Autotrophic denitrification filter tank suitable for desilting tail water

Abstract

An autotrophic denitrification filter tank suitable for desilting tail water comprises a filter tank body structure, and the tank body structure is divided into a clear water area, a filter material layer, a supporting layer and a water distribution area from top to bottom in sequence; a water inlet pipe; a clear water tank; the fan is connected with the air inlet of the filter tank through a pipeline and is used for providing air flow required by backwashing; and the backwashing pump is connected with the backwashing water inlet of the filter tank through a backwashing water inlet pipe. The device is compact and reasonable in structure and convenient to operate, reasonable partition is adopted, meanwhile, elemental sulfur or elemental iron is used as an electron donor in the filter material layer, nitrate nitrogen in tail water is reduced into nitrogen through the physiological metabolism effect of autotrophic denitrifying bacteria, meanwhile, phosphorus removal is assisted through the precipitation reaction of iron ions and phosphate ions, and the nitrogen removal efficiency is improved. The effect of synchronously removing nitrogen and phosphorus is realized. The technology has the advantages of small occupied area, no need of additional carbon sources, high treatment efficiency, convenience in maintenance and the like, and is particularly suitable for treatment of desilting tail water.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sewage treatment, especially an autotrophic denitrification filter suitable for dewatering of dredging tail water. BACKGROUND

[0002] Ecological dredging and sludge disposal, that is, the whole process of cutting, collecting, extracting and transporting sludge in water from the bottom of the water body to a specific place for centralized treatment, is the most important means to eliminate endogenous pollution in the water body and is an important engineering technology in the field of water environment ecological restoration and treatment, which includes sludge concentration, sludge dewatering, and tail water treatment units.

[0003] According to the characteristics of sludge and the characteristics of sludge disposal technology, a sedimentation tank or a sedimentation tank is often used for treatment of tail water after sludge dewatering. However, the sedimentation tank required by large projects has a large volume and occupies a large area, the treatment capacity of the sedimentation tank is limited, the residence time is short, and problems such as unstable effluent quality may occur.

[0004] The main pollutants in the dredging tail water are suspended solids, CODCr, ammonia nitrogen, total phosphorus and total nitrogen. The filter plays a very important role in removing suspended solids and colloidal substances in water, which can effectively reduce the turbidity of water. As long as the water treatment facilities can operate normally, the removal effect of CODCr and total phosphorus is also very good. However, the removal effect of ammonia nitrogen and total nitrogen by conventional water treatment facilities is very low, and a special total nitrogen removal process is needed.

[0005] Heterotrophic denitrification is a process in which heterotrophic microorganisms use organic carbon as an electron donor and nitrate as an electron acceptor to reduce nitrate to nitrogen gas through biological reduction. The disadvantage is that the additional carbon source will bring high operating cost, and in the case of fluctuation of influent water quality, it is easy to cause excessive or insufficient carbon source, and there is a problem of secondary pollution of residual organic matrix and influence on effluent water quality.

[0006] In view of the above problems, while ensuring the effluent water quality, reducing the energy consumption and water treatment cost, and improving the tail water treatment efficiency, the present application provides an autotrophic denitrification filter suitable for dewatering of dredging tail water, which combines the total nitrogen treatment process with the filter, reduces the land occupation of the treatment device, and improves the tail water treatment efficiency of dredging. Utility model content

[0007] In view of the above-mentioned shortcomings in the prior art, the present application provides an autotrophic denitrification filter suitable for dewatering of dredging tail water, which utilizes the physiological metabolism of autotrophic denitrifying bacteria to reduce nitrate nitrogen in the tail water to nitrogen gas, and simultaneously utilizes the precipitation reaction of iron ions and phosphate ions to assist in phosphorus removal, thereby achieving the effect of simultaneous denitrification and phosphorus removal.

[0008] The technical scheme adopted by the utility model is as follows:

[0009] An autotrophic denitrification filter for dewatering tail water, comprising:

[0010] The filter comprises a tank structure, which is divided into a clean water zone, a filter material layer, a supporting layer and a water distribution zone from top to bottom.

[0011] A water inlet pipe connected to the water inlet of the filter for introducing the tail water to be treated.

[0012] A clean water tank connected to the filter through a clean water pipe for storing the treated clean water and serving as a backwashing water tank.

[0013] A fan connected to the air inlet of the filter through a pipeline to provide the airflow required for backwashing.

[0014] A backwashing pump connected to the backwashing water inlet of the filter through a backwashing water inlet pipe to provide the water flow required for backwashing.

[0015] Further, a monitoring and control system is further included to monitor the operating state of the filter and the change of water quality in real time, and to adjust the operating parameters and control the backwashing cycle according to the monitoring results, the monitoring and control system comprising a pressure transmitter connected to the water inlet pipe, a hydraulic switch connected in the clean water tank, a one-way valve connected to the backwashing water inlet pipe, and control valves for controlling the respective pipelines.

[0016] Further, the clean water zone is located at the top of the filter for collecting the treated clean water and flowing out to the clean water tank through a water outlet weir.

[0017] Further, the supporting layer is located below the filter material layer and is composed of large-diameter particles to support the filter material and prevent the loss of the filter material, while ensuring the uniform distribution of the tail water into the filter material layer.

[0018] Further, the filter material layer is the core part of the filter, which is filled with specially designed filter material, and the filter material is uniformly mixed with elemental iron, ferrous iron and elemental sulfur to provide the necessary electron donor for autotrophic denitrifying bacteria and to intercept suspended solids.

[0019] Further, the water distribution zone is used to buffer and uniformize the water flow into the filter to ensure the uniform distribution of the water flow to the supporting layer.

[0020] Further, a liquid level switch is provided in the clean water tank for detecting the change of liquid level.

[0021] Further, a backwashing discharge pipe is further included, one end of which is connected to the backwashing emptying port of the filter and the other end of which is connected to the front-end water inlet tank for discharging the backwashing water.

[0022] Further, an overflow pipe is further included, one end of which is connected to the overflow port of the filter and the other end of which is connected to the front-end water inlet tank to achieve the effect of overflow.

[0023] Further, it also includes a emptying pipe, one end of which is connected with the filter pool emptying port of the filter pool, and the other end is connected with the front end water pool, for emptying the filter pool and cleaning the filter pool.

[0024] The utility model discloses the beneficial effect as follows:

[0025] The utility model discloses compact, reasonable, convenient operation adopts reasonable partition, and with single sulfur or single iron as electron donor in filter material layer, through the physiological metabolism of autotrophic denitrifying bacteria, nitrate nitrogen in tail water is reduced to nitrogen, and the precipitation reaction of iron ion and phosphate ion is utilized to assist phosphorus removal, and the effect of simultaneous denitrification and phosphorus removal is realized. The technology has the advantages of small land occupation, no additional carbon source, high treatment efficiency, convenient maintenance, etc., and is especially suitable for the treatment of dredging tail water.

[0026] Meanwhile, the utility model still has following advantages:

[0027] (1) equipment structure, saves land and can realize scene change

[0028] The autotrophic denitrification filter pool described in the application is a steel tank, which greatly reduces the land occupation required by traditional structures and can realize rapid scene change of equipment with the project, saving one-time investment of temporary engineering.

[0029] (2) no additional organic carbon source is needed

[0030] The denitrification filter pool described in the application reduces nitrate nitrogen to nitrogen through the physiological metabolism of autotrophic denitrifying bacteria, and no additional organic carbon source is needed, which is non-carbon source dependent, and there is no problem of secondary over-standard of effluent COD / BOD.

[0031] (3) good denitrification and phosphorus removal effect

[0032] While realizing denitrification by autotrophic denitrifying bacteria, iron ions can react with phosphate ions in water to form a precipitate, thereby assisting in removing total phosphorus in water. Therefore, the process has the function of simultaneous denitrification and phosphorus removal.

[0033] (4) good rapid filtration efficiency

[0034] The tail water enters from the lower end of the filter pool, flows through the filter material layer from bottom to top, can intercept flocculent bodies rising with the tail water, and the suspended matter in the water is intercepted, so that the stability of effluent SS is ensured, the burden of subsequent water treatment devices is reduced, the subsequent water treatment effect is improved, and the investment of water treatment structures is reduced. When the filter material is blocked and the water flow rate is reduced, backwashing is needed, and the backwashing is performed in the mode of air washing-air and water combined washing-water washing, and the filtration and water discharge process can be accelerated by automatic water force control. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a structural schematic view of the utility model.

[0036] Figure 2 It is a filter structure schematic view in the utility model.

[0037] Among them: 100, filter tank; 200, water inlet pipe; 300, fan; 400, overflow pipe; 500, clean water pipe; 600, clean water tank; 700, backwash discharge pipe; 800, backwash inlet pipe; 900, emptying pipe; 1000, front-end water inlet tank;

[0038] 101, tank structure; 102, water distribution area; 103, support layer; 104, filter material layer; 105, clean water area; 106, filter head; 107, water inlet; 108, air inlet; 109, overflow port; 110, water outlet; 111, backwash emptying port; 112, backwash inlet; 113, filter tank emptying port; 114, water outlet weir;

[0039] 201, pressure transmitter; 601, liquid level switch; 801, check valve; 802, backwash pump. DETAILED DESCRIPTION

[0040] The specific implementation of the utility model will be described below in combination with the drawings.

[0041] As Figures 1-2 shown, the present embodiment discloses a kind of autotrophic denitrification filter tank suitable for dredging tail water, which is suitable for dredging tail water, and the technology aims at realizing efficient, low consumption, environmental dredging tail water treatment by innovative process design, provides new ideas for solving current technical bottleneck.The following is the detailed description of this specific embodiment:

[0042] The autotrophic denitrification filter tank suitable for dredging tail water proposed in the application realizes the effect of simultaneous nitrogen and phosphorus removal by adopting reasonable zoning, using elemental sulfur or elemental iron as electron donor in filter material layer 104, reducing nitrate nitrogen in tail water to nitrogen by physiological metabolism of autotrophic denitrification bacteria, and using precipitation reaction of iron ions and phosphate ions to assist phosphorus removal.The technology has the advantages of small land occupation, no need for additional carbon source, high treatment efficiency, easy maintenance, etc., and is especially suitable for the treatment of dredging tail water.

[0043] As Figure 1 shown, the autotrophic denitrification filter tank in the present embodiment includes filter tank 100, water inlet pipe 200, clean water tank 600, fan 300, backwash pump 802 and other structures and devices such as pipelines and valves.

[0044] The filter tank 100 is the most core component of the whole system, and the filter tank 100 mainly comprises a tank body structure 101, the tank body structure 101 is used for bearing other components and protecting internal equipment, and ensures stability and sealing of the filter tank 100. The inside of the tank body is divided into a clear water area 105, a filter material layer 104, a supporting layer 103 and a water distribution area 102, and each area is separated by a partition plate or a structural member; the steel tank body structure is compact, has small land occupation and reduces construction cost; and automatic control reduces labor input and maintenance cost.

[0045] As shown in the drawings, Figure 2 The filter tank 100 in the embodiment adopts a steel tank body structure 101, is compact in shape, has small land occupation, and is convenient for transportation and installation. The inside of the tank body is divided into the clear water area 105, the filter material layer 104, the supporting layer 103 and the water distribution area 102 from top to bottom.

[0046] The clear water area 105 is located at the top of the filter tank 100, is used for collecting treated clear water, and flows out to the clear water tank 600 through the water outlet weir 114. The clear water tank 600 also functions as a backwashing water tank, stores the required water amount for backwashing, and the tank body structure 100 is provided with an overflow port 109 on the side wall of the upper end of the clear water area 105.

[0047] The overflow port 109 is connected with the overflow pipe 400, and the other end of the overflow pipe 400 is connected with the front-end water inlet tank 1000, so that the overflow effect is realized.

[0048] The supporting layer 103 in the embodiment is located below the filter material layer 104, is composed of large-diameter particles, plays a role of supporting the filter material and preventing the filter material from being lost, and ensures that tail water is uniformly distributed into the filter material layer 104.

[0049] A plurality of filter heads 106 are connected to the supporting layer 103, the plurality of filter heads 106 are on the same horizontal plane, the openings of the filter heads 106 face downward, and the plurality of filter heads 106 adopt long-handle filter heads, so that the filtering effect is improved and larger particles are filtered.

[0050] The filter material layer 104 in the embodiment is the core part of the filter tank 100, is filled with special filter material, and uniformly mixes elementary iron, divalent iron and elementary sulfur in the filter material, so as to provide necessary electron donors for autotrophic denitrifying bacteria and intercept suspended matters. The filter material has small particle diameter, can ensure sufficient specific surface area for bacterial adhesion and growth, and can effectively intercept suspended matters. The filter material layer 104 is located above the supporting layer 103, is formed by natural accumulation, and filter material particles are in contact with each other.

[0051] The water distribution area 102 in this embodiment is used to buffer and uniform the water flow into the filter tank 100, and ensure the uniform distribution of the water flow to the support layer 103. The water distribution area 102 is located at the bottom of the filter tank 100, connected with the external tail water through the water inlet pipe 200, and the water flow is uniformly distributed to the support layer 103 through the water distribution system. The lower end of the side wall of the water distribution area 102 is also provided with a filter tank emptying port 113, which is connected with the emptying pipe 900, and the other end of the emptying pipe 900 is connected with the front-end water inlet tank 1000, which is used for emptying the filter tank 100 and cleaning the filter tank 100.

[0052] As shown in Figure 1 The clean water tank 600 is connected with the filter tank 100 through the clean water pipe 500, and the clean water tank 600 stores clean water. The clean water tank 600 is provided with a liquid level switch 601 to detect the change of the liquid level. The clean water tank 600 is also connected with the filter tank 100 through the backwashing water inlet pipe 800. At this time, the clean water tank 600 acts as a backwashing water tank. The backwashing water inlet pipe 800 is connected with the backwashing water inlet port 112 of the filter tank 100, so as to provide backwashing water to the filter tank 100. The backwashing water inlet pipe 800 is also provided with a backwashing pump 802 and a one-way valve 801.

[0053] Correspondingly, the backwashing emptying port 111 is arranged on the side wall of the filter tank 100 located in the clean water area 105, and the backwashing emptying port 111 is connected with the backwashing discharge pipe 700. The backwashing discharge pipe 700 is connected with the front-end water inlet tank 1000, which is used for discharging the backwashing water.

[0054] The water inlet pipe 200 is connected with the water inlet port 107 of the filter tank 100, and the tail water to be treated is introduced into the filter tank 100. The water inlet pipe 200 is connected with the water distribution area 102, and the tail water is transported to the inside of the filter tank 100.

[0055] The water outlet weir 114 controls the water flow and the water level of the clean water area 105, and ensures the stability of the water quality. The water outlet weir 114 is installed on the edge of the clean water area 105, and is connected with the clean water pipe 500 through the water outlet port 110, so as to discharge the treated clean water from the filter tank 100.

[0056] The backwashing system includes a fan 300 and a backwashing pump 802. The backwashing system is used for periodically backwashing the filter material layer 104, removing impurities and blockages on the filter material, and restoring the filtering performance of the filter tank 100.

[0057] The fan 300 is connected with the air inlet port 108 of the filter tank 100 through a pipeline, and provides air flow required for backwashing. The backwashing pump 802 is connected with the clean water tank 600 through a pipeline, and provides water flow required for backwashing. The backwashing pump 802 is connected with the backwashing water inlet port 112 of the filter tank 100 through the backwashing water inlet pipe 800. During backwashing, the air flow and the water flow act on the filter material layer 104 at the same time, so as to achieve the backwashing effect.

[0058] Meanwhile, the monitoring and control system is also provided in the embodiment to monitor the running state and water quality change of the filter 100 in real time, and to adjust the running parameters and control the backwashing cycle according to the monitoring results. The monitoring data are transmitted to the control system for processing and analysis through sensors, instruments and other devices connected with the inside of the filter 100, including the pressure transmitter 201 connected with the water inlet pipe 200, the hydraulic switch 601 connected with the clean water tank 600, the one-way valve 801 connected with the backwashing water inlet pipe 800, and the control valves for controlling various pipes.

[0059] Inlet and outlet water connection: the tail water enters the distribution zone 102 through the water inlet pipe 200, is treated by the filter material layer 104, is collected in the clean water zone 105, and is discharged to the external pipeline through the water outlet weir 114.

[0060] Air and water combined backwashing connection: during backwashing, the fan 300 sends air flow to the bottom of the filter 100 through the pipeline, and the backwashing pump 802 sends water from the clean water tank 600 to the filter 100 for water flushing. The air flow and the water flow jointly act on the filter material layer 104 to achieve the backwashing effect.

[0061] Monitoring and control connection: the monitoring devices (such as sensors, instruments and the like) are connected with the control system through cables or wireless ways, and the monitoring data are transmitted to the control system in real time for processing and analysis. The control system adjusts the running parameters and controls the backwashing cycle according to the monitoring results.

[0062] In summary, the autotrophic denitrification filter suitable for dredging tail water realizes efficient treatment of tail water through reasonable equipment configuration and structural design. The components are cooperated with each other and are tightly connected to jointly ensure the stable running and high filtration performance of the filter 100.

[0063] The working principle of the embodiment is as follows.

[0064] The dredging tail water enters the filter tank 100 from below through a pipeline, is buffered and adjusted in the distribution area 102, and then enters the large-diameter supporting layer 103 through the long-handled filter head 106. The supporting layer 103 supports the filter material and ensures that the filter material does not enter the distribution area 102, and also plays a role in uniform water distribution. The tail water enters the filter material layer 104 through the supporting layer 103. The filter material contains elemental iron, divalent iron and elemental sulfur. These substances are used as electron donors, and the nitrate nitrogen in the water is used as an electron acceptor. In an anoxic environment, oxidation-reduction reactions occur, converting the nitrate nitrogen in the water into nitrogen gas and achieving denitrification. The filter material layer 104 also contains iron ions, which can react with phosphate ions in the water to precipitate and assist in removing total phosphorus from the water. As a filter tank 100, the filter material layer 104 can trap suspended solids that rise with the tail water, ensuring stable SS in the effluent. Above the filter material layer 104 is the clear water area 105. The treated tail water is transported to the clear water tank 600 through a pipeline via the effluent weir 114. The clear water tank 600 also serves as a backwashing tank. When the filter material becomes clogged, backwashing is performed according to the steps of air washing, air-water combined washing and water washing. First, the fan 300 sends air to the bottom of the filter tank 100 through a pipeline to perform air washing, loosening the clogged material in the filter material layer 104. Then, the backwashing pump 802 is started to pump water from the clear water tank 600 into the filter tank 100, which acts together with the air flow on the filter material layer 104 to perform air-water combined washing and thoroughly clean the filter material. Finally, water washing is performed to ensure that the filter material layer 104 is clean. During backwashing, the backwashing drain 111 is opened, and the backwashing drain pipe 700 discharges the backwashing water to the front-end inlet tank 1000, completing the backwashing process.

[0065] In addition, the monitoring and control system monitors the operating state of the filter tank 100 and changes in water quality in real time. The pressure transmitter 201 monitors changes in the pressure of the inlet pipe 200, the hydraulic switch 601 detects changes in the liquid level of the clear water tank 600, the one-way valve 801 and the backwashing pump 802 control the flow direction and pressure of the backwashing water, and the control valves adjust the pipeline flow. Based on the monitoring results, the control system can automatically adjust operating parameters such as the inlet flow and the backwashing period to ensure that the filter tank 100 is always in the best operating state.

[0066] In practical applications, this technology has shown significant treatment effects. Through the treatment of dredging tail water, this technology not only achieves efficient denitrification and phosphorus removal, but also significantly reduces the suspended solids content in the effluent, improving the water quality. At the same time, due to its small footprint, no need for external carbon source, and easy maintenance, this technology has broad application prospects in practical engineering applications.

[0067] To sum up, the self-sustaining denitrification filter tank suitable for the dewatering tail water disclosed by the embodiment realizes efficient, low-consumption and environmentally-friendly treatment of the dewatering tail water through innovative process design and equipment configuration. The technology not only solves the current technical bottleneck, but also provides a new idea and method for the dewatering tail water treatment. In the future, with the continuous development and improvement of the technology, it is believed that the technology will be widely applied and promoted in more fields.

[0068] The above description is an explanation of the utility model, not a limitation of the utility model, the scope defined by the utility model refers to the claims, within the protection scope of the utility model, any form of modification can be made.

Claims

1. An autotrophic denitrifying filter suitable for use with a dewatered tailwater, characterized in that, Comprise: Its characterized in that, comprising: Filter tank (100), its structure includes tank body structure (101), tank body structure (101) is divided from top to bottom once clear water area (105), filter material layer (104), supporting layer (103) and distribution area (102); Water inlet pipe (200) is connected with the water inlet (107) of filter tank (100), be used for introducing the tail water to be handled; Filter material layer (104) is filled with filter material; Clear water tank (600) is connected with filter tank (100) through clear water pipe (500), is used to store the clear water after processing, and as backwash tank; Fan (300) is connected with the air inlet (108) of filter tank (100) through pipeline, provides the air flow required for backwash; Backwash pump (802) is connected with the backwash inlet (112) of filter tank (100) through backwash inlet pipe (800), provides the water flow required for backwash; Still including emptying pipe (900), one end is connected filter tank (100) filter tank emptying port (113), the other end is connected front inlet pool (1000), is used for emptying filter tank (100) and cleaning filter tank (100); Still including monitoring and control system, real-time monitoring filter tank (100) operating state and water quality change, and according to the monitoring result adjustment operating parameter and control backwash cycle, monitoring and control system includes pressure transmitter (201) connected on water inlet pipe (200), hydraulic switch (601) connected in clear water tank (600), check valve (801) connected on backwash inlet pipe (800), and control valve of control various pipeline.

2. The autotrophic denitrification filter suitable for use with dewatered tailings water of claim 1, wherein, Clear water area (105) is located at the top of filter tank (100), is used to collect the clear water after processing, and flows out to clear water tank (600) through outlet weir (114).

3. The autotrophic denitrification filter for dewatering sludge according to claim 1, wherein Supporting layer (103) is located below filter material layer (104), is composed of large particle size particles, plays the role of supporting filter material, preventing filter material loss, while ensuring that the tail water is evenly distributed into filter material layer (104).

4. The autotrophic denitrification filter for dewatering effluent according to claim 1, characterized in that, Distribution area (102) is used for buffering and uniformity of water flow into filter tank (100), ensure that the water flow is evenly distributed to supporting layer (103).

5. The autotrophic denitrification filter for dewatering effluent according to claim 1, characterized in that, Clear water tank (600) is provided with liquid level switch (601), for detecting liquid level change.

6. The autotrophic denitrification filter for dewatering effluent according to claim 1, wherein Still including backwash discharge pipe (700), one end is connected with the backwash emptying port (111) of filter tank (100), the other end is connected front inlet pool (1000), is used for discharging backwash water.

7. The autotrophic denitrification filter for dewatering effluent according to claim 1, characterized in that, Still including overflow pipe (400), one end is connected with the overflow port (109) of filter tank (100), the other end is connected front inlet pool (1000), realizes the effect of overflow.

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