A rural grey water resource utilization and nitrogen and phosphorus enrichment recovery device

Abstract

The present application relates to grey water treatment technical field, especially to a kind of rural grey water resource utilization and nitrogen and phosphorus enrichment recovery device;Including purification tank, first circulation system, second circulation system and controller, purification tank includes anaerobic tank, deodorization pool, ammonia nitrogen adsorption pool and phosphorus removal pool, first circulation system is arranged between deodorization pool and ammonia nitrogen adsorption pool, second circulation system is arranged at the end of phosphorus removal pool far from ammonia nitrogen adsorption pool, computing module is provided in controller, and computing module is used to calculate first circulation time and second circulation time;Controller controls first circulation system, so that grey water carries out anaerobic deodorization circulation in first circulation system, anaerobic tank and deodorization pool for first circulation time;Controller controls second circulation system, so that grey water carries out nitrogen and phosphorus removal cycle in second circulation system, ammonia nitrogen adsorption pool and phosphorus removal pool for second circulation time;Both can guarantee the treatment effect of grey water, also can guarantee the utilization efficiency of grey water.

Description

Technical Field

[0001] This invention relates to the field of greywater treatment technology, and in particular to a device for the resource utilization and nitrogen and phosphorus enrichment and recovery of greywater in rural areas. Background Technology

[0002] With the development of society and the rural economy, water consumption is increasing daily, and domestic sewage is also growing rapidly, making rural domestic sewage a significant factor affecting the environment. Domestic sewage can be divided into black water and grey water according to the degree of pollution and its source. Black water contains feces and urine; it mainly contains feces, but by collecting it in sealed containers and subjecting it to anaerobic fermentation, it can actually become a nutrient-rich fertilizer. This fertilizer can be used for farmland irrigation, increasing soil nutrient content, thereby increasing crop yields and generating certain economic benefits. Grey water mainly includes wastewater from kitchens, washbasins, showers, and floor drains, accounting for about 70% of total domestic sewage. Although grey water has a lower concentration of pollutants, its discharge volume is large, and it is often discharged directly into the environment without any treatment. Therefore, grey water often poses a greater potential threat and destructive force to the environment than black water, thus being detrimental to soil health and agricultural development.

[0003] The existing rural domestic sewage treatment model still has the following problems: (1) The construction and operation costs of the current decentralized rural domestic sewage treatment facilities are high. The average construction cost of sewage treatment facilities such as septic tanks and purification tanks is relatively high. At the same time, the operation and maintenance requirements and costs of sewage treatment facilities are also relatively high. For example, purification tanks need to be cleaned regularly, and some need to add chemicals. (2) The average construction cost of the household included in the urban sewage pipe network and the relatively centralized treatment model is relatively high, which puts great pressure on local fiscal expenditure. On the other hand, in the sampling pipe network collection and treatment model, due to the difficulty in ensuring the quality of pipe network construction, sewage leakage occurs, resulting in low influent pollutant concentration in centralized treatment facilities and low pollutant collection efficiency. The expected pollutant reduction effect of rural domestic sewage has not been achieved. The traditional pipe network, relatively centralized and decentralized treatment models are not suitable for construction and promotion in hilly and water network areas with relatively weak economic conditions. (3) Domestic sewage treatment has rich potential for carbon reduction and resource utilization, but traditional treatment models have not effectively utilized nitrogen, phosphorus and water resources in sewage, resulting in low resource utilization. In order to ensure the collection and utilization rate of rural domestic sewage, it is necessary to add collection pipe networks, operating equipment or expand the land area of ​​sewage treatment facilities.

[0004] Therefore, there is an urgent need to provide a rural greywater resource utilization and nitrogen and phosphorus enrichment and recovery device, which can improve greywater treatment and utilization efficiency and ensure greywater treatment effect compared with existing technologies. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art and provides a device for the resource utilization and nitrogen and phosphorus enrichment and recovery of rural greywater.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A rural greywater resource utilization and nitrogen and phosphorus enrichment and recovery device includes a purification tank, a first circulation system, a second circulation system, and a controller. The purification tank includes an anaerobic tank, a deodorization tank, an ammonia nitrogen adsorption tank, and a phosphorus removal tank. The first circulation system is arranged between the deodorization tank and the ammonia nitrogen adsorption tank. The second circulation system is arranged at the end of the phosphorus removal tank away from the ammonia nitrogen adsorption tank. The first circulation system, the second circulation system, and the controller are electrically connected. The controller is equipped with a calculation module for calculating the first circulation time and the second circulation time.

[0008] The controller controls the first circulation system, so that the grey water undergoes anaerobic deodorization circulation for a first circulation time in the first circulation system, the anaerobic tank and the deodorization tank;

[0009] The controller controls the second circulation system, causing the greywater to undergo a second cycle of nitrogen and phosphorus removal circulation within the second circulation system, the ammonia nitrogen adsorption tank, and the phosphorus removal tank.

[0010] Furthermore, the anaerobic tank is filled with a first packing material, the deodorization tank is filled with a second packing material, the ammonia nitrogen adsorption tank is filled with a third packing material, and the phosphorus removal tank is filled with a fourth packing material; the first packing material includes spherical biological packing material and powdered fermentation agent, the second packing material is volcanic rock, the third packing material is natural zeolite, and the fourth packing material includes ore and phosphorus removal agent.

[0011] Furthermore, the spherical biological packing material has a shell, which is a hollow structure, and the shell is made of polypropylene. The shell is filled with polyurethane. The fermentation agent includes acid-resistant Lactobacillus and Ralstonia petrelli, with the abundance of acid-resistant Lactobacillus greater than 80%.

[0012] Furthermore, the deodorization tank, the ammonia nitrogen adsorption tank, and the phosphorus removal tank are all equipped with support plates, and the second packing material, the third packing material, and the fourth packing material are all installed on the support plates.

[0013] Furthermore, the first packing material accounts for 80% of the effective volume of the anaerobic tank, the second packing material accounts for 60% of the effective volume of the deodorization tank, the third packing material accounts for 80% of the effective volume of the ammonia nitrogen adsorption tank, and the fourth packing material accounts for 80% of the effective volume of the phosphorus removal tank.

[0014] Furthermore, the first circulation system includes a first circulation tank and a first circulation pipe. The first circulation tank is located between the deodorization tank and the ammonia nitrogen adsorption tank. A main inlet pipe is connected to the side wall of the anaerobic tank. One end of the first circulation pipe is connected to the bottom of the first circulation tank, and the other end of the first circulation pipe is connected to the main inlet pipe. A first valve is provided at the connection between the first circulation pipe and the first circulation tank, and a third valve is provided at the connection between the first circulation pipe and the main inlet pipe. The first circulation tank and the ammonia nitrogen adsorption tank are connected. A second valve is provided at the connection between the first circulation tank and the ammonia nitrogen adsorption tank. A first flow sensor is provided at the bottom of the first circulation tank. An inlet valve is connected in series on the main inlet pipe. When the controller receives a signal detected by the first flow sensor, the controller controls the first valve and the third valve to open, and the controller controls the second valve and the inlet valve to close. The grey water undergoes anaerobic deodorization circulation for a first circulation time in the first circulation tank, the anaerobic tank, and the deodorization tank.

[0015] Furthermore, a first flow rate sensor is installed on the inner wall of the anaerobic tank, and a second flow rate sensor is installed on the inner wall of the deodorization tank. The first circulation tank and the deodorization tank are connected through a third inlet pipe. The first circulation time is calculated using the following formula:

[0016] when hour,

[0017] when hour,

[0018] In the above formula, COD1 represents the COD value in the input grey water, COD0 represents the standard COD value; T1 represents the first cycle time, V1 represents the effective volume of the anaerobic tank or deodorization tank, V2 represents the volume of the third inlet pipe, Q1 represents the flow rate detected by the first flow rate sensor, and Q2 represents the flow rate detected by the second flow rate sensor.

[0019] Furthermore, the second circulation system includes a second circulation tank and a second circulation pipe. The second circulation tank is located at the end of the phosphorus removal tank away from the ammonia nitrogen adsorption tank. One end of the second circulation pipe is connected to the bottom of the second circulation tank, and the other end of the second circulation pipe is connected to the bottom of the ammonia nitrogen adsorption tank. A fourth valve is provided at the connection between the second circulation pipe and the second circulation tank, and a fifth valve is provided at the connection between the second circulation pipe and the ammonia nitrogen adsorption tank. A second flow sensor is provided at the bottom of the second circulation tank. When the controller receives the detection signal from the second flow sensor, the controller controls the fourth and fifth valves to open, and the grey water undergoes a second circulation time for nitrogen and phosphorus removal circulation within the second circulation tank, the ammonia nitrogen adsorption tank, and the phosphorus removal tank.

[0020] Furthermore, a third flow rate sensor is installed on the inner wall of the ammonia nitrogen adsorption tank, and a fourth flow rate sensor is installed on the inner wall of the phosphorus removal tank. The second circulation tank is connected to the phosphorus removal tank through a sixth inlet pipe. The second circulation time is calculated using the following formula:

[0021] when hour,

[0022] when hour,

[0023] In the above formula, NH1 represents the ammonia nitrogen value in the input grey water, NH0 represents the standard ammonia nitrogen value, TP1 represents the total phosphorus value in the input grey water, TP0 represents the standard total phosphorus value, TN1 represents the total nitrogen value in the input grey water, and TN0 represents the standard total nitrogen value; Q3 represents the flow rate detected by the third flow rate sensor, Q4 represents the flow rate detected by the fourth flow rate sensor, w1 represents the weight value of ammonia nitrogen, w2 represents the weight value of total phosphorus, w3 represents the weight value of total nitrogen, V3 represents the effective volume of the ammonia nitrogen adsorption tank or phosphorus removal tank, and V4 represents the volume of the sixth inlet pipe.

[0024] Furthermore, the relationship between w1, w2, and w3 satisfies the following equation:

[0025] w1+w2+w3=1;

[0026] |w1-w2|<α;

[0027] |w1-w3|<α;

[0028] |w3-w2|<α;

[0029] α represents a constant, and α takes values ​​from 0.1 to 0.2.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] (1) The present invention performs anaerobic deodorization cycle and nitrogen and phosphorus removal cycle on the input grey water, and performs anaerobic deodorization cycle for the first cycle time and nitrogen and phosphorus removal cycle for the second cycle time. The first cycle time and the second cycle time are set according to the farmland irrigation water quality standards, rural domestic sewage discharge water quality indicators and the values ​​of various indicators in the input grey water. The first cycle time and the second cycle time are different depending on the values ​​of various indicators in the input grey water, so as to ensure both the treatment effect of grey water and the utilization efficiency of grey water.

[0032] (2) The present invention calculates the first cycle time based on the COD value of the input grey water and the standard COD value, and calculates the second cycle time based on the ammonia nitrogen value, total nitrogen value and total phosphorus value and the standard ammonia nitrogen value, standard total nitrogen value and standard total phosphorus value. The calculation of the first cycle time and the second cycle time is more accurate, further ensuring the treatment effect and efficiency of grey water, so that the treated grey water can be fully utilized. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0034] Figure 2 This is a schematic diagram of the overall structure of Example 2.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Slag and oil separator; 2. Anaerobic tank; 3. Deodorization tank; 4. Ammonia nitrogen adsorption tank; 5. Phosphorus removal tank; 6. First packing material; 7. Second packing material; 8. Third packing material; 9. Fourth packing material; 10. Support plate; 11. Main inlet pipe; 12. Main outlet pipe; 13. First inlet pipe; 14. Second inlet pipe; 15. Third inlet pipe; 16. Fourth inlet pipe; 17. Fifth inlet pipe; 18. First circulation tank; 19. First circulation pipe; 20. First valve; 21. Second valve; 22. Third valve; 23. Second circulation tank; 24. Second circulation pipe; 25. Fourth valve; 26. Fifth valve; 27. Sixth valve; 28. Inlet valve; 29. ​​Sixth inlet pipe. Detailed Implementation

[0037] The technical solution of the present invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention. It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0038] Example 1

[0039] like Figure 1As shown, this embodiment provides a rural grease trap resource utilization and nitrogen and phosphorus enrichment and recovery device, including a grease trap 1 and a purification tank. The inlet end of the purification tank is connected to a main water inlet pipe 11, and the outlet end of the purification tank is provided with a main water outlet pipe 12. The inlet end of the grease trap 1 is connected to kitchen sewage, and the outlet end of the grease trap 1 is connected to the main water inlet pipe 11. The main water inlet pipe 11 is also connected to other sewage. The purification tank includes an anaerobic tank 2, a deodorizing tank 3, an ammonia nitrogen adsorption tank 4, and a phosphorus removal tank 5. The anaerobic tank 2, deodorizing tank 3, and ammonia nitrogen adsorption tank 4 are... The volume of the ash water entering the purification tank is the same as that of the phosphorus removal tank 5. The ash water first flows into the anaerobic tank 2 for anaerobic fermentation, where the organic matter in the ash water is decomposed and some pollutants are removed. Then it flows into the deodorization tank 3 to remove the malodorous odor from the ash water and make it meet the irrigation standards. The ash water that is not used for irrigation flows into the ammonia nitrogen adsorption tank 4 and the phosphorus removal tank 5 in sequence to adsorb the nitrogen and phosphorus in the ash water. The water after nitrogen and phosphorus removal treatment can be directly discharged or reused. Water reuse includes greening irrigation, vehicle washing, and road cleaning.

[0040] The anaerobic tank 2 is filled with a first packing material 6. A first inlet pipe 13 is installed on the upper end of one side wall of the anaerobic tank 2. The upper end of the first inlet pipe 13 is connected to the main inlet pipe 11. The lower end of the first inlet pipe 13 is located near the bottom of the anaerobic tank 2. The volume of the first packing material 6 is 80% of the effective volume of the anaerobic tank 2. The first packing material 6 includes spherical biological packing material and powdered fermentation agent. The powdered fermentation agent is 200-400g. The diameter of the spherical biological packing material is 80-150mm. The outer shell of the spherical biological packing material adopts a hollow structure. The outer shell material of the spherical biological packing material is polypropylene. The inside of the spherical biological packing material is filled with polyurethane packing material. The fermentation agent includes acid-resistant Lactobacillus and Ralstonia pelargonifolia. The abundance of acid-resistant Lactobacillus reaches more than 80%. The fermentation agent can effectively degrade organic matter in ash water and effectively inactivate pathogenic microorganisms in ash water. The fermentation agent is added to the anaerobic tank 2 after stirring with water for 4 hours.

[0041] The deodorization tank 3 is filled with a second packing material 7. A second water inlet pipe 14 is installed on the upper end of one side wall of the deodorization tank 3. The upper end of the second water inlet pipe 14 is connected to the interior of the anaerobic tank 2. The lower end of the second water inlet pipe 14 is located near the bottom of the deodorization tank 3. The volume of the second packing material 7 accounts for 60% of the effective volume of the deodorization tank 3. The second packing material 7 is reddish-brown volcanic rock with a size of 20-50mm. The second packing material 7 has uniform particles and many pores for air permeability.

[0042] The ammonia nitrogen adsorption tank 4 is filled with a third packing material 8. A third water inlet pipe 15 is installed on the upper end of one side wall of the ammonia nitrogen adsorption tank 4. The upper end of the third water inlet pipe 15 is connected to the interior of the deodorization tank 3. The lower end of the third water inlet pipe 15 is located near the bottom of the ammonia nitrogen adsorption tank 4. The volume of the third packing material 8 accounts for 80% of the effective volume of the ammonia nitrogen adsorption tank 4. The third packing material 8 is in the form of crushed stone flakes with a size of 2-8mm. The third packing material 8 is made of natural zeolite and is rich in a variety of high-quality mineral elements.

[0043] The phosphorus removal tank 5 is filled with a fourth packing material 9. A fourth water inlet pipe 16 is provided at the upper end of one side wall of the phosphorus removal tank 5. The upper end of the fourth water inlet pipe 16 is connected to the interior of the ammonia nitrogen adsorption tank 4. The lower end of the fourth water inlet pipe 16 is located near the bottom of the phosphorus removal tank 5. The volume of the fourth packing material 9 accounts for 80% of the effective volume of the phosphorus removal tank 5. The fourth packing material 9 is spherical with a size of 4-8mm. The fourth packing material 9 is extruded from ore and phosphorus removal agent and has the characteristics of being porous and lightweight. The main water outlet pipe 12 is located at the upper end of one side wall of the phosphorus removal tank 5.

[0044] The deodorization tank 3, the ammonia nitrogen adsorption tank 4 and the phosphorus removal tank 5 are all equipped with support plates 10. The second packing material 7, the third packing material 8 and the fourth packing material 9 are set above the corresponding support plates 10. The lower ends of the second water inlet pipe 14, the third water inlet pipe 15 and the fourth water inlet pipe 16 are all set below the support plates 10.

[0045] The grey water enters the first inlet pipe 13 through the main inlet pipe 11. The grey water flows to the bottom of the anaerobic tank 2 through the first inlet pipe 13. The grey water in the anaerobic tank 2 flows from bottom to top. After fully reacting with the first packing material 6, it flows into the bottom of the deodorization tank 3 through the second inlet pipe 14. The grey water flows from bottom to top in the deodorization tank 3, fully contacting the second packing material 7 to carry out the deodorization reaction. After the grey water reaches the irrigation standard after deodorization, part of the grey water is used for irrigation. The remaining grey water flows into the bottom of the ammonia nitrogen adsorption tank 4 through the third inlet pipe 15. The grey water flows from bottom to top in the ammonia nitrogen adsorption tank 4, fully contacting the third packing material 8 to carry out the ammonia nitrogen removal operation. Then the grey water flows into the bottom of the phosphorus removal tank 5 through the fourth inlet pipe 16. The grey water also flows from bottom to top in the phosphorus removal tank 5, fully contacting the fourth packing material 9 to carry out the phosphorus removal operation. The grey water after reaction in the phosphorus removal tank 5 flows out through the main outlet pipe 12.

[0046] Example 2

[0047] Compared with Embodiment 1, this embodiment also includes a controller, a first circulation system, and a second circulation system. The controller is equipped with a calculation module. The first circulation system is used to perform anaerobic deodorization circulation of the ash water, and the second circulation system is used to perform nitrogen and phosphorus removal circulation of the ash water. The calculation module is used to calculate the first circulation time of the anaerobic deodorization circulation and the second circulation time of the nitrogen and phosphorus removal circulation. The controller controls the first circulation system to perform anaerobic deodorization circulation of the ash water for the first circulation time. The controller controls the second circulation system to perform nitrogen and phosphorus removal circulation of the ash water for the second circulation time.

[0048] The first circulation system includes a first circulation tank 18, a first valve 20, a second valve 21, and a third valve 22. The first circulation tank 18 is located between the deodorization tank 3 and the ammonia nitrogen adsorption tank 4. A third inlet pipe 15 is located inside the first circulation tank 18, with its upper end positioned on the upper side wall of one side of the first circulation tank 18 and its lower end positioned near the bottom of the first circulation tank 18. A fifth inlet pipe 17 is installed on the side wall of the ammonia nitrogen adsorption tank 4, below the support plate 10 inside the ammonia nitrogen adsorption tank 4. A first circulation pipe 19 is installed at the lower end of the first circulation tank 18, with one end of the first circulation pipe 19 connected to the first circulation tank 18. The internal circulation pool 18 is interconnected. The other end of the first circulation pipe 19 is connected to the main inlet pipe 11. A first valve 20 is installed at the connection between the first circulation pipe 19 and the first circulation pool 18. A second valve 21 is installed at the connection between the fifth inlet pipe 17 and the first circulation pool 18. A third valve 22 is installed at the connection between the first circulation pipe 19 and the main inlet pipe 11. A first flow rate sensor is installed on the side wall of the anaerobic pool 2, which is located below the inlet of the second inlet pipe 14. A second flow rate sensor is installed on the side wall of the deodorization pool 3, which is located below the inlet of the third inlet pipe 15. A first flow sensor is installed at the bottom of the first circulation pool 18.

[0049] When the controller receives a signal from the first flow sensor, it opens the first valve 20 and the third valve 22, and closes the second valve 21 and the inlet valve 28. The greywater circulates within the first circulation tank 18, the anaerobic tank 2, and the deodorization tank 3 for the first cycle time of anaerobic deodorization. After the first cycle time, the controller closes the first valve 20 and opens the second valve 21. The greywater after the anaerobic deodorization cycle is completed undergoes nitrogen and phosphorus removal circulation. After a set time, the controller opens the inlet valve 28 to begin the next anaerobic deodorization cycle. The first cycle time is calculated using the following formula:

[0050] when hour,

[0051] when hour,

[0052] In the above formula, COD1 represents the COD value of the input grey water, COD0 represents the standard COD value, and water with the standard COD value meets the requirements for farmland irrigation. The standard COD value is obtained according to the "Farmland Irrigation Water Quality Standard" (GB5084-2021). T1 represents the first cycle time, V1 represents the effective volume of anaerobic tank 2 or deodorization tank 3, V2 represents the volume of the third inlet pipe 15, Q1 represents the flow rate detected by the first flow rate sensor, and Q2 represents the flow rate detected by the second flow rate sensor. The effective volume of anaerobic tank 2 is the volume between the lower end of the upper pipe of the first inlet pipe 13 and the bottom of the anaerobic tank 2. The effective volume of deodorization tank 3 is the volume between the lower end of the upper pipe of the second inlet pipe 14 and the bottom of the deodorization tank 3.

[0053] The second circulation system includes a second circulation tank 23, a second circulation pipe 24, a fourth valve 25, a fifth valve 26, and a sixth valve 27. The second circulation tank 23 is located at the right end of the phosphorus removal tank 5. A sixth inlet pipe 29 is installed inside the second circulation tank 23. One end of the sixth inlet pipe 29 is located at the upper end of one side wall of the second circulation tank 23, and the other end is located near the bottom of the second circulation tank 23. The main outlet pipe 12 is located on the side wall of the second circulation tank 23. One end of the second circulation pipe 24 is connected to the lower wall of the second circulation tank 23, and the other end of the second circulation pipe 24 is connected to… A fourth valve 25 is installed at the connection between the second circulation pipe 24 and the second circulation tank 23, and a fifth valve 26 is installed at the connection between the second circulation pipe 24 and the ammonia nitrogen adsorption tank 4. A sixth valve 27 is installed at the connection between the main outlet pipe 12 and the second circulation tank 23. A third flow rate sensor is installed on the side wall of the ammonia nitrogen adsorption tank 4 and is located below the inlet of the fourth outlet pipe. A fourth flow rate sensor is installed on the side wall of the phosphorus removal tank 5 and is located below the inlet of the sixth inlet pipe 29. A second flow rate sensor is installed at the bottom of the second circulation tank 23.

[0054] When the controller receives a signal detected by the second flow sensor, it controls the fourth valve 25 and the fifth valve 26 to open and the sixth valve 27 to close. The grey water undergoes a second cycle of nitrogen and phosphorus removal circulation in the second circulation tank 23, the ammonia nitrogen adsorption tank 4, and the phosphorus removal tank 5. After the second cycle, the controller controls the fourth valve 25 to close and the fifth valve 26 to open, and the grey water flows out from the main outlet pipe 12. The second circulation tank 23 is also equipped with a water pump, which can pump the grey water that has undergone nitrogen and phosphorus removal circulation in the second circulation tank 23 into the main outlet pipe 12 for it to flow out.

[0055] The second cycle time is calculated using the following formula:

[0056] when hour,

[0057] when hour,

[0058] In the above formula, NH1 represents the ammonia nitrogen value in the input grey water, NH0 represents the standard ammonia nitrogen value, TP1 represents the total phosphorus value in the input grey water, TP0 represents the standard total phosphorus value, TN1 represents the total nitrogen value in the input grey water, and TN0 represents the standard total nitrogen value. NH0, TP0, and TN0 are all obtained according to the secondary standard or the first-level B standard of the "Jiangsu Province Rural Domestic Sewage Discharge Water Quality Indicators" (DB32 / 3462-2020). Water with standard ammonia nitrogen, total nitrogen, and total phosphorus values ​​can be directly discharged or reused. Q3 represents the flow rate detected by the third flow rate sensor, Q4 represents the flow rate detected by the fourth flow rate sensor, w1 represents the weight value of ammonia nitrogen, w2 represents the weight value of total phosphorus, w3 represents the weight value of total nitrogen, V3 represents the effective volume of the ammonia nitrogen adsorption tank or phosphorus removal tank, and V4 represents the volume of the sixth inlet pipe.

[0059] The relationship between w1, w2, and w3 satisfies the following equation:

[0060] w1+w2+w3=1;

[0061] |w1-w2|<α;

[0062] |w1-w3|<α;

[0063] |w3-w2|<α;

[0064] α represents a constant, and α takes values ​​from 0.1 to 0.2.

[0065] Example 3

[0066] In December 2023, a farmer in Jiangyan County received greywater with COD, ammonia nitrogen, total nitrogen, and total phosphorus levels of 233.33 mg / L, 191.8 mg / L, 202.5 mg / L, and 43.59 mg / L, respectively. After treatment with the rural greywater resource utilization and nitrogen and phosphorus enrichment and recovery device described in Example 2, and after anaerobic deodorization and circulation, the greywater showed COD, ammonia nitrogen, total nitrogen, and total phosphorus levels of 66.67 mg / L, 99.98 mg / L, 109.5 mg / L, and 33.88 mg / L, respectively. The COD removal rate was >71%, and the greywater used for irrigation met the "Standards for Irrigation Water Quality" (GB 1994.5). The water quality standards for irrigation of peeled vegetables (5084—2021) are met. After nitrogen and phosphorus removal and recycling, the COD, ammonia nitrogen, total nitrogen, and total phosphorus values ​​in the grey water are 53.33 mg / L, 11.14 mg / L, 21.96 mg / L, and 2.34 mg / L, respectively, which meet the Class II standard of Jiangsu Province Rural Domestic Sewage Discharge Water Quality Index (DB32 / 3462-2020). Calculations show that the device provided by this invention has an ammonia nitrogen removal recovery rate of >97%, a total nitrogen removal recovery rate of >79%, and a total phosphorus removal recovery rate of >93% in the grey water.

[0067] Example 4

[0068] In February 2024, a farmer in Jiangyan County received greywater with COD, ammonia nitrogen, total nitrogen, and total phosphorus levels of 110 mg / L, 1.75 mg / L, 33.31 mg / L, and 1.78 mg / L, respectively. After anaerobic deodorization and recycling, the greywater's COD, ammonia nitrogen, total nitrogen, and total phosphorus levels were 23.33 mg / L, 0.28 mg / L, 9.37 mg / L, and 0.72 mg / L, respectively. The COD removal rate was >78%, and the greywater used for irrigation met the "Standards for Irrigation Water Quality" (GB 1999-2000). The water quality standards for irrigation of peeled vegetables (5084—2021) are met; the COD, ammonia nitrogen, total nitrogen, and total phosphorus values ​​in the grey water after nitrogen and phosphorus removal and recycling are 23.33 mg / L, 0.11 mg / L, 7.02 mg / L, and 0.21 mg / L, respectively, which meet the Class A standard of Jiangsu Province Rural Domestic Sewage Discharge Water Quality Index (DB32 / 3462-2020); the ammonia nitrogen removal recovery rate of the device of this invention is calculated to be >93%, the total nitrogen removal recovery rate is >71%, and the total phosphorus removal recovery rate is >88%.

[0069] Example 5

[0070] In March 2024, a farmer in Jiangyan County received greywater with COD, ammonia nitrogen, total nitrogen, and total phosphorus levels of 56.67 mg / L, 44.45 mg / L, 143.70 mg / L, and 3.43 mg / L, respectively. After anaerobic deodorization and recycling, the levels of COD, ammonia nitrogen, total nitrogen, and total phosphorus in the greywater decreased to 16.67 mg / L, 44 mg / L, 113.08 mg / L, and 3 mg / L, respectively. The COD removal rate was greater than 71%, and the greywater used for irrigation met the "Standards for Irrigation Water Quality" (GB 1999-2000). The water quality standards for irrigation of peeled vegetables (5084—2021) are met; the COD, ammonia nitrogen, total nitrogen, and total phosphorus values ​​in the grey water after nitrogen and phosphorus removal and recycling are 16 mg / L, 5.70 mg / L, 11.51 mg / L, and 0.44 mg / L, respectively, which meet the Class A standard of Jiangsu Province Rural Domestic Sewage Discharge Water Quality Index (DB32 / 3462-2020); the ammonia nitrogen removal recovery rate of the device of this invention is calculated to be >87%, the total nitrogen removal recovery rate is >92%, and the total phosphorus removal recovery rate is >87%.

[0071] This invention calculates the first cycle time based on the COD value of the input greywater and the standard COD value, and calculates the second cycle time based on the ammonia nitrogen value, total nitrogen value, and total phosphorus value and the standard ammonia nitrogen value, standard total nitrogen value, and standard total phosphorus value. The controller controls the first cycle system to perform anaerobic deodorization circulation of greywater in the first cycle tank 18, anaerobic tank 2, and deodorization tank 3 for the first cycle time. The controller controls the second cycle system to perform nitrogen and phosphorus removal circulation of greywater in the second cycle tank 23, ammonia nitrogen adsorption tank 4, and phosphorus removal tank 5 for the second cycle time. The two cycle times of greywater containing different COD values, ammonia nitrogen values, total phosphorus values, and total nitrogen values ​​are different, which can ensure both greywater treatment efficiency and treatment effect. At the same time, the COD removal rate of this invention is above 71%, the ammonia nitrogen removal recovery rate is above 87%, the total nitrogen removal recovery rate is above 71%, and the total phosphorus removal recovery rate is above 87%, which improves the treatment efficiency and utilization efficiency of greywater, and the treated greywater can be fully utilized.

[0072] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A device for the resource utilization and nitrogen and phosphorus enrichment and recovery of rural greywater, characterized in that, The system includes a purification tank, a first circulation system, a second circulation system, and a controller. The purification tank includes an anaerobic tank, a deodorization tank, an ammonia nitrogen adsorption tank, and a phosphorus removal tank. The first circulation system is located between the deodorization tank and the ammonia nitrogen adsorption tank. The second circulation system is located at the end of the phosphorus removal tank away from the ammonia nitrogen adsorption tank. The first circulation system and the second circulation system are electrically connected to the controller. The controller includes a calculation module for calculating the first circulation time and the second circulation time. The controller controls the first circulation system, so that the grey water undergoes anaerobic deodorization circulation for a first circulation time in the first circulation system, the anaerobic tank and the deodorization tank; The controller controls the second circulation system, so that the grey water undergoes a second circulation time of nitrogen and phosphorus removal circulation in the second circulation system, the ammonia nitrogen adsorption tank and the phosphorus removal tank; The first circulation system includes a first circulation tank and a first circulation pipe. The first circulation tank is located between the deodorization tank and the ammonia nitrogen adsorption tank. A main inlet pipe is connected to the side wall of the anaerobic tank. One end of the first circulation pipe is connected to the bottom of the first circulation tank, and the other end of the first circulation pipe is connected to the main inlet pipe. A first valve is provided at the connection between the first circulation pipe and the first circulation tank, and a third valve is provided at the connection between the first circulation pipe and the main inlet pipe. The first circulation tank and the ammonia nitrogen adsorption tank are connected. A second valve is provided at the connection between the first circulation tank and the ammonia nitrogen adsorption tank. A first flow sensor is provided at the bottom of the first circulation tank. An inlet valve is connected in series on the main inlet pipe. When the controller receives a signal detected by the first flow sensor, the controller controls the first valve and the third valve to open, and the controller controls the second valve and the inlet valve to close. The grey water undergoes anaerobic deodorization circulation in the first circulation tank, the anaerobic tank, and the deodorization tank for a first circulation time. A first flow velocity sensor is installed on the inner wall of the anaerobic tank, and a second flow velocity sensor is installed on the inner wall of the deodorization tank. The first circulation tank and the deodorization tank are connected through a third inlet pipe. The first circulation time is calculated using the following formula: when hour, ; when hour, ; In the above formula, This indicates the COD value in the input grey water. Indicates the standard COD value; Indicates the time of the first loop. This indicates the effective volume of the anaerobic tank or deodorization tank. This indicates the volume of the third inlet pipe. This indicates the flow rate detected by the first flow velocity sensor. This indicates the flow rate detected by the second flow velocity sensor; The second circulation system includes a second circulation tank and a second circulation pipe. The second circulation tank is located at the end of the phosphorus removal tank away from the ammonia nitrogen adsorption tank. One end of the second circulation pipe is connected to the bottom of the second circulation tank, and the other end of the second circulation pipe is connected to the bottom of the ammonia nitrogen adsorption tank. A fourth valve is provided at the connection between the second circulation pipe and the second circulation tank, and a fifth valve is provided at the connection between the second circulation pipe and the ammonia nitrogen adsorption tank. A second flow sensor is provided at the bottom of the second circulation tank. When the controller receives the detection signal from the second flow sensor, the controller controls the fourth and fifth valves to open, and the grey water undergoes a second circulation time for nitrogen and phosphorus removal within the second circulation tank, the ammonia nitrogen adsorption tank, and the phosphorus removal tank.

2. The rural greywater resource utilization and nitrogen and phosphorus enrichment and recovery device according to claim 1, characterized in that, The anaerobic tank contains a first packing material, the deodorization tank contains a second packing material, the ammonia nitrogen adsorption tank contains a third packing material, and the phosphorus removal tank contains a fourth packing material; the first packing material includes spherical biological packing material and powdered fermentation agent, the second packing material is volcanic rock, the third packing material is natural zeolite, and the fourth packing material includes ore and phosphorus removal agent.

3. The rural greywater resource utilization and nitrogen and phosphorus enrichment and recovery device according to claim 2, characterized in that, The spherical biological packing material has a shell, which is a hollow structure. The shell is made of polypropylene and filled with polyurethane. The fermentation agent includes acid-resistant Lactobacillus and Ralstonia pinnili, with the abundance of acid-resistant Lactobacillus greater than 80%.

4. The rural greywater resource utilization and nitrogen and phosphorus enrichment and recovery device according to claim 2, characterized in that, The deodorization tank, the ammonia nitrogen adsorption tank, and the phosphorus removal tank are all equipped with support plates, and the second packing material, the third packing material, and the fourth packing material are all installed on the support plates.

5. A rural greywater resource utilization and nitrogen and phosphorus enrichment and recovery device according to claim 2, characterized in that, The first packing material accounts for 80% of the effective volume of the anaerobic tank, the second packing material accounts for 60% of the effective volume of the deodorization tank, the third packing material accounts for 80% of the effective volume of the ammonia nitrogen adsorption tank, and the fourth packing material accounts for 80% of the effective volume of the phosphorus removal tank.

6. The rural greywater resource utilization and nitrogen and phosphorus enrichment and recovery device according to claim 1, characterized in that, A third flow rate sensor is installed on the inner wall of the ammonia nitrogen adsorption tank, and a fourth flow rate sensor is installed on the inner wall of the phosphorus removal tank. The second circulation tank is connected to the phosphorus removal tank through a sixth inlet pipe. The second circulation time is calculated using the following formula: when hour, ; when hour, ; In the above formula, This indicates the ammonia nitrogen value in the input grey water. Indicates the standard ammonia nitrogen value. This indicates the total phosphorus value in the input grey water. Indicates the standard total phosphorus value. This indicates the total nitrogen value in the input grey water. Indicates the standard total nitrogen value; This indicates the flow rate detected by the third flow velocity sensor. This indicates the flow rate detected by the fourth flow velocity sensor. This indicates the weighting value of ammonia nitrogen. This represents the weighted value of total phosphorus. The weighted value representing total nitrogen. This indicates the effective volume of the ammonia nitrogen adsorption tank or phosphorus removal tank. This indicates the volume of the sixth inlet pipe.

7. A rural greywater resource utilization and nitrogen and phosphorus enrichment and recovery device according to claim 6, characterized in that, , , The relationship satisfies the following equation: ； ； ； ； Represents a constant. Take a value of 0.1-0.2.

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