CN216550030U - Efficient carbon adsorption coupling biological nitrogen and phosphorus removal sewage treatment device - Google Patents
Efficient carbon adsorption coupling biological nitrogen and phosphorus removal sewage treatment device Download PDFInfo
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- CN216550030U CN216550030U CN202123123468.4U CN202123123468U CN216550030U CN 216550030 U CN216550030 U CN 216550030U CN 202123123468 U CN202123123468 U CN 202123123468U CN 216550030 U CN216550030 U CN 216550030U
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Abstract
The utility model provides a high-efficiency carbon adsorption coupling biological nitrogen and phosphorus removal sewage treatment device, which comprises: the biological carbon adsorption and phosphorus removal system comprises an anaerobic adsorption tank, a first sedimentation tank, an aerobic tank and a second sedimentation tank which are connected in sequence, wherein the bottom of the second sedimentation tank is connected to the front end of the anaerobic adsorption tank through a first sludge return pipeline; the anaerobic ammonia oxidation system comprises an integrated anaerobic ammonia oxidation tank and a third sedimentation tank which are sequentially connected, and the bottom of the third sedimentation tank is connected to the front end of the integrated anaerobic ammonia oxidation tank through a second sludge return pipeline; the second sedimentation tank is connected with the integrated anaerobic ammonia oxidation tank, so that the biological carbon adsorption and phosphorus removal system is coupled and connected with the anaerobic ammonia oxidation system. The double-sludge system independently performs the sludge backflow and sludge discharge processes, saves the aeration energy consumption, does not need to additionally add nitrogen and phosphorus removal agents, improves the nitrogen removal efficiency of the system and reduces the carbon emission, and can greatly reduce the sewage treatment cost compared with the traditional activated sludge method.
Description
Technical Field
The utility model belongs to the technical field of urban sewage treatment, and particularly relates to a sewage treatment device for efficient carbon adsorption coupled biological nitrogen and phosphorus removal.
Background
The traditional activated sludge process adopts a nitrification and denitrification mode to denitrify, and the denitrification mode has the defects of low denitrification efficiency, high operating cost, large residual sludge yield, high greenhouse gas emission and the like, and restricts the quality improvement and the efficiency improvement of a sewage treatment plant. In recent years, anaerobic ammonia oxidation denitrification processes have attracted extensive attention in the water treatment industry because the reaction process does not need to consume a carbon source and has high denitrification efficiency. Compared with the traditional activated sludge process, the municipal sewage treatment process mainly based on anaerobic ammonia oxidation saves a large amount of carbon sources in the denitrification process, and the carbon sources contain a large amount of energy. For a sewage treatment plant mainly based on a traditional activated sludge process with the treatment scale of more than 10 ten thousand population equivalents, the annual power consumption is 27 kWh/(cap.a) (cap: population equivalent, calculated by 110g COD per 1 population equivalent per day), and the chemical energy contained in organic matters in municipal sewage exceeds the power consumption required by the sewage treatment plant by more than 9 times. The method has the advantages that part of organic matters in the sewage are captured, and then chemical energy of the organic matters is converted into electric energy in modes of anaerobic digestion-combined heat and power generation and the like, so that the method has great significance for realizing complete self-supply of energy consumption of sewage plants and even changing the energy consumption into energy output.
In the urban sewage treatment process mainly based on anaerobic ammonia oxidation, the captured organic matters in the inlet water can not only recover chemical energy in the organic matters through processes such as anaerobic digestion, but also reduce C/N of the sewage, provide inlet water with low organic matter content for the anaerobic ammonia oxidation process, optimize the flora structure of an anaerobic ammonia oxidation system and ensure the stable operation of the anaerobic ammonia oxidation. The adsorption regeneration method utilizes the short-time contact of activated sludge and inlet water to carry out high-efficiency adsorption on organic matters in the sewage, and realizes the recovery of the sludge adsorption activity through aeration regeneration of the sludge. However, the organic matter removal efficiency is low, the effluent also contains more COD, and phosphorus removal is not considered.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides the high-efficiency carbon adsorption coupling biological nitrogen and phosphorus removal sewage treatment device, an adsorption regeneration method is coupled with biological phosphorus removal, sludge backflow and sludge discharge processes are independently carried out through a double-sludge system, carbon and phosphorus in sewage are efficiently removed, C/N of inlet water is reduced, compared with the traditional activated sludge method, the overall process saves aeration energy consumption and nitrogen and phosphorus removal medicine consumption, reduces the sewage treatment cost, and meanwhile, the energy of organic matters can be recovered through an anaerobic digestion-cogeneration process, thereby being beneficial to realizing carbon emission reduction and self-supporting energy of sewage treatment plants.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
the utility model provides a sewage treatment plant of biological nitrogen and phosphorus removal of high-efficient carbon adsorption coupling, includes:
the biological carbon adsorption and phosphorus removal system comprises an anaerobic adsorption tank, a first sedimentation tank, an aerobic tank and a second sedimentation tank which are sequentially connected, wherein the bottom of the second sedimentation tank is connected to the front end of the anaerobic adsorption tank through a first sludge return pipeline;
the anaerobic ammonia oxidation system comprises an integrated anaerobic ammonia oxidation tank and a third sedimentation tank which are sequentially connected, and the bottom of the third sedimentation tank is connected to the front end of the integrated anaerobic ammonia oxidation tank through a second sludge return pipeline;
the second sedimentation tank is connected with the integrated anaerobic ammonia oxidation tank, so that the biological carbon adsorption and phosphorus removal system is coupled and connected with the anaerobic ammonia oxidation system.
Preferably, the anaerobic adsorption tank comprises:
the anaerobic adsorption tank water inlet is formed in the bottom of the side wall of the anaerobic adsorption tank and is connected with an external grit chamber;
the first stirrer is arranged at the bottom or the side wall of the anaerobic adsorption tank.
Preferably, the first sedimentation tank includes:
the first sedimentation tank water inlet is formed in the top of the side wall, close to the anaerobic adsorption tank, of the first sedimentation tank;
the second stirrer is arranged on the upper part of the side wall of the first sedimentation tank, which is close to the anaerobic adsorption tank, and is positioned below the water inlet of the first sedimentation tank;
the back taper bagger, the back taper bagger sets up the bottom of first sedimentation tank, be equipped with the perforation sludge discharge pipe in the back taper bagger, the perforation sludge discharge pipe with the external sludge discharge valve of first sedimentation tank links to each other with the dredge pump.
Preferably, the aerobic tank comprises:
the first aeration pipe and the first aeration discs are arranged at the bottom of the aerobic tank;
the water inlet of the aerobic tank is arranged at the lower part of the side wall of the aerobic tank close to the first sedimentation tank;
and the water outlet of the aerobic tank is arranged at the top of the side wall of the aerobic tank far away from the first sedimentation tank.
Preferably, the second sedimentation tank includes:
and the first automatic sludge scraping and sucking device is arranged at the bottom of the second sedimentation tank.
Preferably, the integrated anaerobic ammonia oxidation tank comprises:
immobilized packing disposed in the integrated anammox cell;
the integrated anaerobic ammonia oxidation tank comprises a second aeration pipe and a plurality of second aeration discs, wherein the second aeration pipe and the plurality of second aeration discs are arranged at the bottom of the integrated anaerobic ammonia oxidation tank.
Preferably, the third sedimentation tank comprises a second automatic mud scraping and sucking device, and the second automatic mud scraping and sucking device is arranged at the bottom of the third sedimentation tank.
Preferably, the first sedimentation tank is connected to an external sludge concentration room.
The technical scheme of the utility model has the beneficial effects that:
1. the utility model is divided into a biological carbon adsorption and dephosphorization system at the front half section and an anaerobic ammonia oxidation system at the back half section, wherein the front half section is used for removing carbon and phosphorus by heterotrophic bacteria, the back half section is used for removing nitrogen by fully autotrophic ammonia oxidation bacteria and anaerobic ammonia oxidation bacteria, the double-sludge system independently carries out sludge backflow and sludge discharge processes, the regulation and control are simpler, a nitrogen and phosphorus removal agent is not required to be additionally added, and the aeration energy consumption can be reduced.
2. The utility model can recover the energy in the organic matters through the anaerobic digestion-cogeneration process, is beneficial to realizing the self-sufficiency of the energy of the sewage treatment plant, and even can convert the sewage treatment plant into energy to be delivered out of a factory.
3. The utility model couples the adsorption-regeneration method with biological phosphorus removal, easily degradable organic matters in inlet water are utilized by phosphorus accumulating bacteria, are assimilated into PHAs and are stored in cells, and suspended matters and macromolecular organic matters are adsorbed by microorganisms; a large amount of organic matters are adsorbed on the surfaces of microorganisms and then deposited and discharged in the first sedimentation tank for anaerobic digestion, and the organic matters are easy to degrade in the anaerobic digestion process, so that the sludge discharge potential of the first sedimentation tank is higher than that of common excess sludge.
4. Part of organic matters are adsorbed by microorganisms and then discharged out of the system along with sludge discharge, and are not completely mineralized into CO2The aeration energy consumption is saved, and the carbon emission of a sewage treatment plant is reduced.
5. The aerobic tank synchronously completes the regeneration of sludge and the aerobic phosphorus absorption process, the COD and TP concentration of the effluent are greatly reduced, and simultaneously the C/N of the sewage is reduced, thereby providing proper inflow water quality for the anaerobic ammonia oxidation process at the rear end, avoiding the excessive proliferation of heterotrophic bacteria in an anaerobic ammonia oxidation system due to excessive organic matters in the anaerobic ammonia oxidation inflow, being beneficial to improving the activity of anaerobic ammonia oxidation functional flora, and further improving the denitrification efficiency of the system.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 is a schematic structural diagram of a sewage treatment apparatus for efficient carbon adsorption coupled biological nitrogen and phosphorus removal according to an embodiment of the present invention;
FIG. 2 is a sectional view of an anaerobic adsorption tank, a first sedimentation tank and an aerobic tank in the sewage treatment apparatus for efficient carbon adsorption coupled biological nitrogen and phosphorus removal in the embodiment of the utility model.
Description of reference numerals:
1. an anaerobic adsorption tank; 1.1, a water inlet of an anaerobic adsorption tank; 1.2, a first stirrer; 2. a first sedimentation tank; 2.1, a water inlet of a first sedimentation tank; 2.2, a second stirrer; 2.3, an inverted conical hopper; 2.4, a mud valve; 2.5, a sludge discharge pump; 3. an aerobic tank; 3.1, a water inlet of the aerobic tank; 3.2, a first aeration disc; 3.3, a water outlet of the aerobic tank; 4. a second sedimentation tank; 4.1, a first sludge return pipeline; 5. an integrated anaerobic ammonia oxidation tank; 6. a third sedimentation tank; 6.1 and a second sludge return pipeline.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
Referring to fig. 1, the utility model provides a high-efficiency carbon adsorption coupled biological nitrogen and phosphorus removal sewage treatment device, comprising:
the biological carbon adsorption and phosphorus removal system comprises an anaerobic adsorption tank 1, a first sedimentation tank 2, an aerobic tank 3 and a second sedimentation tank 4 which are connected in sequence, wherein the bottom of the second sedimentation tank 4 is connected to the front end of the anaerobic adsorption tank 1 through a first sludge return pipeline 4.1;
the anaerobic ammonia oxidation system comprises an integrated anaerobic ammonia oxidation tank 5 and a third sedimentation tank 6 which are sequentially connected, and the bottom of the third sedimentation tank 6 is connected to the front end of the integrated anaerobic ammonia oxidation tank 5 through a second sludge return pipeline 6.1;
the second sedimentation tank 4 is connected with the integrated anaerobic ammonia oxidation tank 5, so that the biological carbon adsorption and phosphorus removal system is coupled and connected with the anaerobic ammonia oxidation system.
Specifically, after most of suspended matters and sand grains are removed from raw water through a grid and a grit chamber, the raw water enters a sewage treatment device with high-efficiency carbon adsorption coupled with biological nitrogen and phosphorus removal, and an anaerobic adsorption tank 1 is used for carrying out quick adsorption of organic matters and release of phosphorus; then the sewage enters a first sedimentation tank 2, the retention time of the sewage in the tank is short, the sewage is a short-time sedimentation tank, a part of sludge in the sewage is discharged after being deposited in a mud bucket of the first sedimentation tank 2, and the other part of sludge directly flows into an aerobic tank 3 of the next stage; the aerobic tank 3 is used for regenerating the sludge adsorption capacity and absorbing phosphorus; the effluent enters a second sedimentation tank 4 for mud-water separation, the effluent of the second sedimentation tank 4 enters an integrated anaerobic ammonia oxidation tank 5 for high-efficiency denitrification, and the sludge flows back to the front end of the anaerobic adsorption tank 1; and (3) the denitrified anaerobic ammonia oxidation effluent enters a third sedimentation tank 6 for sludge-water separation, and sludge in the third sedimentation tank 6 is deposited and then flows back to the front end of the integrated anaerobic ammonia oxidation tank 5.
This device divide into the biological carbon adsorption and dephosphorization system of first half section and the anaerobic ammonium oxidation system of second half section, and first half section is accomplished getting rid of carbon and phosphorus by heterotrophic bacteria, and the denitrogenation is accomplished by the ammonia oxidizing bacteria and the anaerobic ammonium oxidizing bacteria of complete autotrophy to second half section, and two mud systems independently carry out mud backward flow and arrange the mud process, and it is simpler to regulate and control, has guaranteed simultaneously that every mud system controls suitable sludge age respectively, helps the stability of system's fungus crowd structure and the promotion of system processing efficiency.
The device couples the adsorption regeneration method with biological phosphorus removal, and removes phosphorus while adsorbing and recovering organic matters, so that synchronous and efficient removal of carbon and phosphorus can be realized, C/N of sewage is reduced, proper water inflow is provided for an anaerobic ammonia oxidation process, excessive proliferation of heterotrophic bacteria in an anaerobic ammonia oxidation system is avoided, and the stability and treatment efficiency of the system are improved; meanwhile, organic matters in the inlet water quickly enter an anaerobic digestion methane production stage through an adsorption-sludge discharge process, and energy in the organic matters can be converted into electric energy through cogeneration, so that the self-supply of the energy of a sewage treatment plant is facilitated, and the sewage treatment plant can be converted into energy to be delivered out of a factory.
Further, the sludge discharged from the first sedimentation tank 2 is concentrated and then subjected to anaerobic digestion to produce methane, and part of organic matters are adsorbed by microorganisms and then discharged out of the system along with the sludge, and are not completely mineralized into CO2The aeration energy consumption is saved, and the carbon emission of a sewage treatment plant is reduced.
Referring to fig. 2, a preferred example, the anaerobic adsorption tank 1 includes:
the water inlet 1.1 of the anaerobic adsorption tank is arranged at the bottom of the side wall of the anaerobic adsorption tank 1, and the water inlet 1.1 of the anaerobic adsorption tank is connected with an external grit chamber;
the first stirrer 1.2 is arranged at the bottom of the anaerobic adsorption tank 1, and the first stirrer 1.2 is arranged at the bottom of the anaerobic adsorption tank 1.
Specifically, after most suspended matters and sand grains in domestic sewage are removed through the grating and the grit chamber, the domestic sewage enters the anaerobic adsorption tank 1 through an anaerobic adsorption tank water inlet 1.1 connected with an external grit chamber, anaerobic stirring of the first stirrer 1.2 promotes contact of microorganisms and pollutants in inflow water, rapid adsorption and anaerobic phosphorus release of organic matters are realized, and effluent enters the first sedimentation tank 2.
Referring to fig. 2, a preferred example, the first settling tank 2 includes:
a water inlet 2.1 of the first sedimentation tank, wherein the water inlet 2.1 of the first sedimentation tank is arranged at the top of the side wall of the first sedimentation tank 2 close to the anaerobic adsorption tank 1;
the second stirrer 2.2 is arranged on the upper part of the side wall of the first sedimentation tank 2 close to the anaerobic adsorption tank 1 and below the water inlet 2.1 of the first sedimentation tank;
back taper bagger 2.3, back taper bagger 2.3 set up in the bottom of first sedimentation tank 2, are equipped with the perforation sludge discharge pipe in the back taper bagger, and the perforation sludge discharge pipe links to each other with sludge discharge pump 2.5 with the external sludge discharge valve 2.4 of first sedimentation tank 2.
Specifically, the second stirrer 2.2 is arranged at the position, close to the upper part, of the side wall of the first sedimentation tank 2, the slow stirring of the second stirrer 2.2 can prevent sludge from accumulating to form a dead zone, a part of sludge is discharged after being deposited in the inverted conical hopper 2.3 of the first sedimentation tank 2, and a part of sludge directly flows into the aerobic tank 3. The back taper mud bucket 2.3 has been arranged to first sedimentation tank 2 bottom, is equipped with the perforation mud pipe in the back taper mud bucket 2.3, and the mud pipe links to each other with dredge pump 2.5 with the mud valve 2.4 outside the pond for the mud of deposit in the first sedimentation tank 2 of periodic discharge.
Referring to fig. 2, a preferred example, the aerobic tank 3 includes:
the first aeration pipe and the plurality of first aeration discs 3.2 are arranged at the bottom of the aerobic tank 3;
a water inlet 3.1 of the aerobic tank, and a water inlet 3.1 of the aerobic tank are arranged at the lower part of the side wall of the aerobic tank 3 close to the first sedimentation tank 2;
the water outlet 3.3 of the aerobic tank is arranged at the top of the side wall of the aerobic tank 3 far away from the first sedimentation tank 2.
Specifically, the water inlet 3.1 of the aerobic tank 3 is at a certain distance from the bottom of the tank, so as to avoid the water inlet process from causing excessive disturbance to the sludge deposition process at the bottom of the first sedimentation tank 2. The bottom of the aerobic tank 3 is provided with a first aeration pipe and a plurality of first aeration discs 3.2, dissolved oxygen is provided for the biochemical reaction of microorganisms, sludge adsorbed with a large amount of organic matters is regenerated through aeration, the recovery of the sludge adsorption activity is realized, and meanwhile, phosphorus accumulating bacteria perform aerobic phosphorus absorption. The regeneration of mud and the aerobic phosphorus uptake process are accomplished in step in the good oxygen pond 3, and play water COD and TP concentration reduces by a wide margin, has reduced the C/N of sewage simultaneously, provides suitable quality of water of intaking for the anaerobic ammonium oxidation process of rear end, avoids the anaerobic ammonium oxidation to intake in the organic matter too much, causes the excessive proliferation of heterotrophic bacteria in the anaerobic ammonium oxidation system, helps improving the activity of anaerobic ammonium oxidation functional flora, and then improves the denitrogenation efficiency of system.
In a preferred example, the second sedimentation tank 4 comprises:
and the first automatic mud scraping and sucking device is arranged at the bottom of the second sedimentation tank 4.
Specifically, the second sedimentation tank 4 is selected from a horizontal flow sedimentation tank or a vertical flow sedimentation tank, the bottom of the second sedimentation tank 4 is provided with a first automatic sludge scraping and sucking device, and the first automatic sludge scraping and sucking device enables sludge deposited at the bottom to flow back to the front end of the anaerobic adsorption tank 1 through a first sludge return pipeline 4.1. The sludge age of the biological carbon adsorption and phosphorus removal system (the anaerobic adsorption tank 1, the first sedimentation tank 2, the aerobic tank 3 and the second sedimentation tank 4) in the first half section is maintained through bottom pollution discharge, the shorter sludge age is beneficial to culturing heterotrophic bacteria which are rapidly proliferated and have strong adsorption capacity, and meanwhile, ammonia oxidizing bacteria are elutriated to prevent the denitrification process and the anaerobic phosphorus release process from competing for organic matters.
In a preferred example, the integrated anammox tank 5 comprises:
the immobilized filler is arranged in the integrated anaerobic ammonia oxidation tank 5;
the second aeration pipe and a plurality of second aeration discs are arranged at the bottom of the integrated anaerobic ammonia oxidation tank 5.
The utility model discloses a short distance nitrification sludge is inoculated in integral type anaerobic ammonia oxidation pond 5, and arranged the immobilization filler, provide the carrier for anaerobic ammonia oxidation bacteria's attached growth, help anaerobic ammonia oxidation bacteria's persistence, second aeration pipe and a plurality of second aeration dish have been arranged to integral type anaerobic ammonia oxidation pond 5's bottom, last low oxygen aeration, for short distance nitrification process provides dissolved oxygen, and strengthen anaerobic ammonia oxidation pond's hydraulic mixing, strengthen the mass transfer effect, realize high-efficient denitrogenation through short distance nitrification coupling anaerobic ammonia oxidation reaction.
In a preferred example, the third sedimentation tank 6 comprises a second automatic sludge scraping and sucking device, and the second automatic sludge scraping and sucking device is arranged at the bottom of the third sedimentation tank 6.
Specifically, the bottom of the third sedimentation tank 6 is provided with a second automatic sludge scraping and sucking device, and the second automatic sludge scraping and sucking device enables sludge deposited at the bottom to flow back to the front end of the integrated anaerobic ammonia oxidation tank 5 through a second sludge return pipeline 6.1.
In a preferred example, the first sedimentation tank 2 is connected to an external sludge thickening room.
Specifically, the first sedimentation tank 2 is connected to an external sludge concentration room, and the sludge is subjected to anaerobic digestion to produce methane after being concentrated. Since a large amount of organic matters are adsorbed on the surface of the sludge and are easily degraded in the anaerobic digestion process, the sludge discharge potential of the first sedimentation tank 2 is higher than that of ordinary excess sludge.
Furthermore, the energy in the organic matters can be recovered through the anaerobic digestion-combined heat and power generation process, the self-supply of the energy of the sewage treatment plant is facilitated, and the sewage treatment plant can be even converted into energy to be delivered out of a factory.
The utility model also provides a sewage treatment method for coupling the high-efficiency carbon adsorption with the biological nitrogen and phosphorus removal, and the sewage treatment method utilizing the high-efficiency carbon adsorption with the biological nitrogen and phosphorus removal comprises the following steps:
inoculating activated sludge into an anaerobic adsorption tank 1 and an aerobic tank 3 of a biological carbon adsorption and phosphorus removal system, and inoculating short-cut nitrified sludge and immobilized filler with anaerobic ammonium oxidation bacteria into an integrated anaerobic ammonium oxidation tank 5 of an anaerobic ammonium oxidation system;
sequentially passing the sewage treated by the grit chamber through an anaerobic adsorption tank 1, a first sedimentation tank 2, an aerobic tank 3, a second sedimentation tank 4, an integrated anaerobic ammonia oxidation tank 5 and a third sedimentation tank 6;
the sludge at the bottom of the second sedimentation tank 4 is refluxed to the front end of the anaerobic adsorption tank 1 through a first sludge reflux pipeline 4.1;
and (3) returning the sludge at the bottom of the third sedimentation tank 6 to the front end of the integrated anaerobic ammonia oxidation tank 5 through a second sludge return pipeline 6.1.
Specifically, common activated sludge is inoculated into the anaerobic adsorption tank 1 and the aerobic tank 3, and preferably activated sludge with good biological phosphorus removal effect is inoculated; the sludge concentration in the anaerobic adsorption tank 1 is 3000-6000 mg/L, the rapid adsorption and anaerobic phosphorus release of organic matters are carried out, and effluent enters a first sedimentation tank 2; adjusting the stirring intensity of the upper part of the first sedimentation tank 2 to enable part of sludge to be deposited in a sludge hopper at the bottom of the first sedimentation tank 2, enabling part of sludge to enter the aerobic tank 3 along with water flow, and maintaining the sludge concentration of the aerobic tank 3 at 3000-6000 mg/L; adjusting the aeration intensity in the aerobic tank 3, and performing sludge regeneration and excessive phosphorus absorption of phosphorus accumulating bacteria; the effluent of the aerobic tank 3 enters a second sedimentation tank 4 for sludge-water separation, the effluent of the second sedimentation tank 4) enters an integrated anaerobic ammonia oxidation tank 5, and sludge deposited at the bottom of the second sedimentation tank 4 flows back to the front end of the anaerobic adsorption tank 1; the integrated anaerobic ammonia oxidation tank 5 is inoculated with the shortcut nitrification sludge and the filler attached with anaerobic ammonia oxidation bacteria, the low-oxygen aeration is continued, and the dissolved oxygen is controlled below 0.3mg/L, so that the coupling of the shortcut nitrification and the anaerobic ammonia oxidation is realized; and (3) allowing the anaerobic ammonia oxidation effluent to enter a third sedimentation tank 6 for sludge-water separation, and refluxing sludge deposited at the bottom of the third sedimentation tank 6 to the front end of the integrated anaerobic ammonia oxidation tank 5.
The method is characterized in that a double-sludge system is formed by a biological carbon adsorption and dephosphorization system at the first half section and an anaerobic ammonia oxidation system at the second half section, the first half section is used for removing carbon and phosphorus by heterotrophic bacteria, the second half section is used for removing nitrogen by fully autotrophic ammonia oxidation bacteria and anaerobic ammonia oxidation bacteria, the double-sludge system independently performs sludge backflow and sludge discharge processes, the regulation and control are simpler, and simultaneously, each sludge system is ensured to respectively control proper sludge age, thereby being beneficial to the stability of system flora structure and the improvement of system treatment efficiency.
Furthermore, the method does not need to add nitrogen and phosphorus removal agents additionally, and can reduce the energy consumption of aeration, so that the sewage treatment cost can be greatly reduced compared with the traditional activated sludge method.
Further, an adsorption-regeneration method is coupled with biological phosphorus removal, easily degradable organic matters in inlet water are utilized by phosphorus accumulating bacteria, are assimilated into PHAs and are stored in cells, and suspended matters and macromolecular organic matters are adsorbed by microorganisms; the microorganism surface adsorbs a large amount of organic matters, and then the organic matters are deposited and discharged in the first sedimentation tank 2 for anaerobic digestion, and the organic matters are easy to degrade in the anaerobic digestion process, so that the sludge discharged from the first sedimentation tank 2 has higher methane production potential compared with common excess sludge.
A preferred example, the method further comprises:
the sludge age of the biological carbon adsorption and phosphorus removal system is maintained at 1-5 days, and the anaerobic ammonia oxidation system does not discharge sludge.
Specifically, sludge is discharged from the bottom of the first sedimentation tank 2, the sludge age of the first half section of the biological carbon adsorption and phosphorus removal system (the anaerobic adsorption tank 1+ the first sedimentation tank 2+ the aerobic tank 3+ the second sedimentation tank 4) is maintained to be 1-5 days, the shorter sludge age is beneficial to culturing heterotrophic bacteria which are rapidly proliferated and have strong adsorption capacity, and meanwhile, ammonia oxidizing bacteria are elutriated, so that organic matters are prevented from competing in a denitrification process and an anaerobic phosphorus release process.
Meanwhile, the sludge systems are ensured to respectively control the proper sludge age, and the stability of the flora structure of the system and the improvement of the treatment efficiency of the system are facilitated.
Example 1
As shown in fig. 1, the present embodiment provides a high efficiency carbon adsorption coupled biological nitrogen and phosphorus removal sewage treatment apparatus, including:
the biological carbon adsorption and phosphorus removal system comprises an anaerobic adsorption tank 1, a first sedimentation tank 2, an aerobic tank 3 and a second sedimentation tank 4 which are connected in sequence, wherein the bottom of the second sedimentation tank 4 is connected to the front end of the anaerobic adsorption tank 1 through a first sludge return pipeline 4.1;
the anaerobic ammonia oxidation system comprises an integrated anaerobic ammonia oxidation tank 5 and a third sedimentation tank 6 which are sequentially connected, and the bottom of the third sedimentation tank 6 is connected to the front end of the integrated anaerobic ammonia oxidation tank 5 through a second sludge return pipeline 6.1;
the second sedimentation tank 4 is connected with the integrated anaerobic ammonia oxidation tank 5, so that the biological carbon adsorption and phosphorus removal system is coupled and connected with the anaerobic ammonia oxidation system.
In this embodiment, the anaerobic adsorption tank 1 includes:
the water inlet 1.1 of the anaerobic adsorption tank is arranged at the bottom of the side wall of the anaerobic adsorption tank 1, and the water inlet 1.1 of the anaerobic adsorption tank is connected with an external grit chamber;
the first stirrer 1.2 is arranged at the bottom of the anaerobic adsorption tank 1, and the first stirrer 1.2 is arranged at the bottom of the anaerobic adsorption tank 1.
In this embodiment, the first sedimentation tank 2 includes:
a water inlet 2.1 of the first sedimentation tank, wherein the water inlet 2.1 of the first sedimentation tank is arranged at the top of the side wall of the first sedimentation tank 2 close to the anaerobic adsorption tank 1;
the second stirrer 2.2 is arranged on the upper part of the side wall of the first sedimentation tank 2 close to the anaerobic adsorption tank 1 and below the water inlet 2.1 of the first sedimentation tank;
back taper bagger 2.3, back taper bagger 2.3 set up in the bottom of first sedimentation tank 2, are equipped with the perforation sludge discharge pipe in the back taper bagger, and the perforation sludge discharge pipe links to each other with sludge discharge pump 2.5 with the external sludge discharge valve 2.4 of first sedimentation tank 2.
In this embodiment, the aerobic tank 3 includes:
the first aeration pipe and the plurality of first aeration discs 3.2 are arranged at the bottom of the aerobic tank 3;
a water inlet 3.1 of the aerobic tank, and a water inlet 3.1 of the aerobic tank are arranged at the lower part of the side wall of the aerobic tank 3 close to the first sedimentation tank 2;
the water outlet 3.3 of the aerobic tank is arranged at the top of the side wall of the aerobic tank 3 far away from the first sedimentation tank 2.
In this embodiment, the second sedimentation tank 4 includes:
and the first automatic mud scraping and sucking device is arranged at the bottom of the second sedimentation tank 4.
In this embodiment, the integrated anammox tank 5 includes:
the immobilized filler is arranged in the integrated anaerobic ammonia oxidation tank 5;
the second aeration pipe and a plurality of second aeration discs are arranged at the bottom of the integrated anaerobic ammonia oxidation tank 5.
In this embodiment, the third sedimentation tank 6 includes:
and the second automatic mud scraping and sucking device is arranged at the bottom of the third sedimentation tank 6.
In this embodiment, the first sedimentation tank 2 is connected to an external sludge thickening room.
Example 2
The embodiment provides a sewage treatment method for coupling high-efficiency carbon adsorption with biological nitrogen and phosphorus removal, which utilizes the sewage treatment device for coupling high-efficiency carbon adsorption with biological nitrogen and phosphorus removal, and comprises the following steps:
inoculating activated sludge into an anaerobic adsorption tank 1 and an aerobic tank 3 of a biological carbon adsorption and phosphorus removal system, and inoculating short-cut nitrified sludge and immobilized filler with anaerobic ammonium oxidation bacteria into an integrated anaerobic ammonium oxidation tank 5 of an anaerobic ammonium oxidation system;
sequentially passing the sewage treated by the grit chamber through an anaerobic adsorption tank 1, a first sedimentation tank 2, an aerobic tank 3, a second sedimentation tank 4, an integrated anaerobic ammonia oxidation tank 5 and a third sedimentation tank 6;
the sludge at the bottom of the second sedimentation tank 4 is refluxed to the front end of the anaerobic adsorption tank 1 through a first sludge reflux pipeline 4.1;
and the sludge at the bottom of the third sedimentation tank 6 is refluxed to the front end of the integrated anaerobic ammonia oxidation tank 5 through a second sludge reflux pipeline 6.1.
In this embodiment, the method further includes:
the sludge age of the biological carbon adsorption and phosphorus removal system is maintained at 1-5 days, and the anaerobic ammonia oxidation system does not discharge sludge.
The specific test water is the effluent of an aeration grit chamber of a certain sewage treatment plant, and the water quality is as follows: the COD concentration is 300-600 mg/L; the ammonia nitrogen concentration is 35-50 mg/L, and the nitrite nitrogen<0.5mg/L, nitro-nitrogen<0.5mg/L, and the concentration of TP is 5-8 mg/L. Experimental technological process referring to FIG. 1, each reactor is made of stainless steel, and the effective volume of the anaerobic adsorption tank is 0.6m3The effective volume of the first sedimentation tank is 0.4m3The effective volume of the aerobic tank is 2.0m3The effective volume of the integrated anaerobic ammonia oxidation tank is 2.5m3The effective volumes of the sedimentation tank A and the sedimentation tank B are both 2.0m3。
The specific operation is as follows:
1) startup of system
Inoculating activated sludge with good biological phosphorus removal effect into the anaerobic adsorption tank 1 and the aerobic tank 3; the sludge concentration in the anaerobic adsorption tank 1 is about 4000mg/L, the rapid adsorption and anaerobic phosphorus release of organic matters are carried out, and the effluent enters a first sedimentation tank 2; adjusting the stirring intensity of the upper part of the first sedimentation tank 2 to ensure that part of sludge is deposited in a sludge hopper at the bottom of the first sedimentation tank 2, and part of sludge enters the aerobic tank 3 along with water flow, so as to maintain the sludge concentration of the aerobic tank 3 to be about 4500 mg/L; adjusting the aeration intensity in the aerobic tank 3, and performing sludge regeneration and excessive phosphorus absorption of phosphorus accumulating bacteria; the effluent of the aerobic tank 3 enters a second sedimentation tank 4 for mud-water separation, the effluent of the second sedimentation tank 4 enters an integrated anaerobic ammonia oxidation tank 5, and sludge deposited at the bottom of the second sedimentation tank 4 flows back to the front end of the anaerobic adsorption tank 1; the integrated anaerobic ammonia oxidation tank 5 is inoculated with the shortcut nitrification sludge and the filler attached with anaerobic ammonia oxidation bacteria, the low-oxygen aeration is continued, and the dissolved oxygen is controlled below 0.3mg/L, so that the coupling of the shortcut nitrification and the anaerobic ammonia oxidation is realized; and (4) feeding the anaerobic ammonia oxidation effluent into a third sedimentation tank 6 for sludge-water separation, and refluxing sludge deposited at the bottom of the third sedimentation tank 6 to the front end of the integrated anaerobic ammonia oxidation tank 5.
2) Regulation of a system
2-1: the anaerobic adsorption tank 1 is used for carrying out rapid adsorption and anaerobic phosphorus release of organic matters, the HRT is controlled to be 30 minutes, and the sludge concentration is about 4000 mg/L;
2-2: the aerobic tank 3 is used for regenerating sludge and performing aerobic excessive phosphorus absorption, the HRT is controlled to be 120 minutes, the sludge concentration is about 4500mg/L, and the dissolved oxygen is 1-2 mg/L;
2-3: sludge is discharged from the bottom of the first sedimentation tank 2, and the sludge age of the biological carbon adsorption and phosphorus removal system (the anaerobic adsorption tank 1+ the first sedimentation tank 2+ the aerobic tank 3+ the second sedimentation tank 4) in the first half section is maintained for 3 days.
2-4: the integrated anaerobic ammonia oxidation tank 5 carries out short-cut nitrification coupling anaerobic ammonia oxidation reaction, HRT is controlled to be 180 minutes, the concentration of suspended sludge is about 5000mg/L, and dissolved oxygen is less than 0.3 mg/L; when the phenomena of unstable short-range nitrification and nitrate accumulation occur, the nitrite oxidizing bacteria are inhibited by adding the inhibitor.
The test result shows that: after the operation is stable, the COD concentration in the final effluent of the system is 35-50 mg/L, the ammonia nitrogen is less than 1mg/L, the nitrate nitrogen is less than 5mg/L, TN is less than 10mg/L, and TP is less than 0.3 mg/L. The sewage treatment device with high-efficiency carbon adsorption coupled with biological nitrogen and phosphorus removal provided by the utility model can be widely applied to the treatment of urban domestic sewage.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (8)
1. The utility model provides a sewage treatment plant of biological nitrogen and phosphorus removal of high-efficient carbon adsorption coupling which characterized in that includes:
the biological carbon adsorption and phosphorus removal system comprises an anaerobic adsorption tank, a first sedimentation tank, an aerobic tank and a second sedimentation tank which are sequentially connected, wherein the bottom of the second sedimentation tank is connected to the front end of the anaerobic adsorption tank through a first sludge return pipeline;
the anaerobic ammonia oxidation system comprises an integrated anaerobic ammonia oxidation tank and a third sedimentation tank which are sequentially connected, and the bottom of the third sedimentation tank is connected to the front end of the integrated anaerobic ammonia oxidation tank through a second sludge return pipeline;
the second sedimentation tank is connected with the integrated anaerobic ammonia oxidation tank, so that the biological carbon adsorption and phosphorus removal system is coupled and connected with the anaerobic ammonia oxidation system.
2. The wastewater treatment plant according to claim 1, wherein the anaerobic adsorption tank comprises:
the anaerobic adsorption tank water inlet is formed in the bottom of the side wall of the anaerobic adsorption tank and is connected with an external grit chamber;
the first stirrer is arranged at the bottom or the side wall of the anaerobic adsorption tank.
3. The wastewater treatment apparatus according to claim 1, wherein the first sedimentation tank comprises:
the first sedimentation tank water inlet is formed in the top of the side wall, close to the anaerobic adsorption tank, of the first sedimentation tank;
the second stirrer is arranged on the upper part of the side wall of the first sedimentation tank, which is close to the anaerobic adsorption tank, and is positioned below the water inlet of the first sedimentation tank;
the back taper bagger, the back taper bagger sets up the bottom of first sedimentation tank, be equipped with the perforation sludge discharge pipe in the back taper bagger, the perforation sludge discharge pipe with the external sludge discharge valve of first sedimentation tank links to each other with the dredge pump.
4. The wastewater treatment apparatus according to claim 1, wherein the aerobic tank comprises:
the first aeration pipe and the first aeration discs are arranged at the bottom of the aerobic tank;
the water inlet of the aerobic tank is arranged at the lower part of the side wall of the aerobic tank close to the first sedimentation tank;
and the water outlet of the aerobic tank is arranged at the top of the side wall of the aerobic tank far away from the first sedimentation tank.
5. The wastewater treatment apparatus according to claim 1, wherein the second sedimentation tank comprises:
and the first automatic sludge scraping and sucking device is arranged at the bottom of the second sedimentation tank.
6. The wastewater treatment plant of claim 1, wherein the integrated anammox tank comprises:
immobilized packing disposed in the integrated anammox cell;
the integrated anaerobic ammonia oxidation tank comprises a second aeration pipe and a plurality of second aeration trays, wherein the second aeration pipe and the plurality of second aeration trays are arranged at the bottom of the integrated anaerobic ammonia oxidation tank.
7. The sewage treatment device of claim 1, wherein the third sedimentation tank comprises a second automatic sludge scraping and sucking device, and the second automatic sludge scraping and sucking device is arranged at the bottom of the third sedimentation tank.
8. The wastewater treatment apparatus according to claim 1, wherein the first sedimentation tank is connected to an external sludge thickening room.
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