio of 1:1, the conductive carbon material is soaked in tetrachloroethylene for 15 minutes to remove the kerosene on the surface of the conductive carbon material. Finally, it is taken out and dried at 180℃ for 45 minutes to obtain the conductive carbon material for further use.

[0083] The first treatment liquid is placed in a reactor, and the temperature is raised to 220°C to reach the boiling point of polyvinyl pyrrolidone, so as to realize the process of polyvinyl pyrrolidone from liquid to gaseous state, and its vapor is collected and liquefied to obtain polyvinyl pyrrolidone. The remaining liquid in the reactor is the second treatment liquid.

[0084] According to the mass ratio of 1:2, 95wt% of alcohol was added to the second treatment liquid, and the mixture was stirred evenly, so that white floccules were precipitated. After filtering, carboxymethyl cellulose and the third treatment liquid were obtained.

[0085] Then the third treatment liquid is introduced into the anaerobic tank for pretreatment and screening, and then enters the reaction tank for contact to hydrolyze the organic matter in the third treatment liquid. The addition amount of the strain and the third treatment liquid is 100g:1m3. The strain is diluted with water at a ratio of 1:10, and 1 kg of sucrose is added and stirred evenly. After standing for 1 to 2 hours, it is mixed in the contact reaction tank with the third treatment liquid for a series of hydrolysis steps. Anaerobic treatment requires sufficient reaction metabolism, so the shortest time is 2 to 3 months, and the survival period of anaerobic bacteria is 3 months. Therefore, according to the specific situation, the dissolved oxygen is constantly tested. If the dissolved oxygen is not between 0.2mg / L and 0.5mg / L or the C / N ratio is lower than the range of (9.40 to 10.35):1, it is necessary to add anaerobic bacteria and supplement nutrients (sucrose). After the hydrolysis treatment is completed, it flows into the sedimentation tank to collect the treated wastewater and sludge.

[0086] Example 3

[0087] Place the carbon slurry wastewater in the wastewater pool, open the gap 16mm, 0.05m 3 / 103m 3 (Grille / wastewater) The grate makes it operate at a speed of 0.6m / s to 1m / s, and the conductive carbon materials that are agglomerated and precipitated at the bottom are taken out.

[0088] Take 47.0g / L of pretreated carbon-coated slurry wastewater and add 0.006 times the mass of carbon-coated slurry wastewater under stirring at 500r / min. The density is 0.8g / cm 3 After stirring for 30 minutes, the kerosene aggregates the conductive carbon materials floating and dispersed in the wastewater. After standing for 10 minutes, the layers are separated and then the first treatment liquid, kerosene and conductive carbon materials are obtained. According to the mass ratio of 1:1, the conductive carbon material is soaked in tetrachloroethylene for 15 minutes to remove the kerosene on the surface of the conductive carbon material. Finally, it is taken out and dried at 180℃ for 45 minutes to obtain the conductive carbon material for further use.

[0089] The first treatment liquid is placed in a reactor, and the temperature is raised to 220°C to reach the boiling point of polyvinyl pyrrolidone, so as to realize the process of polyvinyl pyrrolidone from liquid to gaseous state, and its vapor is collected and liquefied to obtain polyvinyl pyrrolidone. The remaining liquid in the reactor is the second treatment liquid.

[0090] 36% wt hydrochloric acid was added to the second treatment liquid until the pH value was 2, and the mixture was stirred evenly at a speed of 300 r / min for 15 min. The waste liquid was layered and a white solid was precipitated. After filtration, carboxymethyl cellulose and the third treatment liquid were obtained.

[0091] Add the prepared 20wt% NaOH to the third treatment liquid until the pH is 7, so that the third treatment liquid is neutralized and also creates a breeding environment for subsequent anaerobic bacteria. Then the third treatment liquid is introduced into the anaerobic tank for pretreatment and screening, and then enters the reaction tank for contact to hydrolyze the organic matter in the third treatment liquid. The ratio of the added amount of bacteria to the third treatment liquid is 100g: 1m 3 , dilute the strain with water at 1:10, add 1 kg of sucrose and stir evenly, let it stand for 1 to 2 hours, and then mix it in the contact reaction tank with the third treatment liquid to carry out a series of hydrolysis steps. Anaerobic treatment requires sufficient reaction metabolism, so the shortest time is 2 to 3 months, and the survival period of anaerobic bacteria is 3 months, so according to the specific situation, the dissolved oxygen is tested from time to time. If the dissolved oxygen is not between 0.2 mg / L and 0.5 mg / L or the C / N ratio is lower than (9.40 to 10.35): 1, it is necessary to add anaerobic bacteria and supplement nutrients (sucrose). After the hydrolysis treatment is completed, it flows into the sedimentation tank to collect the treated wastewater and sludge.

[0092] Comparative Example

[0093] Place the carbon slurry wastewater in the wastewater pool, open the gap 16mm, 0.05m 3 / 103m 3 The grid makes it operate at a speed of 0.6m / s to 1m / s, and the conductive carbon materials that are agglomerated and precipitated at the bottom are taken out.

[0094] Then the third treatment liquid is introduced into the anaerobic tank for pretreatment and screening, and then enters the reaction tank for contact to hydrolyze the organic matter in the third treatment liquid. The addition amount of the strain and the third treatment liquid is 100g:1m3. The strain is diluted with water at a ratio of 1:10, and 1 kg of sucrose is added and stirred evenly. After standing for 1 to 2 hours, it is mixed in the contact reaction tank with the third treatment liquid for a series of hydrolysis steps. Anaerobic treatment requires sufficient reaction metabolism, so the shortest time is 2 to 3 months, and the survival period of anaerobic bacteria is 3 months. Therefore, according to the specific situation, the dissolved oxygen is constantly tested. If the dissolved oxygen is not between 0.2mg / L and 0.5mg / L or the C / N ratio is lower than the range of (9.40 to 10.35):1, it is necessary to add anaerobic bacteria and supplement nutrients (sucrose). After the hydrolysis treatment is completed, it flows into the sedimentation tank to collect the treated wastewater and sludge.

[0095] Test Example 1

[0096] The pH value, COD and suspended solids of the treated wastewater obtained in Examples 1 to 3 and the comparative example were tested respectively. For the pH value test, the pH meter only needs to be placed in the treated wastewater and allowed to stand until the value is stable and does not fluctuate, and then it can be recorded and analyzed; for the COD test, the digestion instrument needs to be adjusted to the COD digestion mode in advance, and 2 ml of distilled water is first added to one of the tubes, and 2 ml of the water sample to be tested is added to the rest. The 5 reagent tubes are shaken up and down for digestion. After digestion, the COD item of the measuring instrument is selected for testing after cooling, and the final measurement data is saved and recorded; the suspended solids test uses the HX-T suspended solids water quality measuring analyzer, and a blank group is prepared. Distilled water is added to 2 / 3 of the cuvette to calibrate the instrument first, and then cuvettes filled with 2 / 3 of the water sample are placed in them for test readings. The results are shown in Table 1 below.

[0097] Table 1

[0098] pH COD Suspended matter Example 1 7.01 85.1mg / L 60mg / L Example 2 7.01 80.6mg / L 53mg / L Example 3 6.77 80.7mg / L 52mg / L Comparative Example 6.23 97.0mg / L 75mg / L

[0099] Table 2: Water pollution emission limits for existing enterprises

[0100]

[0101] Combining Table 1 and Table 2, it can be seen that the COD and suspended solids indicators of the carbon-coated slurry wastewater treated by the treatment methods of Examples 1 to 3 can meet the discharge standards.

[0102] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for treating carbon-coated slurry wastewater, characterized in that: The steps include: Providing carbon-coated slurry wastewater and pre-treating the carbon-coated slurry wastewater, wherein the carbon-coated slurry wastewater includes a conductive carbon material, a dispersant and a binder; Adding oil to the previously treated carbon-coated slurry wastewater, mixing thoroughly so that the conductive carbon material is absorbed into the oil and agglomerated, then standing to separate and separate, to obtain a first treatment liquid and a mixture, wherein the mass ratio of the carbon-coated slurry wastewater to the oil is 1:0.003-0.006; The first treatment liquid is placed in a reactor and sealed, and then the temperature in the reactor is raised to a temperature higher than the boiling point of the dispersant, and the dispersant in the first treatment liquid in the reactor is turned into steam, and the steam is collected and liquefied to obtain the dispersant, and the remaining liquid in the reactor is the second treatment liquid; A treatment agent is added to the second treatment liquid, and the binder is precipitated after sufficient mixing, and a third treatment liquid and the binder are obtained after separation.

2. The method for treating carbon-coated slurry wastewater according to claim 1, characterized in that: The dispersant is polyvinyl pyrrolidone; The operation of subsequently increasing the temperature in the reactor to a temperature higher than the boiling point of the dispersant is as follows: the temperature in the reactor is subsequently increased to 220°C.

3. The method for treating carbon coating slurry wastewater according to claim 1, characterized in that: The oil has a density of 0.8 g / cm 3 of kerosene.

4. The method for treating carbon coating slurry wastewater according to claim 3, characterized in that: The method further comprises the following operations: uniformly mixing the mixture and tetrachloroethylene at a mass ratio of 1:1, and then filtering and retaining the filter residue, wherein the filter residue is the conductive carbon material.

5. The method for treating carbon coating slurry wastewater according to claim 1, characterized in that: The binder is carboxymethyl cellulose; The operation of adding a treatment agent to the second treatment liquid and allowing the binder to precipitate after sufficient mixing is as follows: adding alcohols to the second treatment liquid so that the mass concentration of the alcohols in the mixed system is not less than 60%, allowing the binder to precipitate after sufficient mixing, and obtaining a third treatment liquid and the binder after separation.

6. The method for treating carbon coating slurry wastewater according to claim 5, characterized in that: The alcohol is ethanol.

7. The method for treating carbon coating slurry wastewater according to claim 1, characterized in that: The binder is carboxymethyl cellulose; The operation of adding a treatment agent to the second treatment liquid and allowing the binder to precipitate after sufficient mixing is as follows: adding an acid to the second treatment liquid so that the pH in the mixed system is not higher than 2, allowing the binder to precipitate after sufficient mixing, and obtaining a third treatment liquid and the binder after separation.

8. The method for treating carbon coating slurry wastewater according to claim 7, characterized in that: The acid is hydrochloric acid.

9. The method for treating carbon coating slurry wastewater according to any one of claims 1 to 8, characterized in that: The pre-treatment operation of the carbon-coated slurry wastewater is as follows: the carbon-coated slurry wastewater is screened with a grid reverse scooping screen, wherein the grid gap of the grid reverse scooping screen is 16 mm, and the specification of the grid reverse scooping screen is 0.05 m 3 / 103m 3 The screening flow rate is 0.6m / s~1.0m / s.

10. The method for treating carbon coating slurry wastewater according to any one of claims 1 to 8, characterized in that: The method further includes the following operations: removing or rendering harmless the treatment agent in the third treatment liquid, and then adding bacteria to perform fermentation treatment.

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