CN111689578A - Method and reactor for synchronously treating high-concentration ammonia nitrogen wastewater by culturing algae granular sludge - Google Patents
Method and reactor for synchronously treating high-concentration ammonia nitrogen wastewater by culturing algae granular sludge Download PDFInfo
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Abstract
The invention provides a method and a reactor for synchronously treating high-concentration ammonia nitrogen wastewater by culturing algae granular sludge, wherein the method for synchronously treating the high-concentration ammonia nitrogen wastewater by culturing the algae granular sludge comprises the following steps: enabling high-concentration ammonia nitrogen wastewater to enter a reactor, adding aerobic activated sludge and a first nitrogen-containing raw material into the reactor, and domesticating nitrosobacteria; adding a first carbon-containing raw material and a second nitrogen-containing raw material into the reactor, and domesticating denitrifying flora; and adding microalgae into the reactor, irradiating by lighting equipment, and adding a second carbon-containing raw material and a third nitrogen-containing raw material to enable the microalgae and the nitrosobacteria colony to be gathered and adhered to the denitrifying bacteria colony so as to finish the culture of the algae granular sludge. According to the invention, the high-concentration ammonia nitrogen wastewater is used for providing nutrients for the growth of nitrosobacteria and denitrifying bacteria, the growth of the nitrosobacteria and the denitrifying bacteria is accelerated, and the microalgae is added to reinforce the granular structure in the aerobic activated sludge and prevent the aerobic activated sludge from being disintegrated under the influence of the high ammonia nitrogen load of the high-concentration ammonia nitrogen wastewater.
Description
Technical Field
The embodiment of the invention relates to the technical field of sewage and wastewater treatment, in particular to a method and a reactor for synchronously treating high-concentration ammonia nitrogen wastewater by culturing algae granular sludge.
Background
With the improvement of the sludge treatment requirement, the anaerobic digestion process is applied to the reduction and stabilization treatment of the sludge of the sewage treatment plant more and more. However, a large amount of nitrogen is released in the anaerobic digestion process, so that the ammonia nitrogen concentration of the digested sludge dewatering liquid (the digested sludge dewatering liquid specifically comprises supernatant liquid of a sludge concentration tank and supernatant liquid of a sludge digestion tank) discharged in the anaerobic sludge treatment process is up to 500-1300mg/L, and the phosphate concentration is also up to 200 mg/L. Because the carbon-nitrogen ratio of the digested sludge dewatering liquid is low and the ammonia nitrogen load is high, the digested sludge dewatering liquid directly enters the urban sewage treatment plant, and the operation of the urban sewage treatment plant is obviously influenced.
At present, the discharge problem of the digested sludge dewatering liquid is mainly solved by an aerobic granular sludge technology, namely a nitrification and denitrification treatment mode is adopted. However, since the digested sludge-dehydrated liquid has a low carbon-nitrogen ratio and a high ammonia-nitrogen load, when the digested sludge-dehydrated liquid is treated by using the aerobic granular sludge technique, the aerobic granular sludge is easily disintegrated, so that the operating cost for treating the digested sludge-dehydrated liquid is high, the treatment period is long, and the practicability is insufficient.
Disclosure of Invention
Aiming at the problems of high operation cost, long treatment period and poor practicability of the conventional treatment method adopting the aerobic granular sludge technology, the embodiment of the invention provides a method and a reactor for culturing algae granular sludge and synchronously treating high-concentration ammonia nitrogen wastewater.
The technical scheme for solving the technical problems in the embodiment of the invention is to provide a method for culturing algae granular sludge and synchronously treating high-concentration ammonia nitrogen wastewater, which comprises the following steps:
a: enabling high-concentration ammonia nitrogen wastewater to enter a reactor, and adding aerobic activated sludge and a first nitrogen-containing raw material into the reactor to domesticate nitrosobacteria;
b: adding a first carbon-containing feedstock and a second nitrogen-containing feedstock to the reactor to acclimate the denitrifying bacteria population;
c: and adding microalgae into the reactor, irradiating by lighting equipment, and adding a second carbon-containing raw material and a third nitrogen-containing raw material according to a preset period to enable the microalgae and the nitrosobacteria to be gathered and adhered to the denitrifying bacteria to finish the culture of the algae granular sludge.
Preferably, the ammonia nitrogen concentration of the high-concentration ammonia nitrogen wastewater in the step a is more than 500 mg/L;
and b, injecting new high-concentration ammonia nitrogen wastewater into the reactor before adding the first carbon-containing raw material and the second nitrogen-containing raw material into the reactor, and adjusting the flow speed of the high-concentration ammonia nitrogen wastewater into the reactor.
Preferably, in the step c, the lighting equipment irradiates the high-concentration ammonia nitrogen wastewater in the reactor, the illumination intensity irradiated by the lighting equipment is 5000-10000lx, and the light-dark ratio is 0.5-2.
Preferably, in the step b, the aerobic activated sludge added in the reactor is flocculent aerobic activated sludge;
the following steps are also included between the steps b and c:
b 2: detecting the ammonia nitrogen concentration at the water outlet of the reactor through an ammonia nitrogen monitoring device;
b 3: the ammonia nitrogen concentration at the water outlet of the reactor is less than 70% of the ammonia nitrogen concentration of the high-concentration ammonia nitrogen wastewater, and the first nitrogen-containing raw material is added into the reactor;
b 4: adjusting the aeration period of the aeration device to enable the nitrosobacteria to be gathered and adhered to the denitrifying bacteria to form aerobic granular sludge.
Preferably, in step b4, the adjusted aeration period of the aeration device is as follows: after the aeration device is started for aeration for 1min, the aeration device stops aerating for 10 min; when the aeration device starts aeration, the dissolved oxygen concentration of the high-concentration ammonia nitrogen wastewater in the reactor is kept at 0.4-0.6 mg/L;
in the steps a to b, the hydraulic retention time in the reactor is 24 h; step b3 is followed by adjusting the hydraulic retention time in the reactor to 18 h.
Preferably, in the step a, the first nitrogen-containing raw material added comprises ammonium chloride with the nitrogen concentration of 400-800 mg/L;
in the step b, the added first carbon-containing raw material comprises a micromolecular mixed carbon source with the concentration of 400-;
in the step c, the added second carbon-containing raw material comprises a small molecule mixed carbon source, and the added third nitrogen-containing raw material comprises ammonium chloride.
Preferably, the step a comprises adjusting the pH value of the high-concentration ammonia nitrogen wastewater in the reactor to 7.5-8.5 and the temperature to 25-32 ℃;
the step b comprises the steps of adjusting the pH value of the high-concentration ammonia nitrogen wastewater in the reactor to be 7.5-8.0 and the temperature to be 25-30 ℃, and aerating by an aeration device to ensure that the dissolved oxygen concentration of the high-concentration ammonia nitrogen wastewater in the reactor is 0.3-0.6 mg/L;
and the step c comprises adjusting the pH value of the high-concentration ammonia nitrogen wastewater in the reactor to 7.0-8.0 and the temperature to 25-30 ℃, and aerating by an aeration device to ensure that the dissolved oxygen concentration of the high-concentration ammonia nitrogen wastewater in the reactor is 0.4-0.8 mg/L.
Preferably, the steps a and b respectively include: the temperature of the high-concentration ammonia nitrogen wastewater in the reactor is adjusted through a heating device, and the pH value of the high-concentration ammonia nitrogen wastewater in the reactor is adjusted through adding potassium bicarbonate.
Preferably, in the step c, the microalgae is Scenedesmus obliquus with an OD680 concentration range of 25 g/L.
The embodiment of the invention also provides a reactor used in the method for culturing algae particle sludge and synchronously treating high-concentration ammonia nitrogen wastewater, which comprises lighting equipment, an ammonia nitrogen monitoring device, an aeration device and a hollow cylindrical main body, wherein: the aeration device is arranged at the bottom of the cylindrical main body; the cylindrical main body comprises a water inlet and a water outlet, and the ammonia nitrogen monitoring device is arranged at the water outlet of the cylindrical main body; the cylindrical body is made of a transparent material, and the lighting equipment is arranged outside the cylindrical body in a mode of surrounding the periphery of the cylindrical body; the cylindrical body is cylindrical, and the diameter-height ratio of the cylindrical body is less than or equal to 1: 3.
The method and the reactor for synchronously treating high-concentration ammonia nitrogen wastewater by culturing the algae granular sludge have the following beneficial effects: by using the high-concentration ammonia nitrogen wastewater, rich nutrients for growth are effectively provided for nitrosobacteria and denitrifying bacteria in the aerobic activated sludge, so that the activity of the nitrosobacteria and the denitrifying bacteria is ensured, the growth speed of the nitrosobacteria and the denitrifying bacteria is accelerated, the formation of a granular structure by the aerobic activated sludge is facilitated, the granular structure is more stable and is not easy to run off, and the denitrification capability of the high-concentration ammonia nitrogen wastewater is enhanced; in addition, the microalgae is added, so that the microalgae grows and is clustered and attached with the nitrosobacteria and the denitrifying bacteria to form the algae granular sludge, the problem that the microalgae is easy to run off is solved, the granular structure in the aerobic activated sludge can be reinforced, the decomposition caused by the influence of high ammonia nitrogen load of the high-concentration ammonia nitrogen wastewater is prevented, the growth speed of the aerobic granular sludge is effectively accelerated, the treatment effect on the high-concentration ammonia nitrogen wastewater is improved, the operation cost is greatly reduced, and the treatment period is shortened; by adding the first nitrogen-containing raw material, the second nitrogen-containing raw material and the first carbon-containing raw material, a more favorable growth environment can be provided for nitrosobacteria and denitrifying bacteria, the domestication of nitrosobacteria and denitrifying bacteria is accelerated, and the problem of low carbon-nitrogen ratio in high-concentration ammonia nitrogen wastewater is effectively solved.
Drawings
FIG. 1 is a flow chart of a method for culturing algae granule sludge and synchronously treating high-concentration ammonia nitrogen wastewater provided by the embodiment of the invention;
FIG. 2 is a schematic structural diagram of a reactor provided in an embodiment of the present invention;
FIG. 3 is another flow chart of the method for culturing algae granule sludge and synchronously treating high-concentration ammonia nitrogen wastewater provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the method for synchronously treating high-concentration ammonia nitrogen wastewater by culturing algae granular sludge according to an embodiment of the present invention is a schematic diagram, and the method for synchronously treating high-concentration ammonia nitrogen wastewater by culturing algae granular sludge can be applied to the technical field of sewage or wastewater treatment, especially in the treatment of sewage or wastewater with high-concentration ammonia nitrogen, such as piggery biogas slurry wastewater, digested sludge dewatering liquid (specifically, digested sludge dewatering liquid includes supernatant of a sludge concentration tank and supernatant of a sludge digestion tank) generated in an anaerobic digestion process, and the like.
Referring to fig. 2, the reactor 1 shown in fig. 2 can be used in the method for culturing algae granule sludge and synchronously treating high-concentration ammonia nitrogen wastewater in the present embodiment. Specifically, the method comprises the following steps:
s10: high-concentration ammonia nitrogen wastewater enters an inner cavity 101 of the cylindrical body 11 from a water inlet 111 (namely, a granulation area formed by the inner cavity 101 and used for forming algae granular sludge), and then aerobic activated sludge and a first nitrogen-containing raw material are added into the inner cavity 101 of the cylindrical body 11 through a medicine adding port 112 so as to domesticate nitrosation flora in the aerobic activated sludge.
In the embodiment of the invention, the aerobic activated sludge can be flocculent aerobic activated sludge, and the high-concentration ammonia nitrogen wastewater can be synchronously treated while the operation cost is reduced. Of course, in practical application, the aerobic granular sludge can also be directly added, and the method can be determined according to practical conditions.
The high-concentration ammonia nitrogen wastewater is specifically pig farm biogas slurry wastewater or digested sludge dewatering liquid (containing sludge concentration tank supernatant and sludge digestion tank supernatant) generated in an anaerobic digestion process, the ammonia nitrogen concentration of the wastewater is high, so that abundant nutrients for growth can be provided for microorganisms, the reliable growth and formation of algae granular sludge are guaranteed, and the high-concentration ammonia nitrogen wastewater is purified and treated. However, the high-concentration ammonia nitrogen wastewater has low carbon-nitrogen ratio and high ammonia nitrogen load, and can not directly enter a municipal sewage treatment plant generally, so the method provided by the embodiment can effectively solve the problem of discharge of the high-concentration ammonia nitrogen wastewater.
The first nitrogen-containing raw material specifically comprises ammonium chloride with the nitrogen concentration of 400-800mg/L, so that the content of nutrients required by growth of nitrosobacteria in the aerobic activated sludge can be effectively improved, the activity of the nitrosobacteria in the aerobic activated sludge is ensured, and the nitrosation capacity of the aerobic activated sludge is enhanced. Moreover, after the aerobic activated sludge is added, the pH value of the high-concentration ammonia nitrogen wastewater in the inner cavity 101 of the cylindrical main body 11 is preferably adjusted to be 7.5-8.5, the temperature is 25-32 ℃, so that a favorable growth environment can be provided for nitrosobacteria in the aerobic activated sludge, the activity of the nitrosobacteria is avoided being inhibited, the growth speed of the nitrosobacteria in the aerobic activated sludge is accelerated, and then the nitrosobacteria in a particle structure are formed by gathering and attaching together, so that the formation of the algae particle sludge is facilitated.
S20: the first carbon-containing raw material and the second nitrogen-containing raw material are added into the inner cavity 101 of the cylindrical body 11 through the medicine adding port 112 so as to domesticate the denitrifying bacteria in the aerobic activated sludge. The first carbon-containing raw material specifically comprises a micromolecular mixed carbon source with the concentration of 400-400 mg/L, and the second nitrogen-containing raw material specifically comprises potassium nitrite with the nitrogen concentration of 200-400mg/L, so that the carbon-nitrogen ratio of the high-concentration ammonia nitrogen wastewater in the inner cavity 101 is adjusted, nutrients required for growth are provided for denitrifying bacteria in the aerobic activated sludge, the activity of denitrifying bacteria is ensured, and the denitrifying capability of the aerobic activated sludge is enhanced.
Preferably, after the first carbon-containing raw material and the second nitrogen-containing raw material are added, the pH value of the high-concentration ammonia nitrogen wastewater in the inner cavity 101 is adjusted to be 7.5-8.0, the temperature is 25-30 ℃, then the aeration device 14 positioned at the bottom of the inner cavity 101 is started, the aeration device 14 aerates the high-concentration ammonia nitrogen wastewater in the inner cavity 101, and the dissolved oxygen concentration of the high-concentration ammonia nitrogen wastewater is 0.3-0.6mg/L, so that a favorable growth environment can be provided for nitrosobacteria in the aerobic activated sludge, the activity of the denitrifying bacteria is prevented from being inhibited, the growth speed of the denitrifying bacteria in the aerobic activated sludge is accelerated, the denitrifying bacteria are aggregated and adhered together to form a granular denitrifying bacteria colony, the denitrifying capability of the aerobic activated sludge is further enhanced, the loss of the denitrifying bacteria is also avoided, and the formation of the algae granular sludge is facilitated.
S30: microalgae is added into the inner cavity 101 of the cylindrical main body 11 through the chemical adding port 112, then the microalgae is irradiated by the light device 12 (such as an LED lamp), and then a second carbon-containing raw material and a third nitrogen-containing raw material are added into the high-concentration ammonia nitrogen wastewater in the inner cavity 101 according to a preset period, so that the microalgae and nitrosobacteria groups are gathered and adhered to the denitrifying bacteria groups, and the culture of the algae granular sludge is completed. In practical application, the preset period for adding the second carbon-containing raw material and the third nitrogen-containing raw material can be specifically adjusted according to actual conditions.
The cylindrical body 11 is made of transparent materials (such as organic glass), the lighting equipment 12 is arranged on the periphery of the cylindrical body 11 and irradiates the high-concentration ammonia nitrogen wastewater in the inner cavity 101 of the cylindrical body 11, so that the illumination is improved for the microalgae in the high-concentration ammonia nitrogen wastewater, the microalgae further grow through photosynthesis, nitrogen and phosphorus in the high-concentration ammonia nitrogen wastewater are removed, and efficient nitrogen and phosphorus removal is realized.
In practical application, the light intensity of the lighting device 12 is preferably 5000-10000lx, and the light-dark ratio is 0.5-2, so that the stable photosynthesis of the microalgae can be ensured, the granulation culture of the algae granular sludge is accelerated, and the nitrogen and phosphorus removal capability of the algae granular sludge is improved.
According to the method for synchronously treating the high-concentration ammonia nitrogen wastewater by culturing the algae granular sludge, the high-concentration ammonia nitrogen wastewater is used, rich nutrients for growth are effectively provided for nitrosobacteria and denitrifying bacteria in the aerobic activated sludge, so that the activity of the nitrosobacteria and the denitrifying bacteria is ensured, the growth speed of the nitrosobacteria and the denitrifying bacteria is accelerated, the aerobic activated sludge is facilitated to form a granular structure, the granular structure is more stable and is not easy to run off, and the denitrification capability of the high-concentration ammonia nitrogen wastewater is enhanced.
In addition, the method also adds the microalgae, so that the microalgae grows and is gathered and attached with the nitrosobacteria group and the denitrifying bacteria group to form the algae granular sludge, thereby solving the problem that the microalgae is easy to run off, reinforcing the granular structure in the aerobic activated sludge, preventing the microalgae from being disintegrated by the influence of high ammonia nitrogen load of the high-concentration ammonia nitrogen wastewater (namely enhancing the structural strength of the algae granular sludge, being difficult to disintegrate, ensuring the nitrification and denitrification capability of the high-concentration ammonia nitrogen wastewater), effectively accelerating the growth speed of the aerobic granular sludge, improving the treatment effect of the high-concentration ammonia nitrogen wastewater, further greatly reducing the operation cost, shortening the treatment period and having higher practicability.
Specifically, the second carbon-containing raw material added in step S30 specifically includes a small molecule mixed carbon source, and the third nitrogen-containing raw material specifically includes ammonium chloride, so as to adjust the carbon-nitrogen ratio of the high-concentration ammonia-nitrogen wastewater in the inner cavity 101 of the cylindrical main body 11, provide nutrients required for growth of the microalgae, the nitrosobacteria group and the denitrification bacteria group, and have higher activity, thereby accelerating the granular culture of the algae granular sludge.
In order to ensure the reliable growth and formation of the algae granule sludge, the ammonia nitrogen concentration of the high-concentration ammonia nitrogen wastewater in the step S10 is preferably more than 500 mg/L.
The step S20 further includes injecting new high-concentration ammonia nitrogen wastewater into the inner cavity 101 before adding the first carbon-containing raw material and the second nitrogen-containing raw material into the high-concentration ammonia nitrogen wastewater in the inner cavity 101, and adjusting the flow speed of the high-concentration ammonia nitrogen wastewater into the inner cavity 101 to control the hydraulic retention time in the inner cavity 101, so as to avoid the loss of aerobic activated sludge, and the injection of the new high-concentration ammonia nitrogen wastewater into the inner cavity 101 can improve sufficient nutrients for denitrifying bacteria, so as to reduce the operation cost.
As shown in fig. 3, the following steps are further included between steps S20 and S30:
s21: the ammonia nitrogen concentration at the water outlet 113 of the cylindrical main body 11 is detected through the ammonia nitrogen monitoring device 13, namely the ammonia nitrogen concentration of the high-concentration ammonia nitrogen wastewater flowing out through the water outlet 113 is detected, so that the ammonia nitrogen concentration of the high-concentration ammonia nitrogen wastewater at the water outlet 113 is obtained in real time.
S22: when the ammonia nitrogen monitoring device 13 detects that the ammonia nitrogen concentration at the water outlet 113 is kept less than 70% of the ammonia nitrogen concentration of the high-concentration ammonia nitrogen wastewater added in the step S10, adding a first nitrogen-containing raw material to the high-concentration ammonia nitrogen wastewater in the inner cavity 101.
S23: the aeration period of the aeration device 14 is adjusted so that the nitrosobacteria colony is gathered and adhered to the denitrifying bacteria colony to form aerobic granular sludge.
Specifically, in step S23, the aeration period of the aeration device 14 after adjustment is: after the aeration of the aeration device 14 is started for 1min, the aeration device 14 stops aerating for 10min, namely, after the aeration is started for 1min, the aeration is stopped for 10min, and the circulation is carried out. Therefore, the dissolved oxygen amount of the high-concentration ammonia nitrogen wastewater in the inner cavity 101 can be controlled, and the flowing state of aerobic sludge particles can be adjusted to accelerate the granulation process of the aerobic granular sludge. Of course, the aeration period of the aeration device 14 can be specifically adjusted according to actual conditions.
In practical application, preferably, when the aeration device 14 starts aeration, the dissolved oxygen concentration of the high-concentration ammonia nitrogen wastewater in the inner cavity 101 is kept at 0.4-0.6mg/L, so as to ensure the activity of nitrosobacteria (nitrosobacteria are aerobic microorganisms), promote the accumulation of the nitrosobacteria to adhere to the denitrifying bacteria, and accelerate the growth of aerobic granular sludge.
To prevent the aerobic activated sludge from being lost, the hydraulic retention time in the inner cavity 101 of the cylindrical body 11 is 24 hours in steps S10 to S20. In addition, after step S23, the hydraulic retention time in the inner cavity 101 of the cylindrical body 11 may be adjusted to 18 hours to accelerate the adjustment of the flow state of the granular structure in the aerobic activated sludge, so as to change the colony structure of the granular aerobic activated sludge, so as to strengthen the strength of the granular structure of the aerobic granular sludge, and make the aerobic granular sludge have higher anti-disintegration capability.
In an embodiment of the present invention, the step S30 further includes adjusting the pH of the high concentration ammonia nitrogen wastewater in the inner cavity 101 to 7.0-8.0 and the temperature to 25-30 ℃ after adding the second carbon-containing raw material and the third nitrogen-containing raw material to the high concentration ammonia nitrogen wastewater in the inner cavity 101, and aerating by the aeration device 14 to make the dissolved oxygen concentration of the high concentration ammonia nitrogen wastewater in the inner cavity 101 to be 0.4-0.8mg/L, so as to provide a favorable growth environment for the microalgae, the nitrosobacteria and the denitrifying bacteria, prevent the activity of the microalgae, the nitrosobacteria and the denitrifying bacteria from being inhibited by environmental factors, and ensure the stable growth of the algae granule sludge.
In practical application, the temperature of the high-concentration ammonia nitrogen wastewater in the inner cavity 101 can be controlled by additionally arranging a heating device at the bottom of the cylindrical main body 11, and the pH value of the high-concentration ammonia nitrogen wastewater can be adjusted by adding potassium bicarbonate.
In another embodiment of the present invention, the microalgae added in the inner cavity 101 of the cylindrical body 11 in step S30 is Scenedesmus obliquus with an OD680 concentration range of 25 g/L.
As shown in figure 2, the invention also provides a reactor 1 used in the method for culturing the algae granular sludge and synchronously treating the high-concentration ammonia nitrogen wastewater, wherein the reactor 1 comprises a lighting device 12, an ammonia nitrogen monitoring device 13, an aeration device 14 and a hollow cylindrical main body 11, and a hollow inner cavity 101 of the cylindrical main body 11 forms a granulation area for forming and growing the algae granular sludge.
Specifically, the aeration device 14 is installed at the bottom of the inner cavity 101 of the cylindrical main body 11 to aerate the high-concentration ammonia nitrogen wastewater in the inner cavity 101, adjust the dissolved oxygen amount of the high-concentration ammonia nitrogen wastewater and change the flow state of aerobic activated sludge in the high-concentration ammonia nitrogen wastewater.
The cylindrical body 11 comprises a water inlet 111, a dosing port 112 and a water outlet 113, wherein the dosing port 112 is located at the top of the cylindrical body 11, and the ammonia nitrogen monitoring device 13 is installed at the water outlet 113 of the cylindrical body 11 to detect the ammonia nitrogen concentration of the high-concentration ammonia nitrogen wastewater flowing out through the water outlet 113. In particular, the cylindrical body 11 is made of a transparent material (e.g., organic glass), and the lighting device 12 is installed outside the cylindrical body 11 in a manner of surrounding the outer circumference of the cylindrical body 11, so that the lighting device 12 can uniformly irradiate the cylindrical body 11 and irradiate microalgae in the high-concentration ammonia nitrogen wastewater in the inner cavity 101 through the cylindrical body 11.
The cylindrical body 11 is cylindrical, and in practical applications, the ratio of the diameter to the height of the cylindrical body 11 is preferably less than or equal to 1:3, so that the cylindrical body 11 has a larger height dimension. Further, the dosing port 112 is located at the top of the cylindrical main body 11, so that the cylindrical main body 11 has a larger height, microalgae can be in contact with nitrosobacteria and denitrifying bacteria in high-concentration ammonia nitrogen wastewater for a longer time, and the formation of algae granular sludge is accelerated. In practical applications, the specific size of the aspect ratio of the cylindrical body 11 needs to be determined according to practical situations.
In addition, the reactor 1 further comprises a DO online monitoring device 15, and a detection head of the DO online monitoring device 15 is fixedly connected to the top of the cylindrical main body 11 and inserted into the inner cavity 101 of the cylindrical main body 11, so as to obtain the dissolved oxygen amount of the high-concentration ammonia nitrogen wastewater in the inner cavity 101 in real time, and improve the controllability and convenience of the use operation.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for culturing algae granular sludge and synchronously treating high-concentration ammonia nitrogen wastewater is characterized by comprising the following steps:
a: enabling high-concentration ammonia nitrogen wastewater to enter a reactor, and adding aerobic activated sludge and a first nitrogen-containing raw material into the reactor to domesticate nitrosobacteria;
b: adding a first carbon-containing feedstock and a second nitrogen-containing feedstock to the reactor to acclimate the denitrifying bacteria population;
c: and adding microalgae into the reactor, irradiating by lighting equipment, and adding a second carbon-containing raw material and a third nitrogen-containing raw material according to a preset period to enable the microalgae and the nitrosobacteria to be gathered and adhered to the denitrifying bacteria to finish the culture of the algae granular sludge.
2. The method for synchronously treating high-concentration ammonia nitrogen wastewater by culturing the algal granule sludge according to claim 1, wherein the ammonia nitrogen concentration of the high-concentration ammonia nitrogen wastewater in the step a is more than 500 mg/L;
and b, injecting new high-concentration ammonia nitrogen wastewater into the reactor before adding the first carbon-containing raw material and the second nitrogen-containing raw material into the reactor, and adjusting the flow speed of the high-concentration ammonia nitrogen wastewater into the reactor.
3. The method for culturing algae particle sludge and synchronously treating high-concentration ammonia nitrogen wastewater according to claim 1, wherein in the step c, the lighting equipment irradiates the high-concentration ammonia nitrogen wastewater in the reactor, the illumination intensity irradiated by the lighting equipment is 5000-10000lx, and the light-dark ratio is 0.5-2.
4. The method for synchronously treating high-concentration ammonia nitrogen wastewater by culturing the algae particle sludge according to claim 1, wherein in the step b, the aerobic activated sludge added into the reactor is flocculent aerobic activated sludge;
the following steps are also included between the steps b and c:
b 2: detecting the ammonia nitrogen concentration at the water outlet of the reactor through an ammonia nitrogen monitoring device;
b 3: the ammonia nitrogen concentration at the water outlet of the reactor is less than 70% of the ammonia nitrogen concentration of the high-concentration ammonia nitrogen wastewater, and the first nitrogen-containing raw material is added into the reactor;
b 4: adjusting the aeration period of the aeration device to enable the nitrosobacteria to be gathered and adhered to the denitrifying bacteria to form aerobic granular sludge.
5. The method for synchronously treating high-concentration ammonia nitrogen wastewater by culturing the algal granule sludge as claimed in claim 4, wherein in the step b4, the aeration period of the aeration device after adjustment is as follows: after the aeration device is started for aeration for 1min, the aeration device stops aerating for 10 min; when the aeration device starts aeration, the dissolved oxygen concentration of the high-concentration ammonia nitrogen wastewater in the reactor is kept at 0.4-0.6 mg/L;
in the steps a to b, the hydraulic retention time in the reactor is 24 h; step b3 is followed by adjusting the hydraulic retention time in the reactor to 18 h.
6. The method for synchronously treating high-concentration ammonia nitrogen wastewater by culturing the algal granule sludge as claimed in claim 1, wherein the first nitrogen-containing raw material added in the step a comprises ammonium chloride with nitrogen concentration of 400-800 mg/L;
in the step b, the added first carbon-containing raw material comprises a micromolecular mixed carbon source with the concentration of 400-;
in the step c, the added second carbon-containing raw material comprises a small molecule mixed carbon source, and the added third nitrogen-containing raw material comprises ammonium chloride.
7. The method for culturing the algal grain sludge to synchronously treat the high-concentration ammonia-nitrogen wastewater according to claim 1, wherein the step a comprises adjusting the pH value of the high-concentration ammonia-nitrogen wastewater in the reactor to 7.5-8.5 and the temperature to 25-32 ℃;
the step b comprises the steps of adjusting the pH value of the high-concentration ammonia nitrogen wastewater in the reactor to be 7.5-8.0 and the temperature to be 25-30 ℃, and aerating by an aeration device to ensure that the dissolved oxygen concentration of the high-concentration ammonia nitrogen wastewater in the reactor is 0.3-0.6 mg/L;
and the step c comprises adjusting the pH value of the high-concentration ammonia nitrogen wastewater in the reactor to 7.0-8.0 and the temperature to 25-30 ℃, and aerating by an aeration device to ensure that the dissolved oxygen concentration of the high-concentration ammonia nitrogen wastewater in the reactor is 0.4-0.8 mg/L.
8. The method for synchronously treating high-concentration ammonia nitrogen wastewater by culturing the algal granule sludge according to claim 7, wherein the steps a and b respectively comprise: the temperature of the high-concentration ammonia nitrogen wastewater in the reactor is adjusted through a heating device, and the pH value of the high-concentration ammonia nitrogen wastewater in the reactor is adjusted through adding potassium bicarbonate.
9. The method for synchronously treating high-concentration ammonia nitrogen wastewater by culturing the algae granule sludge according to any one of claims 1-8, wherein in the step c, the microalgae are Scenedesmus obliquus with an OD680 concentration range of 25 g/L.
10. A reactor used in the method for culturing algae particle sludge and synchronously treating high-concentration ammonia nitrogen wastewater according to any one of claims 1 to 9, wherein the reactor comprises a light device, an ammonia nitrogen monitoring device, an aeration device and a hollow cylindrical body, wherein: the aeration device is arranged at the bottom of the cylindrical main body; the cylindrical main body comprises a water inlet and a water outlet, and the ammonia nitrogen monitoring device is arranged at the water outlet of the cylindrical main body; the cylindrical body is made of a transparent material, and the lighting equipment is arranged outside the cylindrical body in a mode of surrounding the periphery of the cylindrical body; the cylindrical body is cylindrical, and the diameter-height ratio of the cylindrical body is less than or equal to 1: 3.
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| CN105692884A (en) * | 2016-03-18 | 2016-06-22 | 南开大学 | Aerobic granule sludge cultivation method based on helotism |
| CN106219871A (en) * | 2016-08-09 | 2016-12-14 | 重庆大学 | A kind of livestock breeding wastewater processing method |
| CN108117158A (en) * | 2016-11-29 | 2018-06-05 | 中国石油化工股份有限公司 | A kind of fast culture process of nitrogen removal granule sludge |
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| CN105692884A (en) * | 2016-03-18 | 2016-06-22 | 南开大学 | Aerobic granule sludge cultivation method based on helotism |
| CN106219871A (en) * | 2016-08-09 | 2016-12-14 | 重庆大学 | A kind of livestock breeding wastewater processing method |
| CN108117158A (en) * | 2016-11-29 | 2018-06-05 | 中国石油化工股份有限公司 | A kind of fast culture process of nitrogen removal granule sludge |
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