Multistage resourceful treatment device suitable for fish meal production wastewater

Abstract

The utility model provides a multi-stage resourceful treatment device suitable for fish meal production wastewater. According to the technical scheme, the multi-stage resourceful treatment device comprises a heat exchange mechanism; a fish meal recovery mechanism; the fish meal recycling mechanism is connected with the heat exchange mechanism; a multi-stage anaerobic mechanism; the multi-stage anaerobic mechanism is connected with the heat exchange mechanism; a biogas collection mechanism; the biogas collecting mechanism is connected with the multi-stage anaerobic mechanism; an activated sludge mechanism; the activated sludge mechanism is connected with the multi-stage anaerobic mechanism; according to the method, various pollutants in the wastewater can be effectively removed, and protein components in the wastewater can be efficiently recycled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fish meal wastewater recovery, and particularly relates to a multi-stage resource treatment device suitable for fish meal production wastewater. BACKGROUND

[0002] Fish meal is often used in the fields of diet consumption, feed processing, aquaculture, etc. as a multi-purpose raw material. A large amount of wastewater is often generated in the production process of fish meal, and the wastewater contains a large amount of unused protein resources. The wastewater has characteristics such as high ammonia nitrogen, high organic matter and high turbidity. The protein in the wastewater not only has a large impact on subsequent sewage treatment, but also is a waste of resources. Therefore, it is necessary to efficiently recover and utilize the fish meal production wastewater. SUMMARY

[0003] In view of the deficiencies in the prior art, the embodiment of the present application provides a multi-stage resource treatment device suitable for fish meal production wastewater to solve the problems in the related art, and the technical scheme is as follows.

[0004] The embodiment of the present application provides a multi-stage resource treatment device suitable for fish meal production wastewater, which comprises: a heat exchange mechanism; a fish meal recovery mechanism; the fish meal recovery mechanism is connected with the heat exchange mechanism; a multi-stage anaerobic mechanism; the multi-stage anaerobic mechanism is connected with the heat exchange mechanism; a biogas collection mechanism; the biogas collection mechanism is connected with the multi-stage anaerobic mechanism; and an activated sludge mechanism; the activated sludge mechanism is connected with the multi-stage anaerobic mechanism.

[0005] In one embodiment, the heat exchange mechanism comprises: a heat exchanger; a cold water inlet, a cold water outlet, a hot water inlet and a hot water outlet are arranged on the heat exchanger; the cold water inlet is connected with an upstream fish meal production wastewater end; the cold water outlet and the hot water inlet are both connected with the fish meal recovery mechanism; and the hot water outlet is connected with the multi-stage anaerobic mechanism.

[0006] In one embodiment, the fish meal recovery mechanism comprises: a heating treatment area, a flotation treatment area and a heat pump drying treatment area; an input end of the heating treatment area is connected with the heat exchanger, and an output end of the heating treatment area is connected with the flotation treatment area; a first output end of the flotation treatment area is connected with the heat exchanger, and a second output end of the flotation treatment area is connected with the heat pump drying treatment area.

[0007] In one embodiment, the fish meal recovery mechanism further comprises: a heat source treatment area; one end of the heat source treatment area is connected with the heating treatment area, and the other end of the heat source treatment area is connected with the heat pump drying treatment area.

[0008] In an embodiment, the multi-stage anaerobic mechanism comprises: a first anaerobic fermentation zone and a second anaerobic fermentation zone; the first anaerobic fermentation zone and the second anaerobic fermentation zone are both connected to the biogas collection mechanism; one end of the first anaerobic fermentation zone is connected to the hot water outlet, and the other end of the first anaerobic fermentation zone is connected to the second anaerobic fermentation zone; the second anaerobic fermentation zone is connected to the activated sludge mechanism.

[0009] In an embodiment, a first three-phase separator and a first gas-liquid separator are arranged on the first anaerobic fermentation zone; the first gas-liquid separator is connected to the biogas collection mechanism.

[0010] In an embodiment, a sludge bed, a second three-phase separator, and a second gas-liquid separator are arranged in the second anaerobic fermentation zone; the second gas-liquid separator is connected to the biogas collection mechanism.

[0011] In an embodiment, the biogas collection mechanism comprises: a biogas purification treatment zone and a steam boiler treatment zone; one end of the biogas purification treatment zone is connected to the first gas-liquid separator and the second gas-liquid separator respectively, and the other end of the biogas purification treatment zone is connected to the steam boiler treatment zone.

[0012] In an embodiment, the activated sludge mechanism comprises: a multi-stage processor and a sedimentation tank; one end of the multi-stage processor is connected to the second anaerobic fermentation zone, and the other end of the multi-stage processor is connected to the sedimentation tank.

[0013] In an embodiment, an anaerobic treatment zone, an anoxic treatment zone, and an aerobic treatment zone are arranged in the multi-stage processor in sequence horizontally; an aeration zone is arranged in the aerobic treatment zone; the anaerobic treatment zone is connected to the second anaerobic fermentation zone; the aerobic treatment zone is connected to the sedimentation tank.

[0014] The above technical solution has at least the following advantages or beneficial effects:

[0015] The multi-stage resource processing device of the present application is used for processing wastewater generated in the production process of fish meal. After the wastewater flows into the heat exchange mechanism, a first part flows to the fish meal recovery mechanism, which can use the wastewater to produce dry fish meal, and a second part flows through the biogas collection mechanism and the activated sludge mechanism after flowing through the multi-stage anaerobic mechanism. The biogas collected by the biogas collection mechanism can be used for resource utilization to provide energy for the boiler in the factory area, and the activated sludge mechanism further removes pollutants in the water through biochemical action to meet the wastewater discharge standard.

[0016] The above summary is intended to illustrate, but not limit, the present application. Further aspects, embodiments and features of the present application will be readily apparent from the detailed description and drawings below. BRIEF DESCRIPTION OF DRAWINGS

[0017] In the drawings, like reference numerals refer to same or similar components throughout the several views. The drawings are not necessarily to scale. It should be understood that the drawings only depict some embodiments of the present application and do not imply any limitation of scope of the present application.

[0018] Fig. 1 is the overall module connection schematic diagram of the utility model;

[0019] Fig. 2 is the first decomposition module connection schematic diagram of the utility model;

[0020] Fig. 3 is the second decomposition module connection schematic diagram of the utility model.

[0021] In the drawings: 1, heat exchange mechanism; 11, heat exchanger; 12, cold water inlet; 13, cold water outlet; 14, hot water inlet; 15, hot water outlet;

[0022] 2, fish meal recovery mechanism; 21, heating treatment area; 22, air floatation treatment area; 23, heat pump drying treatment area; 24, heat source treatment area;

[0023] 3, multi-stage anaerobic mechanism; 31, first anaerobic fermentation area; 32, second anaerobic fermentation area;

[0024] 4, biogas collection mechanism; 41, biogas purification treatment area; 42, steam boiler treatment area;

[0025] 5, activated sludge mechanism; 51, multi-stage processor; 52, sedimentation tank;

[0026] 61, first three-phase separator; 62, first gas-liquid separator;

[0027] 71, sludge bed; 72, second three-phase separator; 73, second gas-liquid separator;

[0028] 81, anaerobic treatment area; 82, anoxic treatment area; 83, aerobic treatment area; 84, aeration area. DETAILED DESCRIPTION

[0029] Hereinafter, in order to make the purpose, features and advantages of the present application more obvious and easy to understand, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0030] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0031] As Figs. 1 to 3 shown, the present application provides a multi-stage resource treatment device suitable for fish meal production wastewater, comprising: a heat exchange mechanism 1; a fish meal recovery mechanism 2; the fish meal recovery mechanism 2 is connected to the heat exchange mechanism 1; a multi-stage anaerobic mechanism 3; the multi-stage anaerobic mechanism 3 is connected to the heat exchange mechanism 1; a biogas collection mechanism 4; the biogas collection mechanism 4 is connected to the multi-stage anaerobic mechanism 3; an activated sludge mechanism 5; the activated sludge mechanism 5 is connected to the multi-stage anaerobic mechanism 3.

[0032] In the present embodiment, the two ends of the heat exchange mechanism 1 are respectively connected to the fish meal recovery mechanism 2 and the multi-stage anaerobic mechanism 3. The upstream fish meal production wastewater is first introduced into the heat exchange mechanism 1 for preliminary heating, and then transported into the fish meal recovery mechanism 2 through a pipeline. The fish meal recovery mechanism 2 dries and purifies the wastewater to achieve the effect of recovering fish meal.

[0033] The wastewater in the fish meal recovery mechanism 2 flows back to the heat exchange mechanism 1 and then flows into the multi-stage anaerobic mechanism 3 after cooling. The multi-stage anaerobic mechanism 3 is connected to the biogas collection device 4, which can utilize the recovered biogas as a resource and provide energy for the boiler in the factory area. The water outlet of the biogas collection device 4 flows into the activated sludge mechanism 5, which is treated to meet the discharge standard. The main mechanisms of the treatment device of the present application are all at least two groups or more, which ensures that the system can work normally in the case of possible production stoppage for repair.

[0034] Further, the heat exchange mechanism 1 comprises: a heat exchanger 11; a cold water inlet 12, a cold water outlet 13, a hot water inlet 14 and a hot water outlet 15 are arranged on the heat exchanger 11; the cold water inlet 12 is connected to the upstream fish meal production wastewater; the cold water outlet 13 and the hot water inlet 14 are both connected to the fish meal recovery mechanism 2; and the hot water outlet 15 is connected to the multi-stage anaerobic mechanism 3.

[0035] In the present embodiment, the heat exchanger 11 adopts a relatively large aperture heat exchanger to prevent clogging due to fish meal precipitation; the heat exchanger 11 is provided with four ports, namely a cold water inlet 12, a cold water outlet 13, a hot water inlet 14 and a hot water outlet 15, wherein: the cold water inlet 12 is connected to the upstream fish meal production process wastewater end (due to the front-end production process requirements, the wastewater remains in a low temperature state), the heat exchanger 11 preliminarily heats the above-mentioned wastewater, and the heated wastewater is output from the cold water outlet 13 to the fish meal recovery mechanism 2; the hot water inlet 14 is also connected to the fish meal recovery mechanism 2, and the high-temperature air floatation water generated by the fish meal recovery mechanism 2 process is flowed into the heat exchanger 11 from the hot water inlet 14, and exchanges heat with the initial wastewater to achieve heating effect and improve resource utilization efficiency; the hot water outlet 15 is connected to the multi-stage anaerobic mechanism 3, and the hot water outlet 15 can output the final cooling water to the multi-stage anaerobic mechanism 3 for downstream wastewater treatment.

[0036] Further, the fish meal recovery mechanism 2 comprises: a heating treatment area 21, an air floatation treatment area 22 and a heat pump drying treatment area 23; the input end of the heating treatment area 21 is connected to the heat exchanger 11, and the output end of the heating treatment area 21 is connected to the air floatation treatment area 22; the first output end of the air floatation treatment area 22 is connected to the heat exchanger 11, and the second output end of the air floatation treatment area 22 is connected to the heat pump drying treatment area 23.

[0037] In the present embodiment, the air floatation treatment area 22 has a first output end and a second output end, wherein the first output end is connected to the heat exchanger 11, and the second output end is connected to the heat pump drying treatment area 23; the wastewater generated by the fish meal production process has a relatively low temperature, and the wastewater first enters the heat exchanger 11 to exchange heat with the water outlet of the air floatation treatment area 22, the low-temperature wastewater after the heat exchanger 11 is preliminarily heated and flowed into the heating treatment area 21, and the air floatation water in the heat exchanger 11 is reduced in temperature and becomes the final water outlet and flowed to the downstream wastewater treatment end; the wastewater in the heating treatment area 21 is non-contact heated and reaches a set temperature and then flowed into the air floatation treatment area 22, the fish meal collected by the air floatation treatment area 22 has a high water content, and the water-containing fish meal enters the heat pump drying treatment area 23 for water removal and drying purification to achieve the effect of recovering fish meal;

[0038] In one implementation condition, the front-end low-temperature wastewater is maintained at 0-20℃, the temperature is raised to 30-40℃ by the heat exchanger 11, the wastewater is transported by pipeline into the heating treatment area 21, non-contact heating is adopted by using steam heat source to heat the wastewater to 55-65℃, the inside of the heating treatment area 21 is continuously stirred, the wastewater is transported into the air floatation treatment area 22, the water-containing fish meal is separated out by the air floatation treatment area 22 and discharged from the residue discharge section, the separated fish meal has a water content of 80-90%, and then the water outlet is cooled by the heat exchanger 11 again, the temperature is reduced to 30-35℃, and the water outlet is connected to the subsequent multi-stage anaerobic mechanism 3 biochemical treatment process;

[0039] In the fish meal recovery wastewater treatment process described above, no chemicals need to be added, the heat source utilizes the residual heat energy from the factory process and the waste condensate water, thereby reducing the treatment cost, improving the resource utilization efficiency, and also improving the availability of the recovered fish meal.

[0040] Further, the fish meal recovery mechanism 2 further comprises a heat source treatment area 24, one end of the heat source treatment area 24 is connected to the heating treatment area 21, and the other end of the heat source treatment area 24 is connected to the heat pump drying treatment area 23.

[0041] In this embodiment, the heat source of the heat source treatment area 24 is the residual heat energy from the factory process and the waste condensate water from the factory, and the two ends of the heat source treatment area 24 are connected to the heating treatment area 21 and the heat pump drying treatment area 23, respectively. The residual heat energy (condensate water or steam) output from the heat source treatment area 24 is connected to the heating treatment area 21, which can non-contact heat the wastewater in the heating treatment area 21, so that the wastewater is continuously heated to a set temperature and becomes completely heated wastewater. The residual heat energy (condensate water or steam) output from the heat source mechanism 6 is connected to the heat pump drying treatment area 23, and in the evaporator unit, the low-temperature and low-pressure refrigerant absorbs heat energy to evaporate into gas. The gas is further pressurized and heated by the compressor, and then the normal-temperature air is heated to high-temperature air in the condenser, thereby forming a high-temperature gas condition in the hot air drying area.

[0042] Further, the multi-stage anaerobic mechanism 3 comprises a first anaerobic fermentation area 31 and a second anaerobic fermentation area 32, the first anaerobic fermentation area 31 and the second anaerobic fermentation area 32 are both connected to the biogas collection mechanism 4, one end of the first anaerobic fermentation area 31 is connected to the hot water outlet 15, the other end of the first anaerobic fermentation area 31 is connected to the second anaerobic fermentation area 32, and the second anaerobic fermentation area 32 is connected to the activated sludge mechanism 5. A first three-phase separator 61 and a first gas-liquid separator 62 are arranged on the first anaerobic fermentation area 31, and the first gas-liquid separator 62 is connected to the biogas collection mechanism 4. A sludge bed 71, a second three-phase separator 72, and a second gas-liquid separator 73 are arranged in the second anaerobic fermentation area 32, and the second gas-liquid separator 73 is connected to the biogas collection mechanism 4.

[0043] In this embodiment, the first anaerobic fermentation area 31 and the second anaerobic fermentation area 32 are both anaerobic reactors, the multi-stage anaerobic mechanism 3 at least comprises the first anaerobic fermentation area 31 and the second anaerobic fermentation area 32, the multi-stage anaerobic mechanism 3 is composed of multiple groups of anaerobic fermentation biogas production devices, each group of anaerobic fermentation biogas production device comprises a three-phase separator and a gas-liquid separator, the top of the first anaerobic fermentation area 31 is connected to the bottom of the second anaerobic fermentation area 32 (see Fig. 3), the front end effluent enters the anaerobic reactor in the form of bottom influent, forming a sludge bed 71, a three-phase separator is arranged at the upper part of the sludge bed 71, which can prevent sludge loss; a gas-liquid separator is arranged at the top of the anaerobic reactor, which is used for separating biogas produced by anaerobic fermentation; the first gas-liquid separator 62 and the second gas-liquid separator 73 are both connected to the biogas collection mechanism 4, which can collect and transmit the biogas produced by the above-mentioned anaerobic reactor into the biogas collection mechanism 4;

[0044] In addition, the system effluent in the multi-stage anaerobic mechanism 3 adopts a three-phase separator form, which can prevent the influence of methane gas on the anaerobic effluent; a reflux device is also arranged in the first anaerobic fermentation zone 31 and the second anaerobic fermentation zone 32, which can improve the treatment efficiency of the anaerobic reactor.

[0045] Further, the biogas collection mechanism 4 comprises a biogas purification treatment zone 41 and a steam boiler treatment zone 42; one end of the biogas purification treatment zone 41 is respectively connected to the first gas-liquid separator 62 and the second gas-liquid separator 73, and the other end of the biogas purification treatment zone 41 is connected to the steam boiler treatment zone 42.

[0046] In this embodiment, the biogas purification treatment zone 41 and the steam boiler treatment zone 42 in the biogas collection mechanism 4 are connected in sequence, and the function of the biogas collection mechanism 4 is to purify the biogas produced by the anaerobic reactor, and then deliver the purified biogas to the steam boiler device (i.e. the boiler treatment zone 42) in the factory area and provide energy for it, so as to produce steam for production in the factory area.

[0047] Further, the activated sludge mechanism 5 comprises a multi-stage processor 51 and a sedimentation tank 52; one end of the multi-stage processor 51 is connected to the second anaerobic fermentation zone 32, and the other end of the multi-stage processor 51 is connected to the sedimentation tank 52. An anaerobic treatment zone 81, an anoxic treatment zone 82, and an aerobic treatment zone 83 are arranged in the multi-stage processor 51 in sequence and horizontally; an aeration zone 84 is arranged in the aerobic treatment zone 83; the anaerobic treatment zone 81 is connected to the second anaerobic fermentation zone 32; and the aerobic treatment zone 83 is connected to the sedimentation tank 52.

[0048] In this embodiment, the input end of the multi-stage processor 51 is connected to the second anaerobic fermentation zone 32, and the input end is connected to the sedimentation tank 52, and the multi-stage processor 51 and the sedimentation tank 52 together constitute an activated sludge treatment system; the anaerobic treatment zone 81, the anoxic treatment zone 82, and the aerobic treatment zone 83 are arranged in the multi-stage processor 51 in sequence and horizontally, the effluent of the second anaerobic fermentation zone 32 passes through the multi-stage processor 51, the residual proteins, amino acids and other organic matters in the wastewater can be fully hydrolyzed into small molecular substances, and the biogas production can be controlled by regulating the distribution of multi-stage anaerobic populations;

[0049] An aeration zone 84 (aeration device) is arranged in the aerobic treatment zone 83, and the aeration zone 84 is used for controlling hydrogen sulfide gas generated due to reduction of sulfur-containing substances in the wastewater, wherein the sequencing batch reactor adopts a circulating aeration mode for enhanced denitrification; in addition, the traditional activated sludge treatment method in the activated sludge mechanism 5 includes but is not limited to the AO method, the AAO method and the SBR method (all of which are common technical means of the person skilled in the related art, and will not be described here) and the like, and the selection of the treatment method can be determined according to the requirements of the plant site and the effluent, and the system is more flexible and convenient to use.

[0050] The multi-stage resource treatment device suitable for fish meal production wastewater can effectively remove various pollutants in wastewater and efficiently recycle protein components in wastewater.

[0051] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features.

[0052] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "above", "upper" and "upper surface" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions are only for the purpose of description, and are not indicative or suggestive of the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0053] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various changes or replacements within the technical range disclosed by the present application, and these should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-stage resourceful treatment device suitable for fish meal production wastewater, characterized in that, The system comprises: a heat exchange mechanism; a fish meal recovery mechanism connected to the heat exchange mechanism; a multi-stage anaerobic mechanism; the multi-stage anaerobic mechanism connected to the heat exchange mechanism; a biogas collection mechanism connected to the multi-stage anaerobic mechanism; an activated sludge mechanism connected to the multi-stage anaerobic mechanism.

2. The multi-stage resource recovery treatment device for fish meal production wastewater according to claim 1, characterized by, The heat exchange mechanism comprises a heat exchanger, a cold water inlet, a cold water outlet, a hot water inlet and a hot water outlet arranged on the heat exchanger; the cold water inlet is connected to an upstream fish meal production wastewater end; the cold water outlet and the hot water inlet are both connected to the fish meal recovery mechanism; and the hot water outlet is connected to the multi-stage anaerobic mechanism.

3. The multi-stage resource recovery treatment device for fish meal production wastewater according to claim 2, characterized by, The fish meal recovery mechanism comprises a heating treatment area, a flotation treatment area and a heat pump drying treatment area; the input end of the heating treatment area is connected to the heat exchanger, and the output end of the heating treatment area is connected to the flotation treatment area; the first output end of the flotation treatment area is connected to the heat exchanger, and the second output end of the flotation treatment area is connected to the heat pump drying treatment area.

4. The multi-stage resource recovery treatment device for fish meal production wastewater according to claim 3, characterized by, The fish meal recovery mechanism further comprises a heat source treatment area; one end of the heat source treatment area is connected to the heating treatment area, and the other end of the heat source treatment area is connected to the heat pump drying treatment area.

5. The multi-stage resource recovery treatment device for fish meal production wastewater according to any one of claims 2-4, characterized in that, The multi-stage anaerobic mechanism comprises a first anaerobic fermentation area and a second anaerobic fermentation area; both the first anaerobic fermentation area and the second anaerobic fermentation area are connected to the biogas collection mechanism; one end of the first anaerobic fermentation area is connected to the hot water outlet, and the other end of the first anaerobic fermentation area is connected to the second anaerobic fermentation area; and the second anaerobic fermentation area is connected to the activated sludge mechanism.

6. The multi-stage resource recovery treatment device for fish meal production wastewater according to claim 5, characterized by, A first three-phase separator and a first gas-liquid separator are arranged on the first anaerobic fermentation area; and the first gas-liquid separator is connected to the biogas collection mechanism.

7. The multi-stage resource recovery treatment device for fish meal production wastewater according to claim 6, characterized by, A sludge bed, a second three-phase separator and a second gas-liquid separator are arranged in the second anaerobic fermentation area; and the second gas-liquid separator is connected to the biogas collection mechanism.

8. The multi-stage resource recovery treatment device for fish meal production wastewater according to claim 7, characterized by, The biogas collection mechanism comprises a biogas purification treatment area and a steam boiler treatment area; one end of the biogas purification treatment area is connected to the first gas-liquid separator and the second gas-liquid separator respectively, and the other end of the biogas purification treatment area is connected to the steam boiler treatment area.

9. The multi-stage resource recovery treatment device for fish meal production wastewater according to claim 5, characterized by, The activated sludge mechanism comprises a multi-stage processor and a sedimentation tank; one end of the multi-stage processor is connected to the second anaerobic fermentation area, and the other end of the multi-stage processor is connected to the sedimentation tank.

10. The multi-stage resource recovery treatment device for fish meal production wastewater according to claim 9, characterized by, An anaerobic treatment area, an anoxic treatment area and an aerobic treatment area are arranged in the multi-stage processor in sequence horizontally; an aeration area is arranged in the aerobic treatment area; the anaerobic treatment area is connected to the second anaerobic fermentation area; and the aerobic treatment area is connected to the sedimentation tank.

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