A mixed liquid treatment and recycling device and method for rural water-flushing toilets

Abstract

The present application discloses a mixed liquor treatment and reuse device and method for rural flush toilets, in order to solve the problems of the existing technology, such as the difficulty of sewage treatment, high treatment cost, incomplete treatment and difficulty in reusing feces as fertilizer. The present application comprises: a tank body, the left and right ends of the upper part of the tank body are respectively provided with a mixed liquor inlet and a mature feces outlet, the interior of the tank body is provided with an inclined filter screen, the inner part of the tank body is divided into an anaerobic tank and an anoxic-aerobic tank, the anoxic-aerobic tank is provided with an aeration pipe, and the lower part of the anoxic-aerobic tank is provided with a water outlet; the present application separates solid feces and sewage through a filter screen, and has a lower operating cost compared with the existing rural flush toilet sewage treatment method; the mature solid feces after aerobic fermentation treatment can be used as farmyard manure for farmland application; after the sewage is treated by anaerobic-anoxic-aerobic treatment, the effluent water quality can be reused as farmland irrigation water, the method has good treatment effect, simple operation and maintenance, and high promotion.

Description

Technical Field

[0001] The present application relates to the field of environmental protection, and in particular to a device and method for treating and recycling mixed liquid in rural water-flushing toilets. Background Art

[0002] Dry toilets are a common method used in rural areas. In order to solve the serious environmental and health problems caused by dry toilets, such as odor, dirtiness, and mosquito and fly breeding, many rural areas have transformed dry toilets into water-flushed toilets. After the transformation, there is no odor, cleanliness, and few mosquitoes and flies, and the environmental sanitation has been greatly improved. However, water-flushed toilets produce a larger amount of sewage, and feces enter the sewage to make it more concentrated, which greatly increases the difficulty of treatment, which limits the promotion and use of water-flushed toilets in rural areas.

[0003] At present, there are three main ways to treat rural flush toilet sewage: (1) collect it in containers and then regularly extract and transport it to other places for treatment. This method does not treat the sewage, but simply collects and transports it, which has high transportation costs; (2) anaerobic treatment in septic tanks can reduce the concentration of some organic matter. This method has low treatment costs, but the treatment is not thorough and cannot be discharged directly, requiring further treatment; (3) After collecting it through a pipeline network, it is treated in a traditional sewage treatment station and then discharged in compliance with the standards. This method can treat sewage well, but the pipeline network and centralized treatment facilities are expensive and have high operating costs, making it difficult to promote in most rural areas. In addition, the above-mentioned flush toilet sewage treatment methods do not recycle feces as fertilizer for farmland use, resulting in a large waste of resources. Summary of the invention

[0004] To this end, the present application provides a rural water-flushing toilet mixed liquor treatment and reuse device and method to solve the problems of the prior art such as difficulty in sewage treatment, high treatment cost, incomplete treatment and difficulty in reusing feces as fertilizer.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, a mixed liquor treatment and recycling device for rural flush toilets includes a tank body;

[0007] The left and right ends of the upper part of the tank body are respectively provided with a mixed liquid inlet and a decomposed feces outlet, and the mixed liquid inlet is located above the decomposed feces outlet; an inclined filter screen is provided inside the tank body, and the filter screen is located below the mixed liquid inlet and the decomposed feces outlet, and is inclined along the discharge direction of solid feces;

[0008] A partition is arranged longitudinally inside the tank body, and the partition divides the inside of the tank body into an anaerobic tank on the left and an anoxic-aerobic tank on the right. An aeration pipe is arranged inside the anoxic-aerobic tank, and a water outlet is opened at the bottom of the anoxic-aerobic tank.

[0009] Optionally, the mixed liquor inlet is located at one end of the top of the pool body, and the decomposed feces outlet is located at the upper part of the other side of the pool body.

[0010] Optionally, the filter is made of nylon mesh with a mesh size of 400-800 and a slope of 2-5%.

[0011] Optionally, a support plate is provided at the bottom of the filter screen, and a plurality of through holes are formed on the support plate, and the plurality of through holes are used for passing sewage.

[0012] Optionally, the support plate is made of PVC; the diameter of the through hole is 0.5-1.5 cm.

[0013] Optionally, a valve is provided at the outlet of the decomposed feces.

[0014] Optionally, an air outlet is provided on the top of the pool body and on one side of the anoxic-aerobic pool.

[0015] Optionally, the aeration pipe is a perforated aeration pipe, and there are multiple perforated aeration pipes, and the multiple perforated aeration pipes are arranged side by side and at intervals at the bottom of the anoxic-aerobic tank.

[0016] Optionally, a dynamic membrane component is further included, and the dynamic membrane component is arranged in the anoxic-aerobic pool and close to the water outlet.

[0017] In a second aspect, a method for treating and reusing a mixed liquid in a rural flush toilet is provided, using the above-mentioned device for treating and reusing a mixed liquid in a rural flush toilet, and comprising the following steps:

[0018] Step 1: After the solid-liquid mixture of feces and sewage enters the tank body from the mixed liquid inlet, the solid-liquid mixture is first filtered using a filter screen, so that the separated sewage falls into the lower part of the anaerobic tank under the action of gravity, and the retained solid feces slides directly from the upper part of the anaerobic tank to the upper part of the anoxic-aerobic tank along the filter screen;

[0019] Step 2: After the solid feces slide directly from the upper part of the anaerobic tank into the upper part of the anoxic-aerobic tank; after staying in the anoxic-aerobic tank for a set time, the matured feces fertilizer is obtained through aerobic fermentation and discharged from the mature feces outlet for farmland utilization;

[0020] At the same time, after the sewage undergoes anaerobically fermentation in the anaerobic tank for a set residence time, it enters the anoxic-aerobic tank; intermittent aeration is performed using aeration pipes to put the sewage in an anoxic-aerobic cycle, and then it is discharged from the outlet for reuse.

[0021] Compared with the prior art, this application has at least the following beneficial effects:

[0022] 1. The present application provides a rural water-flushing toilet mixed liquor treatment and reuse device and method thereof, comprising a tank body, wherein the left and right ends of the upper part of the tank body are respectively provided with a mixed liquor inlet and a mature feces outlet, and the interior of the tank body is provided with an inclined filter screen, and the interior of the tank body is divided into an anaerobic tank and an anoxic-aerobic tank, wherein an aeration pipe is provided inside the anoxic-aerobic tank, and a water outlet is provided at the lower part of the anoxic-aerobic tank; when in use, after the solid-liquid mixed liquor of water-flushing toilet feces and sewage enters the interior of the tank body from the mixed liquor inlet, the solid feces and sewage are separated through the filter screen; the present application has a simple structure, is convenient and practical, and has low operation and treatment costs compared with the existing rural toilet sewage treatment method; aerobic fermentation The treated decomposed solid feces can be used as farmyard manure for farmland application. After most of the solid feces in the sewage are separated, the concentration of pollutants in the sewage can be greatly reduced. After anaerobic-anoxic-aerobic treatment, COD, ammonia nitrogen and TN in the flushing water can be removed. The water quality of the effluent meets the standards and can be reused as farmland irrigation water. This method, as a comprehensive treatment method for mixed liquor in rural water-flushing toilets, basically solves the problems of existing rural water-flushing toilet sewage treatment technology, such as high treatment difficulty, high treatment cost, and difficulty in reusing feces as fertilizer. It has good treatment effect, low one-time investment and operating cost, simple operation and maintenance, and has good promotion and application value in rural toilet renovation.

[0023] 2. The present application uses a filter to separate solid feces and sewage in the mixed liquor of a flush toilet, thereby recycling the solid feces as farmyard manure and reducing the pollutant load of sewage in the mixed liquor of the flush toilet, thereby providing good conditions for the subsequent sewage treatment effect.

[0024] 3. The solid feces of the present application utilizes the air dissipated from the sewage in the lower anoxic-aerobic tank for aerobic fermentation and decomposition, organically combining sewage and solid treatment, saving the aeration cost of solid aerobic fermentation; at the same time, compared with anaerobic fermentation, solid aerobic fermentation has good fermentation effect, short processing time, and saves equipment floor space and one-time construction investment.

[0025] 4. The rural flush toilet mixed liquor treatment and reuse method of the present application has low energy consumption and operating costs; solid feces are fermented using the residual gas from sewage treatment; at the same time, sewage treatment utilizes intermittent aeration and uses gravity water discharge from dynamic membrane components. Except for intermittent aeration, no additional air supply is required, which greatly reduces the power operating cost of the method. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more intuitively illustrate the prior art and the present application, several exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, those skilled in the art are capable of easily making conventional adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components) based on the technical concepts and exemplary drawings disclosed in the present application.

[0027] Figure 1 A schematic diagram of the structure provided for one embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1. Mixed liquid inlet; 2. Filter; 3. Support plate; 4. Tank body; 5. Partition; 6. Air outlet; 7. Valve; 8. Decomposed feces outlet; 9. Water outlet; 10. Dynamic membrane assembly; 11. Aeration pipe; 12. Anaerobic tank; 13. Anoxic-aerobic tank. DETAILED DESCRIPTION

[0030] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0031] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0032] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

[0033] One embodiment of the present application is a mixed liquid treatment and recycling device for rural water flush toilets, such as Figure 1 As shown, it includes a tank body 4; a mixed liquid inlet 1 and a decomposed feces outlet 8 are respectively provided at the left and right ends of the upper part of the tank body 4, and the mixed liquid inlet 1 is located above the decomposed feces outlet 8; an inclined filter screen 2 is provided inside the tank body 4, and the filter screen 2 is located below the mixed liquid inlet 1 and the decomposed feces outlet 8, and is inclined along the discharge direction of solid feces;

[0034] A partition 5 is longitudinally arranged inside the tank body 4, and the partition 5 divides the inside of the tank body 4 into an anaerobic tank 12 on the left and an anoxic-aerobic tank 13 on the right. An aeration pipe 11 is arranged inside the anoxic-aerobic tank 13, and a water outlet 9 is provided at the lower part of the anoxic-aerobic tank 13; an opening for solid feces and sewage to pass through is provided in the middle of the partition 5.

[0035] The anoxic-aerobic tank 13 is also called an intermittent aeration tank. Through intermittent aeration, the sewage in the anoxic-aerobic tank 13 is in an anoxic-aerobic cycle.

[0036] Preferably, the mixed liquor inlet 1 is located at one end of the top of the tank body 4 , and the decomposed feces outlet 8 is located at the upper part of the other side of the tank body 4 .

[0037] Preferably, the filter screen 2 is made of nylon mesh with a mesh size of 400-800 and a slope of 2-5%.

[0038] Further preferably, a support plate 3 is provided at the bottom of the filter screen 2, and a plurality of through holes are opened on the support plate 3, and the plurality of through holes are used for passing sewage.

[0039] Still more preferably, the support plate 3 is made of PVC material; the diameter of the through hole is 0.5-1.5 cm.

[0040] Preferably, a valve 7 is provided at the mature feces outlet 8 to control the residence time of the solid feces in the anoxic-aerobic tank 13 , that is, to control the discharge of the solid feces matured in the anoxic-aerobic tank 13 .

[0041] In this embodiment, the valve 7 is equivalent to a baffle, which can be plugged into the tank body 4, and its operating ends are exposed outside the tank body 4. When solid feces need to be discharged, the valve 7 can be pulled out.

[0042] Sewage treatment is continuous, and the retention time refers to the hydraulic retention time, which is controlled by the volume of the anaerobic tank 12 and the anoxic-aerobic tank 13. The flow rate divided by the effective volume of the tank is the retention time; the discharge of solid feces is intermittent and discontinuous. After being separated from the sewage in the upper part of the anaerobic tank 12, the solid feces directly enters the upper part of the anoxic-aerobic tank 13 for aerobic fermentation and decomposition. The fermentation treatment time of the solid feces is controlled by controlling the time of opening the valve 7, and the solid retention time is controlled to be 10-30d.

[0043] Preferably, an air outlet 6 is provided on the top of the tank body 4, and the air outlet 6 is located at one side of the anoxic-aerobic tank 13 so as to discharge the remaining air introduced through the aeration pipe.

[0044] Preferably, the aeration pipe 11 is a perforated aeration pipe 11 , and there are multiple perforated aeration pipes 11 , which are arranged side by side and at intervals at the bottom of the anoxic-aerobic tank 13 .

[0045] Further preferably, the aperture of the perforated aeration tube 11 is 1-5 mm.

[0046] Preferably, a dynamic membrane assembly 10 is also included, which is arranged in the anoxic-aerobic pool 13 and close to the water outlet 9. The dynamic membrane backwashing time is 40-60 days / time, and the effluent from the anoxic-aerobic pool is used as the backwashing water source.

[0047] Further preferably, the dynamic membrane assembly 10 uses a nylon mesh or a steel mesh with a mesh size of 200-500 meshes; and a layer of activated sludge is covered on the nylon mesh or the steel mesh, so that water can pass through but sludge cannot pass through, thereby achieving a separation effect. Compared with traditional membrane reactors, the dynamic membrane assembly does not require a pump to provide water outlet pressure, and the dynamic membrane discharges water by gravity, which has the advantages of large filtration flux, low cost and convenient backwashing.

[0048] A method for treating and reusing a mixed liquid in a rural flush toilet, using the above-mentioned device for treating and reusing a mixed liquid in a rural flush toilet, comprises the following steps:

[0049] Step 1: After the solid-liquid mixture of feces and sewage enters the tank body 4 from the mixed liquid inlet 1, the solid-liquid mixture is first filtered using the filter screen 2, so that the trapped solid feces slides down from the upper part of the anaerobic tank 12 to the upper part of the anoxic-aerobic tank 13 along the filter screen 2 under the action of gravity;

[0050] Step 2: After the solid feces is separated from the sewage by filtration in the anaerobic tank 12, it enters the anoxic-aerobic tank 13; after staying in the anoxic-aerobic tank 13 for a set time, it is aerobically composted and decomposed in the solid aerobic fermentation part, thereby producing mature solid feces. The decomposed solid feces meets the requirements of the "Technical Specifications for Returning Livestock and Poultry Manure to Farmland" (GB / T 25246-2010), and then discharged from the decomposed feces outlet 8, which can be used as farmyard manure for farmland utilization; wherein, the filtered solid feces is aerobically fermented and decomposed in the anoxic-aerobic tank 13, and the solid residence time is 10-30 days;

[0051] The separated sewage falls into the lower part of the anaerobic tank 12 under the action of gravity, and undergoes anaerobic fermentation in the anaerobic tank 12 with a residence time of 0.5-3d; then it enters the intermittent aeration tank and is intermittently aerated using the aeration pipe 11 for 3-6min, and then the aeration is stopped for 20-30min. The air introduced into the aeration pipe 11 aerobically ferments the solid feces and puts the sewage in an anoxic-aerobic cycle, thereby removing COD, ammonia nitrogen and total nitrogen in the sewage. The treated sewage passes through the dynamic membrane assembly 10 and is discharged under the action of gravity. The water quality meets the "Agricultural Irrigation Water Quality Standard" (GB5084-2021), and then is discharged from the outlet 9 and can be directly reused as irrigation water.

[0052] In this embodiment, the sewage is discharged by gravity throughout the process, and the effluent is also discharged by gravity through a dynamic membrane assembly. The solid feces is moved by gravity by setting a slope. Except for intermittent aeration energy consumption, the rest of the entire treatment process is zero energy consumption, which greatly reduces the operating cost of the entire treatment method.

[0053] After the rural flush toilet mixed liquid treatment and recycling device provided by the present application, the filter screen 2 is used to separate the solid feces and liquid in the solid-liquid mixed liquid of flush toilet feces and sewage (flushed toilet mixed liquid), so as to not only recycle the solid feces as farmyard manure, but also reduce the pollutant load of sewage in the flush toilet mixed liquid, thereby providing good conditions for the subsequent sewage treatment effect. Application examples are as follows:

[0054] Embodiment 1:

[0055] The water from a flush toilet for single men living alone in a rural area of ​​Pingyao County has the following properties: pH 7.46, COD 510.62 mg / L, TN 97.24 mg / L, NH4 + -N is 47.65mg / L, TP is 20.66mg / L, and SS is 168.56mg / L. Take 8L of the solid-liquid mixture of water-flushing toilet feces and sewage and add it to the rural water-flushing toilet mixed liquid treatment and reuse device provided in this application, filter the solid-liquid mixture using the filter screen 2, and make the solid feces flow to the upper part of the anoxic-aerobic tank 13 along the filter screen 2 by gravity. After the solid feces are aerobically fermented and decomposed for 25 days, 300g of matured feces fertilizer is obtained. The analysis shows that the arsenic content in the decomposed fertilizer is 6mg / kg dry solid, the copper content is 52mg / kg dry solid, and the zinc content is 221mg / kg dry solid. The mortality rate of roundworm eggs is 97.5%, and no live maggots, pupae or newly hatched flies are detected, which meets the standard of "Technical Specifications for Returning Livestock and Poultry Manure to Fields" (GB / T 25246-2010) and can be used as farmyard manure for farmland.

[0056] At the same time, the sewage falls into the anaerobic tank 12 at the bottom along the filter 2. After fermentation in the anaerobic tank 12 for 1 day, it enters the anoxic-aerobic tank 13, aerated for 5 minutes, static for 25 minutes, and hydraulic retention time for 16 hours; the treated sewage is discharged by gravity through the dynamic membrane module 10. The pH of the water is measured to be 7.23, the COD concentration is 28.20 mg / L, and the removal rate is 94.5%; NH4 + -N concentration is 0.03 mg / L, and the removal rate is 99.9%; TN concentration is 10.89 mg / L, and the removal rate is 88.8%; SS concentration is 8.73 mg / L, and the removal rate is 94.2%; TP is 13.86 mg / L, and the removal rate is 33.4%. The effluent quality meets the "Agricultural Irrigation Water Quality Standard" (GB5084-2021) and can be reused as irrigation water.

[0057] Embodiment 2:

[0058] The raw toilet wastewater in Pingyao County was taken from the flush toilet of a family of three. The water quality is as follows: pH 7.95, COD 1163.37 mg / L, TN 134.93 mg / L, NH4 + -N is 101.51 mg / L, TP is 49.50 mg / L, and SS is 210.33 mg / L. Take 8L of the solid-liquid mixture of water-flushing toilet feces and sewage and add it to the rural water-flushing toilet mixed liquid treatment and reuse device provided in this application, use the filter 2 to filter the solid-liquid mixture (water-flushing toilet mixed liquid), so that the solid feces flow along the filter 2 to the upper part of the anoxic-aerobic tank 13 by gravity, and after the solid feces are aerobic fermented for 15 days, 530g of matured feces fertilizer is obtained. The analysis shows that the arsenic content in the mature fertilizer is 4mg / kg dry solid, the copper content is 47mg / kg dry solid, the zinc content is 156mg / kg dry solid, the mortality rate of roundworm eggs is 98.7%, and no live maggots, pupae or newly hatched flies are detected, which meets the standard of "Technical Specifications for Returning Livestock and Poultry Manure to Fields" (GB / T 25246-2010) and can be used as farmyard manure for farmland.

[0059] At the same time, the sewage falls into the anaerobic tank 12 at the bottom along the filter 2. After fermentation in the anaerobic tank 12 for 2 days, it enters the anoxic-aerobic tank 13, aerated for 6 minutes, static for 28 minutes, and hydraulic retention time for 24 hours. The treated sewage is discharged by gravity through the dynamic membrane module 10. The pH of the water is measured to be 7.53, the COD concentration is 68.52 mg / L, and the removal rate is 94.1%; NH4 + -N concentration is 0.12 mg / L, and the removal rate is 99.9%; TN concentration is 22.32 mg / L, and the removal rate is 83.5%; SS concentration is 9.82 mg / L, and the removal rate is 95.3%; TP is 32.8 mg / L, and the effluent quality meets the "Agricultural Irrigation Water Quality Standard" (GB5084-2021) and can be reused as irrigation water.

[0060] If the rural flush toilet mixed liquor treatment and reuse device provided in this application is not used, the effluent will not meet the direct discharge and "Agricultural Irrigation Water Quality Standards" (GB5084-2021), and further treatment is required.

[0061] The comparison cases are as follows:

[0062] Comparative case 1:

[0063] The water was taken from a rural septic tank in Lanzhou City, Gansu Province. The influent properties are as follows: COD is 2511.1 mg / L, TN is 147.3 mg / L, NH4 +-N is 113.3 mg / L, TP is 602.1 mg / L, and SS is 230.69 mg / L.

[0064] After the sewage stayed in the septic tank for 24 hours, the residual COD concentration in the water was measured to be 1001.0 mg / L, with a removal rate of 60.1%; the residual NH4 + -N concentration was 103.5 mg / L, with a removal rate of 8.7%, TN concentration was 49.7 mg / L, with a removal rate of 66.3%, and SS concentration was 98.33 mg / L, with a removal rate of 57.4%. The effluent did not meet the requirements for direct discharge and the Agricultural Irrigation Water Quality Standard (GB5084-2021), and further treatment was required.

[0065] Comparative case 2:

[0066] It was taken from a rural centralized sewage treatment station in Yunnan Province. The influent properties are as follows: COD is 652.0 mg / L, TN is 268.3 mg / L, NH4+-N is 113.0 mg / L, TP is 8.99 mg / L, and SS is 122.6 mg / L.

[0067] The centralized sewage treatment station adopts an integrated AO method sewage treatment process, integrating the regulating tank, anaerobic tank, aerobic tank, secondary sedimentation tank, and sludge tank, and aeration is performed in the oxidation tank. The residual COD concentration in the water was measured to be 185.6 mg / L, with a removal rate of 71.5%; the residual NH4 + -N concentration is 13.3mg / L, TN concentration is 130.3mg / L, and the removal rate is 51.4%; SS concentration is 65.29mg / L, and the removal rate is 46.7%. The one-time investment cost of a centralized sewage treatment station is about 6,000-7,000 yuan / m 3 , additional investment is required to build the entire sewage collection network, and the operating cost is 0.56 yuan / m 3 d. The processing cost is relatively high compared to the method of this application.

[0068] In summary, the present application provides a rural water-flushing toilet mixed liquor treatment and reuse device and method, which separates solid feces and sewage through a filter. Compared with the existing rural toilet sewage treatment method, the sewage treatment difficulty is small and the operating cost is low. The treatment cost of each ton of water-flushing toilet mixed liquor is 0.05-0.2 yuan; the decomposed solid feces after aerobic fermentation treatment can be used as farmyard manure for farmland application; after anaerobic-anoxic-aerobic treatment of flushing toilet sewage, COD, ammonia nitrogen and TN in flushing toilet water can be removed, and the water quality of the effluent can be reused as farmland irrigation water. This method, as a comprehensive treatment method for rural water-flushing toilet mixed liquor, basically solves the problems of high treatment difficulty, high treatment cost and difficulty in reusing feces as fertilizer in the existing rural water-flushing toilet sewage treatment technology. This method has good treatment effect, low one-time investment and operating cost, simple operation and maintenance, and has good promotion and application value in rural toilet renovation.

[0069] A filter is used to separate the solid feces and liquid (sewage) in the mixed liquor of flush toilets, thereby recycling the solid feces as farmyard manure and reducing the pollutant load of sewage in the mixed liquor of flush toilets, thus providing good conditions for subsequent sewage treatment effects.

[0070] Solid feces is aerobically fermented and decomposed using the air escaping from the sewage in the lower anoxic-aerobic tank, organically combining sewage and solid treatment, saving the aeration cost of solid aerobic fermentation; at the same time, compared with anaerobic fermentation, solid aerobic fermentation has better fermentation effect, shorter processing time, and saves equipment floor space and one-time construction investment.

[0071] The rural flush toilet mixed liquor treatment and reuse method of the present application has low energy consumption and operating costs; solid feces are fermented using the residual gas from sewage treatment; at the same time, sewage treatment utilizes intermittent aeration and uses gravity water discharge from dynamic membrane components. Except for intermittent aeration, no additional air supply is required, which greatly reduces the power operating cost of the method, and the sewage treatment cost can be reduced to 0.05-0.2 yuan / ton.

[0072] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0073] The above is a relatively specific and detailed description of the present application through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. A mixed liquid treatment and recycling device for rural flush toilets, It is characterized in that Including the pool body; The left and right ends of the upper part of the tank body are respectively provided with a mixed liquid inlet and a decomposed feces outlet, and the mixed liquid inlet is located above the decomposed feces outlet; an inclined filter screen is provided inside the tank body, and the filter screen is located below the mixed liquid inlet and the decomposed feces outlet, and is inclined along the discharge direction of solid feces; A partition is arranged in the longitudinal direction inside the tank body, and the partition divides the inside of the tank body into an anaerobic tank on the left and an anoxic-aerobic tank on the right. An aeration pipe is arranged inside the anoxic-aerobic tank, and a water outlet is arranged at the lower part of the anoxic-aerobic tank; an opening is arranged in the middle of the partition plate for solid feces and sewage to pass through; The outlet of the decomposed feces is provided with a valve; and the invention also comprises a dynamic membrane component, which is arranged in the anoxic-aerobic pool and close to the water outlet.

2. The mixed liquor treatment and recycling device for rural flush toilets according to claim 1, It is characterized in that The mixed liquid inlet is located at one end of the top of the pool body, and the decomposed feces outlet is located at the upper part of the other side of the pool body.

3. The mixed liquor treatment and recycling device for rural flush toilets according to claim 1, It is characterized in that The filter screen is made of nylon mesh with a mesh size of 400-800 and a slope of 2-5%.

4. The mixed liquor treatment and recycling device for rural flush toilets according to claim 1 or 2, It is characterized in that A support plate is provided at the bottom of the filter screen, and a plurality of through holes are opened on the support plate. The plurality of through holes are used for passing sewage.

5. The mixed liquor treatment and recycling device for rural flush toilets according to claim 4, It is characterized in that The support plate is made of PVC material; the diameter of the through hole is 0.5-1.5 cm.

6. The mixed liquor treatment and recycling device for rural flush toilets according to claim 1, It is characterized in that An air outlet is arranged on the top of the pool body and one side of the anoxic-aerobic pool.

7. The mixed liquor treatment and recycling device for rural flush toilets according to claim 1, It is characterized in that The aeration pipe is a perforated aeration pipe, and there are multiple perforated aeration pipes, which are arranged side by side and at intervals at the bottom of the anoxic-aerobic tank.

8. A method for treating and reusing mixed liquor in rural water-flushing toilets, It is characterized in that The mixed liquor treatment and recycling device for rural flush toilets according to any one of claims 1 to 7 comprises the following steps: Step 1: After the solid-liquid mixture of feces and sewage enters the tank body from the mixed liquid inlet, the solid-liquid mixture is first filtered using a filter screen, so that the separated sewage falls into the lower part of the anaerobic tank under the action of gravity, and the retained solid feces slides directly from the upper part of the anaerobic tank to the upper part of the anoxic-aerobic tank along the filter screen; Step 2: After the solid feces slide directly from the upper part of the anaerobic tank into the upper part of the anoxic-aerobic tank; after staying in the anoxic-aerobic tank for a set time, the matured feces fertilizer is obtained through aerobic fermentation and discharged from the mature feces outlet for farmland utilization; At the same time, after the sewage undergoes anaerobically fermentation in the anaerobic tank for a set residence time, it enters the anoxic-aerobic tank; intermittent aeration is performed using aeration pipes to put the sewage in an anoxic-aerobic cycle, and then it is discharged from the outlet for reuse.

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