Sewage and sludge co-treatment device coupling denitrifying phosphorus removal with ultrasonic treatment and alkali treatment

Abstract

The utility model discloses a sewage and sludge co-treatment device coupling denitrifying phosphorus removal with ultrasonic treatment and alkali treatment, belongs to the technical field of sewage and sludge treatment, and solves the problems of high carbon source consumption and high ultrasonic energy consumption of the existing biochemical treatment device. According to the utility model, the alkali activation tank, the ultrasonic A2O treatment system and the denitrification phosphorus removal tank are combined. The sludge activity is increased through the alkali activation tank, and the sludge flows back to the aerobic tank, so that the overall microbial activity of the aerobic tank can be improved, and the alkalinity of the aerobic tank is supplemented; under the action of alkali, the ultrasonic output power in the ultrasonic treatment tank is greatly reduced, and the expansion and rupture of sludge cells are realized under the assistance of low energy density. Meanwhile, the sludge is subjected to low-density ultrasonic activation in the ultrasonic treatment tank and then flows back to enter the denitrifying phosphorus removal tank, and the released carbon source and phosphorus source enable the denitrifying phosphorus removal of the biochemical system to be more sufficient, so that the denitrifying phosphorus removal effect of the whole device is improved, the carbon source is supplemented for the denitrifying phosphorus removal process, and the consumption of the carbon source is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage sludge treatment technical field, concretely relates to the sewage sludge collaborative treatment device of denitrification phosphorus removal coupling ultrasonic and alkali treatment. BACKGROUND

[0002] In the traditional sewage treatment process, biochemical treatment is the key step to remove organic matter (represented by chemical oxygen demand COD), nitrogen and phosphorus and other pollutants in sewage. The traditional denitrification and phosphorus removal sewage treatment process usually includes pretreatment, primary sedimentation, secondary biological treatment (including anaerobic, anoxic and aerobic reaction tank), secondary sedimentation and sludge treatment and other links, wherein external carbon source needs to be added in the anoxic stage to promote the activity of denitrifying bacteria, and effective nitrogen removal is realized. This method not only increases the operation cost, but also consumes a large amount of carbon source.

[0003] In order to solve the above problems, the prior art breaks the wall of the residual sludge by ultrasonic technology, and destroys the extracellular polymeric substance (EPS) to release polysaccharide and protein. For example, the system for sewage treatment and sludge reduction disclosed in the utility model with publication number CN205820996U combines ultrasonic with A2O process to carry out sewage treatment and sludge reduction, so that the sludge EPS is dissolved to provide carbon source and increase the phosphorus removal effect. However, the system has the problem of large ultrasonic energy consumption in the process of hidden growth after ultrasonic cracking. 2 O process to carry out sewage treatment and sludge reduction, so that the sludge EPS is dissolved to provide carbon source and increase the phosphorus removal effect. However, the system has the problem of large ultrasonic energy consumption in the process of hidden growth after ultrasonic cracking. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems in the prior art, the utility model provides a sewage sludge collaborative treatment device for denitrification phosphorus removal coupling ultrasonic and alkali treatment, which solves the problems of large carbon source consumption and large ultrasonic energy consumption of the existing biochemical treatment device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A sewage sludge collaborative treatment device for denitrification phosphorus removal coupling ultrasonic and alkali treatment is provided, which comprises an ultrasonic A 2 O treatment system, the ultrasonic A 2 O treatment system comprises an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank and an ultrasonic treatment tank which are sequentially communicated, and the anaerobic tank and the anoxic tank are communicated with a sewage inlet pipe; wherein the anoxic tank is communicated with the anaerobic tank through a second reflux pipe, and a denitrification phosphorus removal tank is arranged between the anoxic tank and the anaerobic tank; the aerobic tank and the ultrasonic treatment tank are communicated with the denitrification phosphorus removal tank through a third reflux pipe and a fourth reflux pipe respectively, and the sedimentation tank is reflux communicated with the denitrification phosphorus removal tank; an alkali activation tank is arranged between the sedimentation tank and the ultrasonic treatment tank, and the alkali activation tank is communicated with the aerobic tank through a fifth reflux pipe.

[0007] In the scheme, the backflow sludge in the sedimentation tank is passed through the alkali activation tank, the alkali in the alkali activation tank can disperse the flocculation structure in the sludge, stimulate the secretion of extracellular polymeric substance (EPS), improve the sludge dissolved oxygen utilization rate to improve the sludge activity, and at the same time, the existence of alkali greatly reduces the ultrasonic output power in the ultrasonic treatment tank, solves the problem of large ultrasonic energy consumption. At the same time, the sludge in the ultrasonic treatment tank realizes the effects of dissolving extracellular polymeric substance, destroying cell wall, changing extracellular osmotic pressure environment, etc. under the combined action of alkali and ultrasonic waves, realizes cell swelling and rupture, and after treatment, backflow into the denitrifying phosphorus removal tank, supplements carbon source for the denitrifying phosphorus removal process, reduces the carbon source consumption. And the ultrasonic A 2 O treatment system is combined with the denitrifying phosphorus removal tank, the phosphorus released in the biochemical treatment process of the ultrasonic A 2 O treatment system is treated as the phosphorus source of the denitrifying phosphorus removal tank, and provides a good environment for the enrichment of denitrifying phosphorus removal bacteria in the denitrifying phosphorus removal tank, ensures the phosphorus removal effect. The sludge backflow of the alkali activation tank to the aerobic tank can improve the overall microbial activity of the aerobic tank, supplement the alkalinity of the aerobic tank, ensure more sufficient nitrification, and make the whole device have better denitrification and phosphorus removal effect.

[0008] Further, the pH value of the alkali activation tank is 9-11. By setting the pH value of the alkali activation tank in this way, the ultrasonic wave can dissolve the EPS of the sludge.

[0009] Further, the ultrasonic density of the ultrasonic treatment tank is 0-0.3 W / mL. By setting the ultrasonic density of the ultrasonic treatment tank in this way, the ultrasonic energy consumption can be effectively reduced, and at the same time, enough ultrasonic intensity is ensured to destroy the extracellular polymeric substance in the residual sludge, release polysaccharide and protein, and supplement the carbon source required by the biological treatment unit without increasing additional burden.

[0010] Further, the residual sludge discharge port of the sedimentation tank is communicated with the denitrifying phosphorus removal tank through a four-way pipe, and the four-way pipe is arranged to optimize the pipeline design and facilitate installation.

[0011] Further, one end of the fourth backflow pipe is communicated with the ultrasonic treatment tank through the secondary sedimentation tank, and the other end of the fourth backflow pipe is communicated with the denitrifying phosphorus removal tank. The secondary sedimentation tank is arranged to facilitate the sending of the activated sludge in the ultrasonic treatment tank into the denitrifying phosphorus removal tank.

[0012] Further, a water pump and a flow valve are arranged on the first backflow pipe. The water pump and the flow valve are arranged to facilitate the control of the backflow ratio of the first backflow pipe, and the backflow ratio is the ratio of the backflow flow rate of the ultrasonic treatment tank through the first backflow pipe to the flow rate into the ultrasonic treatment tank, so as to facilitate the control of the carbon-nitrogen ratio in the device within a reasonable range.

[0013] Further, COD sensor and total nitrogen detector are arranged on the sewage inlet pipe, which can reflect the carbon-nitrogen ratio of the sewage entering the device.

[0014] Further, the ultrasonic treatment tank is further provided with a pH adjusting device with a pH range of 9-13, which is used to improve the sludge disintegration effect.

[0015] The utility model discloses a kind of denitrification phosphorus removal coupling ultrasonic and alkali treatment's sewage sludge collaborative treatment device, and its beneficial effect is:

[0016] The utility model combines ultrasonic A 2 O treatment system, denitrification phosphorus removal tank and alkali activation tank, the floc structure in sludge is dispersed by alkali in alkali activation tank, and the floc structure in sludge can be dispersed by alkali in alkali activation tank, stimulate to secrete extracellular polymeric substance (EPS), improve sludge dissolved oxygen utilization rate to improve sludge activity, while the existence of alkali greatly reduces the ultrasonic output power in ultrasonic treatment tank, solve the problem of large ultrasonic energy consumption.Simultaneously sludge realizes cell swelling rupture under the action of alkali and ultrasonic in ultrasonic treatment tank, realizes the effect such as dissolving extracellular polymeric substance, destroying cell wall, changing extracellular osmotic pressure environment, after processing, reflux enters denitrification phosphorus removal tank, supplement carbon source for denitrification phosphorus removal process, reduce carbon source consumption. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure diagram of denitrification phosphorus removal coupling ultrasonic and alkali treatment's sewage sludge collaborative treatment device;

[0018] Wherein: 1, anaerobic tank;2, anoxic tank;3, aerobic tank;4, sedimentation tank;5, ultrasonic treatment tank;6, denitrification phosphorus removal tank;7, alkali activation tank;11, first reflux pipe;12, second reflux pipe;13, third reflux pipe;14, fourth reflux pipe;15, fifth reflux pipe. DETAILED DESCRIPTION

[0019] The specific embodiment of the utility model is described below, so that the person skilled in the art can understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific embodiment, for the person skilled in the ordinary skill in the art, as long as various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, all the utility model creations using the utility model concept are within the scope of protection.

[0020] Reference Figure 1 The embodiment provides a kind of denitrification phosphorus removal coupling ultrasonic and alkali treatment's sewage sludge collaborative treatment device, including ultrasonic A 2 O treatment system, denitrification phosphorus removal tank 6 and alkali activation tank 7.

[0021] Specifically, the ultrasonic wave A 2 The treatment system comprises an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, a sedimentation tank 4 and an ultrasonic treatment tank 5 which are sequentially communicated, the anaerobic tank 1 and the anoxic tank 2 are communicated with a sewage inlet pipe, and the anoxic tank 2 is communicated with the anaerobic tank 1 through a second recirculation pipe 12.

[0022] In the embodiment, the sewage inlet pipe is first divided into two parts, which respectively enter the anaerobic tank 1 and the anoxic tank 2, so as to make different treatment units play specific functions. The anaerobic tank 1 is the first stage of biochemical treatment, and the main purpose is to realize anaerobic phosphorus release, that is, under the condition of anoxia, specific microorganisms can release phosphorus in their bodies, so that the concentration of dissolved phosphorus in sewage is increased. The anoxic tank 2 is used to perform the denitrification process and further remove COD. The mixed liquid of the anoxic tank 2 is recirculated to the anaerobic tank 1 through the second recirculation pipe 12 to maintain the anaerobic environment and ensure anaerobic phosphorus release, so as to realize AA internal recirculation (Anaerobic-Anoxic Internal Recirculation), maintain the sludge concentration in the entire anaerobic tank 1, and make the anaerobic phosphorus release process more efficient.

[0023] Specifically, the denitrifying phosphorus removal tank 6 is communicated and arranged between the anoxic tank 2 and the anaerobic tank 1, the aerobic tank 3 and the ultrasonic treatment tank 5 are respectively communicated with the denitrifying phosphorus removal tank 6 through a third recirculation pipe 13 and a fourth recirculation pipe 14. One end of the fourth recirculation pipe 14 is communicated with the ultrasonic treatment tank 5 through a secondary sedimentation tank, and the other end of the fourth recirculation pipe 14 is communicated with the denitrifying phosphorus removal tank 6. The denitrifying phosphorus removal tank 6 is communicated with a sludge discharge pipe through a residual sludge discharge port of the sedimentation tank 4. In the embodiment, the residual sludge discharge port of the sedimentation tank 4 is communicated with the denitrifying phosphorus removal tank 6 through a four-way pipe, and the other two ends of the four-way pipe are respectively communicated with the ultrasonic treatment tank 5 and the sludge discharge pipe.

[0024] In the embodiment, the mixed liquid of the aerobic tank 3 is recirculated to the denitrifying phosphorus removal tank 6 through the third recirculation pipe 13, so as to realize AO internal recirculation (Anoxic-Oxic Internal Recirculation), provide nitrate nitrogen as an electron acceptor, avoid the influence of dissolved oxygen in the case that the nitrification liquid is recirculated to the anoxic tank 2 and affects the AA internal recirculation, and thus the phosphorus removal effect of the denitrifying phosphorus removal tank 6 is strengthened.

[0025] Specifically, the alkali activation tank 7 is communicated and arranged between the sedimentation tank 4 and the ultrasonic treatment tank 5, the alkali activation tank 7 is communicated with the sedimentation tank 4, and the alkali activation tank 7 is communicated with the aerobic tank 3 through a fifth recirculation pipe 15.

[0026] In this embodiment, the pH value of the alkali activation tank 7 is 9-11, and the ultrasonic density of the ultrasonic treatment tank 5 is 0-0.3 W / mL. The alkali in the alkali activation tank 7 can disperse the flocculent structure in the sludge, stimulating the secretion of extracellular polymeric substances (EPS), increasing the dissolved oxygen utilization rate of the sludge, and thus improving sludge activity. Simultaneously, the presence of alkali significantly reduces the ultrasonic output power in the ultrasonic treatment tank 5, solving the problem of high ultrasonic energy consumption. Furthermore, under the combined action of alkali and ultrasound in the ultrasonic treatment tank 5, the sludge undergoes processes such as dissolving extracellular polymeric substances, disrupting cell walls, and altering the external osmotic pressure environment, leading to cell expansion and rupture. After treatment, the sludge is returned to the denitrification and phosphorus removal tank, supplementing the carbon source for the denitrification and phosphorus removal process and reducing carbon source consumption.

[0027] As another embodiment, a water pump and a flow valve are also installed on the first return pipe 11. The water pump and flow valve facilitate control of the return ratio of the first return pipe 11, which is the ratio of the return flow rate of the ultrasonic treatment tank 5 through the first return pipe 11 to the inlet flow rate of the ultrasonic treatment tank 5, thereby facilitating the control of the carbon-to-nitrogen ratio within the device within a reasonable range. A COD sensor and a total nitrogen analyzer are installed on the wastewater inlet pipe. The COD sensor and total nitrogen analyzer facilitate the reflection of the carbon-to-nitrogen ratio entering the device.

[0028] As a further embodiment, a pH adjustment device with a pH range of 9 to 13 can also be installed in the ultrasonic treatment tank 5. The pH adjustment device is used to improve the sludge breaking effect.

[0029] As a further embodiment, the ultrasonic treatment tank 5 can also be connected to the anoxic tank 2 through the first return pipe 11.

[0030] In summary, the beneficial effects of this solution are as follows:

[0031] This solution will use ultrasonic A 2 The O treatment system, denitrification and phosphorus removal tank 6, and alkali activation tank 7 are combined. The alkali in alkali activation tank 7 disperses the flocculent structure in the sludge, stimulating the secretion of extracellular polymeric substances (EPS), increasing the dissolved oxygen utilization rate of the sludge, and thus improving sludge activity. Simultaneously, the presence of alkali significantly reduces the ultrasonic output power in ultrasonic treatment tank 5, solving the problem of high ultrasonic energy consumption. In ultrasonic treatment tank 5, under the combined action of alkali and ultrasound, the sludge undergoes processes such as dissolving EPS, disrupting cell walls, and altering the external osmotic pressure environment, leading to cell expansion and rupture. The treated sludge is then returned to denitrification and phosphorus removal tank 6, supplementing the carbon source for the denitrification and phosphorus removal process and reducing carbon source consumption.

[0032] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, it should not be understood as limiting the scope of protection of the patent. Various modifications and variations that can be made by those skilled in the art within the scope described in the claims are still within the scope of protection of the patent.

Claims

1. A device for the co-treatment of sewage sludge by denitrifying phosphorus removal coupled with ultrasonic and alkaline treatment, characterized in that, Including ultrasound A 2 O processing system, the ultrasonic A 2 The O treatment system includes an anaerobic tank (1), an anoxic tank (2), an aerobic tank (3), a sedimentation tank (4), and an ultrasonic treatment tank (5) connected in sequence; the anaerobic tank (1) and the anoxic tank (2) are both connected to the sewage inlet pipe; The anoxic tank (2) is communicated with the anaerobic tank (1) through a second reflux pipe (12), and a denitrification and phosphorus removal tank (6) is arranged in communication between the anoxic tank (2) and the anaerobic tank (1), the aerobic tank (3) and the ultrasonic treatment tank (5) are communicated with the denitrification and phosphorus removal tank (6) through a third reflux pipe (13) and a fourth reflux pipe (14) respectively, and the sedimentation tank (4) is communicated with the denitrification and phosphorus removal tank (6) in reflux. An alkali activation tank (7) is arranged in communication between the sedimentation tank (4) and the ultrasonic treatment tank (5), and the alkali activation tank (7) is communicated with the aerobic tank (3) through a fifth reflux pipe (15).

2. The device for the simultaneous treatment of sewage sludge by denitrifying dephosphorization coupled with ultrasonic and alkaline treatment according to claim 1, characterized in that, The pH value of the alkali activation tank (7) is 9-11.

3. The device for the simultaneous treatment of sewage sludge by denitrifying dephosphorization coupled with ultrasonic and alkaline treatment according to claim 1, characterized in that, The ultrasonic density of the ultrasonic treatment tank (5) is 0-0.3 W / mL.

4. The device for the simultaneous treatment of sewage sludge by denitrifying dephosphorization coupled with ultrasonic and alkaline treatment according to claim 1, characterized in that, The residual sludge discharge port of the sedimentation tank (4) is communicated with the denitrification and phosphorus removal tank (6) through a four-way pipe.

5. The device for the simultaneous treatment of sewage sludge by denitrifying dephosphorization coupled with ultrasonic and alkaline treatment according to claim 1, characterized in that, One end of the fourth reflux pipe (14) is communicated with the ultrasonic treatment tank (5) through a secondary sedimentation tank, and the other end of the fourth reflux pipe (14) is communicated with the denitrification and phosphorus removal tank (6).

6. The device for simultaneous treatment of sewage sludge by denitrifying dephosphorization coupled with ultrasonic and alkaline treatment according to claim 1, characterized in that, A COD sensor and a total nitrogen detector are arranged on the sewage inlet pipe.

7. The device for simultaneous treatment of sewage sludge by denitrifying dephosphorization coupled with ultrasonic and alkaline treatment according to claim 1, characterized in that, A pH adjusting device with a pH range of 9-13 is further arranged in the ultrasonic treatment tank (5).

Images