Wastewater treatment system

Abstract

The invention discloses a wastewater treatment system, and belongs to the field of water treatment. The wastewater treatment system comprises an adjusting tank, a pretreatment unit, a treatment unit, a water outlet unit and a water inlet adjusting unit which are connected in sequence, the water inlet adjusting unit comprises a yeast tank and an adjusting device, the yeast tank comprises yeast liquid, and the adjusting device can detect COD values of the adjusting tank and the yeast tank. The volume of the yeast liquid added into the pretreatment unit is regulated and controlled on the basis of the detected COD value. The invention discloses a wastewater treatment system which can eliminate the fluctuation influence of wastewater inflow and ensure that effluent stably reaches the standard all the time.

Description

Technical Field

[0001] The invention belongs to the field of water treatment, and in particular relates to a wastewater treatment system. Background Art

[0002] Beer wastewater originates from different process stages of beer production, including saccharification, fermentation, filling, bottle washing and daily sewage, etc. Among them, the wastewater from the saccharification process has the highest organic matter content, with COD of 5000-10000 mg / L, which is weakly acidic wastewater (pH 5-7); the organic matter content of the wastewater from the fermentation process is second, with COD of 2000-3000 mg / L, which is also weakly acidic wastewater (pH 5-7); the organic matter content of the wastewater from the filling process is relatively low; the wastewater from the bottle washing process is mainly alkaline wastewater (pH 8-14).

[0003] The physical and chemical properties of wastewater generated in different process stages vary greatly. Wastewater from saccharification and fermentation processes is mainly discharged intermittently, while filling and bottle washing processes are relatively continuous. In addition, beer production often has the characteristics of off-season and peak season, and the differences in drainage timing and physical and chemical properties of different processes bring great challenges to the stable operation of beer wastewater treatment technology. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the prior art at least to a certain extent. To this end, the present invention provides a wastewater treatment system capable of reducing the fluctuation of wastewater inflow.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A wastewater treatment system comprises a regulating tank, a pretreatment unit, a treatment unit and a water outlet unit connected in sequence, and also comprises

[0007] The water inlet regulating unit comprises a yeast pool and a regulating device, wherein the yeast pool is connected to the pretreatment unit, the yeast pool comprises yeast liquid, and the regulating device is capable of detecting COD values ​​of the regulating pool and the yeast pool, and adjusting the volume of the yeast liquid added to the pretreatment unit based on the detected COD value.

[0008] In another embodiment of the present invention, the regulating device includes a COD online monitoring system, a metering pump and a first control system. The COD online detection system is used to detect the COD values ​​of the regulating tank and the yeast tank. The metering pump connects the yeast tank and the pretreatment unit. The first control system is connected to the COD online monitoring system and adjusts the frequency of the metering pump according to the detected COD value.

[0009] In another embodiment of the present invention, the yeast pool comprises waste yeast.

[0010] In another embodiment of the present invention, the COD value of the yeast liquid in the yeast pool is higher than the COD value of the wastewater in the regulating pool.

[0011] In another embodiment of the present invention, the water outlet unit includes a water outlet buffer pool, the water outlet buffer pool has a water outlet and a water inlet, the water outlet is higher than the water inlet, so that the water outlet buffer pool is overflow water.

[0012] In another embodiment of the present invention, the water outlet unit also includes a circulation unit, the circulation unit includes a circulation pump and a circulation pipeline, the circulation pipeline connects the water outlet unit and the regulating tank, and the circulation pump system transports the wastewater in the water outlet unit to the regulating tank through the circulation pipeline.

[0013] In another embodiment of the present invention, the flow rate of the circulation pipeline is 2 to 3 times the sewage treatment flow rate of the treatment unit.

[0014] In another embodiment of the present invention, the circulation unit also includes a second control system and a water outlet monitoring system, the second control system controls the operation of the circulation pump, and the water outlet monitoring system detects the wastewater indicators of the water outlet unit and compares them with preset indicators. If any one of the wastewater indicators of the water outlet unit is higher than the preset indicator, the second control system starts the circulation pump.

[0015] In another embodiment of the present invention, the wastewater indicators include chemical oxygen demand, ammonia nitrogen, total nitrogen and total phosphorus.

[0016] In another embodiment of the present invention, the treatment unit includes an anaerobic unit and an aerobic unit.

[0017] In another embodiment of the present invention, the circulation unit further comprises an alarm, which is connected to the second control system. If any one of the wastewater indicators of the water outlet unit is higher than the preset indicator, the alarm is activated.

[0018] The beneficial effects of the present invention compared with the prior art are:

[0019] Mix spent yeast liquid with brewing wastewater to regulate influent fluctuations, while increasing the organic matter content of influent to increase biogas production in the wastewater treatment system;

[0020] Use the COD online monitoring system, metering pump and first control system to monitor the COD of the waste yeast liquid and the COD of the wastewater in the regulating tank in real time and control the compounding ratio of the waste yeast liquid and the wastewater according to the detected values ​​to reduce the fluctuation of the influent water quality;

[0021] The water flow mode of the effluent buffer tank is bottom-in and top-out, and overflows to the external drainage point, which can balance the water quality, avoid the large-scale discharge of unqualified sewage, and reduce the impact of water quality fluctuations;

[0022] The flow rate of the circulating pump installed at the water outlet is 2 to 3 times the treatment volume. The water in the outlet buffer tank is pumped back to the regulating tank through the circulating pump. No wastewater will be discharged during the pumping process.

[0023] The second control system and the water outlet monitoring system can detect the wastewater indicators at the outlet and compare them with the preset indicators, so as to deal with the wastewater exceeding the standards in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the workflow of the automatic system for early warning and response to excessive standards for beer wastewater treatment provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of an automated system for early warning and response to excessive standards in beer wastewater treatment provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following description provides specific application scenarios and requirements of this specification, with the purpose of enabling those skilled in the art to make and use the contents of this specification. Various local modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but to the widest scope consistent with the claims.

[0028] The terms used herein are only used for the purpose of describing specific example embodiments and are not restrictive. For example, unless the context clearly indicates otherwise, as used herein, the singular forms "a", "an" and "the" may also include plural forms. When used in this specification, the terms "include", "comprise" and / or "contain" mean that the associated integers, steps, operations, elements and / or components exist, but do not exclude the existence of one or more other features, integers, steps, operations, elements, components and / or groups or that other features, integers, steps, operations, elements, components and / or groups may be added in the system / method.

[0029] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0030] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0031] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In view of the following description, these and other features of the present specification, as well as the operation and function of the related elements of the structure, and the economy of the combination and manufacture of the parts can be significantly improved. Reference is made to the accompanying drawings, all of which form a part of this specification. However, it should be clearly understood that the drawings are for illustration and description purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not drawn to scale.

[0033] Beer wastewater originates from different process stages of beer production, including saccharification, fermentation, filling, bottle washing and daily sewage, etc. Among them, the wastewater from the saccharification process has the highest organic matter content, with COD of 5000-10000 mg / L, which is weakly acidic wastewater (pH 5-7); the organic matter content of the wastewater from the fermentation process is second, with COD of 2000-3000 mg / L, which is also weakly acidic wastewater (pH 5-7); the organic matter content of the wastewater from the filling process is relatively low; the wastewater from the bottle washing process is mainly alkaline wastewater (pH 8-14).

[0034] The physical and chemical properties of wastewater generated in different process stages vary greatly. Wastewater from saccharification and fermentation processes is mainly discharged intermittently, while filling and bottle washing processes are relatively continuous. In addition, beer production often has the characteristics of off-season and peak season, and the differences in drainage timing and physical and chemical properties of different processes bring great challenges to the stable operation of beer wastewater treatment technology.

[0035] like Figure 1 and Figure 2 As shown, according to the commonly used water treatment process, various types of brewing wastewater in production first enter the regulating tank, and then enter the pretreatment system, anaerobic system, aerobic system, and water outlet unit in turn, and then meet the discharge standards. Compared with the traditional water treatment process, the present invention adds a water inlet regulating unit, which includes a yeast pool and a regulating device. The yeast pool is connected to the pretreatment unit. The yeast pool includes yeast liquid. The regulating device can detect the COD value of the regulating pool and the yeast pool, and adjust the volume of the yeast liquid added to the pretreatment unit based on the detected COD value. By real-time monitoring of the COD value of the waste yeast liquid and the COD value of the wastewater in the regulating tank, the yeast liquid is mixed with the brewing wastewater in the pretreatment stage to achieve the compounding of the wastewater, thereby solving the problem of large fluctuations in the water quality of the wastewater inlet.

[0036] It should be noted that, in order to treat waste yeast, the present invention uses waste yeast liquid as yeast liquid. It is understandable that in another embodiment, yeast that has been fermented by beer but is still active can be used. In addition, since the organic matter in the waste yeast liquid can also help the anaerobic unit in the wastewater treatment system to produce more biogas, in another embodiment, organic matter can be added to the regulating system to increase the biogas production of the wastewater treatment system.

[0037] The regulating device includes a front-end COD online monitoring system, a metering pump and a first control system. The COD online detection system is used to detect the COD values ​​of the regulating tank and the yeast tank. The metering pump is connected to the waste yeast tank and the pretreatment unit. The first control system is connected to the COD online monitoring system and adjusts the frequency of the metering pump according to the COD value obtained by the detection, so that the waste yeast liquid is mixed with the brewing wastewater in the pretreatment section to achieve the compounding of the wastewater.

[0038] In order to facilitate the regulation of the COD value of the brewing wastewater inlet, the COD value in the yeast pool used is higher than the COD value of the wastewater in the regulating pool, so as to stabilize the COD value of the brewing wastewater inlet and reduce the fluctuation of the brewing wastewater inlet. The waste yeast liquid used in this embodiment often has a large COD value and can be directly used in the yeast pool. In another embodiment, if the COD value in the yeast pool is too small, industrial wastewater, organic matter and other substances can be added to the yeast pool to increase the COD value in the yeast pool.

[0039] The final water outlet unit is provided with a water outlet buffer tank, which has a water outlet and a water inlet, and the water outlet is higher than the water inlet, so that the water flow of the water outlet buffer tank is from bottom to top and overflows to the external drainage point. Since the general online monitoring system is tested every 2 hours, the volume of the water outlet buffer tank is calculated based on the amount of treated water that can be stored for 2 to 4 hours, which can leave enough buffer time for wastewater treatment.

[0040] A circulation unit is also provided in the water outlet unit, and the circulation unit includes a circulation pump and a circulation pipeline, and the circulation pipeline connects the water outlet unit and the regulating tank. The circulation pump system transports the wastewater in the water outlet unit to the regulating tank through the circulation pipeline to reprocess the overflowed wastewater. The flow rate of the circulation pump is 2 to 3 times the processing volume, which is equivalent to pumping the water in the water outlet buffer tank back to the regulating tank through the circulation pump, and no wastewater will be discharged during the pumping process.

[0041] The circulation unit also includes a second control system and a water outlet monitoring system. The second control system controls the operation of the circulation pump. The online monitoring system detects the wastewater index of the water outlet unit and compares it with the preset index. If any of the wastewater indexes of the water outlet unit is higher than the preset index, the second control system starts the circulation pump. The preset indexes include wastewater indexes including chemical oxygen demand, ammonia nitrogen, total nitrogen and total phosphorus. Taking the standard of water quality for sewage discharge into urban sewers (GB_T31962-2015) as an example, when any index data of online monitoring is greater than or equal to the preset index value for starting the circulation pump, the circulation pump is automatically started to pump the wastewater back to the regulating tank. The specific values ​​are shown in Table 1 below.

[0042] Table 1 Schematic diagram of preset indicators and water output indicators

[0043]

[0044] It can be understood that the above-mentioned indicator data are set according to the conventional indicators in wastewater, and the detection indicators in different wastewater can be adjusted, such as detecting the pH value and dissolved oxygen of the wastewater effluent.

[0045] Through the operation of the second control system and the effluent monitoring system, wastewater that is close to exceeding the standard can be pumped back in time, which can not only avoid the risk of effluent exceeding the standard due to wastewater fluctuations, but also dilute the pumped back wastewater with the raw water, thereby reducing the impact of wastewater fluctuations. Ultimately, it is ensured that the effluent always meets the standard stably.

[0046] The water outlet detection system is also connected to the alarm located in the central control room. When any of the wastewater indicators is higher than the preset indicator, the alarm will be activated to remind relevant staff to make timely adjustments.

[0047] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A wastewater treatment system, comprising a regulating tank, a pretreatment unit, a treatment unit and a water outlet unit connected in sequence, characterized in that: Also includes The water inlet regulating unit comprises a yeast pool and a regulating device, wherein the yeast pool is connected to the pretreatment unit, the yeast pool comprises yeast liquid, and the regulating device is capable of detecting COD values ​​of the regulating pool and the yeast pool, and adjusting the volume of the yeast liquid added to the pretreatment unit based on the detected COD value.

2. The wastewater treatment system according to claim 1, characterized in that: The regulating device includes a COD online monitoring system, a metering pump and a first control system. The COD online detection system is used to detect the COD values ​​of the regulating tank and the yeast tank. The metering pump is connected to the yeast tank and the pretreatment unit. The first control system is connected to the COD online monitoring system and adjusts the frequency of the metering pump according to the detected COD value.

3. The wastewater treatment system according to claim 1, characterized in that: The yeast pool includes spent yeast.

4. The wastewater treatment system according to claim 1, characterized in that: The COD value of the yeast liquid in the yeast pool is higher than the COD value of the wastewater in the regulating pool.

5. The wastewater treatment system according to claim 1, characterized in that: The water outlet unit comprises a water outlet buffer pool, wherein the water outlet buffer pool has a water outlet and a water inlet, wherein the water outlet is higher than the water inlet, so that the water outlet buffer pool is overflow water outlet.

6. The wastewater treatment system according to claim 1, characterized in that: The water outlet unit also includes a circulation unit, which includes a circulation pump and a circulation pipeline. The circulation pipeline connects the water outlet unit and the regulating tank. The circulation pump system transports the wastewater in the water outlet unit to the regulating tank through the circulation pipeline.

7. The wastewater treatment system according to claim 6, characterized in that: The flow rate of the circulation pipeline is 2 to 3 times the sewage treatment flow rate of the treatment unit.

8. The wastewater treatment system according to claim 6, characterized in that: The circulation unit also includes a second control system and a water outlet monitoring system. The second control system controls the operation of the circulation pump. The water outlet monitoring system detects the wastewater indicators of the water outlet unit and compares them with preset indicators. If any one of the wastewater indicators of the water outlet unit is higher than the preset indicator, the second control system starts the circulation pump.

9. The wastewater treatment system according to claim 8, characterized in that: The wastewater indicators include chemical oxygen demand, ammonia nitrogen, total nitrogen and total phosphorus.

10. The wastewater treatment system according to claim 8, characterized in that: The treatment unit includes an anaerobic unit and an aerobic unit.

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