Pretreatment system for degrading toxicity of cephalosporin sewage and improving biodegradability
Through the pretreatment system combined with acid-base neutralization, iron-carbon reaction and flocculation and sedimentation technology, the problems of low efficiency and high cost of cephalosporin wastewater treatment in traditional treatment methods are solved, and the efficient degradation and biochemical improvement of wastewater are achieved. Subsequent biological treatment creates favorable conditions.
Patent Information
- Application Number
- CN202421081795.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-17
AI Technical Summary
The traditional wastewater treatment methods for cephalosporin production have problems such as low treatment efficiency, high operating costs and complex operations. It is difficult to effectively degrade toxic substances in wastewater and improve biochemical properties, which affects the effectiveness of the biological treatment system.
A pretreatment system for toxic degradation and biochemical improvement of cephalospore wastewater was designed. Through acid-base neutralization, iron-carbon reaction, flocculation and settlement and other technologies, combined with precise measurement and recycling, it can achieve efficient treatment of wastewater and resource recycling, including It is a combination of equipment such as wastewater collection tank, reactor, iron carbon reactor, flocculation reactor, vertical flow precipitation tank and three-effect evaporator.
It effectively reduces the toxicity and turbidity of wastewater, significantly improves its biochemical performance, creates favorable conditions for subsequent biochemical treatment, reduces treatment costs, and achieves efficient and environmentally friendly treatment of wastewater.
Smart Images
Figure CN222293853U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sewage treatment, and in particular relates to a pretreatment system for cephalosporin sewage with toxicity degradation and biochemical improvement. Background Art
[0002] Cephalosporins are widely used antibiotics for treating various bacterial infections. However, the production process of cephalosporins produces a large amount of wastewater, which has the characteristics of high COD concentration, poor biodegradability, single water quality, and toxicity. It is a difficult-to-degrade industrial wastewater. This wastewater causes serious pollution to the environment and inhibits the biological treatment system, making it difficult for traditional biochemical treatment methods to achieve the desired effect.
[0003] At present, the treatment method for cephalosporin production wastewater mainly adopts a combination of physical, chemical and biological treatment. However, traditional treatment methods have problems such as low treatment efficiency, high operating cost and complex operation. Therefore, it is necessary to develop an efficient, economical and reliable pretreatment system to degrade toxic substances in cephalosporin production wastewater, improve its biodegradability, and create favorable conditions for subsequent biological treatment. Utility Model Content
[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a pretreatment system for cephalosporin wastewater with toxicity degradation and biochemical improvement. The system realizes efficient treatment and resource recovery of cephalosporin wastewater through carefully designed treatment process and equipment configuration, which not only effectively reduces the toxicity and turbidity of the wastewater, significantly improves its biochemical performance, but also creates favorable conditions for subsequent biochemical treatment processes, effectively avoids adverse effects on the biochemical system, and thus achieves cost savings.
[0005] The utility model is realized by adopting the following technical solutions:
[0006] The cephalosporin wastewater toxicity degradation and biochemical improvement pretreatment system comprises a wastewater collection tank, a reactor, a wastewater transfer tank, an iron-carbon reactor, a flocculation reactor, a vertical flow sedimentation tank, a wastewater regulating tank and a triple-effect evaporator connected in sequence; the feed port of the reactor is respectively connected to a lime slurry feed tank and a sulfuric acid feed tank through pipelines, and the wastewater is subjected to acid-base neutralization reaction by adding lime slurry, and the pH value is adjusted to neutral to generate calcium phosphate and calcium carbonate, thereby removing phosphorus from the wastewater; the solid phase outlet of the reactor is connected to a plate-frame filter press through a pipeline, and the liquid phase outlet of the plate-frame filter press is connected to the feed port of the reactor through a pipeline The solid phase outlet of the plate and frame filter press is connected to the hazardous waste pool through a pipeline; the feeding port of the flocculation reactor is connected to the sodium hydroxide feeding tank, the PAC feeding tank and the PAM feeding tank through pipelines. By adding sodium hydroxide, PAC, PAM and other reagents, the suspended matter and colloidal particles in the wastewater are flocculated and settled to reduce the turbidity of the wastewater; the solid phase outlet of the vertical flow sedimentation tank is connected to the sludge storage tank through a pipeline, and the outlet of the sludge storage tank is connected to the inlet of the reactor through a pipeline. The vertical flow sedimentation tank can make the floccules in the wastewater settle quickly under the action of gravity and enter the sludge storage tank, and then be input into the reactor for further treatment.
[0007] The outlets of the wastewater regulating tank and the three-effect evaporator are respectively connected to the biochemical system through pipelines. According to the water quality in the wastewater regulating tank, the wastewater is selectively introduced into the three-effect evaporator for further treatment, or directly transmitted to the biochemical system for subsequent treatment.
[0008] The outlet pipelines of the lime slurry feeding tank, the sulfuric acid feeding tank, the sodium hydroxide feeding tank, the PAC feeding tank and the PAM feeding tank are respectively provided with metering pumps for accurately metering the feeding amount.
[0009] The solid phase outlet of the reactor, the outlet of the wastewater transfer tank, the solid phase outlet of the vertical flow sedimentation tank, and the liquid phase outlet pipeline of the plate and frame filter press are respectively provided with driving pumps.
[0010] Liquid level gauges are respectively arranged inside the wastewater collecting tank, the wastewater transfer tank, the wastewater regulating tank and the sulfuric acid feeding tank.
[0011] The iron-carbon reactor is provided with an iron-carbon filler and an aeration pipe, and the inlet of the aeration pipe is connected to a Roots blower, which provides aeration so that the iron-carbon filler is fully in contact with the wastewater to cause an oxidation-reduction reaction.
[0012] The outside of the reactor is provided with a cooling coil for controlling the temperature of the reactor.
[0013] The reaction kettle, lime slurry feeding tank, flocculation reactor, sodium hydroxide feeding tank, PAC feeding tank and PAM feeding tank are provided with stirring devices inside to ensure uniform reaction and improve treatment effect.
[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0015] The pretreatment system for cephalosporin wastewater toxicity degradation and biochemical improvement described in the utility model effectively reduces the toxicity of cephalosporin wastewater and improves its biochemical properties by comprehensively applying treatment technologies such as acid-base neutralization, iron-carbon reaction, and flocculation sedimentation. The stability and efficiency of the treatment process are ensured through precise metering and recycling. The system not only effectively removes phosphorus and other harmful substances in the wastewater, but also reduces the turbidity of the wastewater, creating favorable conditions for subsequent biochemical treatment. At the same time, by adjusting wastewater parameters and evaporation treatment, the wastewater treatment effect is further improved and the treatment cost is saved. Therefore, the pretreatment system provides an efficient and environmentally friendly solution for the treatment of cephalosporin wastewater, which has important application value. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of the pretreatment system for cephalosporin wastewater for toxicity degradation and biochemical improvement according to the utility model;
[0017] In the figure: 1. Wastewater collection tank; 2. Reactor; 3. Wastewater transfer tank; 4. Iron-carbon reactor; 5. Flocculation reactor; 6. Vertical flow sedimentation tank; 7. Wastewater regulating tank; 8. Three-effect evaporator; 9. Lime slurry feeding tank; 10. Sulfuric acid feeding tank; 11. Plate and frame filter press; 12. Hazardous waste pool; 13. Sodium hydroxide feeding tank; 14. PAC feeding tank; 15. PAM feeding tank; 16. Sludge storage tank; 17. Biochemical system; 18. Metering pump; 19. Drive pump; 20. Liquid level gauge; 21. Iron-carbon filler; 22. Aeration pipe; 23. Roots blower; 24. Cooling coil; 25. Stirring device. DETAILED DESCRIPTION
[0018] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.
[0019] like Figure 1As shown, the pretreatment system for toxic degradation and biochemical improvement of cephalosporin wastewater comprises a wastewater collection tank 1, a reactor 2, a wastewater transfer tank 3, an iron-carbon reactor 4, a flocculation reactor 5, a vertical flow sedimentation tank 6, a wastewater regulating tank 7 and a triple-effect evaporator 8 connected in sequence; the feed port of the reactor 2 is connected to a lime slurry feed tank 9 and a sulfuric acid feed tank 10 through pipelines, the solid phase outlet of the reactor 2 is connected to a plate and frame filter press 11 through a pipeline, the liquid phase outlet of the plate and frame filter press 11 is connected to the feed port of the reactor 2 through a pipeline, and the solid phase outlet of the plate and frame filter press 11 is connected to a hazardous waste pool 12 through a pipeline; the feed port of the flocculation reactor 5 is connected to a sodium hydroxide feed tank 13, a PAC feed tank 14 and a PAM feed tank 15 through pipelines; the solid phase outlet of the vertical flow sedimentation tank 6 is connected to a sludge storage tank 16 through a pipeline, and the outlet of the sludge storage tank 16 is connected to the inlet of the reactor 2 through a pipeline.
[0020] The outlets of the wastewater regulating tank 7 and the triple-effect evaporator 8 are connected to the biochemical system 17 through pipelines respectively.
[0021] The outlet pipelines of the lime slurry feeding tank 9 , the sulfuric acid feeding tank 10 , the sodium hydroxide feeding tank 13 , the PAC feeding tank 14 and the PAM feeding tank 15 are respectively provided with metering pumps 18 .
[0022] The solid phase outlet of the reactor 2, the outlet of the wastewater transfer tank 3, the solid phase outlet of the vertical flow sedimentation tank 6, and the liquid phase outlet pipeline of the plate and frame filter press 11 are respectively provided with a driving pump 19.
[0023] Liquid level meters 20 are respectively provided inside the wastewater collecting tank 1 , the wastewater transfer tank 3 , the wastewater regulating tank 7 and the sulfuric acid feeding tank 10 .
[0024] The iron-carbon reactor 4 is provided with an iron-carbon filler 21 and an aeration pipe 22 , and the inlet of the aeration pipe 22 is connected to a Roots blower 23 .
[0025] A cooling coil 24 is provided on the outside of the reactor 2 .
[0026] A stirring device 25 is provided inside the reaction kettle 2 , the lime slurry feeding tank 9 , the flocculation reactor 5 , the sodium hydroxide feeding tank 13 , the PAC feeding tank 14 and the PAM feeding tank 15 .
[0027] Example 1
[0028] The cephalosporin wastewater mainly comes from the aqueous phase after extraction, and its pH value is 1. The contents of various components in the wastewater are as follows: COD concentration is 90600 mg / L, NH 3-N concentration is 40mg / L, TDS concentration is 9270040mg / L, TP concentration is 3930mg / L, and TN concentration is 3000mg / L. Due to excessive addition of phosphoric acid, the TP content in the water quality is seriously exceeded, so pretreatment is required to remove phosphorus. The process scheme is neutralization + iron-carbon reaction + flocculation + biochemical.
[0029] The cephalosporin wastewater treatment process is as follows:
[0030] First, cephalosporin wastewater is collected centrally through wastewater collection tank 1 and then enters reactor 2.
[0031] In the reactor 2, appropriate amounts of lime slurry and sulfuric acid are added through accurate measurement of the lime slurry feeding tank 9 and the sulfuric acid feeding tank 10. The addition of lime slurry is used to neutralize the acidity of the wastewater, adjust the pH value to neutral, and generate calcium phosphate and calcium carbonate at the same time, effectively removing phosphorus from the wastewater. The stirring device 25 in the reactor 2 ensures that the acid-base neutralization reaction is carried out evenly, thereby improving the treatment effect.
[0032] The wastewater treated by the reactor 2 enters the wastewater transfer tank 3 for temporary storage. Subsequently, the wastewater flows into the iron-carbon reactor 4. In the iron-carbon reactor 4, an iron-carbon filler 21 and an aeration pipe 22 are provided. Aeration is provided by a Roots blower 23, so that the iron-carbon filler 21 is fully in contact with the wastewater, a redox reaction occurs, and the toxic substances in the wastewater are further degraded, thereby improving the biodegradability of the wastewater.
[0033] Next, the wastewater enters the flocculation reactor 5. Appropriate amounts of sodium hydroxide, PAC, PAM and other agents are added through precise measurement of the sodium hydroxide feed tank 13, the PAC feed tank 14 and the PAM feed tank 15. These agents cause the suspended matter and colloidal particles in the wastewater to flocculate and settle, thereby reducing the turbidity of the wastewater and improving the cleanliness of the wastewater.
[0034] The wastewater after flocculation reaction enters the vertical flow sedimentation tank 6. In the vertical flow sedimentation tank 6, the floccules in the wastewater quickly settle to the bottom under the action of gravity and are pumped into the sludge storage tank 16 through the sludge pump. The sludge in the sludge storage tank 16 can be cleaned regularly and pumped into the reactor 2 for further treatment to reduce the moisture content of the hazardous waste and compress the volume of the hazardous waste.
[0035] The treated wastewater then enters the wastewater regulating tank 7, which provides suitable wastewater conditions for subsequent biochemical treatment by adjusting parameters such as pH value, temperature and concentration. Finally, the wastewater enters the triple-effect evaporator 8, which reduces the water content in the wastewater through evaporation and increases the concentration of the wastewater, creating conditions for subsequent treatment or resource utilization.
[0036] During the entire pretreatment process, each device is connected by a pipeline to achieve continuous flow and treatment of wastewater. At the same time, the liquid level of the wastewater is monitored in real time by a liquid level meter 20 to ensure the stability and safety of the treatment process. In addition, a cooling coil 24 is provided on the outside of the reactor 2 to control the temperature of the reactor 2 to ensure the smooth progress of the treatment process.
[0037] After being treated by the pretreatment system, the toxicity of cephalosporin wastewater was effectively degraded, the COD removal rate was 84.98%, BOD / COD>0.3, and the biodegradability was improved, providing more favorable conditions for subsequent biochemical treatment.
[0038] Example 2
[0039] The cephalosporin wastewater is mainly derived from the centrifuged mother liquor and washing water after crystallization. There is less phosphorus residue in this type of wastewater, and it is weakly acidic overall. During the treatment process, if calcium hydroxide is added, a large amount of organic precipitation will be produced, mainly calcium acetate, and there are problems such as slow precipitation speed, long filtration time, and sticky precipitate. Therefore, the acidity is directly adjusted to carry out the iron-carbon reaction to reduce the generation of precipitation and significantly shorten the process time. The specific content of each component in cephalosporin wastewater is as follows: COD concentration is 220900mg / L, NH 3 -N concentration is 440mg / L, TDS concentration is 99100mg / L, TP concentration is 190mg / L, TN concentration is 2300mg / L. Its process scheme is iron-carbon reaction + flocculation + biochemical.
[0040] The cephalosporin wastewater treatment process is as follows:
[0041] First, cephalosporin wastewater is collected in a wastewater collection tank 1. Subsequently, the wastewater enters the reactor 2 from the wastewater collection tank 1. In the reactor 2, the wastewater is acidified by adding an appropriate amount of sulfuric acid to adjust the wastewater to a condition suitable for the iron-carbon reaction and reduce the generation of precipitation. The stirring device 25 in the reactor 2 ensures that the sulfuric acid and the wastewater are fully mixed to achieve a uniform acidification effect.
[0042] The wastewater after acid adjustment enters the wastewater transfer tank 3 for temporary storage, and then enters the iron-carbon reactor 4. The iron-carbon reactor 4 is filled with iron-carbon fillers 21, and the iron-carbon fillers 21 are fully in contact with the wastewater through aeration provided by the Roots blower 23. Under the combined action of aeration and the iron-carbon fillers 21, the toxic substances in the wastewater undergo redox reactions, achieving toxic degradation and improving the biodegradability of the wastewater.
[0043] The treated wastewater then enters the flocculation reactor 5. In the flocculation reactor 5, by adding appropriate amounts of sodium hydroxide, PAC, PAM and other reagents, the suspended matter and colloidal particles in the wastewater undergo flocculation and sedimentation. These reagents allow the impurities in the wastewater to quickly condense into larger particles, which is convenient for subsequent solid-liquid separation.
[0044] The flocculated wastewater enters the vertical flow sedimentation tank 6, where the larger floccules quickly settle to the bottom of the tank under the action of gravity to form a solid phase. The solid phase is pumped into the sludge storage tank 16 for storage through the sludge pump, while the clarified liquid continues to flow to the subsequent treatment unit. The sludge in the sludge storage tank 16 can be cleaned regularly and pumped into the reactor 2 for further treatment.
[0045] The wastewater treated by the vertical flow sedimentation tank 6 enters the wastewater regulating tank 7, and by adjusting its pH value, temperature, concentration and other parameters, suitable wastewater conditions are provided for subsequent biochemical treatment.
[0046] Finally, the wastewater enters the triple-effect evaporator 8, where the water content in the wastewater is further reduced by evaporation, thereby increasing the concentration of the wastewater. The wastewater after evaporation is more suitable for subsequent biochemical treatment.
[0047] During the whole treatment process, each device is connected by pipelines to achieve continuous flow and treatment of wastewater. At the same time, the liquid level of the wastewater is monitored in real time by the liquid level meter 20 to ensure the stability and safety of the treatment process.
[0048] After being treated by the pretreatment system, the toxicity of cephalosporin wastewater was effectively degraded, the COD removal rate was 71.14%, BOD / COD>0.3, and the biodegradability was improved, providing more favorable conditions for subsequent biochemical treatment.
Claims
1. A pretreatment system for cephalosporin wastewater with toxicity degradation and biochemical improvement, characterized in that: The invention comprises a wastewater collection tank (1), a reaction kettle (2), a wastewater transfer tank (3), an iron-carbon reactor (4), a flocculation reactor (5), a vertical flow sedimentation tank (6), a wastewater regulating tank (7) and a triple-effect evaporator (8) which are connected in sequence; the feed port of the reaction kettle (2) is respectively connected to a lime slurry feed tank (9) and a sulfuric acid feed tank (10) through pipelines, the solid phase outlet of the reaction kettle (2) is connected to a plate-frame filter press (11) through pipelines, and the liquid phase outlet of the plate-frame filter press (11) is connected to a plate-frame filter press (11). The solid phase outlet of the plate and frame filter press (11) is connected to the feed port of the reactor (2) through a pipeline, and the solid phase outlet of the plate and frame filter press (11) is connected to the hazardous waste pool (12) through a pipeline; the feed port of the flocculation reactor (5) is respectively connected to the sodium hydroxide feed tank (13), the PAC feed tank (14) and the PAM feed tank (15) through pipelines; the solid phase outlet of the vertical flow sedimentation tank (6) is connected to the sludge storage tank (16) through a pipeline, and the outlet of the sludge storage tank (16) is connected to the inlet of the reactor (2) through a pipeline.
2. The pretreatment system for cephalosporin wastewater with toxicity degradation and biochemical improvement according to claim 1, characterized in that: The outlets of the wastewater regulating tank (7) and the triple-effect evaporator (8) are connected to the biochemical system (17) via pipelines.
3. The pretreatment system for cephalosporin wastewater with toxicity degradation and biochemical improvement according to claim 1 is characterized in that: The outlet pipelines of the lime slurry feeding tank (9), the sulfuric acid feeding tank (10), the sodium hydroxide feeding tank (13), the PAC feeding tank (14) and the PAM feeding tank (15) are respectively provided with metering pumps (18).
4. The pretreatment system for cephalosporin wastewater with toxicity degradation and biochemical improvement according to claim 1, characterized in that: The solid phase outlet of the reactor (2), the outlet of the wastewater transfer tank (3), the solid phase outlet of the vertical flow sedimentation tank (6), and the liquid phase outlet pipeline of the plate and frame filter press (11) are respectively provided with a driving pump (19).
5. The pretreatment system for cephalosporin wastewater with toxicity degradation and biochemical improvement according to claim 1, characterized in that: Liquid level meters (20) are respectively provided inside the wastewater collection tank (1), the wastewater transfer tank (3), the wastewater regulating tank (7), and the sulfuric acid feeding tank (10).
6. The pretreatment system for cephalosporin wastewater with toxicity degradation and biochemical improvement according to claim 1, characterized in that: The iron-carbon reactor (4) is provided with an iron-carbon filler (21) and an aeration pipe (22), and the inlet of the aeration pipe (22) is connected to a Roots blower (23).
7. The pretreatment system for cephalosporin wastewater with toxicity degradation and biochemical improvement according to claim 1, characterized in that: A cooling coil (24) is provided on the outside of the reaction kettle (2).
8. The pretreatment system for cephalosporin wastewater with toxicity degradation and biochemical improvement according to claim 7, characterized in that: A stirring device (25) is provided inside the reaction kettle (2), the lime slurry feeding tank (9), the flocculation reactor (5), the sodium hydroxide feeding tank (13), the PAC feeding tank (14) and the PAM feeding tank (15).