A rural sewage gray membrane treatment zero discharge system

Abstract

The utility model discloses a kind of rural sewage grey membrane processing zero discharge systems, belong to rural sewage treatment technical field, including grey water pipeline collection component, sewage treatment plant and reuse pipeline component;Sewage treatment plant includes grey integration structure, high -efficient biofilm formation structure and biological membrane stable structure;Grey integration structure includes grey shell, and be separated into anoxic zone, aerobic zone and sedimentation zone by grey partition wall in grey shell, each grey partition wall top is provided with flow guide groove;High -efficient biofilm formation structure is set in aerobic zone by biological membrane stable structure;High -efficient biofilm formation structure includes several grey PP fiber fillings of load Fe3O4;Biological membrane stable structure includes grey flexible filler frame, each grey PP fiber filling is fixed on grey flexible filler frame. The utility model solves the problems of low processing efficiency, high cost, unstable biological membrane and algal growth in the prior art, and realizes efficient purification treatment of grey water in rural domestic sewage.

Description

Technical Field

[0001] This utility model belongs to the field of rural sewage treatment technology, specifically relating to a zero-discharge system for rural sewage gray membrane treatment, which is applied to the efficient purification treatment of gray water in rural domestic sewage. Background Technology

[0002] In the current field of rural wastewater treatment, there are many key problems that urgently need to be solved: 1. Low efficiency of mixed grey and black wastewater treatment: Traditional rural wastewater treatment processes usually mix grey water (such as laundry, bathing, and kitchen wastewater, with relatively low pollutant concentrations, SS≤200mg / L) with black water (toilet sewage, with high pollutant concentrations, SS≥500mg / L). This mixing leads to large fluctuations in pollutant concentrations and excessively high overall loads, significantly inhibiting biofilm activity. Actual operating data shows that when using traditional mixed treatment processes, COD removal rates are often below 70%, and ammonia nitrogen removal rates are less than 60%, making it difficult to meet increasingly stringent wastewater discharge standards and the needs of rural water environment management. 2. Material defects restrict membrane stability: To reduce costs, some rural wastewater treatment facilities use recycled plastics as materials for treatment equipment. However, recycled plastics often contain harmful substances such as heavy metals (e.g., lead content ≤0.1mg / kg) and plasticizers (e.g., phthalate content ≤1mg / kg). The release of these substances can severely negatively impact microbial activity, causing a decrease of over 30%, which in turn significantly prolongs the biofilm formation cycle, typically exceeding 15 days, increasing the difficulty of starting up and stabilizing wastewater treatment facilities. 3. Biofilm stability is poor, and treatment efficiency is inadequate. Existing biofilm materials generally use ordinary PP fiber packing and packing fixation devices, which have poor biofilm adhesion stability and cannot meet the requirements of high-efficiency adsorption, microbial friendliness, and long-term stability. 4. Because some structures of rural wastewater treatment devices are exposed to the elements, algae growth caused by sunlight during use reduces wastewater treatment efficiency, a problem that needs to be addressed. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the above-mentioned technologies and provide a zero-discharge system for rural sewage treatment using a gray membrane, which solves problems such as low treatment efficiency, high cost, unstable biofilm, and algae growth in the existing technologies.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A zero-discharge system for rural wastewater treatment using a gray membrane membrane is characterized by comprising a gray water pipeline collection assembly, a wastewater treatment device, and a reuse pipeline assembly.

[0006] The grey water collection assembly consists of several grey water collection pipes and a main pipe. The first end of each grey water collection pipe is connected to the laundry drain, bath drain, and kitchen drain of a rural household, respectively, to collect the grey water generated therefrom. The end of each grey water collection pipe is connected to the main pipe, which is connected to the inlet pipe of a sewage treatment device through a pipe. The grey water generated from the laundry drain is rich in surfactants and fabric fiber debris, the grey water generated from the bath drain contains skin metabolites and shower gel residue, and the grey water generated from the kitchen drain contains grease and food residue. The grey water has the characteristics of being synergistically treatable in terms of composition and does not contain highly polluted toilet black water, which is convenient for subsequent unified treatment.

[0007] The wastewater treatment device includes a gray integrated structure, a high-efficiency biofilm structure, and a biofilm stabilization structure. The gray integrated structure includes a gray shell, which is divided into an anoxic zone, an aerobic zone, and a sedimentation zone by gray partitions. Each gray partition has a flow guide channel at its top. The high-efficiency biofilm structure is located in the aerobic zone via the biofilm stabilization structure, and a gray microporous aeration device is installed in the aerobic zone. The high-efficiency biofilm structure includes several gray PP fiber packings loaded with Fe3O4. The biofilm stabilization structure includes a gray flexible packing frame, on which each gray PP fiber packing is fixed.

[0008] The reuse pipeline assembly includes a purified water discharge pipeline and a purified water reuse pipeline connected in sequence. The purified water discharge pipeline is connected to the outlet pipe of the sewage treatment device and is used to discharge purified water treated by the sewage treatment device. The purified water reuse pipeline is equipped with a shower head for watering flowers or an inlet connected to the laundry area, so as to transport the purified water discharged from the purified water discharge pipeline to the laundry area or for watering flowers, thereby realizing reuse.

[0009] A further improvement of this utility model is that an inlet pipe is provided at the top of the anoxic zone, the inlet pipe extends to the bottom of the anoxic zone, and an outlet pipe is provided at the top of the sedimentation zone.

[0010] A further improvement of this utility model is that the gray flexible filler frame includes an elastic rubber pad and springs. Multiple sets of springs are provided, and the multiple sets of springs are connected to each other to form a hollow three-dimensional mesh frame. The elastic rubber pad covers the periphery of the hollow three-dimensional mesh frame formed by the springs. Several buckles are provided on the outer wall of the elastic rubber pad. Each gray PP fiber filler is fixed to the buckles of the gray flexible filler frame by LLDPE straps and arranged in a three-dimensional staggered manner. The springs are set in the gray flexible filler frame and evenly distributed inside the elastic rubber pad, which can give the entire filler frame elasticity and cushioning performance, and at the same time provide support for the elastic rubber pad.

[0011] A further improvement of this utility model is that the sewage treatment devices are arranged in parallel in several groups, the main pipe of the grey water pipe collection assembly is connected to the inlet pipe of each sewage treatment device through a pipe, and a flow valve is provided on the connecting pipe between the main pipe and the inlet pipe; the outlet pipe of each sewage treatment device is connected to the reuse pipe assembly through a pipe.

[0012] A further improvement of this utility model is that the gray partition wall is an integrated injection-molded partition wall.

[0013] A further improvement of this invention is that the diameter of the gray PP fiber filler is 0.1-0.3 mm, the fiber contact angle is ≤25°, and the specific surface area is ≥800 m². 2 / m 3 With an Fe3O4 content of ≥20%, a gray film can be formed rapidly.

[0014] A further improvement of this invention is that the parameters of the gray microporous aeration device are set to a pore diameter of 0.1-0.3 mm and a bubble rising speed of ≤0.3 m / s, so as to avoid biofilm erosion.

[0015] A further improvement of this utility model is that the gray housing is formed by connecting an upper housing and a lower housing through a flange, and an upwardly extending annular boss is formed at the flange edge of the lower housing, so that it can adapt to different installation environments and ensure long-term stable operation.

[0016] A further improvement of this utility model is that the thickness of the gray shell is ≥8mm, the height ratio of the upper shell to the lower shell is less than 3:7, and the height of the annular boss is 50mm.

[0017] A further improvement of this utility model is that the gray shell and all internal components of the wastewater treatment device are made of brand new, non-recyclable materials.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. By using separate treatment for grey water, the load of mixed treatment of black and grey water can be avoided. It can efficiently remove pollutants such as COD, ammonia nitrogen, and total phosphorus from wastewater, and the treatment effect is significantly better than that of traditional treatment systems.

[0020] 2. All components of the wastewater treatment device are made of gray material. On the one hand, compared with light-colored materials, it can block light, inhibit algae photosynthesis, and prevent algae from accumulating and growing on the surface of the water. On the other hand, compared with black materials, it can prevent excessive heat absorption and excessively high temperature, maintain stable water temperature, ensure a good microbial breeding environment, and ensure wastewater treatment effect and efficiency.

[0021] 3. All components of the wastewater treatment device are made of brand new, non-recycled materials to prevent the use of recycled plastics and to prevent the heavy metals and plasticizers in recycled plastics from having a serious negative impact on microbial activity.

[0022] 4. The gray PP fiber packing material loaded with Fe3O4 is used. Compared with conventional PP fiber packing material, it has better efficiency in microbial attachment and pollutant removal, and can effectively meet the requirements of high-efficiency adsorption, microbial friendliness and long-term stability.

[0023] 5. This utility model constructs an overall multi-circulation and local vortex micro-circulation flow pattern through the coordinated design of gray partition walls, gray flexible packing frame and gray shell, which extends the residence time of sewage in the packing between 30%-50% and increases the mass transfer coefficient by more than 20%. By optimizing the flow pattern, it achieves efficient biodegradation of pollutants. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the wastewater treatment device of this utility model.

[0026] In the diagram: 1. Grey water pipe collection assembly; 2. Sewage treatment device; 3. Reuse pipe assembly; 4. Grey shell; 5. Grey partition wall; 6. Anoxic zone; 7. Aerobic zone; 8. Sedimentation zone; 9. Guide channel; 10. Grey microporous aeration device; 11. Grey PP fiber packing; 12. Grey flexible packing frame; 13. Inlet pipe; 14. Outlet pipe; 15. Elastic rubber pad; 16. Buckle; 17. LLDPE strap; 18. Flow valve; 19. Upper shell; 20. Lower shell; 21. Annular boss. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0028] like Figure 1-2 As shown, a zero-discharge system for rural wastewater gray membrane treatment includes a gray water pipeline collection assembly 1, a wastewater treatment device 2, and a reuse pipeline assembly 3.

[0029] The grey water collection assembly 1 consists of several grey water collection pipes and a main pipe. The first end of each grey water collection pipe is connected to the laundry drain, bath drain, and kitchen drain of a rural household, respectively, to collect the grey water generated therefrom. The end of each grey water collection pipe is connected to the main pipe, which is connected to the inlet pipe 13 of the sewage treatment device 2 through a pipe. The grey water generated from the laundry drain is rich in surfactants and fabric fiber debris, the grey water generated from the bath drain contains skin metabolites and shower gel residue, and the grey water generated from the kitchen drain contains grease and food residue. The grey water has the characteristics of being synergistically treatable in terms of composition and does not contain highly polluted toilet black water, which is convenient for subsequent unified treatment.

[0030] Wastewater treatment device 2 includes a gray integrated structure, a high-efficiency biofilm structure, and a biofilm stabilization structure. The gray integrated structure includes a gray shell 4, which is divided into an anoxic zone 6, an aerobic zone 7, and a sedimentation zone 8 by gray partitions 5. Each gray partition 5 has a guide channel 9 at its top. The high-efficiency biofilm structure is located in the aerobic zone 7 through the biofilm stabilization structure, and a gray microporous aeration device 10 is installed in the aerobic zone 7. The high-efficiency biofilm structure includes several gray PP fiber packings 11 loaded with Fe3O4. The biofilm stabilization structure includes a gray flexible packing frame 12, and each gray PP fiber packing 11 is fixed on the gray flexible packing frame 12.

[0031] The reuse pipeline assembly 3 includes a purified water discharge pipeline and a purified water reuse pipeline connected in sequence. The purified water discharge pipeline is connected to the outlet pipe 14 of the sewage treatment device 2 and is used to discharge the purified water treated by the sewage treatment device 2. The purified water reuse pipeline is equipped with a shower head for watering flowers or an inlet connected to the laundry area, so as to transport the purified water discharged from the purified water discharge pipeline to the laundry area or for watering flowers, thereby realizing reuse.

[0032] In this embodiment, an inlet pipe 13 is provided at the top of the anoxic zone 6, and the inlet pipe 13 extends to the bottom of the anoxic zone 6. An outlet pipe 14 is provided at the top of the sedimentation zone 8.

[0033] In this embodiment, the gray flexible filler frame 12 includes an elastic rubber pad 15 and springs. Multiple sets of springs are provided, and the multiple sets of springs are connected to each other to form a hollow three-dimensional mesh frame. The elastic rubber pad 15 covers the periphery of the hollow three-dimensional mesh frame formed by the springs. Several buckles 16 are provided on the outer wall of the elastic rubber pad 15. Each gray PP fiber filler 11 is fixed to the buckles 16 of the gray flexible filler frame 12 by LLDPE straps 17 and is arranged in a three-dimensional staggered manner. The springs are provided in the gray flexible filler frame 12 and are evenly distributed inside the elastic rubber pad 15, which can give the entire filler frame elasticity and cushioning performance, and also provide support for the elastic rubber pad 15.

[0034] In this embodiment, several groups of sewage treatment devices 2 are arranged in parallel. The main pipe of the grey water pipe collection assembly 1 is connected to the inlet pipe 13 of each sewage treatment device 2 through pipes, and a flow valve 18 is provided on the connecting pipe between the main pipe and the inlet pipe 13. The outlet pipe 14 of each sewage treatment device 2 is connected to the reuse pipe assembly 3 through pipes.

[0035] In this embodiment, the gray partition wall 5 is an integrated injection-molded partition wall.

[0036] In this embodiment, the gray PP fiber filler 11 has a diameter of 0.1-0.3 mm, a fiber contact angle ≤25°, and a specific surface area ≥800 m². 2 / m 3 With an Fe3O4 content of ≥20%, a gray film can be formed rapidly.

[0037] In this embodiment, the parameters of the gray microporous aeration device 10 are set as follows: pore size 0.1-0.3mm and bubble rising speed ≤0.3m / s, to avoid biofilm erosion.

[0038] In this embodiment, the gray housing 4 is formed by connecting the upper housing 19 and the lower housing 20 through a flange, and an upwardly extending annular boss 21 is formed at the flange edge of the lower housing 20, so that it can adapt to different installation environments and ensure long-term stable operation.

[0039] In this embodiment, the thickness of the gray shell 4 is ≥8mm, the height ratio of the upper shell 19 to the lower shell 20 is less than 3:7, and the height of the annular boss 21 is 50mm.

[0040] In this embodiment, the gray shell 4 of the sewage treatment device 2 and all its internal components are made of brand new, non-recyclable materials.

[0041] Further description of this utility model:

[0042] I. Fabrication of Wastewater Treatment Device 2:

[0043] The gray shell 4 of the wastewater treatment device 2 is made of brand-new gray PP material, with the lower part accounting for 75%. The reasonable size design ensures effective wastewater treatment and retention time within the device. During manufacturing, the height of the annular protrusion 21 at the junction of the upper and lower parts of the tank is strictly controlled to 50mm to ensure a groundwater permeability coefficient ≤0.001mm / h. The shell thickness reaches 8mm, making it resistant to soil lateral pressure ≥0.1MPa. After manufacturing, the tank is mechanically sealed to ensure its sealing and stability.

[0044] Among them, the gray shell 4, gray flexible packing frame 12, gray partition wall 5, and gray PP fiber packing 11 of the sewage treatment device 2 are all made of brand-new gray PP material, with 5% food-grade iron oxide pigment (particle size ≤1μm) added. This material has unique optical properties, with an absorbance of 60-70% and an ultraviolet reflectance ≤10%, which can effectively inhibit algae growth and keep the algae biomass ≤10. 3 The density of cells / mL avoids the negative impact of excessive algae growth on wastewater treatment efficiency, while ensuring that the material is safe, non-toxic, and meets environmental protection requirements.

[0045] II. Wastewater Treatment Process:

[0046] The collected grey water enters the wastewater treatment device 2 through flow valve 18, controlling the inlet flow velocity to be ≤0.1m / s, ensuring the wastewater contact time with the packing material is ≥30min. In the anoxic zone 6, the grey water undergoes a reaction that decomposes large organic molecules into smaller ones, creating conditions for subsequent treatment.

[0047] The greywater treated in the anoxic zone 6 enters the aerobic zone 7, where it undergoes efficient removal of pollutants such as COD, ammonia nitrogen, and total phosphorus on the surface of grey PP fiber filler 11 loaded with Fe3O4 through a three-way coupling effect of adsorption-biological-solidification.

[0048] During operation, the dissolved oxygen concentration in the aerobic zone 7 is monitored in real time using an online DO monitoring device, and is linked with the gray microporous aeration device 10, with an aeration intensity of 0.8 m³ / s. 3 The dissolved oxygen (DO) concentration is automatically controlled at 2-3 mg / L per hour to provide a suitable living environment for microorganisms and ensure effective wastewater treatment. The membrane growth rate is controlled at 0.1-0.3 mm / d. Once the membrane reaches a certain thickness, the backwashing cycle is determined based on the operating conditions to ensure a backwashing cycle of ≥90 days, maintaining the stable and efficient operation of the purification tank.

[0049] III. Practical Application:

[0050] The influent greywater has a COD of 280 mg / L, an ammonia nitrogen of 28 mg / L, and a total phosphorus of 4.5 mg / L, representing the typical water quality of greywater from rural domestic use.

[0051] Effluent: COD 22mg / L, ammonia nitrogen 2.1mg / L, total phosphorus 0.6mg / L. All indicators meet the Class A standard of GB 18918-2002, indicating that this system can efficiently purify rural domestic greywater.

[0052] Membrane formation cycle: 15 days, which is significantly shorter than traditional processes. The rapidly formed gray membrane can quickly play a role in wastewater treatment.

[0053] Stable operation: During 12 months of stable operation, the membrane thickness remained at 2.5±0.3mm, and the backwashing cycle was extended to 12 months, demonstrating the stability and reliability of the system and reducing maintenance costs and frequency.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A rural sewage grey membrane treatment zero discharge system characterized in that, This includes greywater pipeline collection components, wastewater treatment devices, and reuse pipeline components; The grey water collection assembly consists of several grey water collection pipes and a main pipe. The first end of each grey water collection pipe is connected to the laundry drain, bath drain, and kitchen drain of a rural household, respectively. The end of each grey water collection pipe is connected to the main pipe, which is connected to the inlet pipe of the sewage treatment device through a pipe. The wastewater treatment device includes a gray integrated structure, a high-efficiency biofilm structure, and a biofilm stabilization structure. The gray integrated structure includes a gray shell, which is divided into an anoxic zone, an aerobic zone, and a sedimentation zone by gray partitions. Each gray partition has a flow guide channel at its top. The high-efficiency biofilm structure is located in the aerobic zone via the biofilm stabilization structure, and a gray microporous aeration device is installed in the aerobic zone. The high-efficiency biofilm structure includes several gray PP fiber packings loaded with Fe3O4. The biofilm stabilization structure includes a gray flexible packing frame, on which each gray PP fiber packing is fixed. The reuse pipeline assembly includes a purified water discharge pipeline and a purified water reuse pipeline connected in sequence. The purified water discharge pipeline is connected to the outlet pipe of the sewage treatment device, and the purified water reuse pipeline is equipped with a water sprayer for watering flowers or an inlet for connecting to the laundry area.

2. A rural sewage greywater membrane treatment zero-emission system according to claim 1, characterized in that, An inlet pipe is installed at the top of the anoxic zone, extending to the bottom of the anoxic zone, and an outlet pipe is installed at the top of the sedimentation zone.

3. The rural sewage greywater membrane treatment zero-emission system according to claim 1, characterized in that, The gray flexible filler frame includes an elastic rubber pad and springs. Multiple sets of springs are provided, and the multiple sets of springs are connected to each other to form a hollow three-dimensional mesh frame. The elastic rubber pad covers the periphery of the hollow three-dimensional mesh frame formed by the springs. Several buckles are provided on the outer wall of the elastic rubber pad. Each gray PP fiber filler is fixed to the buckles of the gray flexible filler frame by LLDPE straps and is arranged in a three-dimensional staggered manner.

4. The rural sewage greywater membrane treatment zero-emission system according to claim 1, characterized in that, The wastewater treatment devices are arranged in several groups in parallel. The main pipe of the grey water collection assembly is connected to the inlet pipe of each of the wastewater treatment devices through a pipe, and a flow valve is installed on the connecting pipe between the main pipe and the inlet pipe. The outlet pipe of each of the wastewater treatment devices is connected to the reuse pipe assembly through a pipe.

5. The rural sewage greywater membrane treatment zero-emission system according to claim 1, characterized in that, The gray partition wall is an integral injection-molded partition wall.

6. The rural sewage greywater membrane treatment zero-emission system according to claim 1, characterized in that, The diameter of the grey PP fiber filler is 0.1-0.3mm, the fiber filament contact angle is ≤25°, the specific surface area is ≥800m 2 / m 3 , and the Fe3O4 content is ≥20%.

7. A rural greywater membrane treatment zero discharge system according to claim 1, characterized in that, The parameters of the gray microporous aeration device are set as follows: pore size 0.1-0.3mm and bubble rising speed ≤0.3m / s.

8. The rural sewage greywater membrane treatment zero-emission system according to claim 1, characterized in that, The gray shell is composed of an upper shell and a lower shell connected by a flange, and an upward-extending annular boss is formed at the edge of the flange of the lower shell.

9. The rural sewage greywater membrane treatment zero-emission system according to claim 1, characterized in that, The thickness of the gray shell is ≥8mm, the height ratio of the upper shell to the lower shell is less than 3:7, and the height of the annular boss is 50mm.

10. The rural sewage greywater membrane treatment zero-emission system according to claim 1, characterized in that, The gray shell and all internal components of the wastewater treatment device are made of brand new, non-recyclable materials.

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