Advanced treatment system for semi-coke wastewater
Through the deep treatment system of orchid wastewater, combined with oil removal, evaporation, deacidification, deaminolysis, deep phenol recycling and biochemical treatment, the problems of equipment blockage and environmental risks in orchid wastewater treatment are solved, and efficient resource recycling and low-cost operation are achieved.
Patent Information
- Application Number
- CN202421966098.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-14
AI Technical Summary
The existing orchid wastewater treatment methods have problems such as equipment blockage, high operating costs, high environmental risks, and low purity of recovered substances. The traditional process has poor stability and cannot effectively remove suspended pollutants and oily substances, which affects the subsequent treatment efficiency and economic value.
The oil removal unit, evaporation separation unit, deacidification and deamination unit, deep recovery phenol unit and biochemical unit are used, combined with membrane treatment, and through multi-effect evaporator and resin adsorption and crude phenol distillation device, oils and acidic substances are removed, ammonia water and crude phenol are recovered, and the biochemical unit is used to improve the degradation efficiency of organic matter, and the wastewater is further purified by resin adsorption and membrane treatment.
It has achieved efficient resource recycling of orchid wastewater, improved the purity of ammonia and crude phenols, reduced environmental risks and operating costs, simplified process flow, reduced equipment blockage and chemical use, and improved the economic and environmental benefits of the enterprise.
Smart Images
Figure CN223150409U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of semi-coke wastewater treatment, and particularly relates to a deep treatment system for semi-coke wastewater. Background Technique
[0002] In the industrial production processes such as coal chemical industry and coking chemistry, the wastewater containing pollutants such as phenol and ammonia is called phenol-ammonia wastewater. Due to its high concentration, complex components and strong toxicity, it is difficult to treat phenol-ammonia wastewater, and the discharged pollutants cause great harm to the environment.
[0003] The conventional processes for semi-coke wastewater treatment include gravity oil removal, acid stripping and ammonia distillation, extraction and phenol removal, biochemical treatment, deep treatment, etc. The ammonia in the wastewater is mainly obtained as an ammonia water product with a concentration of 18 - 22% through "three-stage partial condensation + ammonia purification + ammonia absorption", and the crude phenol is recovered through the recycling of the extractant. The traditional semi-coke wastewater treatment methods can partially recover the phenol-ammonia pollutants in the semi-coke wastewater, but there are problems such as poor stability of the treatment system and large fluctuations in the effluent water quality indicators, which are specifically manifested as follows: 1. The traditional semi-coke wastewater treatment method directly enters the subsequent acid stripping and ammonia distillation tower only after gravity oil removal or air flotation oil removal, and cannot remove pollutants such as suspended coke powder, coal powder, and tar gum in the wastewater, resulting in these pollutants entering the subsequent treatment processes, causing blockage and wear of the equipment; 2. In the traditional extraction and phenol removal process, a cooler is set before entering the extraction tower. After heating in the acid stripping and ammonia distillation tower, polymerized oil pollution will be generated, and after heat exchange and temperature reduction, the oil will precipitate from the system, and the large pieces of oil pollution often block the cooler, resulting in low heat exchange efficiency, reduced extraction efficiency, shortened operation cycle of the extraction device, and increased maintenance and operation costs; 3. After pretreatment for oil removal, the pollutants in the wastewater are still high, and the ammonia water recovered by the method of "three-stage partial condensation + ammonia purification + ammonia absorption" contains certain VOCs impurities, which affects the economic value of the ammonia water; 4. The extractant belongs to dangerous goods, and the environmental risk value is high during the process of the process operation; further improvement is needed. Summary of the Invention
[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a deep treatment system for semi-coke wastewater.
[0005] The utility model adopts the following technical scheme:
[0006] A deep treatment system for semi-coke wastewater includes an oil removal unit, an evaporation and separation unit, an acid and ammonia removal unit, a deep phenol recovery unit, a biochemical unit, and a membrane treatment unit.
[0007] The oil removal unit treats the incoming semi-coke wastewater to remove the oil substances in the semi-coke wastewater.
[0008] The evaporation and separation unit is connected to the oil removal unit, and separates the light and heavy components of the incoming semi-coke wastewater to further recover the tar substances in the semi-coke wastewater.
[0009] The deacidification and deamination unit, connected to the evaporation separation unit, performs deacidification and deamination treatment on the incoming semi-coke wastewater, and obtains deaminated wastewater after recovering ammonia water;
[0010] The deep phenol recovery unit, connected to the deacidification and deamination unit, performs dephenolization treatment on the incoming deaminated wastewater to obtain dephenolized water;
[0011] The biochemical unit performs biochemical treatment on the incoming dephenolized water, including a hydrolysis acidification tank and an aerobic tank connected in sequence;
[0012] The membrane treatment unit, connected to the aerobic tank, treats the incoming wastewater to further remove the refractory organic matter in the semi-coke wastewater, including a membrane treatment device, a first reflux pipe connected between the membrane treatment device and the hydrolysis acidification tank for transporting sludge, a second reflux pipe connected between the membrane treatment device and the aerobic tank for transporting sludge, a first reflux pump provided on the first reflux pipe, and a second reflux pump provided on the second reflux pipe.
[0013] Furthermore, the deep phenol recovery unit includes a resin adsorption tank, a resin desorption tank, a crude phenol distillation device, and a recovery tank. The resin adsorption tank is connected to the deacidification and deamination unit to perform dephenolization treatment on the incoming deaminated wastewater; the resin desorption tank is connected to the resin adsorption tank to perform desorption treatment on the resin adsorption tank; the crude phenol distillation device is connected to the resin adsorption tank to perform evaporation treatment on the desorbed liquid after desorption treatment to obtain crude phenol; the recovery tank is connected to the crude phenol distillation device to recover the salt concentrate obtained by the treatment of the crude phenol distillation device.
[0014] Furthermore, the deep phenol recovery unit further includes a return water pipe connected between the crude phenol distillation device and the resin adsorption tank for transporting steam.
[0015] Furthermore, the oil removal unit includes an oil removal tank and a precision filter connected in sequence.
[0016] Furthermore, a pusher is provided in the hydrolysis acidification tank.
[0017] Furthermore, an aeration and agitation assembly is provided in the aerobic tank.
[0018] Furthermore, the evaporation separation unit is a multi-effect evaporator or an MVR evaporator.
[0019] Furthermore, the deacidification and deamination unit adopts a deacidification and deamination tower.
[0020] As described above for the present utility model, compared with the prior art, the beneficial effects of the present utility model are as follows: This application innovates the technologies of processes such as ammonia removal and phenol removal from semi-coke wastewater, can effectively recover the recyclable resources in the wastewater, ensure the purity of the recovered ammonia water and crude phenol, and at the same time, the treated wastewater can be reused in the water-consuming processes of semi-coke production, improving the economic, environmental and social benefits of the enterprise; among them, resin adsorption is combined with a crude phenol distillation device to effectively recover crude phenol, avoid the use of dangerous substances in the extraction process, and reduce the environmental risk of the process;
[0021] The biochemical unit includes a hydrolysis acidification tank and an oxidation tank. There are suspended fillers and activated sludge in the oxidation tank. The suspended spherical fillers have the characteristics of high porosity and high specific surface area, which can provide a good environment for microorganisms. The active microorganisms attached to the suspended fillers and the microorganisms in the activated sludge are jointly used to degrade the organic pollutants in the water, improving the biochemical treatment speed of semi-coke wastewater;
[0022] No additional chemical substances are added in the overall treatment process, reducing the harmful effects of salts in the biochemical treatment unit on organisms; and the process flow is simple, the operation to meet the standards is reliable, the project investment is reasonable, the floor area is small, and the operation cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 is a schematic flow diagram of the present utility model;
[0024] In the figure, 1 - oil removal unit, 2 - evaporation separation unit, 3 - deacidification and deammoniation unit, 4 - deep recovery phenol unit, 5 - biochemical unit, 6 - membrane treatment unit, 11 - oil removal tank, 12 - precision filter, 41 - resin adsorption tank, 42 - resin desorption tank, 43 - crude phenol rectification device, 44 - recovery tank, 45 - return water pipe, 51 - hydrolysis acidification tank, 52 - aerobic tank, 61 - membrane treatment device, 62 - first reflux pipe, 63 - second reflux pipe, 64 - first reflux pump, 65 - second reflux pump. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] The following further describes the present utility model through specific embodiments.
[0026] Referring to Figure 1 as shown, a deep treatment system for semi-coke wastewater includes an oil removal unit 1, an evaporation separation unit 2, a deacidification and deammoniation unit 3, a deep recovery phenol unit 4, a biochemical unit 5 and a membrane treatment unit 6.
[0027] The oil removal unit 1 treats the incoming semi-coke wastewater to remove the oil substances in the semi-coke wastewater, including an oil removal tank 11 and a precision filter 12 connected in sequence. By defining the composition of the oil removal unit 1, the oil removal tank 11 and the precision filter 12 are used in cooperation to perform two-stage oil removal on the semi-coke wastewater, so as to remove and recover the oil substances in the semi-coke wastewater to the greatest extent, and effectively control the fouling of coke powder, coal powder, and tar in the semi-coke wastewater to subsequent devices.
[0028] The evaporation separation unit 2 is connected to the oil removal unit 1 to separate the light and heavy components of the incoming semi-coke wastewater, further recover the tar substances in the semi-coke wastewater, and separate substances such as light components to ensure the purity of the subsequent crude phenol; specifically, the evaporation separation unit 2 uses a multi-effect evaporator or an MVR evaporator.
[0029] The deacidification and deammoniation unit 3 is connected to the evaporation separation unit 2 to perform deacidification and deammoniation treatment on the incoming semi-coke wastewater, and obtain deammoniated wastewater after recovering ammonia water. Specifically, the deacidification and deammoniation unit 3 uses a deacidification and deammoniation tower, and the number of trays of the deacidification and deammoniation tower is 30 - 45, and the deammoniation membrane is placed on the trays with the number of trays being 8 - 15; during operation, the deammoniation membrane is connected to the outside, and vacuum is continuously pumped during the process, and the generated ammonia vapor can pass through the membrane and form 18 - 20% ammonia water after being absorbed by water; among them, the top pressure of the deacidification and deammoniation tower is 0.35 - 0.62 Mpa, the bottom pressure is 0.4 - 0.75 Mpa, the top temperature is 50 - 80 °C, the bottom temperature is 140 - 155 °C, and the reflux ratio is 3 - 5. In the deacidification and deammoniation tower, acidic substances such as hydrogen sulfide dissolved in the semi-coke wastewater are quickly and efficiently removed through stripping, and ammonia dissolved in the semi-coke wastewater is quickly and efficiently removed through stripping; further, the vacuum degree of the deammoniation membrane is 0.03 MPa - 0.08 MPa, and alkali is added during operation to maintain the pH of the wastewater at 10 - 12, and the types of alkali can be divided into sodium hydroxide or potassium hydroxide.
[0030] The deep phenol recovery unit 4 is connected to the deacidification and deamination unit 3 to perform phenol removal treatment on the incoming deaminated wastewater to obtain de-phenolized water. It includes a resin adsorption tank 41, a resin desorption tank 42, a crude phenol distillation device 43, a recovery tank 44, and a return water pipe 45. The resin adsorption tank 41 is connected to the deacidification and deamination unit 3 to perform phenol removal treatment on the incoming deaminated wastewater. The resin desorption tank 42 is connected to the resin adsorption tank 41 to perform desorption treatment on the resin adsorption tank 41. The crude phenol distillation device 43 is connected to the resin adsorption tank 42 to perform evaporation treatment on the desorbed liquid after desorption treatment to obtain crude phenol. The recovery tank 44 is connected to the crude phenol distillation device 43 to recover the salt concentrate obtained by the treatment of the crude phenol distillation device 43. The return water pipe 45 is connected between the crude phenol distillation device 43 and the resin adsorption tank 41 to re-transport the water vapor obtained by the treatment of the crude phenol distillation device 43 to the resin adsorption tank 41 to be mixed with the incoming deaminated waste liquid for phenol removal treatment. There is a small amount of phenol in the water vapor, which is returned to the resin adsorption tank for treatment to reduce waste of resources. Specifically, the flow rate of resin adsorption is 1.5 - 3.5 BV / h; resin desorption uses 3% - 7% alkali with a flow rate of 2 - 4 BV / h. The desorbed liquid is recycled and can be discharged regularly and new desorbed liquid can be supplemented. After alkali desorption, it is washed with clean water, and hydrochloric acid needs to be added during the clean water washing process to ensure that the pH of the wastewater after resin washing is between 7 - 9. The discharged desorbed liquid is acidified and then enters the crude phenol distillation device 43 for crude phenol separation. Further, the alkali can be sodium hydroxide or potassium hydroxide.
[0031] The biochemical unit 5 performs biochemical treatment on the incoming de-phenolized water, including a hydrolysis acidification tank 51 and an aerobic tank 52 connected in sequence. Specifically, a propeller is installed in the hydrolysis acidification tank 51 to stir the sludge to enhance the mixing of mud and water while ensuring that the dissolved oxygen in the tank is in an anoxic state. The aerobic tank 52 is evenly filled with a large amount of biological suspension fillers, and microorganisms can form a biofilm on the surface of the fillers. At the same time, an aeration and stirring component is installed at the bottom of the aerobic tank 52 to maintain the dissolved oxygen in the water at 2 - 4 mg / L. Using the gas rising stirring and mixing effect, the suspended fillers and activated sludge in the tank are mixed more evenly with the water. The gas stirring effect can effectively wash the aged biofilm on the surface of the fillers, promote the renewal of the biofilm, and maintain a high activity of the biofilm.
[0032] The membrane treatment unit 6 is connected to the aerobic tank 52 to treat the incoming wastewater to further remove the refractory organic matter in the semi-coke wastewater, including a membrane treatment device 61, a first reflux pipe 62 connected between the membrane treatment device 61 and the hydrolysis acidification tank 51 for transporting sludge, a second reflux pipe 63 connected between the membrane treatment device 61 and the aerobic tank 52 for transporting sludge, a first reflux pump 64 provided on the first reflux pipe 62, and a second reflux pump 65 provided on the second reflux pipe 63; specifically, the membrane treatment device 61 adopts a hollow fiber membrane form to further deeply remove the refractory organic matter in the wastewater and maintain a high concentration of sludge; by setting the first reflux pump 64, the second reflux pump 65 in cooperation with the first reflux pipe 62 and the second reflux pipe 63, part of the sludge in the membrane treatment unit 6 is refluxed to the hydrolysis acidification tank 51 and the aerobic tank 52 to maintain the sludge concentration in the biochemical unit 5; the excess sludge is discharged into the sludge thickening tank.
[0033] This application innovates the technologies of processes such as ammonia removal and phenol removal in semi-coke wastewater, can effectively recover the recyclable resource substances in the wastewater, ensure the purity of the recovered ammonia water and crude phenol, and at the same time, the wastewater can be reused in the water-consuming processes of semi-coke production after treatment, improving the economic, environmental and social benefits of the enterprise; among them, the resin adsorption is combined with the crude phenol distillation device 43 to effectively recover the crude phenol, avoid using dangerous substances in the extraction process, and reduce the environmental risk of the process; no additional chemical substances are added in the overall treatment process, reducing the harmful effect of salts in the biochemical treatment unit on organisms; and the process flow is simple, the operation to meet the standards is reliable, the project investment is reasonable, the floor area is small, and the operation cost is low.
[0034] The above is only the preferred embodiment of the present invention, and thus cannot limit the scope of implementation of the present invention. That is, the equivalent changes and modifications made according to the scope of the present invention application and the content of the specification should still fall within the scope covered by the present invention application.
Claims
1. A deep treatment system for semi-coke wastewater, characterized in that: It includes an oil removal unit, an evaporation separation unit, a deacidification and deammoniation unit, a unit for deeply recovering phenol, a biochemical unit and a membrane treatment unit. The oil removal unit treats the incoming semi-coke wastewater to remove oil substances in the semi-coke wastewater. The evaporation separation unit, connected to the oil removal unit, separates light and heavy components of the incoming semi-coke wastewater to further recover tar substances in the semi-coke wastewater. The deacidification and deammoniation unit, connected to the evaporation separation unit, performs deacidification and deammoniation treatment on the incoming semi-coke wastewater, and obtains deammoniated wastewater after recovering ammonia water. The unit for deeply recovering phenol, connected to the deacidification and deammoniation unit, performs phenol removal treatment on the incoming deammoniated wastewater to obtain phenol-removed water. The biochemical unit performs biochemical treatment on the incoming phenol-removed water, including a hydrolysis acidification tank and an aerobic tank connected in sequence. The membrane treatment unit, connected to the aerobic tank, treats the incoming wastewater to further remove refractory organic matters in the semi-coke wastewater, including a membrane treatment device, a first reflux pipe connected between the membrane treatment device and the hydrolysis acidification tank for transporting sludge, a second reflux pipe connected between the membrane treatment device and the aerobic tank for transporting sludge, a first reflux pump provided on the first reflux pipe, and a second reflux pump provided on the second reflux pipe.
2. The advanced treatment system for semi-coke wastewater according to claim 1, wherein: The unit for deeply recovering phenol includes a resin adsorption tank, a resin desorption tank, a crude phenol distillation device and a recovery tank. The resin adsorption tank is connected to the deacidification and deammoniation unit to perform phenol removal treatment on the incoming deammoniated wastewater; the resin desorption tank is connected to the resin adsorption tank to perform desorption treatment on the resin adsorption tank; the crude phenol distillation device is connected to the resin adsorption tank to perform evaporation treatment on the desorbed liquid after desorption treatment to obtain crude phenol; the recovery tank is connected to the crude phenol distillation device to recover the salt concentrate obtained by the treatment of the crude phenol distillation device.
3. The advanced treatment system for semi-coke wastewater according to claim 2, wherein: The unit for deeply recovering phenol further includes a return water pipe connected between the crude phenol distillation device and the resin adsorption tank for transporting water vapor.
4. The advanced treatment system for semi-coke wastewater according to claim 2, characterized in that: The oil removal unit includes an oil removal tank and a precision filter connected in sequence.
5. The advanced treatment system for semi-coke wastewater according to claim 1, wherein: A pusher is provided in the hydrolysis acidification tank.
6. The advanced treatment system for semi-coke wastewater according to claim 1, characterized in that: An aeration and stirring assembly is provided in the aerobic tank.
7. The deep treatment system for semi-coke wastewater according to claim 1, wherein: The evaporation separation unit is a multi-effect evaporator or an MVR evaporator.
8. The advanced treatment system for semi-coke wastewater according to claim 1, characterized in that: The deacidification and deammoniation unit adopts a deacidification and deammoniation tower.