CN218231885U - Device for improving denitrification of wastewater - Google Patents
Device for improving denitrification of wastewater Download PDFInfo
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- CN218231885U CN218231885U CN202220316429.1U CN202220316429U CN218231885U CN 218231885 U CN218231885 U CN 218231885U CN 202220316429 U CN202220316429 U CN 202220316429U CN 218231885 U CN218231885 U CN 218231885U
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Abstract
The invention provides a device for enhancing grid slag, settling sand, hydrolyzing, acidifying and releasing carbon to improve wastewater denitrification and denitrogenation, which comprises a hydrolyzing and acidifying tank, a sand storage tank, a sludge digestion tank and a denitrification filter tank, wherein a sand outlet of the sand storage tank is communicated with one end of a variable-speed spiral sand feeder, and the other end of the variable-speed spiral sand feeder is communicated with the tank wall of the hydrolyzing and acidifying tank. The device integrates sand feeding, water feeding, bacteria feeding, hydrolytic acidification reaction and water discharging, and strengthens the hydrolytic acidification carbon release effect of the grid slag and the settled sand through the scouring action of the machine and the water feeding and the inoculation of the hydrolytic acidification bacteria; the device of the invention is used for wastewater treatment, can improve the current situation that the denitrification filter tank in the advanced treatment process of a sewage treatment plant has poor total nitrogen removal effect and is even abandoned due to insufficient carbon source of inlet water, and strengthens the biological denitrification process.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a device for strengthening grid slag, settling sand, hydrolyzing, acidifying, releasing carbon and improving wastewater denitrification and denitrification.
Background
At present, the phenomenon that the total nitrogen removal efficiency is low or even does not reach the standard generally exists in sewage treatment plants in China, and the main reason is that the denitrification carbon source is insufficient. With the stricter and stricter standards of water quality of effluent of sewage treatment plants by governments in China, advanced treatment stages are added in most sewage treatment plants, wherein denitrification filters are widely applied to advanced denitrification of wastewater, but due to the characteristic of insufficient carbon source of effluent of secondary treatment, the total nitrogen removal effect of the operation of the filters is poor and even is discarded, or an additional carbon source is needed to achieve a better operation effect, so that the operation cost of the water plant is increased. In fact, a certain amount of organic matters are adsorbed on the surfaces of the grid slag and the settled sand in the primary treatment stage of the water plant, and the part of waste adsorbing the organic matters cannot be effectively utilized at present. If the part of the organic carbon source can be supplemented to the denitrification unit, the total nitrogen removal efficiency can be effectively improved, and an additional carbon source can be saved.
Disclosure of Invention
The invention provides a device for improving denitrification and denitrogenation of wastewater, aiming at solving the problems of poor total nitrogen removal effect and low utilization rate of a denitrification filter tank caused by insufficient carbon source of inlet water in a sewage treatment plant of the existing advanced treatment process.
In order to achieve the aim, the invention provides a device for improving denitrification and denitrogenation of wastewater, which comprises a hydrolysis acidification tank, a sand storage tank, a sludge digestion tank and a denitrification filter tank, wherein a sand outlet of the sand storage tank is communicated with one end of a variable speed spiral sand feeder, and the other end of the variable speed spiral sand feeder is communicated with the tank wall of the hydrolysis acidification tank;
the hydrolysis acidification tank is of an inverted cone-shaped closed structure, the top end of the hydrolysis acidification tank is provided with a hydrolysis acidification tank effluent weir, the outer side of the hydrolysis acidification tank effluent weir is provided with a stainless steel filter screen, and a sand outlet of the variable speed spiral sand feeder is arranged close to the position under the stainless steel filter screen; a variable speed stirrer is arranged in the middle inside the hydrolysis acidification tank;
the sludge digestion tank is communicated with the hydrolysis acidification tank through a bacterium adding pipe, and the bacterium adding pipe is arranged under the variable-speed spiral sand feeder;
the water inlet pipe of the hydrolysis acidification tank is connected with the normal drain pipe of the denitrification filter tank, the effluent of the denitrification filter tank is pumped into the water inlet pipe of the hydrolysis acidification tank through an adjustable water inlet jet pump, and jet type effluent nozzles are distributed on the water inlet pipe of the hydrolysis acidification tank; the hydrolysis acidification tank effluent weir is connected with a filter carbon source supplement water inlet pipe, and the other end of the filter carbon source supplement water inlet pipe is communicated with the denitrification filter.
Further, the reaction area above the hydrolysis acidification tank is cylindrical, the sand discharge area below the hydrolysis acidification tank is conical, and the gradient is designed to be 20 degrees; the sand feeding speed of the variable-speed spiral sand feeder is adjustable and is controlled by a variable-speed motor arranged at the top end of the variable-speed spiral sand feeder; the installation gradient of the variable-speed spiral sand feeder is 25 degrees.
Furthermore, the bacteria adding pipe is provided with a bacteria adding pipe valve and a bacteria adding pump, and the hydrolytic acidification bacteria in the sludge digestion tank are pumped into the hydrolytic acidification tank through the bacteria adding pump.
Furthermore, a filter outlet channel and a filter backwashing outlet channel are respectively arranged at the top of the denitrification filter; the normal filter tank drainage pipe is communicated with the filter tank water outlet channel, and the filter tank backwashing water outlet channel is connected with a filter tank backwashing drainage pipe; and a biological filter material is filled in the denitrification filter.
Furthermore, the bottom of the denitrification filter tank is connected with a back-flushing air inlet pipe and a back-flushing water inlet pipe, the bottom of the denitrification filter tank is also communicated with the secondary sedimentation tank through the water inlet pipe of the denitrification filter tank, and a special filter head is arranged at the joint of the water inlet pipe of the denitrification filter tank and the denitrification filter tank.
The working principle of the invention is as follows: a certain amount of considerable organic matters are adsorbed on the surfaces of the grid slag and the settled sand in the primary treatment stage of the water plant, and the grid slag and the settled sand enter a hydrolysis acidification tank through a spiral sand feeder and are inoculated with hydrolysis acidification bacteria from the hydrolysis acidification stage of a sludge digestion tank. The variable-speed stirrer and the jet-flow state water inflow in the tank can wash part of adsorbed organic matters off the surfaces of the grid slag and the sand setting, and the adsorbed and washed organic matters are hydrolyzed and acidified in the anaerobic environment in the tank to convert a macromolecular carbon source into a micromolecular carbon source which is easy to absorb and utilize by denitrifying bacteria. The effluent of the hydrolysis acidification tank containing the carbon source supplement is pumped to a denitrification filter tank in the advanced treatment process, water is uniformly distributed through a water distribution pipeline at the bottom of the tank, the effluent from a secondary sedimentation tank is subjected to carbon source supplement at the bottom of the filter tank, and the effluent of the secondary sedimentation tank after the carbon source supplement enters a biological filler region through a special filter head for denitrification.
Compared with the prior art, the invention has the following beneficial effects:
the device integrates sand feeding, water feeding, bacteria feeding, hydrolytic acidification reaction and water discharging, and strengthens the hydrolytic acidification carbon release effect of the grid slag and the settled sand through the scouring action of the machine and the water feeding and the inoculation of the hydrolytic acidification bacteria; the effective utilization of the grid slag and the sand setting waste generated in the primary treatment stage of the sewage treatment plant can be realized, and the waste is changed into the valuable; a new idea is provided for recycling the carbon source lost in the sewage treatment plant, the adding amount of the additional carbon source of 10-20% of the sewage treatment plant can be reduced, and the sewage treatment plant is assisted to save energy and reduce consumption; the method can improve the current situation that the denitrification filter tank in the advanced treatment process of the sewage treatment plant has poor total nitrogen removal effect and is even abandoned due to insufficient carbon source of inlet water, and strengthens the biological denitrification process.
Drawings
In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from this drawing by a person skilled in the art.
FIG. 1 is a schematic structural diagram of an apparatus for enhancing denitrification of wastewater;
description of reference numerals: 1. a hydrolysis acidification pool, 2, a variable speed spiral sand feeder, 3, a sludge digestion pool, 4, a secondary sedimentation pool, 5, a denitrification filter pool, 6, a variable speed stirrer, 7, a stainless steel filter screen, 8, a hydrolysis acidification pool effluent weir, 9, a jet type effluent nozzle, 10, a sand storage pool, 11, a hydrolysis acidification pool water inlet pipe, 12, a hydrolysis acidification pool adjustable water inlet jet pump, 13, a hydrolysis acidification pool water inlet pipe valve, 14, a bacteria adding pipe, 15, a bacteria adding pipe valve, 16, a bacteria adding pump, 17, a filter pool sand discharging pipe, 18, a sand discharging pipe valve, 19 and a carbon source supplementing water inlet pipe, 20, a filter carbon source supplementing water inlet pipe valve, 21, a filter carbon source supplementing water inlet pump, 22, a carbon source supplementing uniform water distribution pipe, 23, a filter backwashing water outlet channel, 24, a filter water outlet channel, 25, biological filter materials, 26, a special filter head, 27, a secondary sedimentation tank water outlet weir, 28, a denitrification filter water inlet pipe, 29, a denitrification filter water inlet pump, 30, a denitrification filter water inlet pipe valve, 31, a backwashing air inlet pipe, 32, a backwashing water inlet pipe, 33, a filter normal water outlet pipe, 34, a filter backwashing water outlet pipe, 35, a sand feeder variable speed motor, 36 and a stirring paddle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in figure 1, the invention provides a device for improving denitrification and denitrification of wastewater, which comprises a hydrolysis acidification tank 1, a sand storage tank 10, a sludge digestion tank 3 and a denitrification filter tank 5, wherein a sand outlet of the sand storage tank 10 is communicated with one end of a variable speed spiral sand feeder 2, and the other end of the variable speed spiral sand feeder 2 is communicated with the tank wall of the hydrolysis acidification tank 1;
the hydrolysis acidification tank 1 is of an inverted cone-shaped closed structure, so that an anaerobic environment is kept in the tank, a hydrolysis acidification tank effluent weir 8 is arranged at the top end of the hydrolysis acidification tank, a stainless steel filter screen 7 is arranged on the outer side of the hydrolysis acidification tank effluent weir 8, and a sand outlet of the variable speed spiral sand feeder 2 is arranged close to the position under the stainless steel filter screen 7; a variable speed stirrer 6 is arranged in the middle inside the hydrolysis acidification tank 1; the bottom of the variable speed stirrer 6 is 0.5 meter away from the grit zone of the tank body of the hydrolysis acidification tank 1, and grid slag and grit in the tank are in a fluidized state through three sections of stirring paddles 36; the aperture of the stainless steel filter screen 7 is 1-2 mm, so that settled sand and grid slag in the tank can be effectively intercepted, and the safe operation of a subsequent water outlet pipeline and a structure is ensured.
The sludge digestion tank 3 is communicated with the hydrolysis acidification tank 1 through a bacterium adding pipe 14, and the bacterium adding pipe 14 is arranged right below the variable speed spiral sand feeder 2;
a water inlet pipe 11 of the hydrolysis acidification tank is connected with a normal water outlet pipe 33 of the denitrification filter, the effluent of the denitrification filter is pumped into the water inlet pipe 11 of the hydrolysis acidification tank through an adjustable water inlet jet pump 12, and jet type water outlet nozzles 9 are distributed on the water inlet pipe 11 of the hydrolysis acidification tank; the hydrolysis acidification tank effluent weir 8 is connected with a filter carbon source supplement water inlet pipe 19, and the other end of the filter carbon source supplement water inlet pipe 19 is communicated with the denitrification filter 5; the water discharged by the jet type water outlet nozzle 9 is in a jet form, so that the accumulation of settled sand at the bottom of the tank in the hydrolysis acidification process can be prevented, and organic matters on the surfaces of grid slag and settled sand can be effectively washed; the front end of the filter carbon source supplementing water inlet pipe 19 is connected with the hydrolysis acidification tank effluent weir 8, the filter carbon source supplementing water inlet pipe 19 is provided with a filter carbon source supplementing water inlet pipe valve 20, the filter carbon source supplementing water is pumped into the denitrification filter 5 through a filter carbon source supplementing water inlet pump 21, and the carbon source supplementing uniform water distribution pipe 22 in the filter can ensure uniform water distribution.
Furthermore, the reaction area above the hydrolysis acidification tank 1 is cylindrical, the sand discharge area below the hydrolysis acidification tank is conical, the gradient is designed to be 20 degrees, and sand discharge is facilitated; the sand feeding speed of the variable-speed spiral sand feeder 2 is adjustable and is controlled by a variable-speed motor 35 arranged at the top end of the variable-speed spiral sand feeder; the installation gradient of the variable speed spiral sand feeder 2 is 25 degrees, so that sand feeding is facilitated.
Further, the bacteria adding pipe 14 is provided with a bacteria adding pipe valve 15 and a bacteria adding pump 16, and the hydrolytic acidification bacteria in the sludge digestion tank 1 are pumped into the hydrolytic acidification tank 1 through the bacteria adding pump 16, namely the hydrolytic acidification tank 1 is inoculated with the bacteria which are selected from the hydrolytic acidification stage dominant bacteria, namely hydrolytic acidification bacteria, of the sludge digestion tank 3.
Further, a filter outlet channel 24 and a filter backwashing outlet channel 23 are respectively arranged at the top of the denitrification filter 5; the normal filter water discharge pipe 33 is communicated with the filter water outlet channel 24, and the filter backwashing water outlet channel 23 is connected with a filter backwashing water discharge pipe 34; and a biological filter material 25 is filled in the denitrification filter 5.
Further, the bottom of the denitrification filter 5 is connected with a back-flushing air inlet pipe 31 and a back-flushing water inlet pipe 32, the bottom of the denitrification filter 5 is also communicated with the secondary sedimentation tank 4 through a denitrification filter water inlet pipe 30, and a special filter head 26 is arranged at the joint of the denitrification filter water inlet pipe 30 and the denitrification filter 5.
Further, the sand discharge pipe 17 is located at the bottom of the hydrolysis acidification tank 1, the variable speed stirrer 6 and the adjustable water inlet jet pump 12 are closed during sand discharge, the sand discharge pipe valve 18 is opened after the grid slag and the settled sand settle at the bottom of the tank for sand discharge, and the pipe can also be used for emptying liquid in the tank.
The device for enhancing the grid slag and the sand setting hydrolysis acidification carbon release to improve the denitrification and nitrogen removal of the wastewater integrates sand feeding, water feeding, bacteria feeding, hydrolysis acidification reaction and water discharging, and enhances the nitrogen removal effect of the denitrification filter tank by utilizing the carbon source released by enhancing the grid slag and the hydrolysis acidification of the sand setting.
The working principle of the embodiment is as follows: a certain amount of considerable organic matters are adsorbed on the surfaces of the grid slag and the settled sand in the primary treatment stage of the water plant, and the grid slag and the settled sand enter a hydrolytic acidification tank through a spiral sand feeder and are inoculated with hydrolytic acidification bacteria from the hydrolytic acidification stage of the sludge digestion tank. The variable-speed stirrer and the jet-flow state water inflow in the tank can wash part of adsorbed organic matters off the surfaces of the grid slag and the sand setting, and the adsorbed and washed organic matters are hydrolyzed and acidified in the anaerobic environment in the tank to convert a macromolecular carbon source into a micromolecular carbon source which is easy to absorb and utilize by denitrifying bacteria. The outlet water of the hydrolysis acidification tank containing the carbon source supplement is pumped to a denitrification filter tank in the advanced treatment process, water is uniformly distributed through a water distribution pipeline at the bottom of the tank, the outlet water from a secondary sedimentation tank is supplemented with the carbon source at the bottom of the filter tank, and the outlet water of the secondary sedimentation tank after the carbon source supplement enters a biological filler area through a special filter head for denitrification.
Example two
The difference between the present embodiment and the first embodiment is: the rotating speed of the variable-speed spiral sand feeder 2 in the device is adjustable, and the adjusting range is 10-30 rad/min.
EXAMPLE III
The difference between the present embodiment and the first embodiment is: the power of the variable speed stirrer 6 in the device can be adjusted within the range of 100-200 rad/min.
By way of further illustration, the process of wastewater treatment using the above-described apparatus of the present invention mainly comprises the steps of:
1. water inflow of the hydrolysis acidification tank: the water inlet pipe 11 of the hydrolysis acidification tank is led from the normal water outlet pipe 33 of the denitrification filter 5, the water quality can reach the first-level A discharge standard of sewage, namely, the water use standard of the hydrolysis acidification tank 1 is met, and the water treated by a water plant is recycled;
2. feeding sand into a hydrolysis acidification tank: the sand fed into the hydrolysis acidification tank 1 comes from the grid slag of the grid in the primary treatment of the water plant and the settled sand in the grit chamber, and is carried into the hydrolysis acidification tank 1 by the propeller of the variable speed screw sand feeder 2, the experiment proves that 1g of the grid slag and the settled sand can obtain 1.5-2.25 mgCOD after hydrolysis acidification, and 1 ten thousand meters of COD is investigated for the sewage treatment plant 3 The sewage can generate 75-100 kg of grid slag and sand setting, the grid slag and sand setting can release considerable carbon after being hydrolyzed and acidified, and the released TN and TP are far less than the released COD;
3. feeding bacteria into a hydrolysis acidification pool: in order to strengthen the hydrolysis acidification effect of the grid slag and the sand setting, the hydrolysis acidification tank 1 can be properly introduced into the hydrolysis acidification stage of the sludge digestion tank 3, namely, the dominant strain, namely hydrolysis acidification bacteria; the concentration of the sludge inoculated in the hydrolysis acidification tank 1 is 40-80 mg/L;
4. hydrolysis acidification reaction: organic matters adsorbed on the grid slag and the settled sand are washed away under the stirring action of the variable speed stirrer 6 and the jet-flow water inflow action generated by the jet-flow water outflow nozzle 9, are hydrolyzed and acidified in an anaerobic environment, release a carbon source into water, convert a macromolecular carbon source into a micromolecular carbon source, and can be better utilized by denitrifying bacteria in the denitrifying filter 5; the hydraulic retention time of the hydrolysis acidification tank 1 is 12h;
5. water outlet of the hydrolysis acidification tank: the carbon source supplementing inlet water of the filter tank and the outlet water of the secondary sedimentation tank enter the denitrification filter tank 5, are uniformly mixed at the bottom of the tank and enter a biological filler area 25 through a special filter head 26;
6. enhanced denitrification denitrogenation: the effluent of the secondary sedimentation tank after carbon source supplement is subjected to denitrification in the biological filler area 25 to achieve a better denitrification effect.
The method of the embodiment integrates sand feeding, water feeding, bacteria feeding, hydrolytic acidification reaction and water discharging, and strengthens the hydrolytic acidification carbon release effect of the grid slag and the settled sand through the scouring action of the mechanical and water feeding and the inoculation of hydrolytic acidification bacteria;
the method can realize the effective utilization of the grid slag and the sand setting waste generated in the primary treatment stage of the sewage treatment plant, and changes waste into valuable;
the method provided by the embodiment provides a new idea for recycling the carbon source lost in the sewage treatment plant, can reduce the adding amount of the external carbon source by 10-20% in the sewage treatment plant, and can help the sewage treatment plant to save energy and reduce consumption;
the method can improve the current situation that the denitrification filter tank in the advanced treatment process of the sewage treatment plant has poor operation effect and is even abandoned due to insufficient carbon source of inlet water, and strengthens the biological denitrification process.
The above is only a preferred embodiment of the present technology, and the scope of the present technology is not limited to the above-mentioned embodiments, and all technical solutions that belong to the technical idea belong to the scope of the present technology. It should be noted that modifications and adaptations to those techniques may occur to one skilled in the art without departing from the principles of the present technique and are intended to be within the scope of the present technique. The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. A device for improving denitrification and denitrification of wastewater is characterized by comprising a hydrolysis acidification tank, a sand storage tank, a sludge digestion tank and a denitrification filter tank, wherein a sand outlet of the sand storage tank is communicated with one end of a variable speed spiral sand feeder, and the other end of the variable speed spiral sand feeder is communicated with the tank wall of the hydrolysis acidification tank;
the hydrolysis acidification tank is of an inverted-cone-shaped closed structure, the top end of the hydrolysis acidification tank is provided with a hydrolysis acidification tank effluent weir, the outer side of the hydrolysis acidification tank effluent weir is provided with a stainless steel filter screen, and the sand outlet of the variable-speed spiral sand feeder is arranged close to the position under the stainless steel filter screen; a variable speed stirrer is arranged in the middle inside the hydrolysis acidification tank;
the sludge digestion tank is communicated with the hydrolysis acidification tank through a bacterium adding pipe, and the bacterium adding pipe is arranged under the variable-speed spiral sand feeder;
a water inlet pipe of the hydrolysis acidification tank is connected with a normal drain pipe of the denitrification filter, the effluent of the denitrification filter is pumped into the water inlet pipe of the hydrolysis acidification tank through an adjustable water inlet jet pump, and jet type water outlet nozzles are distributed on the water inlet pipe of the hydrolysis acidification tank; the hydrolysis acidification pool effluent weir is connected with a filter carbon source supplement water inlet pipe, and the other end of the filter carbon source supplement water inlet pipe is communicated with the denitrification filter.
2. The apparatus for enhancing denitrification of wastewater according to claim 1, wherein: the upper reaction zone of the hydrolysis acidification tank is cylindrical, the lower sand discharge zone is conical, and the gradient is designed to be 20 degrees; the sand feeding speed of the variable-speed spiral sand feeder is adjustable and is controlled by a variable-speed motor arranged at the top end of the variable-speed spiral sand feeder; the installation gradient of the variable-speed spiral sand feeder is 25 degrees.
3. The apparatus for enhancing denitrification of wastewater according to claim 1, wherein: the bacteria adding pipe is provided with a bacteria adding pipe valve and a bacteria adding pump, and hydrolytic acidification bacteria in the sludge digestion tank are pumped into the hydrolytic acidification tank through the bacteria adding pump.
4. The apparatus for enhancing denitrification of wastewater according to claim 1, wherein: the top of the denitrification filter is respectively provided with a filter outlet channel and a filter backwashing outlet channel; the normal filter tank drainage pipe is communicated with the filter tank water outlet channel, and the filter tank backwashing water outlet channel is connected with a filter tank backwashing drainage pipe; and a biological filter material is filled in the denitrification filter.
5. The apparatus for enhancing denitrification of wastewater according to claim 4, wherein: the bottom of the denitrification filter tank is connected with a backwashing air inlet pipe and a backwashing water inlet pipe, the bottom of the denitrification filter tank is communicated with a secondary sedimentation tank through the denitrification filter tank water inlet pipe, and a special filter head is arranged at the joint of the denitrification filter tank water inlet pipe and the denitrification filter tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220316429.1U CN218231885U (en) | 2022-02-16 | 2022-02-16 | Device for improving denitrification of wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220316429.1U CN218231885U (en) | 2022-02-16 | 2022-02-16 | Device for improving denitrification of wastewater |
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| CN218231885U true CN218231885U (en) | 2023-01-06 |
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| CN202220316429.1U Active CN218231885U (en) | 2022-02-16 | 2022-02-16 | Device for improving denitrification of wastewater |
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