Rural non-point source sewage treatment system and treatment process

Abstract

The present application aims at solving the problems of large land occupation and unstable effluent quality of the prior art which only uses oxidation pond for rural non-point source sewage treatment, and discloses a rural non-point source sewage treatment system and treatment process. The present application realizes real-time monitoring of ammonia nitrogen, total nitrogen and total phosphorus of the oxidation pond through the control system, monitoring unit, lifting unit, integrated treatment equipment and dosing device, and performs water treatment compensation according to the monitoring signal, so as to prevent the oxidation pond treatment load from exceeding the upper limit due to the fluctuation of the water inflow. When the lifting unit is in action, it causes water surface oscillation, which can increase the oxygen content of the water body, thereby ensuring the metabolic stability of the microorganisms in the oxidation pond and the effluent quality. The present application also removes ammonia nitrogen, total phosphorus and total nitrogen during the intensification of the effluent through the biological filter, thereby increasing the treatment efficiency of the oxidation pond. Through water treatment compensation and the biological filter, the same amount of sewage can be treated, and the land occupation of the oxidation pond can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rural sewage treatment, and in particular to a rural non-point source sewage treatment system and treatment process. BACKGROUND

[0002] Rural non-point source pollution refers to pollution caused by dissolved or solid pollutants such as nitrogen, phosphorus, pesticides, heavy metals, household garbage, and rural livestock manure in agricultural production and rural life, which enters the receiving water body through farmland surface runoff, farmland drainage, and underground seepage, etc.

[0003] In the prior art, rural non-point source pollution is mainly treated by an oxidation pond. Nitrogen and phosphorus pollutants in sewage are removed by oxidation pond water self-purification and microbial community absorption in the oxidation pond, and some non-dissolved solids are settled. However, the oxidation pond requires a very large area, and the effluent quality of the oxidation pond is unstable. The main factor causing the instability is that the inflow of rural non-point source sewage into the oxidation pond fluctuates greatly, which on the one hand exceeds the treatment load of the existing oxidation pond, and on the other hand destroys the stability of the microbial community in the original oxidation pond, thereby causing the instability of the effluent quality. SUMMARY

[0004] The present application provides a rural non-point source sewage treatment system and treatment process to significantly reduce the land area of the oxidation pond when treating the same amount of sewage by oxidation pond, and the effluent quality is more stable and the water treatment process is more intelligent compared to single oxidation pond water treatment.

[0005] The technical solution adopted by the present application to solve the above technical problems is as follows:

[0006] A rural non-point source sewage treatment system comprises:

[0007] An oxidation pond is connected to a non-point source pollution water source on one side and a receiving water body on the other side, and is configured to biodegrade the non-point source pollution water source;

[0008] A monitoring unit is arranged at the effluent end of the oxidation pond and is configured to monitor the effluent quality in the oxidation pond in real time;

[0009] An integrated treatment device is connected to the oxidation pond at the water inlet end and is configured to assist the oxidation pond in water treatment;

[0010] A lifting unit is arranged between the integrated treatment device and the oxidation pond, and the lifting unit is configured to receive signals from the monitoring unit and extract sewage from the oxidation pond into the integrated treatment device;

[0011] A dosing device for dosing reagents into corresponding treatment tanks in the integrated treatment equipment;

[0012] A control system connected in signal with the lifting unit, the dosing device, the monitoring unit and the integrated treatment equipment;

[0013] The side of the oxidation pond in communication with the receiving water body is further provided with a biological filter and aquatic plants.

[0014] Further, the oxidation pond and the integrated treatment equipment are built in a three-dimensional architecture, the integrated treatment equipment is arranged above the space of the oxidation pond, and the biological filter and the aquatic plants are integrated at the water outlet side of the oxidation pond.

[0015] Further, the oxidation pond and the integrated treatment equipment are built in a flat architecture, the integrated treatment equipment is arranged on one side of the ground, and the biological filter and the aquatic plants are arranged on the ground between the oxidation pond and the receiving water body.

[0016] Further, the integrated treatment equipment comprises a denitrification tank, a phosphorus removal tank and a carbon filter tank.

[0017] Further, the lifting unit is at least one lifting water pump.

[0018] Further, the dosing device comprises denitrification reagents and phosphorus removal reagents.

[0019] Further, a sludge tank is further included, which is in communication with the phosphorus removal tank through a sludge discharge pipe.

[0020] Further, the biological filter is filled with biological filter material, and the aquatic plants are arranged on the upper layer of the biological filter material.

[0021] A rural non-point source pollution sewage treatment process, comprising the following steps:

[0022] S1: rural non-point source sewage is fed into the oxidation pond;

[0023] S2: the monitoring unit monitors the effluent quality of the oxidation pond in real time;

[0024] S3: if the monitoring result in S2 meets the standard, it is discharged to the receiving water body;

[0025] S4: if the monitoring result in S2 does not meet the standard, the monitoring unit sends an action signal to the lifting unit, the dosing device and the integrated treatment equipment;

[0026] S5: after the action in S4, the lifting unit acts;

[0027] S6: after the action in S5, the dosing device acts;

[0028] S7: After the action of S6, the integrated treatment equipment acts;

[0029] S8: After the action of S7, the sewage treated by the integrated treatment equipment is returned to the oxidation pond, and the water in the oxidation pond is discharged to the receiving water body.

[0030] The beneficial effects of the present application are as follows:

[0031] 1) Compared with the prior art of treating rural water pollution only by the oxidation pond, the present application can significantly reduce the land area of the oxidation pond project; the integrated treatment equipment and the monitoring unit in the present application can monitor the ammonia nitrogen, total phosphorus and total nitrogen indicators of the oxidation pond in real time, and when the treatment load of the oxidation pond is exceeded, the integrated equipment compensates for water treatment, thereby reducing the treatment load of the oxidation pond; a biological filter is also provided at the outlet end of the oxidation pond, and the increased biological filter and aquatic plants can improve the efficiency of sewage treatment, reduce the treatment load of the oxidation pond, and the compensation water treatment and the biological filter both improve the treatment efficiency of rural non-point source pollution, thereby reducing the construction area of the oxidation pond under the same environmental and same volume of sewage working conditions.

[0032] 2) Compared with the prior art, large-area oxidation pond sewage treatment projects are difficult to site and have strict site selection requirements. The sewage treatment system and process provided by the present application can improve the convenience of oxidation pond site selection. Based on the technical effect in 1), it is more convenient to site the reduced area oxidation pond at the rural non-point source sewage, and the possibility of geographical limitation is smaller. Moreover, the construction of the sewage treatment system of the present application can be built in a three-dimensional structure or a flat structure according to the geographical features of the rural site, and the three-dimensional structure is the best for building the sewage treatment system, that is, a device platform is built above the reduced oxidation pond, and the biological filter and aquatic plants are concentrated at the outlet end of the oxidation pond, that is, the system is built inside and above the reduced oxidation pond, without occupying the area outside the oxidation pond, thereby reducing the project construction land area and the geographical limitation factors.

[0033] 3) Compared with the prior art of treating rural non-point source sewage only by the oxidation pond, the effluent water quality is unstable; the sewage treatment system and process of the present application can monitor the ammonia nitrogen, total phosphorus and total nitrogen indicators in the oxidation pond in real time under the real-time monitoring of the monitoring unit, and when the indicators exceed the standard, water treatment compensation is performed, that is, the oxidation pond sewage is extracted by the lifting unit to the integrated treatment equipment for intensive treatment, and the nitrogen removal tank, phosphorus removal tank and carbon filter tank are used for three-stage intensive treatment by corresponding dosing, to intensively remove ammonia nitrogen, total phosphorus, total nitrogen and heavy metals and other pollutants in the sewage until the water quality meets the standard, thereby ensuring that the indicators in the oxidation pond do not exceed the standard and the treatment load of the oxidation pond does not exceed the upper limit.

[0034] Meanwhile, the operation of pumps and other lifting units causes high-speed flow and oscillation of the water in the oxidation pond, thereby increasing the contact area between water and air and increasing the oxygen content in the oxidation pond. Stable oxygen content ensures the metabolic stability of the microbial community within the oxidation pond. In summary, compared to existing oxidation ponds, the oxidation pond in this invention's wastewater treatment system exhibits more stable microbial community metabolism and a more stable self-purification capacity. It can compensate for exceeding its self-purification load through water treatment, and a biological filter is installed at the effluent end for enhanced treatment, resulting in more stable final effluent quality.

[0035] 4) Compared with the existing technology, the wastewater treatment system of the present invention is more intelligent; the integrated treatment equipment is equipped with a control system, which can monitor the equipment operation status in real time, keep track of the water quality of the oxidation pond at any time, and adjust the equipment operation status through remote monitoring. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the system structure of Embodiment 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of the system structure of Embodiment 2 of the present invention.

[0038] The system includes: 1. Oxidation pond; 2. Receiving water body; 3. Monitoring unit; 4. Integrated treatment equipment; 41. Denitrification pond; 42. Phosphorus removal pond; 43. Carbon filter; 44. Sludge pond; 5. Dosing device; 51. Denitrification agent; 52. Phosphorus removal agent; 6. Lifting unit; 7. Biological filter; 8. Aquatic plants; 9. Control system. Detailed Implementation

[0039] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0040] The present invention aims to solve the problems of existing technologies that only use oxidation ponds for rural non-point source sewage treatment, which have the problems of large land area and unstable effluent quality.

[0041] Example 1:

[0042] like Figure 1 As shown, this embodiment provides a rural non-point source pollution sewage treatment system based on a three-dimensional architecture, which includes an oxidation pond 1. The oxidation pond 1 is preferably located near the rural non-point source sewage treatment point. One side of the oxidation pond 1 is connected to the non-point source pollutant water source through a water pipe, and the other side is connected to the receiving water body 2 through an outlet pipe. The oxidation pond 1 is configured to carry out biodegradation of the non-point source pollutant water source.

[0043] The monitoring unit 3 is arranged at the end of the oxidation pond 1 (close to the side of the receiving water body 2), configured to monitor whether the effluent water quality in the oxidation pond 1 meets the standard in real time, specifically for monitoring whether the ammonia nitrogen, total nitrogen, total phosphorus and other important parameters in the oxidation pond 1 are compliant (heavy metals, etc., depending on the specific effluent standard); the monitoring unit 3 can be a water quality monitoring instrument or a water quality analysis instrument commercially available in the water treatment field to monitor the indicators in the oxidation pond 1 in real time and upload to the control system 9.

[0044] In some embodiments, the oxidation pond 1 and the integrated treatment device 4 adopt a three-dimensional architecture, that is, the integrated treatment device 4 is arranged above the space of the oxidation pond 1 through a device platform; the inside of the integrated treatment device 4 is provided with three sewage treatment tanks, including a denitrification tank 41, a phosphorus removal tank 42 and a carbon filter tank 43, the water inlet end of the integrated treatment device 4 is connected to the oxidation pond 1 through the lifting unit 6, the lifting unit 6 is configured to receive the signal of the monitoring unit 3 and extract sewage from the oxidation pond 1 to the integrated treatment device 4, the main function of the denitrification tank 41 is to remove nitride (ammonia nitrogen and nitrate nitrogen) in the sewage, the denitrification tank 41 gradually reduces nitrate nitrogen to nitrogen by the action of denitrification agent 51 and microorganisms, thereby removing nitride from the sewage; the main function of the phosphorus removal tank 42 is to remove phosphorus in the sewage, the phosphorus removal tank 42 removes or converts phosphorus in the sewage to insoluble precipitates by the action of phosphorus removal agent 52 and microorganisms, thereby reducing the phosphorus concentration; the main function of the carbon filter tank 43 is to remove organic matter and some trace pollutants in the sewage, the carbon filter tank 43 uses activated carbon and other adsorbent materials to adsorb organic matter and some difficult-to-remove pollutants in the sewage to the surface, thereby improving the purification effect of the water quality; in particular, the sludge tank 44 is further included, the sludge tank 44 is communicated with the phosphorus removal tank 42 through a sludge discharge pipe, the sludge discharge pipe realizes sludge discharge through the setting of a sludge pump under signal control, thereby discharging to the external sludge tank 44.

[0045] It should be noted that the lifting unit 6 such as a lifting pump will cause high-speed flow and oscillation of the water body in the oxidation pond 1 during operation, thereby increasing the contact surface of water and air, increasing the oxygen content in the oxidation pond 1, and the stability of the oxygen content guarantees the metabolic stability of the microbial community in the oxidation pond 1, thereby making the effluent water quality of the present application more stable than the prior art.

[0046] In some embodiments, the dosing device 5 is used to put the agent into the corresponding treatment tank of the integrated treatment device 4, the types of agents put into the dosing device 5 include denitrification agent 51 and phosphorus removal agent 52, the dosing device 5 can be a conventional dosing device 5 in the water treatment field, which is not limited here.

[0047] In some embodiments, the control system 9 is connected to the lifting unit 6, the dosing device 5, the monitoring unit 3, and the integrated processing equipment 4. The control system 9 can be a conventional control system 9 in the fields of water quality monitoring and water treatment, and is not limited thereto.

[0048] This technical solution enables remote control, intelligent monitoring, and water treatment compensation actions of the lifting unit 6, dosing device 5, monitoring unit 3, and integrated treatment equipment 4 under the control system 9.

[0049] In some embodiments, the biofilter 7 and aquatic plants 8 (not shown in Example 1) are integrated on the effluent side of the oxidation pond 1. The biofilter 7 is filled with biomass filter media, and the aquatic plants 8 are arranged on the upper layer of the biomass filter media. The removal of nitrogen and phosphorus from the wastewater is enhanced through the triple action of the biofilm formed on the filter media, the adsorption of the filter media, and the aquatic plants 8 on the upper layer of the filter media, ensuring that the water that finally enters the river can meet the discharge requirements.

[0050] Working principle of the invention:

[0051] The oxidation pond 1 of the present invention has a reduced footprint because it is equipped with a biological filter 7 and an integrated treatment device 4 for water treatment compensation; and the wastewater treatment system is built using a spatial structure, so there is no need to occupy additional area outside the oxidation pond 1.

[0052] Rural non-point source wastewater enters oxidation pond 1, where microorganisms degrade ammonia nitrogen, total phosphorus, and total nitrogen in the wastewater. Under the control system 9, monitoring unit 3 on the effluent end monitors these three indicators in real time (other heavy metal indicators may be configured as needed). If the indicators fail to meet the standards, the control system 9 sends a signal to the lifting unit 6, which then pumps wastewater from oxidation pond 1 to the integrated treatment equipment 4. The dosing device 5 activates, dispensing two types of chemicals into the corresponding treatment tanks: denitrification tank 41, phosphorus removal tank 42, and carbon filter tank 43. These three-stage treatment tanks treat the wastewater... After the removal of ammonia nitrogen, total phosphorus, and total nitrogen, the wastewater is returned to oxidation pond 1, ensuring that the indicators in oxidation pond 1 do not exceed the preset values. This prevents the treatment load of oxidation pond 1 from exceeding the upper limit. The process also causes water oscillation in the pond, which increases the oxygen content and ensures stable microbial metabolism. Before effluent discharge, the wastewater passes through biological filter 7 filled with biomass filter media. The removal of nitrogen and phosphorus from the wastewater is enhanced by the triple action of the biofilm formed on the filter media, the adsorption effect of the filter media, and the aquatic plants 8 on the upper layer of the filter media, ensuring that the water entering the river meets the discharge requirements.

[0053] Example 2

[0054] like Figure 2 As shown, this embodiment provides a rural non-point source pollution sewage treatment system based on a flat architecture. This embodiment is applicable to construction situations where a spatial architecture cannot be built.

[0055] The embodiment is same as that of the embodiment 1, and the difference is that the setting form is different, specifically, the oxidation pond 1 is arranged near the receiving water body 2, the integrated treatment device 4, the dosing device 5, the biological filter 7, the aquatic plant 8, the sludge tank 44 and the monitoring unit 3 are arranged on the ground between the receiving water body 2 and the oxidation pond 1, and the water treatment effect that can be achieved is basically same as that of the embodiment 1.

[0056] Embodiment 3

[0057] The embodiment provides a rural non-point source pollution sewage treatment process, which comprises the following steps:

[0058] S1: the rural non-point source sewage is input into the oxidation pond 1;

[0059] S2: the monitoring unit 3 monitors the effluent water quality of the oxidation pond 1 in real time;

[0060] S3: if the monitoring result in S2 meets the standard, the effluent is discharged into the receiving water body 2;

[0061] S4: if the monitoring result in S2 does not meet the standard, the monitoring unit 3 sends an action signal to the lifting unit 6, the dosing device 5 and the integrated treatment device 4;

[0062] S5: after the action in S4, the lifting unit 6 is actuated;

[0063] S6: after the action in S5, the dosing device 5 is actuated;

[0064] S7: after the action in S6, the integrated treatment device 4 is actuated;

[0065] S8: after the action in S7, the sewage treated by the integrated treatment device 4 is backflowed to the oxidation pond 1, and the water in the oxidation pond 1 is discharged into the receiving water body 2.

[0066] The rural non-point source pollution sewage treatment process provided by the embodiment has higher efficiency than the prior art only through the oxidation pond 1, the effluent water quality is more stable, and the oxidation pond 1 used in construction and application has smaller land occupation.

[0067] The above description is an explanation of the embodiment, not a limitation of the invention, the scope defined by the embodiment is referred to the claims, and any form of modification within the protection scope of the embodiment can be made.

Claims

1. A rural non-point source wastewater treatment system, characterized by: The application relates to a rural non-point source pollution treatment system, which comprises the following parts: an oxidation pond (1) which is connected to a non-point source pollution water source on one side and a receiving water body (2) on the other side, and is configured to biodegrade the non-point source pollution water source; a monitoring unit (3) which is arranged at the water outlet end of the oxidation pond (1) and is configured to monitor the water quality of the water outlet of the oxidation pond (1) in real time; an integrated treatment device (4) which is connected to the oxidation pond (1) at the water inlet end and is configured to assist the oxidation pond (1) in water treatment and is discharged into the oxidation pond (1) at the water outlet end; a lifting unit (6) which is arranged between the integrated treatment device (4) and the oxidation pond (1), and is configured to receive the signal of the monitoring unit (3) and extract sewage from the oxidation pond (1) into the integrated treatment device (4); the lifting unit is configured to cause high-speed flow and oscillation of the water body in the oxidation pond when working; a dosing device (5) which is used for feeding reagents into corresponding treatment pools in the integrated treatment device (4); a control system (9) which is signal-connected to the lifting unit (6), the dosing device (5), the monitoring unit (3) and the integrated treatment device (4); the oxidation pond (1) is further provided with a biological filter (7) and aquatic plants (8) on the side connected to the receiving water body (2); the oxidation pond (1) and the integrated treatment device (4) are built in a three-dimensional structure, the integrated treatment device (4) is arranged above the space of the oxidation pond (1), and the biological filter (7) and the aquatic plants (8) are integrated on the water outlet side of the oxidation pond (1); the integrated treatment device (4) comprises a denitrification pool (41), a dephosphorization pool (42) and a carbon filter pool (43); the dosing device (5) comprises denitrification reagents (51) and dephosphorization reagents (52); a sludge pool (44) which is connected to the dephosphorization pool (42) through a sludge discharge pipe.

2. The rural non-point source sewage treatment system according to claim 1, characterized in that: The lifting unit (6) is at least one lifting water pump.

3. The rural non-point source sewage treatment system according to claim 1, characterized in that: The biological filter (7) is filled with biological filter material, and the upper layer of the biological filter material is arranged with the aquatic plants (8).

4. A rural non-point source sewage treatment process using the rural non-point source sewage treatment system according to any one of claims 1-3, characterized in that: The application further comprises the following steps: S1: rural non-point source sewage is fed into the oxidation pond (1); S2: the monitoring unit (3) monitors the water quality of the water outlet of the oxidation pond (1) in real time; S3: if the monitoring result in S2 is up to standard, the sewage is discharged into the receiving water body (2); S4: if the monitoring result in S2 is not up to standard, the monitoring unit (3) sends an action signal to the lifting unit (6), the dosing device (5) and the integrated treatment device (4); S5: after the action in S4, the lifting unit (6) is actuated; S6: after the action in S5, the dosing device (5) is actuated; S7: after the action in S6, the integrated treatment device (4) is actuated; S8: after the action in S7, the sewage treated by the integrated treatment device (4) is returned to the oxidation pond (1), and the water in the oxidation pond (1) is discharged into the receiving water body (2).

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