Recycling comprehensive treatment system for low-concentration phenolic wastewater

Abstract

The invention provides a low-concentration phenol-containing wastewater recycling comprehensive treatment system, and belongs to the technical field of resource recycling. According to the method, phenol and water in the phenol-containing wastewater are separated through an adsorption and desorption cyclic utilization technology of an adsorbent, so that the phenol content of effluent is less than 0.3 mg / L, CODlt; and meanwhile, the phenolate of the desorption liquid is further recovered, so that the aim of recycling the resources of water, phenol and the adsorbent is fulfilled. According to the system, the phenol-containing wastewater is firstly pretreated, phenol and water are separated through adsorption of the adsorbent, the effluent reaches the reuse index requirement, and the phenol is converted into phenate by using a special desorption agent to be used as a phenol preparation raw material to realize recycling. Compared with a traditional dephenolization process, the method has more obvious advantages, the wastewater treatment cost is greatly reduced while resource recycling is achieved through resource recycling of water, phenol and the adsorbent, and the method has extremely high economic value.

Description

Technical Field

[0001] The present invention is applicable to the technical field of wastewater resource recycling treatment, and more specifically is a comprehensive resource treatment system for low-concentration phenol-containing wastewater. Background Art

[0002] Phenol compounds are important organic chemical raw materials in the production process of coal chemical industry and petroleum processing. A large amount of phenolic wastewater is generated in industrial production or when phenolic production equipment is repaired, residual or leaked phenolic compounds are discharged into the environment due to improper treatment, resulting in an increasing amount of phenol in the rainwater around the production. With the advancement of the production process, the sources of phenolic wastewater are very wide. Therefore, it is very important to find a treatment method that can efficiently separate phenolic compounds in phenolic wastewater.

[0003] The existing phenol-containing wastewater treatment method can refer to the patent with publication number CN117486392A, which discloses a method of using a solid adsorbent to remove phenolic substances and COD in wastewater through a regeneration process of an adsorption unit and recycling of a catalyst, thereby obtaining treated wastewater with a phenol content of <0.5 mg / L and a COD of <500 mg / L. Although the phenol content in the effluent of this method is as low as 0.5 mg / L, it still does not reach below 0.3 mg / L, and the COD index in the water is relatively high and cannot be fully utilized as a resource.

[0004] CN114956243A discloses a method of using organic bentonite to adsorb phenolic substances in wastewater to achieve the purpose of removing phenolic organic matter in water, with a removal rate of up to 96%-99%. Then, a desorbent is used to desorb the phenolic organic matter adsorbed on the bentonite to regenerate the adsorption material. However, this method is only applicable to phenol concentrations of 1000-3000 mg / L, and the effluent index reaches 20 ppm, and the effluent cannot be recycled.

[0005] CN101209957B discloses a phenol-containing wastewater extraction and recovery technology, wherein an extraction method is used to recover organic phenols in water, the extractant is an amide ion solution, the extraction temperature is 10-50°C, the extraction time is 1-5h, the extraction rate is 80%-96%, the extraction conditions are relatively harsh, the extraction efficiency and extraction rate are low, and a small part of the extractant will dissolve in the water, causing the components in the water to be further complicated, increasing the difficulty of subsequent treatment. The method is a scheme for extracting phenols from 0.5mg / L low-concentration phenol-containing wastewater, and the phenol is processed to 0.3mg / L, but the extraction of wastewater with high phenol content cannot meet the standard and the solvent consumption is large. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a comprehensive resource treatment system for low-concentration phenol-containing wastewater, which separates phenol and water in the wastewater through a circulating treatment device of adsorbent adsorption and acid-base desorption to achieve resource recycling. The method has the advantages of efficient wastewater treatment, easy operation and low operating cost.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A low-concentration phenol-containing wastewater resource comprehensive treatment system, comprising:

[0009] A raw water pool for phenol-containing wastewater, which at least includes a pool body and inlet and outlet pipes;

[0010] A pretreatment device, the input end of which is connected to the output end of the raw water pool of the phenol-containing wastewater;

[0011] The acidity regulating device, whose output end is connected to the phenol wastewater adsorption device, can regulate the acidity of the phenol-containing wastewater;

[0012] a phenol wastewater adsorption device, which is connected to the output end of the pretreatment device;

[0013] A desorbent filling device, the output end of which is connected to the phenol water desorption device to perform cyclic desorption on the adsorbent after adsorption saturation;

[0014] A phenol water desorption device, the input end of which is connected to the output end of the phenol wastewater adsorption device;

[0015] A produced water reuse device is connected to the output end of the phenol wastewater adsorption device.

[0016] An adsorption water production tank, which is connected to the output end of the phenol wastewater adsorption device;

[0017] Preferably, the raw water pool for phenol-containing wastewater further includes a grid, a liquid level meter, and a ventilation system.

[0018] Preferably, the grille is used to intercept larger solid debris to prevent clogging of subsequent processing equipment; the liquid level meter is used to monitor the liquid level of wastewater in the raw water pool containing phenolic wastewater so as to adjust the progress of wastewater treatment in time; the ventilation system is used to remove harmful gases that may be produced by the wastewater to ensure a safe working environment.

[0019] Preferably, the pretreatment device is used to remove and filter oil and suspended matter in the wastewater to preliminarily reduce the turbidity in the water.

[0020] Preferably, the sludge thickening equipment in the pretreatment device is used to reduce the moisture content in the sludge, reduce the sludge volume, and reduce the load for subsequent treatment.

[0021] Preferably, the sludge dewatering equipment in the pretreatment device is used to further remove moisture from the sludge so that the sludge reaches a state that is convenient for transportation and disposal.

[0022] Preferably, the pretreatment device detects and observes that the phenol-containing wastewater contains soluble oil, further removes the oil content and simultaneously reduces turbidity.

[0023] Preferably, the acidity regulating device is stored in a storage tank, and a filling pump delivers the acidity regulator to be distributed according to the pH value. The acid can be citric acid, sulfuric acid, hydrochloric acid, nitric acid, acetic acid, carbonic acid, phosphoric acid, etc.

[0024] Preferably, the phenol wastewater adsorption device at least includes an adsorption tank body, which is provided with a phenol-containing wastewater inlet, an acid adjustment inlet, a water outlet, a dephenolizing agent outlet and a desorbent inlet; an adsorbent module, which is placed in the adsorption tank body and is made of a specific porous adsorption material, and has a high adsorption capacity and selectivity for phenolic substances; a liquid distributor, which is connected to the phenol-containing liquid inlet and can evenly distribute the phenol-containing liquid on the adsorbent module. An intelligent control system, which connects various components, can automatically control the adsorption and regeneration process and parameters such as flow rate and temperature.

[0025] Preferably, the desorbent filling device is provided with a storage tank, a filling pump, etc., and the desorption liquid can be calcium hydroxide, ammonia water, sodium hydroxide, potassium hydroxide, etc.

[0026] Preferably, the phenol water desorption device at least includes a desorption tank, which is provided with an inlet connected to the phenol-containing wastewater, so that the phenol-containing wastewater can be evenly distributed on the adsorbent module, a phenol-containing material inlet, a desorbent inlet, a concentrated phenol solution outlet and a phenol-containing desorption liquid outlet, and the desorption tank has a built-in liquid distributor to ensure that the desorbent is uniform and efficient; a separation device, connected to the phenol-containing desorption liquid outlet, and separating the desorption liquid into a concentrated phenol solution and a reusable desorbent through a separation technology; a reuse system, connected to the desorbent outlet of the separation device, and capable of purifying the desorbent and returning it to the desorption tank; a control system, which can automatically monitor and regulate the temperature, pressure, flow and other parameters of the desorption tank, and record operating data for fault diagnosis and process optimization.

[0027] In the above technical scheme, the present invention provides a low-concentration phenol-containing wastewater resource comprehensive treatment system, which has the following beneficial effects:

[0028] 1. Treatment effect

[0029] Efficient removal of phenolic substances: The present invention can effectively reduce the amount of phenol in wastewater, with the phenol content of the effluent index being stably less than 0.3 mg / L and the COD being less than 20 mg / L, so that the treated effluent meets the discharge standard or reuse requirements.

[0030] Stable effluent water quality: The phenol wastewater adsorption device is configured with multiple groups of series or parallel operation modes, and an inlet pH acid adjustment device is provided in front of the adsorption device, which can be adjusted online according to the inlet water volume and phenol content to ensure the continuous and stable operation of the effluent water quality and avoid adverse effects on subsequent treatment links or receiving water bodies due to water quality fluctuations.

[0031] 2. Resource recycling

[0032] Recycling of adsorbents: By setting up the adsorption and desorption processes, the adsorbents can be recycled to reduce operating costs.

[0033] Realize the recovery of phenolic substances: Through operations such as desorption, the adsorbed phenolic substances can be desorbed to obtain concentrated phenol solution, realizing the recovery and reuse of phenolic substances, which has certain economic value.

[0034] Recycling of water resources: The water quality of the effluent after adsorption treatment is significantly improved. The phenol content of the effluent is stably less than 0.3 mg / L and the COD is less than 20 mg / L. This can realize the recycling of water resources, improve the utilization rate of water resources, reduce the demand for fresh water resources, and reduce the water cost of the enterprise.

[0035] 3. Environmental benefits

[0036] Reduce environmental pollution risks: Phenol-containing wastewater is toxic to a certain extent. If it is directly discharged, it will cause serious pollution to the water, soil and other ecological environments, threatening the survival and health of organisms. This device can effectively remove phenolic substances in wastewater, reduce environmental pollution risks, and protect the ecological environment.

[0037] Reduce carbon emissions: Compared with some traditional phenol-containing wastewater treatment methods, the adsorption device has relatively low energy consumption during operation, which can reduce energy consumption and carbon emissions to a certain extent and has good environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0039] Figure 1 A schematic diagram of a flow chart of a cyclic processing provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] like Figure 1 As shown, a low-concentration phenol-containing wastewater resource comprehensive treatment system comprises:

[0042] A raw water pool for phenol-containing wastewater, which at least includes a pool body and inlet and outlet pipes;

[0043] A pretreatment device, the input end of which is connected to the output end of the raw water pool of the phenol-containing wastewater;

[0044] The acidity regulating device, whose output end is connected to the phenol wastewater adsorption device, can regulate the acidity of the phenol-containing wastewater;

[0045] a phenol wastewater adsorption device, which is connected to the output end of the pretreatment device;

[0046] A desorbent filling device, the output end of which is connected to the phenol water desorption device to perform cyclic desorption on the adsorbent after adsorption saturation;

[0047] A phenol water desorption device, the input end of which is connected to the output end of the phenol wastewater adsorption device;

[0048] A produced water reuse device is connected to the output end of the phenol wastewater adsorption device.

[0049] Among them, the raw water pool of phenol-containing wastewater also includes screens, liquid level meters and ventilation systems.

[0050] As a further embodiment of the present invention, the above-mentioned grille is used to intercept larger solid debris to prevent clogging of subsequent processing equipment;

[0051] Furthermore, the liquid level meter is used to monitor the liquid level of the wastewater in the collection pool so as to adjust the wastewater treatment progress in time; the ventilation system is used to remove harmful gases that may be produced by the wastewater to ensure a safe working environment.

[0052] Furthermore, in this embodiment, the oil filter device is used to filter oil in the water to preliminarily reduce the turbidity in the water. The oil filter device is a filter device in the prior art.

[0053] As a further embodiment of the present invention, the sludge thickening equipment in the sludge disposal device is used to reduce the moisture content in the sludge, reduce the sludge volume, and reduce the load for subsequent treatment, and the sludge dewatering equipment in the sludge disposal device is used to further remove moisture from the sludge, so that the sludge reaches a state that is easy to transport and dispose of.

[0054] Furthermore, since the phenol-containing wastewater contains soluble oil, a multi-effect filtering device is provided in this embodiment. Through the practical use of the multi-effect filtering device, the oil content can be further removed and the turbidity can be reduced simultaneously through detection and observation.

[0055] Furthermore, the dephenolization adsorption device at least comprises an adsorption tank body, which is provided with a phenol-containing liquid inlet, a dephenolization liquid outlet and a regeneration liquid inlet; an adsorbent module, which is placed in the adsorption tank body and is made of a specific porous adsorption material, and has a high adsorption capacity and selectivity for phenolic substances; a liquid distributor, which is connected to the phenol-containing liquid inlet and can evenly distribute the phenol-containing liquid on the adsorbent module. The above-mentioned adsorption device can operate continuously and stably to ensure the stability of the effluent water quality, avoid adverse effects on subsequent treatment links or receiving water bodies due to water quality fluctuations, and can effectively reduce the phenol content in the wastewater, so that the treated wastewater meets the discharge standard or reuse requirements;

[0056] At the same time, the phenol wastewater adsorption device is set up with multiple groups of series or parallel operation modes, and an inlet pH acid adjustment device is provided in front of the adsorption device, which can be adjusted online according to the inlet water volume and phenol content to ensure the continuous and stable operation of the effluent water quality and avoid adverse effects on subsequent treatment links or receiving water bodies due to water quality fluctuations.

[0057] Furthermore, the desorption liquid decomposition device at least includes a desorption tank, which is provided with a phenol-containing material inlet, a desorbent inlet, a concentrated phenol solution outlet and a phenol-containing desorption liquid outlet, and the desorption tank has a stirring function to ensure uniform and efficient desorption; a separation device is connected to the phenol-containing desorption liquid outlet, and the desorption liquid is separated into a concentrated phenol solution and a reusable desorbent by separation technology; through operations such as desorption, the adsorbed phenolic substances can be desorbed to obtain a concentrated phenol solution, thereby realizing the recovery and reuse of phenolic substances, which has certain economic value.

[0058] The recycling system is connected to the desorbent outlet of the separation device, and can purify the desorbent and return it to the desorption tank; it also includes a control system and a monitoring system, which can automatically monitor and control the temperature, pressure, flow and other parameters of the desorption tank, and record the operating data for fault diagnosis and process optimization;

[0059] The present invention can desorb the adsorbed phenolic substances through operations such as desorption to obtain a concentrated phenol solution, thereby realizing the recovery and reuse of the phenolic substances, which has certain economic value. The water quality of the wastewater after the adsorption treatment is significantly improved, and the recycling of water resources can be realized, the utilization rate of water resources is improved, the demand for fresh water resources is reduced, and the water cost of the enterprise is reduced.

[0060] The present invention can realize the recycling of adsorbent and reduce operating costs by setting up the adsorption and desorption processes.

[0061] Realize the recovery of phenolic substances: Through operations such as desorption, the adsorbed phenolic substances can be desorbed to obtain concentrated phenol solution, realizing the recovery and reuse of phenolic substances, which has certain economic value.

[0062] Recycling of water resources: The water quality of the effluent after adsorption treatment is significantly improved. The phenol content of the effluent is stably less than 0.3 mg / L and the COD is less than 20 mg / L. This can realize the recycling of water resources, improve the utilization rate of water resources, reduce the demand for fresh water resources, and reduce the water cost of the enterprise.

[0063] At the same time, phenol-containing wastewater has certain toxicity. If it is directly discharged, it will cause serious pollution to the ecological environment such as water bodies and soil, threatening the survival and health of organisms. The device can effectively remove phenolic substances in wastewater, reduce the risk of environmental pollution, and protect the ecological environment. Compared with some traditional phenol-containing wastewater treatment methods, the adsorption device of the present invention has relatively low energy consumption during operation, which can reduce energy consumption and carbon emissions to a certain extent, and has good environmental benefits.

[0064] The above-mentioned devices not introduced in detail are common knowledge and conventional technical means for those skilled in the art, and no further elaboration is made.

[0065] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A low-concentration phenol-containing wastewater resource comprehensive treatment system, characterized in that: include: 1) A raw water pool for phenol-containing wastewater, which at least includes a pool body and inlet and outlet pipes; 2) a pretreatment device, the input end of which is connected to the output end of the raw water pool of the phenol-containing wastewater; 3) an acidity regulating device, the output end of which is connected to the phenol wastewater adsorption device, and can regulate the acidity of the phenol-containing wastewater; 4) a phenol wastewater adsorption device, which is connected to the output end of the pretreatment device; 5) a desorbent filling device, the output end of which is connected to the phenol water desorption device to perform cyclic desorption on the adsorbent after adsorption saturation; 6) a phenol water desorption device, the input end of which is connected to the output end of the phenol wastewater adsorption device; 7) A produced water reuse device, which is connected to the output end of the phenol wastewater adsorption device.

2. A low-concentration phenol-containing wastewater resource comprehensive treatment system according to claim 1, characterized in that: The raw water pool of phenol-containing wastewater also includes a grid, a liquid level meter and a ventilation system.

3. A low-concentration phenol-containing wastewater resource comprehensive treatment system according to claim 2, characterized in that: The grid is used to intercept solid debris to prevent clogging of subsequent processing equipment; The liquid level meter is used to monitor the liquid level height of the wastewater in the raw water pool containing phenolic wastewater, and is used to adjust the progress of wastewater treatment; the ventilation system is used to remove harmful gases generated by the wastewater.

4. A low-concentration phenol-containing wastewater resource comprehensive treatment system according to claim 1, characterized in that: The pretreatment device is used to remove and filter oil and suspended matter in wastewater and preliminarily reduce turbidity in the water.

5. A low-concentration phenol-containing wastewater resource comprehensive treatment system according to claim 4, characterized in that: The pretreatment device includes a sludge thickening device for reducing the water content in the sludge, reducing the sludge volume, and reducing the load for subsequent treatment.

6. A low-concentration phenol-containing wastewater resource comprehensive treatment system according to claim 1, characterized in that: The pretreatment device also includes a sludge dewatering device, which is used to further remove moisture from the sludge so that the sludge reaches a state that is convenient for transportation and disposal.

7. A low-concentration phenol-containing wastewater resource comprehensive treatment system according to claim 1, characterized in that: The acidity regulating device is provided with a storage tank, a filling pump and an acidity regulator. The acid may be citric acid, sulfuric acid, hydrochloric acid, nitric acid, acetic acid, carbonic acid, phosphoric acid and the like.

8. A low-concentration phenol-containing wastewater resource comprehensive treatment system according to claim 1, characterized in that: The phenol wastewater adsorption device at least comprises an adsorption tank body, which is provided with a phenol-containing wastewater inlet, an acid adjustment inlet, a effluent purified water outlet, a dephenolizing agent outlet and a desorbent agent inlet; The adsorbent module is placed in the adsorption tank and is made of a specific porous adsorption material with high adsorption capacity and selectivity for phenolic substances; The liquid distributor is connected to the inlet of the phenol-containing wastewater and can evenly distribute the phenol-containing wastewater on the adsorbent module.

9. A low-concentration phenol-containing wastewater resource comprehensive treatment system according to claim 1, characterized in that: The desorbent filling device is provided with a storage tank, a filling pump, etc. The desorption liquid is calcium hydroxide, ammonia water, sodium hydroxide or potassium hydroxide.

10. A low-concentration phenol-containing wastewater resource comprehensive treatment system according to claim 1, characterized in that: The phenol water desorption device at least comprises: a desorption tank, which is provided with a phenol-containing material inlet, a desorbent inlet, a concentrated phenol solution outlet and a phenol-containing desorption liquid outlet, and the desorption tank is built-in with a liquid distributor to ensure that the desorbent is uniform and efficient; A separation device connected to the outlet of the phenol-containing desorbent, and cyclically separating the desorbent into a concentrated phenol solution and a reusable phenol salt by a separation technology; The recycling system is connected to the desorbent outlet of the phenol water desorption device, which can purify the adsorbent in the adsorption tank and concentrate the phenol salt, desorb it, and separate the purified water for recycling.

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