Device for cooperatively treating excess sludge based on radio frequency heating and alkali

Abstract

The utility model discloses a device for cooperatively treating excess sludge based on radio frequency heating and alkali, belongs to the technical field of sewage sludge treatment, and solves the problems of high medicine consumption and high energy consumption in the process of independently combining an alkali treatment process and a radio frequency heating technology in the conventional AO (Anaerobic Oxidation) process. The system comprises an AO system, wherein the AO system comprises an anoxic tank, an aerobic tank and a sedimentation tank which are communicated in sequence; a sludge outlet of the sedimentation tank is respectively communicated with a sludge discharge pipe, a sludge return pipe and an alkali liquor sludge return pipe, the sludge return pipe is communicated with the anoxic tank, the alkali liquor sludge return pipe is communicated with a water inlet of the radio frequency heating tank, and a water outlet of the radio frequency heating tank is communicated with a water inlet pipe through a disintegrated sludge return pipe. According to the device, an alkali treatment process and a radio frequency heating technology are coupled for in-situ recycling of sludge through the alkali liquor sludge return pipe and the radio frequency heating tank, the alkali chemical consumption and the radio frequency energy consumption are reduced through the cooperation of the alkali treatment process and the radio frequency heating technology, and the influence of overhigh pH on the nitrogen and phosphorus removal efficiency of the AO system is avoided due to the reduction of the alkali consumption.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage sludge treatment technical field, concretely relates to a device of residual sludge based on radio frequency heating and alkali synergic treatment. BACKGROUND

[0002] In the sewage sludge treatment technical field, AO (Anoxic-Oxic) process is a common biological denitrification process, through the alternate operation of anoxic (Anoxic) and aerobic (Oxic) environment, utilizes the synergistic effect of denitrifying bacteria and nitrifying bacteria to remove organic matter and nitrogen in sewage. Its core is to complete denitrification by the internal reflux of nitrification liquid to the anoxic zone, and it is widely used in urban sewage and industrial wastewater treatment, but there are problems of large external carbon source consumption and large residual sludge.

[0003] In order to solve the above problems, the existing AO process often needs to be combined with other processes to improve performance. For example, the alkali treatment process and the radio frequency heating technology in the prior art, wherein the alkali treatment is one of the common residual sludge breaking techniques, which promotes the release of organic matter and reduces the external carbon source. However, in the alkali treatment process, not only the drug consumption is high, but also the high pH will affect the denitrification and phosphorus removal efficiency of the biochemical system. The radio frequency heating technology generates heat by inducing ion rapid vibration, friction and collision through high-frequency electromagnetic field, which destroys the cell structure and extracellular polymeric substance of sludge and promotes the release of organic matter. However, the radio frequency heating technology has the problem of high energy consumption.

[0004] In summary, the existing AO process has the problems of high drug consumption and high energy consumption when combined with the alkali treatment process and the radio frequency heating technology respectively. UTILITY MODEL CONTENT

[0005] In view of the above problems in the prior art, the utility model provides a device of residual sludge based on radio frequency heating and alkali synergic treatment, which solves the problems of high drug consumption and high energy consumption of the existing AO process when combined with the alkali treatment process and the radio frequency heating technology respectively.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A device of residual sludge based on radio frequency heating and alkali synergic treatment is provided, which comprises an AO system, the AO system comprises an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially communicated; the water inlet of the anoxic tank is communicated with a water inlet pipe; the aerobic tank is communicated with the anoxic tank through a nitrification liquid reflux pipe; the water outlet of the sedimentation tank is communicated with a water outlet pipe, the sludge discharge port of the sedimentation tank is respectively communicated with a sludge discharge pipe, a sludge reflux pipe and an alkali liquid sludge reflux pipe for providing an alkali environment, the sludge reflux pipe is communicated with the anoxic tank, the alkali liquid sludge reflux pipe is communicated with the water inlet of a radio frequency heating tank, and the water outlet of the radio frequency heating tank is communicated with the water inlet pipe through a broken sludge reflux pipe.

[0008] In the scheme, the AO system is communicated with the radio frequency heating pool through the alkali sludge reflux pipe to realize the synergistic effect of radio frequency heating and alkali treatment, and to reduce the drug consumption and energy consumption in the sewage sludge treatment process. Specifically, the alkali in the alkali sludge reflux pipe can not only break the sludge, but also improve the conductivity of the sludge by breaking the ions, optimize the heating efficiency of the radio frequency, promote the radio frequency heating temperature, and reduce the radio frequency energy consumption. At the same time, the higher temperature can accelerate the reaction rate of alkali and sludge, reduce the drug consumption, and avoid the phenomenon of unstable treatment effect caused by too high pH.

[0009] Further, the alkali sludge reflux pipe includes a pipe body, and an alkali inlet communicated with the alkali tank is arranged on the pipe body. The alkali is directly added through the pipe body to realize the rapid mixing of the alkali and the sludge, avoid the energy consumption of the additional stirring equipment in the traditional alkali treatment process, and accurately control the alkali addition amount to reduce the drug waste.

[0010] Further, the alkali sludge reflux pipe includes a pipe body, and the pipe body is communicated with the radio frequency heating pool through the pH adjusting pool. The sludge is pre-adjusted through the pH adjusting pool to ensure that the sludge entering the radio frequency heating pool is in the best pH range.

[0011] Further, the pH of the pH adjusting pool is 9.5-10.5. The radio frequency heating technology refers to the friction and collision between ions and molecules caused by the continuous and rapid rotation and oscillation of ions in a high-frequency electromagnetic field. The mechanism of radio frequency enhanced sludge dissolution and cracking includes thermal effect and non-thermal effect. The thermal effect refers to the heat transfer to the cells in the remaining sludge, which causes cell swelling, cracking and organic matter dissolution. The non-thermal effect promotes sludge dissolution mainly through two steps, i.e. breaking the binding force between EPS and cells, and then producing irreversible electro-osmosis on the cells to promote direct rupture of the cells and direct outflow of the cell contents. The radio frequency heating pool couples the radio frequency heating technology and the alkali treatment. When the sludge is exposed to an alkaline environment, the radio frequency heating treatment promotes cell fragmentation and organic matter release. Moreover, the ions dissociated by alkali can promote the radio frequency heating temperature. In addition, a higher temperature can accelerate the chemical reaction rate, i.e. the reaction rate of alkali and sludge. However, excessive ions may have an adverse effect on the friction and collision efficiency between ions and molecules, so the pH of the pH adjusting pool is controlled to be 9.50-10.50 to reduce the amount of alkali, and to avoid the problem of too high pH of the broken sludge.

[0012] Further, the radio frequency heating pool includes a pool body communicated with the water inlet pipe and the alkali sludge reflux pipe, and two radio frequency electrode plates electrically connected with the radio frequency generator are symmetrically and parallelly installed on the upper and lower sides of the pool body. The symmetrically parallel radio frequency plate design makes the electromagnetic field distribution more uniform, and improves the radio frequency energy utilization rate.

[0013] Further, a waterproof temperature sensor is arranged in the alkali sludge reflux pipe near the radio frequency heating pool, the temperature sensor is signal connected with the controller, and the controller is in communication connection with the radio frequency generator.

[0014] Further, the temperature in the radio frequency heating pool is 70-80 DEG C.

[0015] Further, a check valve is arranged on the broken sludge reflux pipe.

[0016] Further, the ratio of the flow of the broken sludge reflux pipe to the flow of the sludge reflux pipe is 10-30%, and the sum of the flow of the broken sludge reflux pipe and the flow of the sludge reflux pipe is equal to the flow of the water inlet pipe.

[0017] Further, the pool body is in a cylindrical structure, and the material of the pool body is polytetrafluoroethylene.

[0018] The utility model discloses a device based on radio frequency heating and alkali collaborative processing residual sludge, and has the beneficial effects that:

[0019] The alkali sludge reflux pipe and the radio frequency heating pool are coupled to be used for in-situ resource of sludge by alkali treatment process and radio frequency heating technology, improve the processing efficiency of AO system, and the radio frequency heating promotes sludge cell disintegration, and the alkali treatment reduces the required heating temperature, and the alkali treatment and the radio frequency heating reduce the alkali consumption and the radio frequency energy consumption, and because the alkali consumption is reduced, the high pH is avoided to influence the denitrification and phosphorus removal efficiency of AO system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the device based on radio frequency heating and alkali collaborative processing residual sludge.

[0021] 1, anoxic tank, 11, water inlet pipe, 2, aerobic tank, 21, nitration liquid reflux pipe, 3, sedimentation tank, 31, water outlet pipe, 32, sludge reflux pipe, 33, sludge discharge pipe, 4, alkali sludge reflux pipe, 41, pipe main body, 42, pH adjusting pool, 5, radio frequency heating pool, 51, pool body, 52, radio frequency electrode plate, 53, radio frequency generator, 54, controller, 6, broken sludge reflux pipe. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application are described below to enable those skilled in the art to understand the present application, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, any changes within the spirit and scope of the present application defined and determined by the appended claims are obvious, and all the utility model creations utilizing the concept of the present application are within the scope of protection.

[0023] In view of the problems of high drug consumption and high energy consumption of the AO process in combination with the alkali treatment process and the radio frequency heating technology respectively in the prior art, the present application provides a device for co-treatment of residual sludge based on radio frequency heating and alkali, which communicates the AO system with the radio frequency heating tank 5 through the alkali sludge reflux pipe 4 to realize the synergistic effect of radio frequency heating and alkali treatment, thereby reducing the drug consumption and energy consumption of the sewage sludge treatment process, which will be described in detail below.

[0024] Reference Figure 1 The device for co-treatment of residual sludge based on radio frequency heating and alkali comprises an AO system and a radio frequency heating tank 5.

[0025] The AO system comprises an anoxic tank 1, an aerobic tank 2 and a sedimentation tank 3 connected in sequence. The water inlet of the anoxic tank 1 is communicated with the water inlet pipe 11. The aerobic tank 2 is communicated with the anoxic tank 1 through the nitrification liquid reflux pipe 21. The water outlet of the sedimentation tank 3 is communicated with the water outlet pipe 31, and the sludge discharge port of the sedimentation tank 3 is communicated with the sludge discharge pipe 33, the sludge reflux pipe 32 and the alkali sludge reflux pipe 4 respectively. The sludge reflux pipe 32 is communicated with the anoxic tank 1, and the alkali sludge reflux pipe 4 is used to provide an alkali environment for the sludge.

[0026] The radio frequency heating tank 5 comprises a tank body 51, which is communicated with the water inlet pipe 11 and the alkali sludge reflux pipe 4 respectively. Two radio frequency electrode plates 52, which are electrically connected with a radio frequency generator 53, are symmetrically and parallelly installed on the upper and lower sides of the tank body 51. In this embodiment, the tank body 51 is in a cylindrical structure, and the material of the tank body 51 is polytetrafluoroethylene. The dielectric loss of polytetrafluoroethylene is low, which improves the radio frequency energy utilization rate, and the material characteristics are inert, which can maintain stability in a wide temperature range.

[0027] In this embodiment, the working frequency of the radio frequency generator 53 is 27.12 MHz, and the maximum power is 12000 W. The two radio frequency electrode plates 52 are both aluminum electrode plates, which are respectively the upper electrode plate and the lower electrode plate. The upper electrode plate can be vertically moved on the tank body 51 through a slide rail, so that the distance between the upper electrode plate and the lower electrode plate can be freely adjusted within the range of 10 cm to 20 cm, and the radio frequency output power can be changed by adjusting the distance.

[0028] As a scheme of the lye sludge backflow pipe 4 of the embodiment, the lye sludge backflow pipe 4 comprises a pipe body 41, and the pipe body 41 is provided with a lye opening in communication with a lye tank. The lye is directly added through the pipe body 41 to realize rapid mixing of the alkali agent and the sludge, avoid the energy consumption of the additional stirring equipment in the traditional alkali treatment process, accurately control the alkali addition amount, and reduce the reagent waste.

[0029] As another scheme of the lye sludge backflow pipe 4 of the embodiment, the lye sludge backflow pipe 4 comprises a pipe body 41, and the pipe body 41 is in communication with a radio frequency heating tank 5 through a pH adjusting tank 42. The pH of the pH adjusting tank 42 is 9.5-10.5. The sludge is pre-adjusted through the pH adjusting tank to ensure that the sludge entering the radio frequency heating tank 5 is in the optimal pH range. The pH adjusting tank is a prior art, and thus the specific working principle and connection relationship thereof will not be described herein.

[0030] The reason for setting the pH to 9.5-10.5 is that the mechanism of the radio frequency heating for enhancing sludge dissolution and lysis includes thermal effect and non-thermal effect. The thermal effect refers to the heat transfer to the cells in the residual sludge, which causes the cells to swell, lysis and organic matter dissolution. The non-thermal effect mainly promotes sludge dissolution through two steps, i.e., breaking the binding force between EPS and cells, and then producing irreversible electro-osmosis on the cells to promote the direct rupture of the cells and the direct outflow of the cell contents. The radio frequency heating tank 5 couples the radio frequency heating technology and the alkali treatment. When the sludge is exposed to an alkaline environment, the radio frequency heating treatment promotes cell fragmentation and organic matter release, and the ions dissociated by the alkali can promote the radio frequency heating to rise in temperature. In addition, a higher temperature can accelerate the chemical reaction rate, i.e., the reaction rate of the alkali and the sludge. However, excessive ions can adversely affect the friction and collision efficiency between ions and molecules, and thus the pH of the pH adjusting tank is controlled to 9.50-10.50 to reduce the amount of alkali used and avoid the problem of too high pH of the lysis sludge.

[0031] In order to avoid the pollution of the untreated sludge to the lysis material and ensure the stability of the system operation, the outlet of the tank body 51 in the radio frequency heating tank 5 is in communication with the inlet pipe 11 through a lysis sludge backflow pipe 6. The lysis sludge backflow pipe 6 is provided with a check valve.

[0032] In order to facilitate the control of the temperature of the radio frequency heating tank 5, a waterproof temperature sensor is arranged in the lye sludge backflow pipe 4 close to the radio frequency heating tank 5. The temperature sensor is in wireless signal connection with a controller 54, and the controller 54 is in communication connection with a radio frequency generator 53. The closed-loop temperature control system adjusts the radio frequency power in real time through real-time monitoring. In the embodiment, the temperature sensor is a wireless waterproof temperature sensor with a built-in battery, and the controller 54 is a single-chip microcomputer or a PLC. Preferably, the temperature in the radio frequency heating tank 5 is 70-80℃.

[0033] As a further scheme of the embodiment, the ratio of the flow rate of the sludge disintegration return pipe 6 to the flow rate of the sludge return pipe 32 is 10% to 30%, and the sum of the flow rates of the sludge disintegration return pipe 6 and the sludge return pipe 32 is equal to the flow rate of the influent pipe 11. By limiting the sludge disintegration return ratio, it is ensured that the disintegrated carbon source returned can meet the nitrogen removal demand, and excessive carbon source does not cause insufficient dissolved oxygen in the aerobic tank 2, thereby maintaining the nitrogen removal efficiency of the AO system.

[0034] In summary, the beneficial effects of the present scheme are:

[0035] The AO system is connected with the radio frequency heating tank 5 through the alkali sludge return pipe 4, so that the alkali treatment and the radio frequency heating are synergized, and the drug consumption and energy consumption in the sewage sludge treatment process are reduced. Specifically, the alkali in the alkali sludge return pipe 4 can not only disintegrate the sludge, but also improve the conductivity of the sludge by disintegrating ions, thereby optimizing the heating efficiency of the radio frequency, promoting the radio frequency heating to rise in temperature, and reducing the radio frequency energy consumption. Meanwhile, the high temperature can accelerate the reaction rate of the alkali and the sludge, reduce the drug consumption, and avoid the phenomenon of unstable treatment effect caused by excessively high pH.

[0036] Although the specific embodiments of the utility model are described in detail in combination with the drawings, it should not be understood as limiting the protection scope of the patent. Various modifications and changes made by those skilled in the art within the scope described in the claims are still within the protection scope of the patent.

Claims

1. An apparatus for co-treatment of excess sludge based on radio frequency heating and alkali, characterized in that, The application relates to an AO system, which comprises an anoxic tank (1), an aerobic tank (2) and a sedimentation tank (3) connected in sequence. The water inlet of the anoxic tank (1) is communicated with a water inlet pipe (11). The aerobic tank (2) is communicated with the anoxic tank (1) through a nitrification liquid reflux pipe (21). The water outlet of the sedimentation tank (3) is communicated with a water outlet pipe (31), the sludge discharge port of the sedimentation tank (3) is respectively communicated with a sludge discharge pipe (33), a sludge reflux pipe (32) and an alkali liquid sludge reflux pipe (4) for providing an alkali environment, the sludge reflux pipe (32) is communicated with the anoxic tank (1), the alkali liquid sludge reflux pipe (4) is communicated with the water inlet of a radio frequency heating tank (5), and the water outlet of the radio frequency heating tank (5) is communicated with the water inlet pipe (11) through a broken sludge reflux pipe (6).

2. The device for synergistic treatment of excess sludge based on radio frequency heating and alkali according to claim 1, characterized in that, The alkali liquid sludge reflux pipe (4) comprises a pipe main body (41), and an alkali liquid port communicated with an alkali liquid tank is arranged on the pipe main body (41).

3. The device for synergistic treatment of excess sludge based on radio frequency heating and alkali according to claim 1, characterized in that, The alkali liquid sludge reflux pipe (4) comprises a pipe main body (41), and the pipe main body (41) is communicated with the radio frequency heating tank (5) through a pH adjusting tank (42).

4. The device for synergistic treatment of excess sludge based on radio frequency heating and alkali according to claim 3, characterized in that, The pH of the pH adjusting tank (42) is 9.5-10.

5.

5. The device for synergistic treatment of excess sludge based on radio frequency heating and alkali according to claim 1, characterized in that, The radio frequency heating tank (5) comprises a tank body (51) communicated with the water inlet pipe (11) and the alkali liquid sludge reflux pipe (4), respectively, and two radio frequency electrode plates (52) electrically connected with a radio frequency generator (53) are symmetrically and parallelly arranged on the upper and lower sides of the tank body (51).

6. The device for synergistic treatment of excess sludge based on radio frequency heating and alkali according to claim 5, characterized in that, A waterproof temperature sensor is arranged in the alkali liquid sludge reflux pipe (4) close to the radio frequency heating tank (5), the temperature sensor is signal-connected with a controller (54), and the controller (54) is communication-connected with the radio frequency generator (53).

7. The device for synergistic treatment of excess sludge based on radio frequency heating and alkali according to claim 5, characterized in that, The temperature in the radio frequency heating tank (5) is 70-80 DEG C.

8. The device for synergistic treatment of excess sludge based on radio frequency heating and alkali according to claim 1, characterized in that, A check valve is arranged on the broken sludge reflux pipe (6).

9. The device for synergistic treatment of excess sludge based on radio frequency heating and alkali according to claim 1, characterized in that, The ratio of the flow of the broken sludge reflux pipe (6) to the flow of the sludge reflux pipe (32) is 10%-30%, and the sum of the flow of the broken sludge reflux pipe (6) and the flow of the sludge reflux pipe (32) is equal to the flow of the water inlet pipe (11).

10. The device for synergistic treatment of excess sludge based on radio frequency heating and alkali according to claim 5, characterized in that, The tank body (51) is in a cylindrical structure, and the material of the tank body (51) is polytetrafluoroethylene.

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