CN112979075A - Zero-carbon-source-added biogas slurry denitrification method and application thereof - Google Patents
Zero-carbon-source-added biogas slurry denitrification method and application thereof Download PDFInfo
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Abstract
The invention provides a zero-carbon-source-added biogas slurry denitrification method and application thereof, and relates to the technical field of sewage treatment. Firstly, carrying out short-cut nitrification on anaerobically digested biogas slurry to obtain nitrosated biogas slurry, and converting ammonia nitrogen in the biogas slurry into nitrite nitrogen; then mixing the sludge subjected to anaerobic digestion with the nitrosation biogas slurry for denitrification, wherein nitrite nitrogen in the mixed solution is converted into nitrogen by utilizing the own carbon source and temperature of the raw materials; due to denitrification, an internal carbon source in the sludge is released and consumed, the original structure of the sludge is damaged, the dehydration performance of the sludge is improved, and the solid-liquid separation effect of mixed liquid is enhanced; and finally, discharging the biogas slurry part obtained by solid-liquid separation, and repeatedly performing the denitrification process after partial biogas slurry is subjected to short-cut nitrification, so that the ammonia nitrogen content is further reduced.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a zero carbon source adding biogas slurry denitrification method and application thereof.
Background
The anaerobic digestion is used as a mainstream technology for urban organic waste treatment, realizes harmless and stable treatment of organic waste, and can generate a large amount of high-quality bioenergy, thereby not only improving the ecological environment, but also relieving the dilemma that non-renewable energy sources such as petroleum and natural gas are increasingly poor. Although the anaerobic digestion system can perform high-efficiency decarburization, nitrogen is accumulated in the system and is usually presented in an ammonia nitrogen form, so that the ammonia nitrogen concentration of the biogas slurry is high, the C/N ratio is low, and the biodegradability is poor.
At present, the traditional biological denitrification technology is the most widely applied biogas slurry denitrification technology, namely total nitrogen removal is realized through nitrification-denitrification, an adequate carbon source and high-activity nitrification and denitrification bacteria are the key of the technology, the lower carbon-nitrogen ratio of the biogas slurry cannot meet the requirement of the system on the organic carbon source, an expensive carbon source needs to be additionally added to ensure the denitrification effect, organic resources are wasted, the burden of the overall ecological environment is increased, the operation cost of anaerobic digestion is increased, and the economic benefit is reduced. Although the anaerobic ammonia oxidation technology can remove ammonia nitrogen without adding a carbon source, the anaerobic ammonia oxidation bacteria are slow in production, long in generation period, sensitive to the external environment, and difficult to start and operate and control the anaerobic ammonia oxidation technology, and the short plates limit the engineering application of the anaerobic ammonia oxidation technology. Therefore, the efficient, simple and cheap realization of the removal of the total nitrogen in the biogas slurry is the bottleneck problem of the development of the current anaerobic digestion process.
The invention discloses a device and a method for single-stage autotrophic biological denitrification of low-CN high-ammonia-nitrogen wastewater (with the patent number of CN201110004481.X), which adopts a process of shortcut nitrification and anaerobic ammonia oxidation, wherein the shortcut nitrification and the anaerobic ammonia oxidation are reacted in the same reactor, the inhibition effect of ammonia nitrogen and nitrite nitrogen concentration on anaerobic ammonia oxidizing bacteria is stronger, the control of process parameters is more complex, and the risk of reaching the standard for inexperienced operators is higher.
The invention discloses a method for denitrifying live pig breeding wastewater biogas slurry (with the patent number of CN201610765504.1), which realizes the removal of ammonia nitrogen by sequentially adding three medicaments, namely CaO inorganic matter, a mixture of polyethylene glycol-200 and polyethylene glycol-400 and anionic polyacrylamide.
The invention discloses a high-efficiency in-situ biogas slurry denitrification method for anaerobic digestion of sludge (with the patent number of CN201810037890.1), which is characterized in that biogas slurry is nitrosated, then is mixed with dewatered sludge for denitrification, and is conveyed to an anaerobic digestion system after denitrification to complete an anaerobic digestion gas production process. Compared with the sludge after anaerobic digestion, the dewatered sludge has low denitrifying bacteria activity, so the residence time of denitrification is longer, the occupied area is larger, meanwhile, the nitrite nitrogen remained in the denitrification process has serious inhibition effect on the methanogen activity in an anaerobic digestion system, and the anaerobic digestion acidification risk is increased.
However, the above methods have problems or disadvantages.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a biogas slurry denitrification method with zero carbon source addition, so as to solve at least one of the problems.
The second purpose of the invention is to provide the application of the biogas slurry denitrification method with zero carbon source addition in the field of sewage treatment.
In a first aspect, the application provides a biogas slurry denitrification method, which comprises the following steps:
a. performing short-cut nitrification on the biogas slurry subjected to anaerobic digestion to obtain nitrosation biogas slurry;
b. mixing the sludge subjected to anaerobic digestion with the nitrosation biogas slurry for denitrification;
c. c, carrying out solid-liquid separation on the mixed solution obtained after denitrification in the step b;
and c, after the step c is finished, discharging a biogas slurry part obtained by solid-liquid separation, returning the part to the step b after the part is subjected to short-cut nitrification, and repeating the step b and the step c to finish denitrification treatment.
As a further technical scheme, the biogas slurry after anaerobic digestion comprises at least one of biogas slurry after sludge anaerobic digestion, biogas slurry after livestock and poultry manure anaerobic digestion or biogas slurry after kitchen waste anaerobic digestion.
As a further technical scheme, the ammonia nitrogen content of the anaerobic digested biogas slurry is 600-3000 mg/L;
as a further technical scheme, the short-cut nitrification comprises aeration;
preferably, the dissolved oxygen in the biogas slurry in the short-cut nitrification is controlled to be 0.3-0.5 mg/L;
preferably, the time of the short-cut nitrification is 8-24 h.
As a further technical scheme, the solid content of the sludge after anaerobic digestion is 5-10 wt%, preferably 8 wt%;
preferably, the temperature of the sludge after anaerobic digestion is 35-45 ℃.
As a further technical scheme, the volume ratio of the sludge subjected to anaerobic digestion to the biogas slurry subjected to nitrosation is (1:1) - (3: 1).
As a further technical scheme, the temperature of the sludge subjected to anaerobic digestion and the biogas slurry subjected to nitrosation after mixing is 30-35 ℃.
As a further technical scheme, denitrification is carried out under the condition of stirring;
preferably, the rotating speed of the stirring is 80-120 r/min, and preferably 100 r/min;
preferably, the manner of stirring includes batch stirring;
preferably, the batch agitation comprises: stirring for 8-12min, stopping stirring for 16-24min, preferably 10min, and stopping stirring for 20 min.
As a further technical scheme, the denitrification time is 32-48 h.
In a second aspect, the application provides an application of a biogas slurry denitrification method in the field of sewage treatment.
Compared with the prior art, the invention has the following beneficial effects:
1. firstly, carrying out short-cut nitrification on anaerobically digested biogas slurry to obtain nitrosated biogas slurry, and converting ammonia nitrogen in the biogas slurry into nitrite nitrogen; then mixing the sludge subjected to anaerobic digestion with the nitrosation biogas slurry for denitrification, wherein nitrite nitrogen in the mixed solution is converted into nitrogen by utilizing the self-temperature of the raw materials without heating; and finally, discharging the biogas slurry part obtained by solid-liquid separation, and repeatedly performing the denitrification process after partial biogas slurry is subjected to short-cut nitrification, so that the ammonia nitrogen content is further reduced.
2. According to the biogas slurry denitrification method provided by the invention, the denitrification process utilizes the temperature of anaerobic digested sludge, aeration and heating are not needed, and the operation is simple, easy and controllable; the residual volatile fatty acid of the sludge after anaerobic digestion is relatively sufficient with an internal carbon source, when the sludge is used for denitrification, no additional carbon source is needed to be added, the sludge is more easily utilized by denitrifying bacteria, the reaction rate is high, the retention time is short, the occupied area is small, and the capital construction and operation cost is saved; the sludge subjected to anaerobic digestion is mixed with the short-cut nitrified biogas slurry for denitrification, the original structure of the sludge is destroyed, the release of an inner carbon source is enhanced, the requirement of a denitrification carbon source is met, the rapid denitrification is realized, the dehydration performance of the sludge is obviously improved, and the subsequent dehydration cost is reduced.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows the content change of nitrogen in various valence states during the sludge denitrification biogas slurry provided by the embodiment 1 of the invention;
FIG. 2 shows the content change of nitrogen in various valence states during the sludge denitrification biogas slurry provided by the embodiment 2 of the invention;
FIG. 3 shows the content change of nitrogen in various valence states during the sludge denitrification biogas slurry provided by the embodiment 3 of the invention;
FIG. 4 is a schematic flow diagram of a biogas slurry denitrification method provided by the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to embodiments and examples, but those skilled in the art will understand that the following embodiments and examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. 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. Those who do not specify the conditions are performed according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that the "biogas slurry after anaerobic digestion" in the present application is a biogas slurry obtained by subjecting organic waste to anaerobic digestion treatment.
In a first aspect, the application provides a biogas slurry denitrification method, which comprises the following steps:
a. performing short-cut nitrification on the biogas slurry subjected to anaerobic digestion to obtain nitrosation biogas slurry;
b. mixing the sludge subjected to anaerobic digestion with the nitrosation biogas slurry for denitrification;
c. c, carrying out solid-liquid separation on the mixed solution obtained after denitrification in the step b;
and c, after the step c is finished, discharging a biogas slurry part obtained by solid-liquid separation, returning the part to the step b after the part is subjected to short-cut nitrification, and repeating the step b and the step c to finish denitrification treatment.
Firstly, carrying out short-cut nitrification on anaerobically digested biogas slurry to obtain nitrosated biogas slurry, and converting ammonia nitrogen in the biogas slurry into nitrite nitrogen; then mixing the sludge subjected to anaerobic digestion with the nitrosation biogas slurry for denitrification, wherein nitrite nitrogen in the mixed solution is converted into nitrogen by utilizing the self-temperature of the raw materials without heating; due to denitrification, an internal carbon source in the sludge is released and consumed, the original structure of the sludge is damaged, the dehydration performance of the sludge is improved, and the solid-liquid separation effect of mixed liquid is enhanced; and finally, discharging the biogas slurry part obtained by solid-liquid separation, and repeatedly performing the denitrification process after partial biogas slurry is subjected to short-cut nitrification, so that the ammonia nitrogen content is further reduced.
After the biogas slurry denitrification method of the invention is circulated, as shown in fig. 4, dewatered sludge of a sewage plant is pretreated, the sludge is placed in a sludge anaerobic digestion tank for anaerobic digestion, the obtained sludge after the anaerobic digestion is mixed with nitrosation biogas slurry obtained by shortcut nitrification, the mixture is placed in a sludge storage tank for denitrification, a dewatering machine is used for solid-liquid separation after the denitrification is finished, the biogas slurry obtained by the solid-liquid separation is discharged, and part of the biogas slurry is subjected to the shortcut nitrification and then returned to the sludge storage tank to be mixed with the sludge after the anaerobic digestion for circular denitrification.
According to the biogas slurry denitrification method provided by the invention, the denitrification process utilizes the temperature of anaerobic digested sludge, aeration and heating are not needed, and the operation is simple, easy and controllable; the residual volatile fatty acid of the sludge after anaerobic digestion is relatively sufficient with an internal carbon source, when the sludge is used for denitrification, no additional carbon source is needed to be added, the sludge is more easily utilized by denitrifying bacteria, the reaction rate is high, the retention time is short, the occupied area is small, and the capital construction and operation cost is saved; the sludge subjected to anaerobic digestion is mixed with the short-cut nitrified biogas slurry for denitrification, the original structure of the sludge is destroyed, the release of an inner carbon source is enhanced, the requirement of a denitrification carbon source is met, the rapid denitrification is realized, the dehydration performance of the sludge is obviously improved, and the subsequent dehydration cost is reduced.
In some preferred embodiments, the anaerobically digested biogas slurry includes, but is not limited to, at least one of anaerobically digested biogas slurry of sludge, anaerobically digested biogas slurry of livestock and poultry manure, anaerobically digested biogas slurry of kitchen waste, or other anaerobically digested biogas slurry known to those skilled in the art.
In some preferred embodiments, the ammonia nitrogen content of the anaerobic digested biogas slurry is 600-3000 mg/L, and for example, but not limited to 600mg/L, 1200mg/L, 1800mg/L, 2400mg/L or 3000 mg/L.
In some preferred embodiments, the shortcut nitrification includes, but is not limited to, aeration, for example, a dissolved oxygen and aeration linked mode can also be adopted.
Preferably, the dissolved oxygen in the biogas slurry in the short-cut nitrification is controlled to be 0.3-0.5 mg/L, for example, but not limited to, 0.3mg/L, 0.35mg/L, 0.4mg/L, 0.45mg/L or 0.5 mg/L. In the dissolved oxygen range, the nitrosation reaction of ammonia nitrogen in the biogas slurry is more facilitated.
Preferably, the time of the short-cut nitrification is 8-24 h, for example, but not limited to 8h, 10h, 12h, 14h, 16h, 18h, 20h, 22h or 24 h.
Under the conditions that the temperature of the biogas slurry is 25-30 ℃, the dissolved oxygen is controlled to be 0.3-0.5 mg/L, and the reaction time is 8-24 h, 85% -90% of ammonia nitrogen can be converted into nitrite nitrogen.
In some preferred embodiments, the solid content of the anaerobically digested sludge is 5 wt% to 10 wt%, for example, but not limited to, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, or 10 wt%, preferably 8 wt%.
Preferably, the temperature of the sludge after anaerobic digestion is 35-45 ℃, for example, but not limited to, 35 ℃, 37 ℃, 39 ℃, 41 ℃, 43 ℃ or 45 ℃.
Generally, the solid content of the sludge after anaerobic digestion is about 8 wt%, the temperature is about 40 ℃, and heating or heat preservation is not needed when the anaerobic digestion sludge is used.
In some preferred embodiments, the volume ratio of the anaerobic digested sludge to the nitrosated biogas slurry is (1:1) - (3:1), and may be, for example, but not limited to, 1:1, 2:1 or 3: 1.
In some preferred embodiments, the temperature of the mixture of the anaerobic digested sludge and the nitrosated biogas slurry is 30 to 35 ℃, and may be, for example, but not limited to, 30 ℃, 31 ℃, 32 ℃, 33 ℃, 34 ℃ or 35 ℃. In the range of 30-35 ℃, nitrite nitrogen can be denitrified into nitrogen.
In some preferred embodiments, the denitrification is performed under agitation.
Preferably, the rotation speed of the stirring is 80-120 r/min, for example, but not limited to, 80r/min, 90r/min, 100r/min, 110r/min or 120r/min, preferably 100 r/min;
preferably, the means of agitation comprises batch agitation.
Preferably, the batch agitation comprises: stirring for 8-12min, stopping stirring for 16-24min, preferably 10min, and stopping stirring for 20 min.
In some preferred embodiments, the denitrification time is 32-48h, such as but not limited to 32h, 34h, 36h, 38h, 40h, 42h, 44h, 46h or 48 h.
In the invention, more than 99% of nitrite nitrogen in the mixed liquid can be denitrified into nitrogen by further optimizing and adjusting denitrification.
In a second aspect, the application provides an application of a biogas slurry denitrification method in the field of sewage treatment.
According to the invention, high-activity denitrifying bacteria and sufficient internal carbon sources in the sludge after high-concentration anaerobic digestion are utilized, the biogas slurry is subjected to short-range digestion and then is mixed with the sludge after anaerobic digestion in proportion, a carbon source is not required to be added, heat preservation is not required, the residual organic matters and the internal carbon sources in the sludge after digestion are reduced while denitrification is realized, the dehydration performance of the sludge can be improved, the cost is low, the operation is simple, and the method can be applied to the field of sewage treatment.
The invention is further illustrated by the following specific examples and comparative examples, but it should be understood that these examples are for purposes of illustration only and are not to be construed as limiting the invention in any way.
Example 1
A zero carbon source adding biogas slurry denitrification method is disclosed, wherein biogas slurry is from a certain sludge anaerobic digestion treatment plant, the water quality index is shown in table 1, the temperature of the biogas slurry is 25-30 ℃, and the treatment steps are as follows:
and (3) placing the biogas slurry in a nitrosation reaction tank, treating for 8 hours under the conditions that the temperature is 25-30 ℃ and the dissolved oxygen is 0.3-0.5 mg/L, converting 90% of ammonia nitrogen in the biogas slurry into nitrite nitrogen, and controlling the concentration of the nitrite nitrogen in the biogas slurry to be 585 mg/L. And then mixing the nitrosated biogas slurry with anaerobic digested sludge according to a volume ratio of 1:1, conveying the mixture into a denitrification reaction tank, carrying out denitrification treatment for 32 hours at the temperature of 30-35 ℃ under the condition of intermittent stirring (the stirring speed is 100 r/min; stirring is carried out for 10min, and stopping for 20min) to obtain a mixed solution with the concentration of nitrite nitrogen reduced to 0.1mg/L, wherein the change of each valence nitrogen during the reaction is shown in figure 1, and finally, the biogas slurry denitrification is completed through a dehydration step.
TABLE 1 biogas slurry Properties of anaerobic sludge digestion treatment plant
Example 2
A zero carbon source adding biogas slurry denitrification method is disclosed, wherein biogas slurry is from a certain livestock and poultry manure anaerobic digestion treatment plant, the water quality index is shown in Table 2, the temperature of the biogas slurry is 25-30 ℃, and the treatment steps are as follows:
and (3) placing the biogas slurry in a nitrosation reaction tank, treating for 16 hours under the conditions that the temperature is 25-30 ℃ and the dissolved oxygen is 0.3-0.5 mg/L, converting 88% of ammonia nitrogen in the biogas slurry into nitrite nitrogen, and then, controlling the concentration of the nitrite nitrogen in the biogas slurry to be 1408 mg/L. And then mixing the nitrosated biogas slurry with anaerobic digested sludge according to a volume ratio of 2:1, conveying the mixture into a denitrification reaction tank, carrying out denitrification treatment for 36 hours at the temperature of 30-35 ℃ under the condition of intermittent stirring (the stirring speed is 800 r/min; stirring for 8min, stopping for 24min) to obtain a mixed solution with the concentration of nitrite nitrogen reduced to 1.3mg/L, wherein the change of each valence nitrogen during the reaction is shown in figure 2, and finally completing biogas slurry denitrification through a dehydration step.
TABLE 2 biogas slurry Properties in anaerobic digestion treatment plant for livestock and poultry feces
Example 3
A biogas slurry denitrification method is characterized in that biogas slurry is from a kitchen waste anaerobic digestion treatment plant, the water quality index is shown in table 3, the temperature of the biogas slurry is 25-30 ℃, and the treatment steps are as follows:
and (3) placing the biogas slurry in a nitrosation reaction tank, treating for 24 hours under the conditions that the temperature is 25-30 ℃ and the dissolved oxygen is 0.3-0.5 mg/L, converting 85% of ammonia nitrogen in the biogas slurry into nitrite nitrogen, wherein the concentration of the nitrite nitrogen in the biogas slurry is 2465 mg/L. And then mixing the nitrosated biogas slurry with anaerobic digested sludge according to a volume ratio of 3:1, conveying the mixture into a denitrification reaction tank, carrying out denitrification treatment for 48 hours at the temperature of 30-35 ℃ under the condition of intermittent stirring (the stirring speed is 120 r/min; stirring for 12min, stopping for 16min) to obtain a mixed solution with the concentration of nitrite nitrogen reduced to 1.2mg/L, wherein the change of each valence nitrogen during the reaction is shown in figure 3, and finally completing biogas slurry denitrification through a dehydration step.
TABLE 3 biogas slurry Properties of anaerobic digestion treatment plant for kitchen waste
It can be seen from examples 1-3 that nitrogen in the sludge anaerobic digestion treatment plant biogas slurry, the livestock and poultry manure anaerobic digestion treatment plant biogas slurry or the kitchen waste anaerobic digestion treatment plant biogas slurry mainly exists in the form of ammonia nitrogen, the treatment method of the invention firstly converts the ammonia nitrogen in the biogas slurry into nitrite nitrogen through short-cut nitrification, then mixes the nitrosated biogas slurry with the anaerobically digested sludge and carries out denitrification, and as can be seen from fig. 1-3, the nitrite nitrogen in the mixed solution is gradually reduced along with the denitrification reaction, and the removal of the nitrite nitrogen is basically realized.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A zero carbon source adding biogas slurry denitrification method is characterized by comprising the following steps:
a. performing short-cut nitrification on the biogas slurry subjected to anaerobic digestion to obtain nitrosation biogas slurry;
b. mixing the sludge subjected to anaerobic digestion with the nitrosation biogas slurry for denitrification;
c. c, carrying out solid-liquid separation on the mixed solution obtained after denitrification in the step b;
and c, after the step c is finished, discharging a biogas slurry part obtained by solid-liquid separation, returning the part to the step b after the part is subjected to short-cut nitrification, and repeating the step b and the step c to finish denitrification treatment.
2. The method for denitrifying biogas slurry as defined in claim 1, wherein the anaerobically digested biogas slurry comprises at least one of anaerobically digested sludge biogas slurry, anaerobically digested livestock and poultry manure biogas slurry or anaerobically digested kitchen waste biogas slurry.
3. The method for denitrifying biogas slurry according to claim 1, wherein the ammonia nitrogen content of the biogas slurry after anaerobic digestion is 600-3000 mg/L.
4. The biogas slurry denitrification method according to claim 1, wherein the short-cut nitrification comprises aeration;
preferably, the dissolved oxygen in the biogas slurry in the short-cut nitrification is controlled to be 0.3-0.5 mg/L;
preferably, the time of the short-cut nitrification is 8-24 h.
5. The biogas slurry denitrification method according to claim 1, wherein the solid content of the anaerobically digested sludge is 5-10 wt%, preferably 8 wt%;
preferably, the temperature of the sludge after anaerobic digestion is 35-45 ℃.
6. The method for denitrifying biogas slurry according to claim 1, wherein the volume ratio of the anaerobic digested sludge to the nitrosated biogas slurry is (1:1) - (3: 1).
7. The biogas slurry denitrification method according to claim 1, wherein the temperature of the mixture of the anaerobically digested sludge and the nitrosated biogas slurry is 30-35 ℃.
8. The method for denitrification of biogas slurry according to claim 1, wherein denitrification is performed under stirring conditions;
preferably, the rotating speed of the stirring is 80-120 r/min, and preferably 100 r/min;
preferably, the manner of stirring includes batch stirring;
preferably, the batch agitation comprises: stirring for 8-12min, stopping stirring for 16-24min, preferably 10min, and stopping stirring for 20 min.
9. The method for denitrifying biogas slurry according to any one of claims 1 to 8, wherein the denitrification time is 32 to 48 hours.
10. Use of the biogas slurry denitrification method according to any one of claims 1 to 9 in the field of sewage treatment.
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| CN113943050A (en) * | 2021-09-29 | 2022-01-18 | 中船重工环境工程有限公司 | Denitrification device and treatment process for biogas slurry |
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| JP2003245689A (en) * | 2002-02-21 | 2003-09-02 | Kurita Water Ind Ltd | Method and apparatus for treating wastewater |
| CN105541008A (en) * | 2015-12-22 | 2016-05-04 | 浙江大学 | An efficient denitrifying and carbon-removing device for culture wastewater anaerobic biogas slurry with a low C/N ratio and a process thereof |
| CN108178475A (en) * | 2018-01-16 | 2018-06-19 | 同济大学 | A kind of efficient biogas slurry denitrogenation method in situ of anaerobic sludge digestion |
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| CN113943050A (en) * | 2021-09-29 | 2022-01-18 | 中船重工环境工程有限公司 | Denitrification device and treatment process for biogas slurry |
| CN113943050B (en) * | 2021-09-29 | 2023-11-24 | 中船重工环境工程有限公司 | Denitrification device and treatment process for biogas slurry |
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