Pretreatment device for nervonic acid production wastewater from malania oleifera

Abstract

The utility model relates to a pretreatment device for nervonic acid production wastewater from malania oleifera, which belongs to the technical field of wastewater treatment, and comprises a micro-electrolysis reactor, a Fenton reactor, a solid-liquid separator, an ECO reactor and a settling pond which are sequentially arranged according to a process treatment sequence, and further comprises a sludge pond 8 for collecting settled sludge. Iron-carbon filler is arranged in the micro-electrolysis reactor, an aeration device is arranged in the micro-electrolysis reactor, the Fenton reactor is provided with a hydrogen peroxide adding device in a matched manner, and an aeration device is arranged at the bottom of the Fenton reactor; according to the device, the sewage generated in the process of extracting nervonic acid from malania oleifera can be effectively treated, the influence of high organic matters, high salt and high acid on the treatment effect is maximally avoided in the sewage treatment process, the effective decomposition of high-concentration organic matters is realized by using less equipment, and the influence of high salt and high acid on the sewage treatment effect is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and specifically relates to a pretreatment device for nervonic acid wastewater produced by garlic fruit production. Background Art

[0002] Garlic fruit is an evergreen tree of the genus Garlic fruit of the family Aspergillus, mainly distributed in western Guangxi and eastern Yunnan, China. Garlic fruit seeds contain oil, including oleic acid, palmitic acid and stearic acid, and are good woody oil plants and national second-level key protected wild plants. Nerve acid, also known as shark acid, is a very long chain monounsaturated fatty acid that plays an important role in improving brain nerve activity, repairing brain damage, and preventing brain nerve aging. Its chemical name is cis-15-tetradecenoic acid, and its molecular formula is C 24 H 46 O2, with a relative molecular mass of 366.6, is a white flaky crystal at room temperature, soluble in alcohol but insoluble in water, with a melting point of 39-40°C. Currently, neuraminic acid on the market is often derived from the brain tissue of animals such as sharks, and is very expensive. The garlic fruit, which is unique to my country, is the plant with the highest neuraminic acid content in seeds reported so far. Its seed oil contains up to 55.70%-67% neuraminic acid, which has opened up a new way for the development and sustainable utilization of neuraminic acid resources.

[0003] The crude mixed fatty acids obtained after saponification, acidification and water washing of garlic fruit oil can be further purified by solvent crystallization separation to obtain neuraminic acid. The disadvantage of this production process is that a large amount of organic solvents such as ethyl acetate and ethanol are used in the process of extracting and purifying neuraminic acid, and the generated wastewater has the characteristics of high organic matter concentration, high salinity, strong acidity, etc. The existing sewage treatment equipment is unable to achieve effective treatment of garlic fruit wastewater, and direct discharge will cause serious pollution to the environment. Utility Model Content

[0004] In order to overcome the problems existing in the background technology, the utility model provides a pretreatment process device for the production of neuraminic acid wastewater from garlic fruit, which can effectively treat the sewage generated in the process of extracting neuraminic acid from garlic fruit, and maximize the avoidance of the influence of high organic matter, high salt and high acid on the treatment effect during the sewage treatment process, and achieve effective decomposition of high-concentration organic matter with less equipment, and solve the influence of high salt and high acid on the sewage treatment effect.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] The pretreatment device for nervonic acid wastewater produced by garlic fruit comprises a micro-electrolysis reactor, a Fenton reactor, an ECO reactor and a sedimentation tank which are arranged in sequence according to the process treatment sequence; an iron-carbon filler is arranged in the micro-electrolysis reactor; the Fenton reactor is equipped with a hydrogen peroxide adding device and an aeration device at the bottom.

[0007] Preferably, a solid-liquid separator is provided between the Fenton reactor and the ECO reactor; the solid-liquid separator is equipped with a sodium hydroxide adding device, and the supernatant outlet of the solid-liquid separator is connected to the ECO reactor.

[0008] Preferably, an aeration device is provided in the micro-electrolysis reactor, and a water outlet weir is provided at the upper part. The water outlet of the micro-electrolysis reactor is arranged at the water outlet weir, and the water outlet is connected to the Fenton reactor.

[0009] Preferably, the pretreatment device for the nervonic acid wastewater produced by garlic fruit also includes a sludge tank; the solid phase of the solid-liquid separator is transported to the sludge tank through a conveying device.

[0010] Preferably, the front-end process of the micro-electrolysis reactor is provided with a water collection tank and a lifting pump; the water collection tank is connected to the micro-electrolysis reactor via the lifting pump and a delivery pipeline.

[0011] Preferably, the sludge in the sedimentation tank is transported to the sludge tank via a transporting device or a pipeline.

[0012] Preferably, the iron-carbon filler is mainly composed of 75% iron, 12% graphite, 7% catalyst, and 5% coupling agent, with a porosity of ≥65% and a specific surface area of ​​1.2 kg / cm 2 .

[0013] Preferably, the sedimentation tank is provided with a flocculant adding device.

[0014] Preferably, the pretreatment device for the nervonic acid wastewater produced by garlic fruit also includes an MVR reactor and other biochemical reactors or other sewage treatment equipment in the back-end process of a sedimentation tank.

[0015] Beneficial effects of the utility model:

[0016] The utility model combines the characteristics of the wastewater from the extraction of neuraminic acid from garlic fruit, and overcomes the influence of high organic matter concentration, high salinity, high acidity, etc. on the wastewater treatment effect through the process sequence setting of a micro-electrolysis reactor, a Fenton reactor and an ECO reactor, thereby achieving effective decomposition of high-concentration organic matter and solving the influence of high salt and high acidity on the sewage treatment effect.

[0017] The utility model does not require additional Fe addition in the micro-electrolysis-Fenton system 2+There is no need to add acid to adjust pH, no chemical addition, Fe 2+ High activity, reducing the amount of sludge (iron sludge) by more than 50%, reducing sludge treatment costs and environmental risks, low equipment investment and low operating costs.

[0018] The utility model couples ECO after micro-electrolysis-Fenton, has low suspended solids in influent, good wastewater conductivity, high treatment efficiency, mild reaction conditions, fast reaction speed, and thorough degradation of organic matter.

[0019] The utility model has the advantages of strong controllability, easy adjustment and control of the reaction process, high efficiency, good environmental protection benefits, and no secondary pollution during the treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is a schematic diagram of a treatment process for treating garlic fruit wastewater using the utility model;

[0022] In the figure, 1-micro electrolysis reactor, 2-Fenton reactor, 3-ECO reactor, 4-sedimentation tank, 5-iron-carbon filler, 6-aeration device, 7-effluent weir, 8-sludge tank, 9-collecting tank, 10-lifting pump, 11-pH adjustment tank, 12-solid-liquid separator. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technicians.

[0024] In the description of the present invention, unless otherwise specified, the terms "left", "right", etc. indicating directions or state relationships are based on the directions or state relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0026] like Figure 1 and2 As shown, the pretreatment device for the wastewater of nervonic acid produced by garlic fruit comprises a water collection tank 9, a micro-electrolysis reactor 1, a Fenton reactor 2, a solid-liquid separator 12, an ECO reactor 3 and a sedimentation tank 4, which are arranged in sequence according to the process processing sequence, and also comprises a sludge tank 8 for collecting precipitated sludge. The water collection tank 9 is connected to the micro-electrolysis reactor 1 through a lifting pump 10 and a pipeline.

[0027] The solid-liquid separator 12 is equipped with a sodium hydroxide adding device, and the supernatant outlet of the solid-liquid separator 12 is connected to the ECO reactor 3. The utility model can complete pH adjustment and solid-liquid separation in the solid-liquid separator 12, and a pH adjustment tank 11 can be set separately. If a pH adjustment tank 11 is set separately, the sodium hydroxide adding device is matched with the pH adjustment tank 11, and the sewage is first adjusted in the pH adjustment tank 11 for pH value and then sent to the solid-liquid separator 12 for solid-liquid separation.

[0028] The micro-electrolysis reactor 1 is provided with an iron-carbon filler 5 and an aeration device 6. The outlet of the micro-electrolysis reactor is arranged at the outlet weir 7, and the outlet is connected to the Fenton reactor 2. The wastewater from the production of nervonic acid from garlic fruit (hereinafter referred to as wastewater) first enters the water collection tank 9, and is transported to the micro-electrolysis reactor 1 through the lifting pump 10, and enters the micro-electrolysis reactor 1 from the bottom. The pH value in the micro-electrolysis reactor 1 is maintained below 4. After the micro-electrolysis reaction, the wastewater contains a large amount of active Fe 2+ , initially decompose organic pollutants in sewage, break chains and open rings of organic matter, and the effluent from micro-electrolysis reaction enters Fenton reactor 2 through the outlet. The iron-carbon filler 5 is a Fe-C filler formed by sintering iron powder, graphite, catalyst and coupling agent, purchased from the market, with a porosity of ≥65% and a specific surface area of ​​1.2kg / cm 2 , its main components are: 75% iron, 12% graphite, 7% catalyst, 5% coupling agent. Iron-carbon filler 5 is immersed in acidic wastewater. Due to the electrode potential difference, countless micro corrosion cells will be formed in the wastewater. The carbon with high potential is the cathode and the iron with low potential is the anode. The organic matter and chromophore are treated, which can greatly reduce the chromaticity and COD of the wastewater, increase the B / C ratio, and improve the biodegradability of the wastewater.

[0029] The Fenton reactor 2 is equipped with a hydrogen peroxide adding device and an aeration device 6 at the bottom. 30% hydrogen peroxide is added to the Fenton reactor 2 through the hydrogen peroxide adding device. 2+ A Fenton system with strong oxidation effect is formed. The bottom of the Fenton reactor 2 is aerated by a microbubble aeration device. The reaction takes 2-4 hours, and the generated ·OH quickly degrades organic pollutants.

[0030] After the wastewater reacts in the Fenton reactor 2, it enters the pH adjustment tank 11. Sodium hydroxide is added into the pH adjustment tank 11 through a sodium hydroxide adding device to adjust the pH value to 9. After the pH value is adjusted, it is sent to the solid-liquid separator 12. PAM is added to the solid-liquid separator 12 for coagulation and precipitation. The supernatant enters the ECO reactor 3, and the solid sludge enters the sludge tank 8.

[0031] Active fillers are added to the ECO reactor 3. The active fillers are modified activated carbon loaded with iron (activated carbon is about 60-80%). The electron transfer is strengthened, which can effectively improve the efficiency of the electrocatalytic reaction and produce some active substances such as OH and ClO under the condition of an external DC electric field. - The residual refractory organic pollutants in the wastewater are degraded, and the effluent of the ECO reactor 3 enters the sedimentation tank 4. PAC and PAM are added to the sedimentation tank 4 for coagulation and precipitation. The supernatant is discharged from the effluent weir to complete the pretreatment process of the nervonic acid wastewater produced by garlic fruit. The sludge enters the sludge tank 8 for external disposal.

[0032] After the wastewater is treated by the micro-electrolysis-Fenton-ECO coupling process, the COD removal rate reaches 80%-90%.

[0033] Application examples:

[0034] The treatment effect of wastewater after being treated by various equipment is shown in the figure below:

[0035]

[0036] After being treated by this device, most of the organic matter is removed, the pH value is increased to 6-9, and the biodegradability is improved (B / C ratio is increased from 0.1 to 0.3-0.5), but the salt content is still around 5%, so it needs to be desalted by MVR and the condensed water needs to be biochemically treated to meet the standards. In addition, since the organic matter (ethanol, ethyl acetate) in the wastewater is volatile and has a boiling point close to that of water, it directly enters the MVR reactor without pretreatment, and COD cannot be reduced and will be brought into the condensate, resulting in greater difficulty in subsequent biochemical treatment. Other sewage treatment equipment such as MVR reactors and other biochemical reactors can be added to this device for further treatment.

[0037] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. A pretreatment device for nervonic acid wastewater produced by garlic fruit, characterized in that: The invention comprises a micro-electrolysis reactor, a Fenton reactor, an ECO reactor and a sedimentation tank which are arranged in sequence according to the process processing sequence; the micro-electrolysis reactor is provided with an iron-carbon filler; the Fenton reactor is equipped with a hydrogen peroxide adding device and an aeration device at the bottom.

2. The pretreatment device for the nervonic acid wastewater produced by garlic fruit according to claim 1, characterized in that: A solid-liquid separator is arranged between the Fenton reactor and the ECO reactor; the solid-liquid separator is equipped with a sodium hydroxide adding device, and the supernatant liquid outlet of the solid-liquid separator is connected to the ECO reactor.

3. The pretreatment device for the nervonic acid wastewater produced by garlic fruit according to claim 2 is characterized in that, An aeration device is arranged in the micro-electrolysis reactor, and a water outlet weir is arranged on the upper part. The water outlet of the micro-electrolysis reactor is arranged at the water outlet weir, and the water outlet is connected with the Fenton reactor through a pipeline.

4. The pretreatment device for the nervonic acid wastewater produced by garlic fruit according to claim 3 is characterized in that, It also includes a sludge tank; the solid phase of the solid-liquid separator is transported to the sludge tank through a transporting device.

5. The pretreatment device for nervonic acid wastewater produced by garlic fruit according to any one of claims 1 to 4, characterized in that: The front end process of the micro-electrolysis reactor is provided with a water collection tank and a lifting pump; the water collection tank is connected to the micro-electrolysis reactor through the lifting pump and the delivery pipeline.

6. The pretreatment device for the nervonic acid wastewater produced by garlic fruit according to claim 5 is characterized in that, The sludge in the sedimentation tank is transported to the sludge tank through a transport device or a pipeline.

7. The pretreatment device for nervonic acid wastewater produced by garlic fruit according to claim 1 is characterized in that, The porosity of the iron-carbon filler is ≥65%, and the specific surface area is 1.2 kg / cm 2 .

8. The pretreatment device for nervonic acid wastewater produced by garlic fruit production according to claim 1 is characterized in that, The sedimentation tank is provided with a flocculant adding device.

9. The pretreatment device for nervonic acid wastewater produced by garlic fruit according to claim 1 is characterized in that, It also includes an MVR reactor and a biochemical reactor for the back-end process of the sedimentation tank.

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