System for treating catering sewage
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING XINCHENG YULU ENVIRONMENTAL TECH CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-07-07
Smart Images
Figure CN224467645U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of restaurant wastewater treatment, and more particularly to a restaurant wastewater treatment system. Background Technology
[0002] Food wastewater is a type of high-concentration organic wastewater discharged from the catering industry and food processing processes. Its main characteristics include high levels of grease, fatty acids, suspended solids, and organic pollutants. The grease components primarily consist of animal and vegetable oils, existing in the wastewater in three forms: free, dispersed, and emulsified. Emulsified oil, in particular, is difficult to separate effectively through simple settling or physical methods because it mixes thoroughly with water during washing or agitation and forms a stable emulsion under the action of surfactants. Emulsified oil not only increases the difficulty of wastewater treatment but also affects microbial activity and reduces the efficiency of biological treatment in subsequent processes. Furthermore, grease can form an oil film in natural water bodies, hindering oxygen exchange and damaging aquatic ecosystems; therefore, effective treatment measures are essential for its removal.
[0003] Currently, the treatment of catering wastewater typically employs a combined process of "pretreatment and biological treatment." Wastewater first enters a collection tank for flow regulation, then is pumped to a hydraulic screen located at the top of the anaerobic tank to remove larger suspended solids and fibrous impurities, preventing clogging of subsequent equipment. The pre-filtered wastewater then sequentially enters the anaerobic tank, anoxic tank, aerobic tank, and membrane bioreactor (MBR). Through the synergistic action of microorganisms in different functional zones, organic matter degradation, nitrogen and phosphorus removal, and other objectives are achieved. During this process, the system enhances the treatment effect through a multi-stage reflux method from the membrane tank to the aerobic tank, from the aerobic tank to the anoxic tank, and from the anoxic tank to the anaerobic tank. Finally, the effluent separated by the MBR is pumped to a metering channel for discharge after meeting standards. To maintain sludge activity, existing technologies typically install submersible agitators at the bottom of the anaerobic and anoxic tanks to keep the sludge in suspension through mechanical agitation, thereby improving reaction efficiency.
[0004] While existing wastewater treatment systems for catering establishments have achieved some degree of removal of organic matter and nutrients, several shortcomings remain. First, the systems suffer from poor operational stability, particularly when influent water quality fluctuates significantly, easily leading to biological system collapse. Second, equipment energy consumption is high, especially the operating costs of submersible mixers and membrane bioreactor systems, which account for a large proportion of the overall cost, limiting their application in small and medium-sized catering establishments. Third, treatment efficiency is low, especially when dealing with wastewater with high oil content; traditional physicochemical pretreatment methods are ineffective in breaking down emulsified oil, increasing the burden on subsequent biological systems and reducing overall treatment efficiency. Theoretically, to address these issues, demulsifiers can be added to promote oil-water separation. Calcium hydroxide, under alkaline conditions, can cause the oil to undergo a saponification reaction to produce sodium stearate, which is then added with calcium chloride to form precipitable calcium stearate, thus achieving efficient oil removal. Simultaneously, phosphates and organic acid salts in the wastewater can also be removed by precipitating with calcium ions. Finally, flocculants are added to promote sludge coagulation and sedimentation, achieving sludge-water separation. This method has shown good treatment results in laboratory studies, but currently, there is no integrated treatment system capable of fully implementing these steps. Therefore, developing a restaurant wastewater treatment system that is structurally sound, easy to operate, and highly efficient has become an urgent need to overcome current technological bottlenecks. Utility Model Content
[0005] This application provides a wastewater treatment system for catering establishments, addressing the technical problem in the prior art that there is no treatment system that chemically reacts with grease in catering wastewater. The technical solution is as follows:
[0006] This application provides a wastewater treatment system for catering, comprising: a collection tank for receiving catering wastewater after filtering out debris and garbage; a mixing mechanism connected to the collection tank, wherein the catering wastewater in the collection tank is discharged into the mixing mechanism, and a target agent in the mixing mechanism can chemically react with the catering wastewater; a sedimentation mechanism connected to the mixing mechanism for extracting the chemically reacted catering wastewater in the mixing mechanism for sedimentation and separation, so as to separate the catering wastewater into supernatant and sludge in the sedimentation mechanism, and the supernatant discharged by the sedimentation mechanism for biochemical treatment; and a sludge treatment mechanism connected to the sedimentation mechanism for extracting sludge in the sedimentation mechanism for sludge desludge treatment.
[0007] In one embodiment, the mixing mechanism includes: a reaction vessel connected to a collection tank and a sedimentation mechanism, for the target agent and catering wastewater to undergo a chemical reaction in the reaction vessel; a dosing device connected to the reaction vessel for dosing the target agent into the reaction vessel; and a stirring component disposed on the reaction vessel for stirring the target agent and catering wastewater in the reaction vessel.
[0008] In one embodiment, the reaction vessel includes: a first container connected to a water collection tank, wherein wastewater from the water collection tank is discharged into the first container to undergo a first chemical reaction; and a second container connected to the first container, wherein wastewater from the first container is discharged into the second container to undergo a second chemical reaction.
[0009] The first container and the second container are each equipped with a stirring component.
[0010] In one embodiment, the dosing device includes: a first dosing device connected to a first container for dispensing a demulsifying agent into the first container; a second dosing device connected to the first container for dispensing a calcium chloride agent into the first container; a third dosing device connected to the first container for dispensing a sodium hydroxide agent into the first container; and a fourth dosing device connected to a second container for dispensing a flocculant into the second container.
[0011] In one embodiment, the sedimentation mechanism includes a third container connected to the mixing mechanism and the sludge treatment mechanism, so that the catering wastewater can be separated by sedimentation in the third container and the sludge in the third container can be discharged into the sludge treatment mechanism.
[0012] In one embodiment, the sedimentation mechanism further includes a fourth container connected to the third container and the sludge treatment mechanism. The supernatant in the third container is discharged into the fourth container for sedimentation and separation, and the sludge in the fourth container is discharged into the sludge treatment mechanism. The supernatant in the fourth container is discharged and then subjected to biochemical treatment.
[0013] In one embodiment, the sludge treatment apparatus includes: a fifth container connected to a sedimentation mechanism for storing sludge; and a sludge desludge device connected to the fifth container, wherein the sludge in the fifth container is discharged into the sludge desludge device for desludge treatment.
[0014] In one embodiment, the sludge treatment apparatus further includes a sludge screw pump, wherein the fifth container and the desludge dewatering equipment are connected via the sludge screw pump for providing power to the sludge in the fifth container to flow into the desludge dewatering equipment.
[0015] In one embodiment, it further includes: a sewage pump, a collection tank and a mixing mechanism connected by the sewage pump, for providing power to allow catering wastewater in the collection tank to flow into the mixing mechanism.
[0016] Compared with existing technologies, the catering wastewater treatment system proposed in the above technical solution integrates key technologies such as chemical demulsification, saponification reaction, and flocculation sedimentation into the catering wastewater treatment process for the first time. By adding target agents (such as calcium hydroxide, calcium chloride, demulsifiers, and flocculants) to the wastewater in the mixing unit, oily substances undergo saponification under alkaline conditions to produce sodium stearate, which further combines with calcium ions to form precipitable calcium stearate, thus achieving oil-water separation. This process not only effectively removes free oil and emulsified oil but also simultaneously removes pollutants such as organic acid salts and phosphates from the wastewater, significantly reducing the load on subsequent biological treatment systems and improving overall treatment efficiency. After the chemical reaction is completed in the sedimentation unit, the wastewater is separated into supernatant and sludge after sufficient sedimentation. The sludge is transported to a sludge treatment unit for desludge treatment, achieving sludge reduction and resource utilization. This not only reduces sludge volume and lowers sludge transportation and disposal costs but also avoids secondary pollution problems caused by high sludge moisture content in traditional processes, contributing to the construction of a clean and environmentally friendly wastewater treatment system.
[0017] In summary, this invention provides a compact, functional, and stable wastewater treatment system for catering establishments, which is particularly suitable for the chemical reaction treatment of wastewater with high oil content. It solves the problem of the lack of targeted treatment methods in the prior art and has significant technological advancement and practical application value.
[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description
[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.
[0020] Figure 1 This is a schematic diagram of the structure of the wastewater treatment system for catering in this application.
[0021] Figure label:
[0022] 1. Water collection tank; 2. First container; 3. Second container; 4. Third container; 5. Fourth container; 6. Fifth container; 7. Sludge removal equipment; 8. Agitator;
[0023] 101. Sewage pump; 201. First dosing device; 202. Second dosing device; 203. Third dosing device; 301. Fourth dosing device; 701. Sludge screw pump. Detailed Implementation
[0024] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.
[0025] Reference Figure 1 As shown, an embodiment of this application proposes a wastewater treatment system for catering establishments. This system may include: a collection tank 1 for receiving catering wastewater after filtering out debris and garbage; a mixing mechanism connected to the collection tank 1, into which the catering wastewater is discharged, and a target agent in the mixing mechanism reacts chemically with the catering wastewater; a sedimentation mechanism connected to the mixing mechanism for extracting the chemically reacted catering wastewater for sedimentation and separation, separating the catering wastewater into supernatant and sludge in the sedimentation mechanism, and discharging the supernatant for biochemical treatment; and a sludge treatment mechanism connected to the sedimentation mechanism for extracting sludge in the sedimentation mechanism for desludge treatment.
[0026] Specifically, in the technical solution adopted in this application, catering wastewater can be filtered by a bar screen or a device with a filter to remove solid particulate matter. The filtered catering wastewater is then discharged into a collection tank 1 for storage. The catering wastewater in the collection tank 1 is then discharged into a mixing mechanism, where it is fully mixed with the target agent and undergoes a chemical reaction. The chemically reacted catering wastewater is then discharged from the mixing mechanism to a sedimentation mechanism for sedimentation and separation. After a predetermined sedimentation time following the chemical reaction, the catering wastewater in the sedimentation mechanism separates into supernatant and sludge. The sedimentation mechanism discharges the sludge into a sludge treatment mechanism for desludge treatment, while the supernatant is discharged from the sedimentation mechanism for biochemical treatment. This allows for the proper treatment of catering wastewater using the treatment system proposed in this application, effectively reducing water pollution and treatment costs caused by catering wastewater, improving the efficiency of catering wastewater treatment, and simplifying the steps for treating grease and fat in catering wastewater, thereby reducing the difficulty of degrading catering wastewater.
[0027] Furthermore, refer to Figure 1As shown, in some embodiments, the mixing mechanism includes: a reaction vessel connected to the collection tank 1 and the sedimentation mechanism, for the target agent and catering wastewater to undergo a chemical reaction in the reaction vessel; a dosing device connected to the reaction vessel for dosing the target agent into the reaction vessel; and a stirring component 8 disposed on the reaction vessel for stirring the target agent and catering wastewater in the reaction vessel.
[0028] Specifically, in the technical solution adopted in this application, in order to achieve a thorough and effective chemical reaction between the wastewater and the target agent in the mixing mechanism, the mixing mechanism may include: a reaction vessel connecting the collection tank 1 and the sedimentation mechanism, a dosing device connecting the reaction vessel, and a stirring component 8 disposed on the reaction vessel. In use, the wastewater from the collection tank 1 is discharged into the reaction vessel, and the dosing device adds the target agent to the reaction vessel according to the amount of wastewater in the reaction vessel. After dosing, the stirring component 8 is activated to agitate the target agent and wastewater in the reaction vessel, so that the target agent and wastewater are fully mixed and undergo a chemical reaction.
[0029] Furthermore, refer to Figure 1 As shown, in some embodiments, the reaction vessel includes: a first container 2 connected to a water collection tank 1, wherein the catering wastewater in the water collection tank 1 is discharged into the first container 2 to undergo a first chemical reaction; and a second container 3 connected to the first container 2, wherein the catering wastewater in the first container 2 is discharged into the second container 3 to undergo a second chemical reaction; wherein the first container 2 and the second container 3 are respectively equipped with stirring components 8.
[0030] Furthermore, refer to Figure 1 As shown, in some embodiments, the dosing device includes: a first dosing device 201, connected to a first container 2, for dosing a demulsifying agent into the first container 2; a second dosing device 202, connected to the first container 2, for dosing a calcium chloride agent into the first container 2; a third dosing device 203, connected to the first container 2, for dosing a sodium hydroxide agent into the first container 2; and a fourth dosing device 301, connected to a second container 3, for dosing a flocculant into the second container 3.
[0031] Specifically, in the technical solution adopted in this application, since most of the grease in catering wastewater remains as emulsified oil, it needs to be explained that emulsified oil is the grease and waste in catering wastewater that easily mixes with water to form an emulsion liquid. Referring to the oil content in the catering wastewater in the first container 2, an appropriate amount of demulsifying agent can be added to the first container 2 through the first dosing device 201, so that the grease reacts with a strong alkali under alkaline conditions to produce sodium stearate, forming a suspension. Subsequently, calcium chloride agent is added to the first container 2 through the second dosing device 202 to generate precipitable calcium stearate in the catering wastewater in the first container 2, thereby raising the pH value of the catering wastewater from approximately 3-4 to 10. Simultaneously, the precipitate formed by organic acid salts, phosphates, and calcium ions in the catering wastewater is in a state that can be separated from water. Finally, sodium hydroxide is added to the first container 2 via the third dosing device 203. The grease in the wastewater hydrolyzes in the sodium hydroxide solution to generate free fatty acids, which immediately neutralize with the sodium hydroxide to produce sodium fatty acids (soap) and glycerin. After the wastewater in the first container 2 has fully reacted, the suspended solids are discharged into the second container 3.
[0032] In this embodiment, a flocculant can be added to the second container 3 through the fourth dosing device 301. The flocculant can be a cationic PAM flocculant, so that the suspended matter can be fully mixed with the flocculant in the second container 3 and then discharged from the sedimentation mechanism for flocculation.
[0033] In this embodiment, the reaction equation in the mixing mechanism is:
[0034] (C17H35COO)3C3H5 + 3NaOH === {heating} 3C17H35COONa + C3H5(OH)3
[0035] Sodium stearate (C17H35COONa) and calcium chloride (CaCl2)
[0036] 2C17H35COONa + CaCl2===Ca(C17H35COO)2↓ + 2NaCl
[0037] Furthermore, refer to Figure 1 As shown, in some embodiments, the sedimentation mechanism includes a third container 4, which connects the mixing mechanism and the sludge treatment mechanism, so that the catering wastewater can be sedimented and separated in the third container 4, and the sludge in the third container 4 is discharged into the sludge treatment mechanism.
[0038] Specifically, in the technical solution adopted in this application, the third container 4 is used to receive the suspended matter in the second container 3 to which flocculant has been added, and the suspended matter undergoes mud-water separation in the third container 4 to separate the suspended matter into supernatant and sludge. The sludge in the third container 4 is discharged into a sludge treatment facility for desludge treatment, while the supernatant in the third container 4 can be discharged for biochemical treatment.
[0039] Furthermore, refer to Figure 1 As shown, in some embodiments, the sedimentation mechanism further includes a fourth container 5, which is connected to the third container 4 and the sludge treatment mechanism. The supernatant in the third container 4 is discharged into the fourth container 5 for sedimentation and separation, and the sludge in the fourth container 5 is discharged into the sludge treatment mechanism. The supernatant in the fourth container 5 is discharged and then subjected to biochemical treatment.
[0040] Specifically, in the technical solution adopted in this application, in order to further optimize the sludge-water separation step, the sedimentation mechanism may include a third container 4 and a fourth container 5. In use, the third container 4 is used to receive the suspended solids in the second container 3 to which flocculants have been added, and the suspended solids undergo sludge-water separation in the third container 4 to separate the suspended solids into supernatant and sludge. The sludge in the third container 4 is discharged into the sludge treatment mechanism for desludge treatment, while the supernatant in the third container 4 can be discharged into the fourth container 5 for a second sludge-water separation. The sludge in the fourth container 5 is discharged into the sludge treatment mechanism for desludge treatment, while the supernatant in the fourth container 5 can be discharged for biochemical treatment.
[0041] Furthermore, refer to Figure 1 As shown, in some embodiments, the sludge treatment mechanism includes: a fifth container 6, connected to a sedimentation mechanism, for storing sludge; and a sludge desludge device 7, connected to the fifth container 6, wherein the sludge in the fifth container 6 is discharged into the sludge desludge device 7 for desludge treatment.
[0042] Furthermore, refer to Figure 1 As shown, in some embodiments, the sludge treatment mechanism further includes a sludge screw pump 701, and the fifth container 6 and the desludge dewatering device 7 are connected through the sludge screw pump 701 to provide power for the sludge in the fifth container 6 to flow into the desludge dewatering device 7.
[0043] Specifically, in the technical solution adopted in this application, the sludge settled in the third container 4 and / or the fourth container 5 can be discharged into the fifth container 6 for sludge concentration, and the concentrated sludge is then transported to the desludge dewatering equipment 7 for desludge treatment via the sludge screw pump 701.
[0044] Furthermore, refer to Figure 1As shown, in some embodiments, it also includes: a sewage pump 101, the collection tank 1 and the mixing mechanism are connected through the sewage pump 101, which is used to provide power for the catering sewage in the collection tank 1 to flow into the mixing mechanism.
[0045] It should be explained that after the chemical reaction and flocculation sedimentation to remove the grease, the chemical oxygen demand (COD) is reduced. At this time, the COD of the supernatant is about 700 and the pH value is about 9, which can meet the requirements of biochemical decontamination. The supernatant discharged from the third container 4 or the fourth container 5 is then subjected to two-stage anaerobic biochemical treatment, one-stage aerobic biochemical treatment, and sedimentation separation or membrane bioreactor. The separated water can meet the discharge requirements.
[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.
[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.
[0048] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process. Furthermore, the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functionality involved.
[0049] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus or device (such as a computer-based system, a processor-included system or other system that can fetch and execute instructions from, an instruction execution system, apparatus or device).
[0050] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. All or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware, the program being stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiments.
[0051] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. This storage medium can be a read-only memory, a disk, or an optical disk, etc.
[0052] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A wastewater treatment system for catering establishments, characterized in that, include: A collection tank is used to receive wastewater from catering establishments after filtering out debris and garbage. A mixing mechanism is connected to the collection tank, and the catering wastewater in the collection tank is discharged into the mixing mechanism. The target agent in the mixing mechanism can chemically react with the catering wastewater. A sedimentation mechanism, connected to the mixing mechanism, is used to extract the catering wastewater that has completed the chemical reaction in the mixing mechanism for sedimentation and separation, so as to separate the catering wastewater into supernatant and sludge in the sedimentation mechanism, and the sedimentation mechanism discharges the supernatant for biochemical treatment. as well as, A sludge treatment unit, connected to the sedimentation unit, is used to extract the sludge in the sedimentation unit for desludge treatment.
2. The wastewater treatment system for catering establishments according to claim 1, characterized in that, The hybrid mechanism includes: A reaction vessel, connected to the water collection tank and the sedimentation mechanism, is provided for the target reagent to react chemically with the catering wastewater in the reaction vessel; A dosing device, connected to the reaction vessel, is used to dispense the target agent into the reaction vessel; A stirring component, disposed on the reaction vessel, is used to agitate the target reagent and the wastewater in the reaction vessel.
3. The wastewater treatment system for catering establishments according to claim 2, characterized in that, The reaction vessel includes: A first container is connected to the water collection tank, and the catering wastewater in the water collection tank is discharged into the first container to undergo a first chemical reaction; The second container is connected to the first container, and the wastewater from the catering service in the first container is discharged into the second container to undergo a second chemical reaction; The first container and the second container are respectively equipped with the stirring component.
4. The wastewater treatment system for catering establishments according to claim 3, characterized in that, The drug delivery device includes: A first dosing device, connected to the first container, is used to dispense demulsifying agent into the first container; The second dosing device is connected to the first container and is used to add calcium chloride to the first container. The third dosing device is connected to the first container and is used to add sodium hydroxide to the first container; The fourth dosing device is connected to the second container and is used to add flocculant to the second container.
5. The wastewater treatment system for catering establishments according to claim 1, characterized in that, The precipitation mechanism includes: The third container connects the mixing mechanism and the sludge treatment mechanism, so that the catering wastewater can be settled and separated in the third container, and the sludge in the third container can be discharged into the sludge treatment mechanism.
6. The wastewater treatment system for catering establishments according to claim 5, characterized in that, The precipitation mechanism also includes: The fourth container is connected to the third container and the sludge treatment mechanism. The supernatant in the third container is discharged into the fourth container for sedimentation and separation, and the sludge in the fourth container is discharged into the sludge treatment mechanism. The supernatant in the fourth container is discharged and then subjected to biochemical treatment.
7. The wastewater treatment system for catering establishments according to claim 1, characterized in that, The sludge treatment facility includes: The fifth container, connected to the sedimentation mechanism, is used to store the sludge; The sludge desludge equipment is connected to the fifth container, and the sludge in the fifth container is discharged into the sludge desludge equipment for desludge treatment.
8. The wastewater treatment system for catering establishments according to claim 7, characterized in that, The sludge treatment facility also includes: A sludge screw pump is provided, which connects the fifth container and the desludge removal equipment, and is used to provide power for the sludge in the fifth container to flow into the desludge removal equipment.
9. The wastewater treatment system for catering establishments according to claim 1, characterized in that, Also includes: A sewage pump is provided, and the collection tank and the mixing mechanism are connected by the sewage pump, which is used to provide power for the catering wastewater in the collection tank to flow into the mixing mechanism.