Treatment system for high-concentration garlic processing wastewater

Abstract

The invention relates to the technical field of garlic processing wastewater treatment, and discloses a high-concentration garlic processing wastewater treatment system which comprises a thickness distribution grid I. A primary sedimentation tank is fixedly connected to the outside of the thickness distribution grid I. A hydrolysis regulating tank is fixedly connected to the right side of the primary sedimentation tank through a pipeline. The front side of the hydrolysis regulating tank is fixedly connected with an MBBR (Moving Bed Biofilm Reactor) tank through a pipeline, the left side of the MBBR tank is fixedly connected with an MBBR buffer tank through a pipeline, the left side of the MBBR buffer tank is fixedly connected with a sedimentation tank through a pipeline, the front side of the sedimentation tank is provided with a coagulative precipitation tank, and the right side of the exterior of the coagulative precipitation tank is fixedly connected with a disinfection tank. According to the invention, the EBIS biochemical system adopted by the biochemical system has the advantages of high sludge concentration (5-8 g / L), large-ratio (dozens of times or even higher) internal circulation dilution, low dissolved oxygen environment (about 0.5 mg / L), accurate dissolved oxygen control (DOCS intelligent dissolved oxygen control system) and the like, and can effectively degrade organic pollutants in wastewater, improve the reaction efficiency, improve the impact resistance, reduce the operation cost and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of garlic processing wastewater treatment, and particularly to a treatment system for high-concentration garlic processing wastewater. Background Art

[0002] Garlic is not only a commonly used vegetable or condiment, but also has a variety of physiological effects. It has broad prospects for development and utilization in the fields of medicine, food, beauty, breeding, preservation of agricultural and livestock products, growth of crops and prevention and control of pests and diseases. Through industrial processing of garlic, not only can industrial raw materials required in the above fields be obtained, but also garlic products for direct consumption can be produced. Using garlic as raw material, through different production processes, a series of garlic products such as garlic powder, garlic oil, dehydrated garlic slices, garlic paste, spray-dried garlic powder, and garlic beverage are produced. The effective antibacterial component of garlic is allicin, also known as garlicin. Pure garlicin is an oily liquid. Garlicin has the effects of promoting qi and removing stagnation, killing insects and detoxifying, sterilizing and stopping dysentery, relieving pain and strengthening the stomach. It has varying degrees of killing effects on Gram-negative and positive bacteria such as Shigella dysenteriae, Escherichia coli, Staphylococcus aureus, Bacillus subtilis, various fungi, protozoa and certain viruses, and belongs to a broad-spectrum and highly effective antibacterial and insecticidal Chinese herbal medicine.

[0003] The wastewater from garlic dehydration processing mainly comes from the garlic peeling and cleaning, slicing, rinsing sections during the processing, as well as the flowing water for flushing the ground and the water for equipment cleaning. Among them, the water consumption for peeling and cleaning and the flowing water for flushing the ground is relatively large. The wastewater contains the colloidal juice flowing out of the garlic cloves, namely allicin oil, allicin, garlic polysaccharide, as well as impurities such as broken garlic cloves, garlic skins, garlic roots, and sediment. Generally, relevant equipment is required to treat the above wastewater before discharging.

[0004] In the prior art, some equipment adopts the following process for treatment: raw water → regulating tank → air flotation → micro-electrolysis → Fenton → coagulation sedimentation → hydrolysis acidification → biochemical system → filter tank → ultraviolet disinfection → external discharge. In the above process, the garlic processing wastewater directly enters the regulating tank without pretreatment. The discarded garlic cloves, garlic skins, garlic roots, garlic slices, etc. in garlic processing undergo long-term anaerobic fermentation and dissolve in water, resulting in an increase in pollutants in the water and affecting the stable operation of subsequent processes. There is no primary sedimentation tank, resulting in a large amount of SS and colloid in the sewage entering the subsequent treatment unit, increasing the load of the subsequent treatment unit. Summary of the Invention

[0005] A treatment system for high-concentration garlic processing wastewater proposed by the present invention aims to improve the problems in the prior art that in some devices, the pollutants in the water increase, affecting the stable operation of subsequent processes, increasing the load of the subsequent treatment unit, and resulting in an increase in the total salt content of the effluent.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A treatment system for high-concentration garlic processing wastewater, including a coarse and fine distribution grille I. The outside of the coarse and fine distribution grille I is fixedly connected with a primary sedimentation tank. The right side of the primary sedimentation tank is fixedly connected with a hydrolysis and regulation tank through a pipeline. The front side of the hydrolysis and regulation tank is fixedly connected with an MBBR tank through a pipeline. The left side of the MBBR tank is fixedly connected with an MBBR buffer tank through a pipeline. The left side of the MBBR buffer tank is fixedly connected with a first sedimentation tank through a pipeline. The front side of the first sedimentation tank is provided with a coagulation and sedimentation tank. The outside right side of the coagulation and sedimentation tank is fixedly connected with a disinfection tank.

[0008] As a further description of the above technical solution:

[0009] The outside rear side of the coagulation and sedimentation tank is fixedly connected with a sludge thickening tank through a pipeline. The right side of the sludge thickening tank is provided with a sludge dewatering system. One of the output ports of the sludge dewatering system is fixedly connected inside the hydrolysis and regulation tank.

[0010] As a further description of the above technical solution:

[0011] An EBIS biochemical system is provided between the first sedimentation tank and the coagulation and sedimentation tank. One of the output ports of the EBIS biochemical system is fixedly connected inside the sludge thickening tank. A precision filter is provided between the coagulation and sedimentation tank and the disinfection tank. An activated carbon adsorption tank is provided between the coagulation and sedimentation tank and the disinfection tank.

[0012] As a further description of the above technical solution:

[0013] The rear side of the sludge thickening tank is fixedly connected with the front side of the MBBR buffer tank through a pipeline. One end of the left side of the sludge thickening tank is fixedly connected with one of the output ports of the first sedimentation tank.

[0014] The present invention has the following beneficial effects:

[0015] 1. In the present invention, since some garlic processing wastewater is high-concentration wastewater with a COD up to tens of thousands of mg / L, an MBBR system is set up to remove most of the organic pollutants, etc., thereby reducing the treatment pressure on the subsequent biochemical system. The EBIS biochemical system adopted by the biochemical system has advantages such as a high sludge concentration (5 - 8 g / L), a large specific multiple (more than ten times or even higher) of internal circulation dilution, a low dissolved oxygen environment (about 0.5 mg / L), and precise dissolved oxygen control (DOCS intelligent dissolved oxygen control system), etc., which can effectively degrade the organic pollutants in the wastewater, improve the reaction efficiency, improve the shock resistance ability, and reduce the operation cost, etc.

[0016] 2. In the present invention, in view of the characteristics of more sundries in the garlic processing wastewater, pretreatment units such as a grille and a primary sedimentation tank are provided to remove the sundries. After coagulation sedimentation, a precision filtration device is added to further ensure the SS index in the discharged water quality. Contact disinfection is adopted to avoid incomplete disinfection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic flow chart of a treatment system for high-concentration garlic processing wastewater proposed by the present invention.

[0018] LEGEND DESCRIPTION:

[0019] 1. Coarse and fine distribution grille one; 2. Primary sedimentation tank; 3. Hydrolysis adjustment tank; 4. MBBR tank; 5. MBBR buffer tank; 6. First sedimentation tank; 7. EBIS biochemical system; 8. Coagulation sedimentation tank; 9. Precision filtration; 10. Activated carbon adsorption tank; 11. Disinfection tank; 12. Sludge thickening tank; 13. Sludge dewatering system. SPECIFIC EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Refer to Figure 1, an embodiment provided by the present invention: a treatment system for high-concentration garlic processing wastewater, including a coarse and fine distribution grille 1, which removes larger floating substances in the sewage to prevent blockage of pumps or subsequent units. The outside of the coarse and fine distribution grille 1 is fixedly connected with a primary sedimentation tank 2, which removes heavier solid impurities in the sewage by precipitation. The right side of the primary sedimentation tank 2 is fixedly connected with a hydrolysis and regulation tank 3 through a pipeline, which regulates the water quality and quantity, and preliminarily decomposes organic pollutants in the sewage. The front side of the hydrolysis and regulation tank 3 is fixedly connected with an MBBR tank 4 through a pipeline. Using the high-load treatment capacity of the MBBR system, pollutants with a relatively high concentration in the sewage are treated. The left side of the MBBR tank 4 is fixedly connected with an MBBR buffer tank 5 through a pipeline. As the sedimentation tank of the MBBR, most of the activated sludge is settled and discharged. The left side of the MBBR buffer tank 5 is fixedly connected with a first sedimentation tank 6 through a pipeline, which further precipitates the suspended substances in the sewage to avoid affecting the subsequent biochemical system. The front side of the first sedimentation tank 6 is provided with a coagulation sedimentation tank 8. By adding agents, the suspended substances in the sewage are further degraded; a function of adding powdered activated carbon is reserved. When the water quality is high, it is added. The outside right side of the coagulation sedimentation tank 8 is fixedly connected with a disinfection tank 11. By adding disinfectants, the sewage is disinfected to remove larger floating substances in the sewage to prevent blockage of pumps or subsequent units. An EBIS biochemical system 7 is arranged between the first sedimentation tank 6 and the coagulation sedimentation tank 8. Through activated sludge, pollutants such as COD, ammonia nitrogen, and total nitrogen in the sewage are completely degraded. One of the output ports of the EBIS biochemical system 7 is fixedly connected to the inside of the sludge thickening tank 12;

[0022] A precision filter 9 is arranged between the coagulation sedimentation tank 8 and the disinfection tank 11 to intercept and remove fine particles. An activated carbon adsorption tank 10 is arranged between the coagulation sedimentation tank 8 and the disinfection tank 11. When the water quality is poor, the strong adsorption capacity of activated carbon is used to adsorb the refractory pollutants in the sewage; an activated carbon regeneration system is set up to regenerate and reuse the used activated carbon. The outside rear side of the coagulation sedimentation tank 8 is fixedly connected with a sludge thickening tank 12 through a pipeline. A sludge dewatering system 13 is arranged on the right side of the sludge thickening tank 12. One of the output ports of the sludge dewatering system 13 is fixedly connected to the inside of the hydrolysis and regulation tank 3. The rear side of the sludge thickening tank 12 is fixedly connected to the front side of the MBBR buffer tank 5 through a pipeline. One end of the left side of the sludge thickening tank 12 is fixedly connected to one of the output ports of the first sedimentation tank 6.

[0023] Working principle: First, the sewage passes through the coarse and fine distribution grille 1 to remove large floating objects and prevent the blockage of subsequent equipment. Then, the sewage flows into the primary sedimentation tank 2, where sedimentation occurs to remove heavier solid impurities. After primary sedimentation, the sewage enters the hydrolysis and regulation tank 3 to regulate the water quality and quantity and preliminarily degrade organic pollutants. Subsequently, the sewage enters the MBBR tank 4, and the high-load treatment capacity of the MBBR system is used to treat high-concentration pollutants.

[0024] The treated sewage flows into the MBBR buffer tank 5 to settle most of the activated sludge, and then further precipitate suspended solids through the primary sedimentation tank 6 to ensure the normal operation of the subsequent biochemical system. The coagulation sedimentation tank 8 further degrades suspended solids by adding chemicals and reserves the function of adding powdered activated carbon to cope with higher water quality situations. Then, the sewage enters the disinfection tank 11, and disinfectants are added to remove remaining pollutants.

[0025] Between the coagulation sedimentation tank 8 and the disinfection tank 11, the precision filter 9 intercepts fine particles, and the activated carbon adsorption tank 10 uses the adsorption capacity of activated carbon to remove refractory pollutants when the water quality is poor. The used activated carbon is recycled through the activated carbon regeneration system. Finally, the sludge thickening tank 12 centrally treats the precipitated sludge, and the sludge dewatering system 13 dehydrates the sludge, and finally returns the dehydrated sludge to the hydrolysis and regulation tank 3 or the MBBR buffer tank 5 to form a cyclic treatment process.

[0026] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A system for treating high-concentration garlic processing wastewater, comprising a coarse-fine distribution grid (1), characterized in that: The outside of the coarse-fine distribution grid (1) is fixedly connected to a primary sedimentation tank (2); the right side of the primary sedimentation tank (2) is fixedly connected to a hydrolysis regulating tank (3) via a pipeline; the front side of the hydrolysis regulating tank (3) is fixedly connected to an MBBR tank (4) via a pipeline; the left side of the MBBR tank (4) is fixedly connected to an MBBR buffer tank (5) via a pipeline; the left side of the MBBR buffer tank (5) is fixedly connected to a sedimentation tank (6) via a pipeline; a coagulation sedimentation tank (8) is provided on the front side of the sedimentation tank (6); and the right side of the outside of the coagulation sedimentation tank (8) is fixedly connected to a disinfection tank (11).

2. A treatment system for high-concentration garlic processing wastewater according to claim 1, characterized in that: The rear side of the exterior of the coagulation sedimentation tank (8) is fixedly connected to a sludge thickening tank (12) via a pipeline, a sludge dewatering system (13) is provided on the right side of the sludge thickening tank (12), and one of the output ports of the sludge dewatering system (13) is fixedly connected to the interior of the hydrolysis adjustment tank (3).

3. A treatment system for high-concentration garlic processing wastewater according to claim 2, characterized in that: An EBIS biochemical system (7) is arranged between the first settling tank (6) and the coagulation sedimentation tank (8); one of the output ports of the EBIS biochemical system (7) is fixedly connected to the interior of the sludge thickening tank (12); a precision filter (9) is arranged between the coagulation sedimentation tank (8) and the disinfection tank (11); and an activated carbon adsorption tank (10) is arranged between the coagulation sedimentation tank (8) and the disinfection tank (11).

4. A treatment system for high-concentration garlic processing wastewater according to claim 2, characterized in that: The rear side of the sludge thickening tank (12) is fixedly connected to the front side of the MBBR buffer tank (5) through a pipeline, and the left end of the sludge thickening tank (12) is fixedly connected to one of the output ports of the first settling tank (6).

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