System for removing suspended solids in kitchen waste wastewater

Abstract

The utility model provides a kitchen waste wastewater suspended matter removal system. The kitchen waste wastewater suspended matter removal system comprises a PH adjusting module, a pipeline mixer, a flocculant blending and adding module and a dehydration module, the PH adjusting module comprises an alkali liquor adding device, a NaOH blending device and an alkali liquor adding device, the output end of the alkali liquor adding device is connected with an alkali liquor inlet of the NaOH blending device, and the output end of the NaOH blending device is connected with the input end of the alkali liquor adding device; the output end of the alkali liquor adding device is connected with the input end of the pipeline mixer; the dehydration module comprises a homogenizing device and a desliming device, the input end of the homogenizing device is connected with the output end of the flocculant blending and adding module and the output end of the pipeline mixer, and the input end of the desliming device is connected with the output end of the homogenizing device. The system can be used for efficiently removing suspended matters in the kitchen waste wastewater.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a system for removing suspended matter from kitchen garbage wastewater. Background Art

[0002] Restaurant wastewater is a high-concentration organic wastewater with a solid content of 10-15%, a chemical oxygen demand (COD) of about 100,000-150,000 mg / L, and suspended solids (SS) of 70,000-90,000 mg / L. The treatment of restaurant wastewater is very difficult; the SS concentration is high and the oil content is also high. Therefore, removing suspended solids from restaurant wastewater is a key issue that needs to be urgently addressed at all stages of the restaurant wastewater treatment process.

[0003] At present, when removing SS from kitchen waste water, some are removed through a flotation tank, that is, the sewage flows into a small aeration section equipped with a releaser (or a gas-liquid mixing pump), and the sewage is fully mixed with the microbubbles generated by the aeration section during the rising process. Due to the density imbalance between the gas-water mixture and the liquid, a vertical upward buoyancy is generated, which brings the SS to the water surface. During the floating process, the microbubbles will attach to the SS, and after reaching the water surface, the SS will rely on these bubbles to support and maintain the water surface, so that the SS floating on the water surface is intermittently removed by the chain scraper. Although this existing method can remove SS from kitchen waste water, the SS removal efficiency of this method is not high. Therefore, how to efficiently remove suspended matter in kitchen waste water is a technical problem that needs to be solved urgently. Utility Model Content

[0004] In view of this, the utility model provides a system for removing suspended matter from kitchen waste water to solve one or more technical problems existing in the prior art.

[0005] According to one aspect of the utility model, a suspended matter removal system for kitchen waste water is disclosed, the suspended matter removal system comprising a pH adjustment module, a pipeline mixer, a flocculant preparation and addition module and a dehydration module;

[0006] The pH regulating module comprises an alkali solution dosing device, a NaoH mixing device and an alkali solution adding device, wherein the output end of the alkali solution dosing device is connected to the alkali solution inlet of the NaoH mixing device, the output end of the NaoH mixing device is connected to the input end of the alkali solution adding device, and the output end of the alkali solution adding device is connected to the input end of the pipeline mixer;

[0007] The dehydration module comprises a homogenizing device and a desludging device. The input end of the homogenizing device is connected to the output end of the flocculant mixing and adding module and the output end of the pipeline mixer. The input end of the desludging device is connected to the output end of the homogenizing device.

[0008] In some embodiments of the utility model, the flocculant mixing and adding module includes a flocculant dosing device, a flocculant mixing device and a flocculant adding device, the output end of the flocculant dosing device is connected to the flocculant inlet of the flocculant mixing device, the output end of the flocculant mixing device is connected to the input end of the flocculant adding device, and the output end of the flocculant adding device is connected to the input end of the homogenizing device.

[0009] In some embodiments of the present invention, the dehydration module includes a mixing device, a first input end of the mixing device is connected to the output end of the flocculant preparation and addition module, a second input end of the mixing device is connected to the output end of the pipeline mixer, and the output end of the mixing device is connected to the input end of the homogenization device.

[0010] In some embodiments of the present invention, the desludging device is a screw stacking machine.

[0011] In some embodiments of the present invention, the alkali solution adding device is an alkali solution delivery pump.

[0012] In some embodiments of the present invention, the flocculant dosing device is a flocculant dosing pump.

[0013] In some embodiments of the present invention, the system further comprises a safety valve, and the safety valve is arranged between the alkali solution dosing device and the pipeline mixer.

[0014] In some embodiments of the present invention, the system further comprises a damper, wherein the damper is located between the safety valve and the pipeline mixer.

[0015] In some embodiments of the present invention, the system comprises an electric regulating valve, and the electric regulating valve is located between the pipeline mixer and the mixing device.

[0016] In some embodiments of the present invention, there are multiple alkali solution delivery pumps and multiple flocculant dosing pumps.

[0017] The kitchen waste water suspended solids removal system disclosed in the embodiment of the utility model comprises a pH adjustment module, a pipeline mixer, a flocculant preparation and addition module and a dehydration module, and the pH adjustment module comprises an alkali solution dosing device, a NaOH (sodium hydroxide) preparation device and an alkali solution adding device, and the dehydration module comprises a homogenizing device and a desludging device, and the alkali solution adding device is used to add the prepared alkali solution to the pipeline mixer, so that the prepared alkali solution and the kitchen waste water are fully mixed in the pipeline mixer, and the kitchen waste water after the alkali solution and the waste water are fully mixed is input to the homogenizing device, and reacts and homogenizes with the flocculant added by the flocculant preparation and addition module in the homogenizing device, and then the homogenized kitchen waste water is transported to the desludging device for desludging. Before the kitchen waste water is desludged by the desludging device, the system pre-treats the kitchen waste water and adjusts the physical and chemical properties of the waste water, so that the system can not only efficiently remove the suspended solids in the kitchen waste water, but also has an ideal SS removal effect.

[0018] Additional advantages, purposes, and features of the present invention will be partially described in the following description, and will become partially apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written description and its claims and the drawings.

[0019] Those skilled in the art will understand that the purposes and advantages that can be achieved by the present invention are not limited to the above specific description, and the above and other purposes that can be achieved by the present invention will be more clearly understood based on the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are only for the purpose of illustrating the principles of the present invention. In order to facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, they may become larger relative to other components in the exemplary device actually manufactured according to the present invention. In the drawings:

[0021] Figure 1 The present invention is a schematic structural diagram of a system for removing suspended matter from kitchen waste water according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] Alkali solution dosing tank 1 magnetic flap level gauge 2 alkali solution delivery pump 3 safety valve 4 damping valve 5 pipeline mixer 6 electric regulating valve 7 integrated flocculation dosing device 8 flocculant dosing pump 9 mixing device 10 homogenizing device 11 screw stacking machine 12 mud discharge port 13 water outlet 14 DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model more clear, the embodiment of the utility model is further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiment of the utility model and its description are used to explain the utility model, but are not used as a limitation of the utility model.

[0025] It should be noted here that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the scheme according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0026] It should be emphasized that the terms “include / comprises / has” when used herein refer to the presence of features, elements, steps or components, but do not exclude the presence or addition of one or more other features, elements, steps or components.

[0027] It should also be noted that the directional nouns in this specification are relative to the position directions shown in the drawings; if there is no special explanation, the term "connection" in this article can refer to not only direct connection, but also indirect connection with an intermediate. Direct connection means that two parts are connected without the help of an intermediate part, and indirect connection means that two parts are connected with the help of other parts.

[0028] The treatment of food waste wastewater includes multiple stages; the first stage: after the food waste is pre-treated, the slurry produced after removing domestic garbage, iron, sand and other impurities; the second stage: after the first stage of treatment, the slurry impurities in the food waste are removed, but the oil (about 3-8% by mass) contained in it will seriously affect the subsequent process treatment. At the same time, high-purity oil also has a high economic value, so the oil in the food waste slurry needs to be extracted and removed. The third stage: the food waste slurry after the second stage of treatment needs to be anaerobic fermentation, A / O and other process treatments before it can meet the discharge standards. In this process, some biochemical sludge will be discharged, and the discharged biochemical sludge also needs to be further removed.

[0029] In order to facilitate the normal operation of restaurant wastewater in the anaerobic process, sewage treatment process and other stages, it is necessary to effectively remove SS in the restaurant wastewater. Based on this, the present application provides a restaurant wastewater suspended matter removal system, which can efficiently remove suspended matter in restaurant wastewater. The restaurant wastewater suspended matter removal system can be applied to various stages of the restaurant waste treatment process.

[0030] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals represent the same or similar components.

[0031] Figure 1 FIG. 1 is a schematic diagram of the structure of a system for removing suspended solids from kitchen waste water in an embodiment of the present invention. Figure 1 As shown, the system at least includes a pH adjustment module, a pipeline mixer, a flocculant preparation and addition module and a dehydration module.

[0032] The pH adjustment module includes an alkali solution dosing device, a NaoH preparation device and an alkali solution adding device, the output end of the alkali solution dosing device is connected to the alkali solution inlet of the NaoH preparation device, the output end of the NaoH preparation device is connected to the input end of the alkali solution adding device, and the output end of the alkali solution adding device is connected to the input end of the pipeline mixer 6. The dehydration module includes a homogenizing device 11 and a desludging device, the input end of the homogenizing device 11 is connected to the output end of the flocculant preparation and addition module and the output end of the pipeline mixer 6, and the input end of the desludging device is connected to the output end of the homogenizing device 11.

[0033] In some embodiments, the NaOH preparation device may specifically include a magnetic flap level gauge 2 and an alkali solution dosing tank 1, in which case the alkali solution dosing device may add alkali solution to the alkali solution dosing tank 1, and the magnetic flap level gauge 2 is used to monitor the liquid level in the alkali solution dosing tank 1, thereby determining the amount of NaOH high-concentration alkali solution to be added to the alkali solution dosing tank 1. In this embodiment, the NaOH high-concentration alkali solution is added to the alkali solution dosing tank 1 according to the alkali solution dosage determined by the magnetic flap level gauge 2, so that the NaOH high-concentration alkali solution in the alkali solution dosing tank 1 is adjusted by adding water to keep the NaOH solution concentration at 10%. Furthermore, the prepared NaOH solution is added to the pipeline mixer 6 through the alkali solution dosing device and the matching delivery pipeline, so that the prepared NaOH solution is mixed with the food waste wastewater delivered to the pipeline mixer 6 in the pipeline mixer 6. The pH adjustment module is mainly used to adjust the pH of restaurant wastewater, because restaurant waste contains a large amount of organic matter, which will produce a large amount of volatile organic acid under natural conditions, causing the pH of restaurant wastewater to be around 4, but under this pH value, the flocculation effect is difficult to meet the process requirements; therefore, the restaurant wastewater suspended solids removal system of the present application first pre-treats the restaurant wastewater through the pH adjustment module to adjust the pH value of the restaurant wastewater; based on the suspended solids removal system of the present application, it was found through experiments that the optimal pH value for SS removal in restaurant wastewater is between 7.5 and 8.0.

[0034] Exemplarily, the alkali solution adding device is an alkali solution delivery pump 3, which is used to deliver the prepared NaOH solution to the pipeline mixer 6. Specifically, the number of alkali solution delivery pumps 3 can be multiple, and the input ends of the multiple alkali solution delivery pumps 3 are all connected to the output end of the NaOH preparation device, and the output ends of the multiple alkali solution delivery pumps 3 are all connected to the input end of the pipeline mixer 6. Figure 1 In the illustrated embodiment, there are two alkali solution delivery pumps 3 . It is understandable that the specific number of the alkali solution delivery pumps 3 is not limited and can be set according to actual needs.

[0035] In some embodiments, the flocculant mixing and adding module includes a flocculant dosing device, a flocculant mixing device and a flocculant adding device, the output end of the flocculant dosing device is connected to the flocculant inlet of the flocculant mixing device, the output end of the flocculant mixing device is connected to the input end of the flocculant adding device, and the output end of the flocculant adding device is connected to the input end of the homogenizing device 11.

[0036] The food waste water contains a large amount of negatively charged colloids, particles, etc., and it is necessary to add appropriate flocculants to effectively flocculate the SS in the waste water so that the dehydration module can perform dehydration treatment. The flocculant dosing device adds the solid flocculant to the flocculant preparation device so that the flocculant preparation device completes the concentration preparation, and the prepared flocculant is further added to the homogenizing device 11 through the flocculant dosing device so that the prepared flocculant and the food waste water mixed with the NaOH solution can be fully reacted and homogenized in the homogenizing device 11. Exemplarily, the flocculant dosing device and the flocculant preparation device can be an integrated flocculation dosing device 8, which can complete the dosing of the flocculant and the preparation of the flocculant; that is, in this embodiment, after the integrated flocculation dosing device 8 completes the preparation of the flocculant, the flocculant is transported to the homogenizing device 11 of the dehydration module through the flocculant dosing device and the matching conveying pipeline. The flocculant dosing device may be a flocculant dosing pump 9, and the number of flocculant dosing pumps 9 may be multiple. In this case, the input ends of the multiple flocculant dosing pumps 9 are connected to the output ends of the flocculant mixing device, and the output ends of the multiple flocculant dosing pumps 9 are connected to the homogenizing device 11 of the desludging module. Figure 1 In the illustrated embodiment, the number of the flocculant dosing pumps 9 is two. It can be understood that the number of the flocculant dosing pumps 9 listed in this embodiment is only a specific example. In other embodiments, the number of the flocculant dosing pumps 9 can be more.

[0037] In the above embodiment, the flocculant preparation and addition module is used to complete the preparation and addition of flocculants. The inventor conducted experiments based on the suspended matter removal system of the present application and concluded that a cationic flocculant with high ionicity and molecular equivalent greater than 8 million is used, and its concentration ratio is preferably about 0.4%.

[0038] Furthermore, the dehydration module may include a mixing device 10 in addition to the homogenizing device 11 and the desludging device, wherein the first input end of the mixing device 10 is connected to the output end of the flocculant preparation and addition module, the second input end of the mixing device 10 is connected to the output end of the pipeline mixer 6, and the output end of the mixing device 10 is connected to the input end of the homogenizing device 11. Figure 1 It can be seen that the mixing device 10 is located at the front end of the homogenizing device 11, and the mixing device 10 receives the food waste water mixed with NaoH alkali solution (food waste water with adjusted pH) output by the pipeline mixer 6 and the adjusted flocculant delivered by the flocculant dosing pump 9, and fully mixes the flocculant and the food waste water with adjusted pH, and delivers them to the homogenizing device 11 after mixing.

[0039] The food waste water mixed with flocculants flows into the homogenizing device 11 by gravity, and is fully reacted and homogenized in the homogenizing device 11. The food waste water mixed with flocculants stays in the homogenizing device 11 for a certain time by adjusting the water inlet of the food waste water to achieve full reaction. Further, the food waste water homogenized in the homogenizing device 11 flows into the desludging device by gravity for desludging. Exemplarily, the desludging device can be a screw stacking machine 12; as a solid-liquid separation device, the screw stacking dewatering machine was introduced into my country relatively late and is mainly used in the sludge dewatering process of sewage treatment plants; the screw stacking sludge dewatering machine has many advantages in sludge dewatering, such as low power consumption, self-cleaning, automatic continuous operation, good sanitary conditions, etc.; in the food waste water suspended solids removal system, after the food waste water is desludified in the screw stacking machine 12, the sludge is further discharged through the sludge outlet 13, and the desludified wastewater is discharged through the water outlet 14.

[0040] In some embodiments of the present invention, the system for removing suspended solids from kitchen waste water further comprises a safety valve 4, which is arranged between the alkali solution dosing device and the pipeline mixer 6. Figure 1 It can be seen that the safety valve 4 is specifically located on the delivery pipeline at the output end of the alkali solution delivery pump 3. Further, the kitchen waste wastewater suspended solids removal system may also include a damper, which is located between the safety valve 4 and the pipeline mixer 6; Figure 1 The safety valve 4 and the damping valve 5 are both located on the delivery pipeline at the output end of the alkali solution delivery pump 3 , that is, it can also be understood that the safety valve 4 and the damping valve 5 are both located on the alkali solution delivery pipeline of the pipeline mixer 6 .

[0041] In another embodiment, the system for removing suspended solids from food waste water comprises an electric regulating valve 7, which is located between the pipeline mixer 6 and the mixing device 10. The electric regulating valve 7 is used to adjust the flow rate of the food waste water entering the mixing device 10 to ensure that the food waste water mixed with flocculants in the homogenizing device 11 has sufficient reaction time.

[0042] The suspended solids removal system for food waste wastewater in the present application can be applied to various stages of food waste wastewater treatment. For example, in the first stage, the system can effectively remove SS and grease in the food waste wastewater; in the second stage, the system can perform secondary removal of SS in the food waste wastewater after grease extraction; in the third stage, the system can effectively remove SS in the biochemical sludge of food waste wastewater.

[0043] Through the above embodiments, it can be found that since the restaurant wastewater is quite different from domestic sewage, it needs to be effectively pretreated before the spiral stacking machine removes SS, that is, adjust the physical and chemical properties of the restaurant wastewater, and the adjustment content includes adjusting the appropriate pH, selecting the appropriate flocculant, the amount of flocculant added, the amount of wastewater inflow, etc. Therefore, based on the specific properties of the restaurant wastewater, the inventor has developed a restaurant wastewater suspended solids removal system. The system first adjusts the appropriate pH for the restaurant wastewater, and prepares the appropriate flocculant for the restaurant wastewater, and then effectively dehydrates the restaurant wastewater after the flocculation reaction through the spiral stacking machine, thereby reducing the treatment cost of the restaurant wastewater to a minimum.

[0044] Through the above embodiments, it can be found that the suspended solids removal system of the kitchen waste water of the present application includes a pH adjustment module, a pipeline mixer, a flocculant preparation and addition module and a dehydration module, and the pH adjustment module includes an alkali solution dosing device, a NaoH preparation device and an alkali solution adding device, and the dehydration module includes a homogenizing device and a desludging device, and the alkali solution adding device is used to add the prepared alkali solution to the pipeline mixer, so that the prepared alkali solution and the kitchen waste water are fully mixed in the pipeline mixer, and the kitchen waste water after the alkali solution and the waste water are fully mixed is input to the homogenizing device, and reacts and homogenizes with the flocculant added by the flocculant preparation and addition module in the homogenizing device, and then the homogenized kitchen waste water is transported to the desludging device for desludging. Before the kitchen waste water is desludged by the desludging device, the system pre-treats the kitchen waste water and adjusts the physical and chemical properties of the waste water, so that the system can not only efficiently remove suspended solids in the kitchen waste water, but also has an ideal SS removal effect.

[0045] In the present invention, features described and / or illustrated for one embodiment may be used in the same manner or in a similar manner in one or more other embodiments, and / or combined with features of other embodiments or replace features of other embodiments.

[0046] The above-listed embodiments show and describe the basic principles and main features of the utility model, but the utility model is not limited to the above-mentioned embodiments. Any modifications, equivalent changes and modifications made to the utility model by those skilled in the art without making any creative work should fall within the scope of protection of the technical solution of the utility model.

Claims

1. A system for removing suspended matter from kitchen waste water, characterized in that: The suspended solids removal system includes a pH adjustment module, a pipeline mixer, a flocculant preparation and addition module, and a dehydration module; The pH regulating module comprises an alkali solution dosing device, a NaoH mixing device and an alkali solution adding device, wherein the output end of the alkali solution dosing device is connected to the alkali solution inlet of the NaoH mixing device, the output end of the NaoH mixing device is connected to the input end of the alkali solution adding device, and the output end of the alkali solution adding device is connected to the input end of the pipeline mixer; The dehydration module comprises a homogenizing device and a desludging device. The input end of the homogenizing device is connected to the output end of the flocculant mixing and adding module and the output end of the pipeline mixer. The input end of the desludging device is connected to the output end of the homogenizing device.

2. The system for removing suspended solids from kitchen waste water according to claim 1, characterized in that: The flocculant mixing and adding module includes a flocculant dosing device, a flocculant mixing device and a flocculant adding device. The output end of the flocculant dosing device is connected to the flocculant inlet of the flocculant mixing device, the output end of the flocculant mixing device is connected to the input end of the flocculant adding device, and the output end of the flocculant adding device is connected to the input end of the homogenizing device.

3. The system for removing suspended solids from kitchen waste water according to claim 1, characterized in that: The dehydration module comprises a mixing device, a first input end of the mixing device is connected to an output end of the flocculant preparation and addition module, a second input end of the mixing device is connected to an output end of the pipeline mixer, and an output end of the mixing device is connected to an input end of the homogenizing device.

4. The system for removing suspended solids from kitchen waste water according to claim 1, characterized in that: The desludging device is a screw stacking machine.

5. The system for removing suspended solids from kitchen waste water according to claim 2, characterized in that: The alkali solution adding device is an alkali solution delivery pump.

6. The system for removing suspended solids from kitchen waste water according to claim 5, characterized in that: The flocculant dosing device is a flocculant dosing pump.

7. The system for removing suspended solids from kitchen waste water according to claim 1, characterized in that: The system further comprises a safety valve, which is arranged between the alkali solution dosing device and the pipeline mixer.

8. The system for removing suspended solids from kitchen waste water according to claim 7, characterized in that: The system further includes a damper located between the safety valve and the pipeline mixer.

9. The system for removing suspended solids from kitchen waste water according to claim 3, characterized in that: The system includes an electric regulating valve located between the pipeline mixer and the mixing device.

10. The system for removing suspended solids from kitchen waste water according to claim 6, characterized in that: The number of the alkali solution delivery pump and the flocculant dosing pump is multiple.

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