CN114702137B - Autotrophic nitrogen removal reinforced AOA water treatment method and system based on MBBR - Google Patents
Autotrophic nitrogen removal reinforced AOA water treatment method and system based on MBBR Download PDFInfo
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Abstract
The invention discloses an autotrophic nitrogen removal reinforced AOA water treatment method and system based on MBBR, and belongs to the technical field of sewage treatment. The anaerobic treatment device comprises an anaerobic tank, an autotrophic tank, a short-cut nitrification tank, an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially arranged; the bottom of the anaerobic tank is connected with an overrunning pipeline, and the other end of the overrunning pipeline is connected with the water inlet end of the anoxic tank; a sludge return pipeline is connected between the sedimentation tank and the anaerobic tank, and sludge flows back to the anaerobic tank from the sedimentation tank; the invention combines autotrophic denitrification CANON process, short-cut nitrification-anaerobic ammonia oxidation process and endogenous denitrification dephosphorization process, and has the advantages of excellent denitrification effect, excellent nitrification effect, stable operation, occupied land and the like.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an autotrophic nitrogen removal reinforced AOA water treatment method and system based on MBBR.
Background
Along with the continuous upgrading of domestic sewage discharge standards, the requirements of sewage treatment industries on the denitrification and dephosphorization performances of sewage treatment biochemical systems are continuously improved. The AOA technology utilizes lower ratio of aerobic to anoxic tank volume, and reduces the consumption of an internal carbon source in an aerobic tank through smaller aerobic residence time; on the other hand, the sufficient denitrification tank capacity is ensured, when the treatment of the sewage is relatively low in C/N, the anoxic Chi Li utilizes PHA synthesized in an anaerobic stage, the relatively high denitrification efficiency can be ensured through the endogenous denitrification effect, and the relatively high biological dephosphorization rate can be ensured through denitrification dephosphorization, so that the requirement of sewage denitrification on an external carbon source is reduced, and the energy conservation and consumption reduction of sewage treatment are realized. The anaerobic ammonia oxidation process realizes the autotrophic denitrification process of sewage through enriching autotrophic anaerobic ammonia oxidation bacteria, and is often matched with a short-range nitrification process for ammonia nitrogen sewage treatment, compared with the traditional nitrification and denitrification process, the anaerobic ammonia oxidation process has the advantages of saving 60% of aeration, reducing 90% of sludge output and relatively less release amount of nitrogen oxides without adding an organic carbon source, and the like, and in addition, the anaerobic ammonia oxidation process has high denitrification load, low operation cost and small occupied space, and is recognized as one of the most economical biological denitrification processes at present. As two high-efficiency low-consumption denitrification processes, the AOA is coupled with anaerobic ammonia oxidation, so that the dependence of sewage denitrification on raw water carbon sources can be further reduced, and the energy conservation and consumption reduction of sewage treatment are realized.
The related research reports of the related aspects of the AOA technology coupled with the anaerobic ammonia oxidation technology in the prior art mainly comprise the following steps:
application number 201910358964.6 discloses a method and a device for treating urban sewage by an AOA process of full-flow anaerobic ammonia oxidation enhanced denitrification, which utilize the short-cut nitrification anaerobic ammonia oxidation principle, add an anaerobic ammonia oxidation suspension carrier into the full-flow of the AOA device, and utilize nitrous and residual ammonia nitrogen generated in each reaction zone of the full-flow as matrixes to achieve the aim of enhanced denitrification. However, in the application process, the method has several technical difficulties, which may cause that the treatment effect cannot reach the expectations. Firstly, the invention considers that when total nitrogen of effluent is more than or equal to 15mg/L and ammonia nitrogen is more than or equal to 5mg/L, HRT can be prolonged for 2 hours, but in the practical application process, the volume of a reaction tank is fixed, and the inflow rate is generally unchanged, so that the HRT is also unchanged; secondly, nitrous is used as one of the main substrates of the anammox bacteria, only as a by-product in the invention, which is detrimental to the enrichment of the anammox bacteria; thirdly, DO of the aerobic tank is 1-2mg/L, which is not beneficial to reducing the consumption of carbon sources in the aerobic tank; finally, the invention takes the anoxic tank as the end reaction tank, and cannot ensure that the ammonia nitrogen stably reaches the standard.
Application number 202110548598.8 discloses a method for treating middle and late landfill leachate by continuous flow short-cut nitrification/endogenous short-cut denitrification/anaerobic ammoxidation integrated process, which comprises the steps of partially short-cut nitrifying in an aerobic section, oxidizing ammonia nitrogen in inlet water into nitrite nitrogen partially, performing anaerobic ammoxidation in an anoxic section to generate partial nitrate nitrogen, reducing the nitrate nitrogen into nitrite nitrogen through endogenous short-cut denitrification, and providing nitrite nitrogen for anaerobic ammoxidation. Application number 201710271411.8 discloses a method for coupling continuous flow AOA semi-shortcut anaerobic ammonia oxidation with endogenous denitrification, which comprises the steps of carrying out partial shortcut nitrification in an aerobic tank, and carrying out anaerobic ammonia oxidation and endogenous denitrification dephosphorization in an anoxic tank to remove nitrogen and phosphorus; application number 202110336253.6 discloses an AOA coupling anaerobic ammonia oxidation deep denitrification and dephosphorization process, wherein an aerobic section performs partial short-cut nitrification-anaerobic ammonia oxidation, and then an anoxic section performs endogenous short-cut denitrification-anaerobic ammonia oxidation.
The above prior art also has the following problems: firstly, setting an aerobic zone in the whole system, utilizing anaerobic ammonia oxidation to reduce nitrogen load, utilizing endogenous denitrification as a denitrification main body, and causing excessive risk of effluent TN when the C/N is too low; secondly, partial short-cut nitrification needs to control more strict ammonia nitrogen: the nitrous matrix ratio is controlled to meet the requirement of the subsequent anaerobic ammonia oxidation matrix, and long-term partial short-cut nitrification is very strict in the requirement of relative abundance of functional bacteria and is difficult to control.
Application number 201910762403.2 discloses a device and a method for realizing continuous flow AOA biomembrane semi-short-path coupling anaerobic ammonia oxidation by hydroxylamine. However, the invention is likely to have the problem that the half-short-cut nitrification in the aerobic zone cannot be maintained for a long time, and the short-cut nitrification in the aerobic zone is completely dependent on the activated sludge, and the structural stability of the activated sludge flora is poor.
In summary, the current AOA coupled anaerobic ammonia oxidation related process has the following technical problems:
firstly, the carbon loss problem exists in an aerobic tank, the main aerobic tank is subjected to short-cut nitrification or half-short-cut nitrification, anaerobic ammonia oxidizing bacteria are not enriched, DO is controlled to be relatively high, and the carbon loss caused by too high carbon loss causes insufficient carbon sources in an anoxic tank, so that the denitrification effect is influenced; secondly, the half-short-cut nitrification generated in the aerobic tank is favorable for anaerobic ammoxidation reaction of the anoxic Chi Fasheng, but the half-short-cut nitrification is difficult to control, and stable operation control is difficult to realize when the C/N of the inflow water is low. Finally, the system takes the anoxic tank as a terminal process, so that the ammonia nitrogen can not reach the standard directly; in view of the above, to embody the advantages of the AOA coupled anaerobic ammoxidation process, improvements in the prior art are needed.
Disclosure of Invention
The invention aims to provide an autotrophic nitrogen removal reinforced AOA water treatment method based on MBBR, which redesigns the existing AOA sewage treatment process, ensures the nitrification by CANON, short-range nitrification and aerobic IFAS areas together, and takes over the denitrification by the combination of CANON, short-range nitrification, anaerobic ammoxidation and endogenous denitrification.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an autotrophic nitrogen removal reinforced AOA water treatment method based on MBBR is characterized by comprising the following steps in sequence:
a. introducing sewage to be treated into an anaerobic tank, and mainly synthesizing a carbon source and releasing phosphorus in activated sludge through the anaerobic tank, wherein the HRT of the anaerobic tank is 1-2 h;
b. part of effluent of the anaerobic tank enters an autotrophic tank connected with the anaerobic tank, a suspension carrier is added into the autotrophic tank, DO is controlled to be 0.2-0.5mg/L, and nitrosations growing in a suspending way in sludge are utilizedAnd the nitrosating bacteria and the anaerobic ammoxidation bacteria which are attached and grown on the suspension carrier respectively carry out short-cut nitrification and anaerobic ammoxidation reaction to finish partial NH 4 + The removal of N and TN, simultaneously producing a small amount of nitrate nitrogen, and carrying out denitrification dephosphorization reaction on denitrifying dephosphorization bacteria in sludge under the condition;
c. the effluent of the autotrophic pond enters a shortcut nitrification pond connected with the autotrophic pond, a suspension carrier is added into the shortcut nitrification pond, DO is controlled to be 2mg/L, shortcut nitrification is carried out through the sludge and nitrosating bacteria in the suspension carrier, and NH is carried out 4 + Conversion of N to NO 2 - N, the nitrogen accumulation rate is more than 80% at this stage, and the phosphorus accumulating bacteria in the sludge perform aerobic phosphorus absorption reaction;
d. the effluent of the short-cut nitrification tank enters an anoxic tank connected behind the anoxic tank, and part of mixed liquid carried by an overrun pipeline connected with the anaerobic tank enters the anoxic tank together, wherein the overrun ratio from the anaerobic tank to the anoxic tank is 10-40%, and denitrifying phosphorus removal bacteria rich in internal carbon sources and NH are provided for the anoxic tank 4 + Adding a suspension carrier into the anoxic tank, and carrying out NH on anaerobic ammonia oxidizing bacteria which grow on the suspension carrier 4 + -N and NO 2 - -removal of N and generation of small amounts of NO 3 - N, denitrifying phosphorus removal bacteria in sludge perform denitrification phosphorus removal reaction to perform NO 3 - -removal of N and phosphate;
e. the effluent of the anoxic tank enters an aerobic tank connected with the anoxic tank, DO is controlled to be 2-6 mg/L, and residual NH is carried out by nitrifying bacteria in the sludge and the suspended carrier 4 + -N removal, ensuring the effluent NH 4 + -N stable up to standard;
the effective specific surface area of the suspension carrier added in the autotrophic tank, the short-cut nitrification tank, the anoxic tank and the aerobic tank is more than or equal to 620m 2 /m 3 The void ratio is more than 90 percent, the filling rate is more than or equal to 30 percent and less than 67 percent, wherein the density of the suspension carrier in the autotrophic pond and the anoxic pond is 0.97 to 1.03g/cm 3 The density of the suspended carrier in the short-cut nitrification tank and the aerobic tank is 0.94-0.97 g/cm 3 ；
f. And (3) the effluent of the aerobic tank enters a sedimentation tank for mud-water separation, supernatant fluid of the sedimentation tank is discharged from an upper part of a system, the reflux ratio of sludge is controlled to be 50% -100%, partial sludge at the bottom of the sedimentation tank is refluxed to an anaerobic tank, and the rest sludge is discharged as surplus sludge.
As a preferable scheme of the invention, hydroxylamine hydrochloride solution is added into the short-cut nitrification tank, the concentration of the hydroxylamine hydrochloride solution and the adding flow are regulated according to the water inflow flow, the water inflow concentration of the hydroxylamine hydrochloride in the short-cut nitrification tank is controlled to be 5-30 mg/L, when the accumulation rate of the short-cut nitrification Chi Yadan is lower than 80%, the hydroxylamine solution is continuously added, and when the accumulation rate of the nitrous oxide is higher than 80% in 3 days.
As another preferable scheme of the invention, the residual sludge discharge amount of the sedimentation tank is regulated, and the sludge SRT is controlled to be 10-25 d.
Further preferably, the water outlet ends of the autotrophic tank, the short-cut nitrification tank, the anoxic tank and the aerobic tank are all provided with interception screens.
Preferably, aeration pipelines are arranged in the autotrophic tank, the short-range nitrification tank and the aerobic tank.
In the scheme, CANON suspension carriers with mature hanging films are added into the autotrophic pond; an ANAMMOX suspension carrier with mature hanging film is added into the anoxic tank; and adding a suspension carrier without film hanging into the aerobic tank.
The invention further aims to provide an autotrophic nitrogen removal reinforced AOA water treatment system based on MBBR, which is characterized in that: the anaerobic treatment device comprises an anaerobic tank, an autotrophic tank, a short-cut nitrification tank, an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially arranged;
an overrun pipeline is connected to the pipeline between the anaerobic tank and the autotrophic tank, and the other end of the overrun pipeline is connected to the pipeline between the short-cut nitrification tank and the anoxic tank;
a sludge return pipeline is connected between the sedimentation tank and the anaerobic tank, and sludge flows back to the anaerobic tank from the sedimentation tank;
the anaerobic tank is used for synthesizing a carbon source in the activated sludge and releasing phosphorus, and the HRT of the anaerobic zone is 1-2 h;
the autotrophic pool HRT is 2-4 h, the short-range nitrification pool HRT is 1-2 h, the anoxic pool HRT is 2-4 h, and the aerobic pool HRT is 0.5-1 h.
Compared with the prior art, the invention has the following beneficial technical effects:
1) The nitrification effect is excellent, the system nitrification is jointly ensured by an autotrophic tank, a short-cut nitrification tank and an aerobic tank, the ammonia nitrogen removal rate can reach more than 95%, and the ammonia nitrogen in the effluent can be less than or equal to 0.5mg/L;
2) The denitrification effect is good, the denitrification is jointly borne by CANON, short-cut nitrification and anaerobic ammonia oxidation, and endogenous denitrification, so that higher denitrification efficiency can be realized, and the TN of the effluent after optimization and adjustment can be less than or equal to 5mg/L;
3) The operation is stable, and aiming at short-cut nitrification in a sludge membrane composite MBBR form, the optimal hydroxylamine hydrochloride adding concentration is verified through a test, so that the stable operation of the system is ensured;
4) The occupied area is saved, the denitrification load of the anaerobic ammonia oxidation process is high, the enrichment efficiency of functional bacterial groups can be further improved by adopting an MBBR mode, the load is higher, compared with the traditional nitrification and denitrification process, the occupied area can be saved by more than 60%, and the minimum HRT (high performance test) of the system design is only 6.5 hours.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a flow chart of the treatment process of the present invention;
FIG. 2 is a graph showing ammonia nitrogen change in effluent of the device a and the device b in comparative example 1.
Detailed Description
The invention provides an autotrophic nitrogen removal reinforced AOA water treatment method and system based on MBBR, and the invention is described in detail below with reference to specific embodiments in order to make the advantages and technical scheme of the invention clearer and more definite.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated component or section without excluding other components or sections.
Spatially relative terms, such as "below," "beneath," "lower," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature's relationship in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the article in use or operation in addition to the orientation depicted in the figures. For example, if the article in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" may encompass both a direction of below and a direction of above. Other orientations of the component (90 degrees or other) are possible and the spatially relative descriptors used herein interpreted accordingly.
First, some technical terms related to the present invention will be explained in detail.
Nitrogen accumulation rate: nitrite produced by oxidizing each unit of ammonia nitrogen in the short-cut nitrification tank;
the invention relates to an overrun pipeline, the starting end of which is arranged on a pipeline between an anaerobic tank and an autotrophic tank, and the tail end of which is arranged on a pipeline between a short-cut nitrification tank and an anoxic tank. The "overrun ratio" refers to the flow rate of the mixture on the overrun line.
"sludge SRT" refers to the average residence time of activated sludge throughout the system.
Secondly, the main innovation points of the invention are as follows:
an AOA process adopts a process flow of anaerobic, aerobic and anoxic, an anaerobic tank utilizes activated sludge to absorb organic matters contained in inlet water, and synthesized PHA (internal carbon source) is stored in cells, and phosphorus release occurs at the same time; the aerobic tank mainly completes the nitrification of ammonia nitrogen, and the anoxic tank utilizes the activated sludge to perform denitrification and dephosphorization in the internal carbon source synthesized in the anaerobic section, so that the dual purposes of denitrification, dephosphorization and one carbon are realized, and the utilization rate of the raw water carbon source is improved. Therefore, the core of the AOA technology is the arrangement of an aerobic tank, or the tank capacity is reduced, so that the loss of an internal carbon source is reduced, but the capacity of the aerobic tank is reduced, and the nitrification effect of the aerobic tank is affected; or in the form of an innovative process to achieve good nitration at low DO conditions, thereby reducing carbon loss. In addition, the AOA technology carries out denitrification through heterotrophic denitrification, so that the nitrogen and phosphorus of the effluent cannot be ensured to reach the standard stably aiming at the treatment of low carbon nitrogen ratio water quality.
Based on the above consideration, the reaction tank is redesigned, and mainly the following four aspects are considered:
firstly, aiming at the problem of carbon loss of an aerobic tank of an AOA process, the process is based on a mud film composite MBBR process, the aerobic tank is divided into two parts, wherein the integrated whole-process autotrophic denitrification CANON process is arranged in front, the low DO operation is adopted, the short-range nitrification technology is arranged behind, the reaction rate is high, the residence time is effectively reduced, and therefore the carbon loss of the aerobic tank is reduced.
Secondly, aiming at the problem of difficult control in the short-cut nitrification process, the hydroxylamine hydrochloride is added, so that the accumulation rate of nitrous can be stably controlled to be more than 80%, and a stable and sufficient matrix is provided for anaerobic ammonia oxidizing bacteria in the rear-end anoxic pond.
Thirdly, aiming at the problem of poor denitrification effect of the low carbon nitrogen ratio wastewater, the autotrophic pond is used for enriching anaerobic ammonia oxidation bacteria, and meanwhile, the anoxic pond is used for adding the suspension carrier enriched with anaerobic ammonia oxidation bacteria, so that autotrophic denitrification with a certain proportion is realized, and the dependence of the denitrification process of the system on carbon sources is reduced;
fourth, in order to solve the problem of large occupied area of the existing technology, the invention takes four aspects into consideration, the design is not in accordance with the traditional activated sludge method design mode, the main body of the aerobic tank adopts a sludge membrane composite MBBR technology, and the stable short-cut nitrification process is controlled by adding hydroxylamine, so that the treatment load of the system can be improved, and a part of occupied area of the aerobic tank can be saved; secondly, the autotrophic pond can directly convert ammonia nitrogen into nitrogen in an autotrophic denitrification mode, so that the volumes of a partial short-cut nitrification-MBBR pond and an anoxic pond are reduced, and the partial occupied area can be saved; finally, the anoxic tank adopts a mud film composite MBBR technology, anaerobic ammonia oxidation bacteria are enriched by adding a suspension carrier, the coupling of endogenous denitrification heterotrophic denitrification and anaerobic ammonia oxidation autotrophic denitrification can be realized, TN removal is realized together, the denitrification load of the anoxic tank is further improved, and the anoxic tank capacity is reduced.
The innovation points are closely connected and inseparable, partial ammonia nitrogen is removed from the autotrophic pond through autotrophic denitrification, the nitrification and denitrification water inflow load and the residence time of the subsequent pond body are reduced, the loss of carbon sources in the activated sludge can be reduced, and the method is a key step for achieving the standard of system stability; the short-cut nitrification tank has the advantages of high reaction rate and relatively easy control, can effectively reduce the retention time of the aerobic tank, further reduce the carbon loss, can provide sufficient nitrous, and provides a stable matrix for anaerobic ammonia oxidizing bacteria on a suspension carrier of the anoxic tank; the anoxic tank adopts a mud film composite MBBR technology, anaerobic ammonia oxidation bacteria are enriched through suspension carrier addition, so that the coupling of endogenous denitrification heterotrophic denitrification and anaerobic ammonia oxidation autotrophic denitrification can be realized, the stable standard of the system effluent TN is ensured, part of phosphorus can be removed by denitrification dephosphorization bacteria while denitrification is carried out, and the phosphorus concentration of the effluent is effectively reduced; the aerobic tank mainly ensures that COD and ammonia nitrogen reach the standard stably.
As shown in FIG. 1, the system comprises a reaction tank, wherein the reaction tank is divided into an anaerobic tank, an autotrophic tank, a short-range nitrification tank, an anoxic tank, an aerobic tank and a sedimentation tank in sequence by being used as a main improvement point of the invention.
The main water inlet pipeline is connected with the anaerobic tank, water to be treated firstly enters the anaerobic tank through the main water inlet pipeline, in the anaerobic tank, water inlet organic matters are adsorbed by activated sludge, PHA is generated and stored in the body, meanwhile, anaerobic phosphorus release occurs, and the HRT of the anaerobic tank is 1-2 h.
The anaerobic tank and the autotrophic tank are communicated, for example, water holes arranged at the upper part of the water outlet end of the anaerobic tank are communicated, water outlet of the anaerobic tank enters the autotrophic tank through the water holes, an overrun pipeline is connected to a pipeline between the anaerobic tank and the autotrophic tank, and the other end of the overrun pipeline is connected to a pipeline between the short-cut nitrification tank and the anoxic tank;
a sludge return pipeline is connected between the sedimentation tank and the anaerobic tank, and sludge flows back to the anaerobic tank from the sedimentation tank.
The anaerobic tank is used for synthesizing a carbon source in the activated sludge and releasing phosphorus, and the HRT of the anaerobic tank is 1-2 h;
the autotrophic pool HRT is 2-4 h, the short-range nitrification pool HRT is 1-2 h, the anoxic pool HRT is 2-4 h, and the aerobic pool HRT is 0.5-1 h;
and preferably, interception screens are arranged at the water outlet ends of all functional areas where the suspension carriers are added to prevent the suspension carriers from rushing out.
The inside of the anaerobic tank and the inside of the anoxic tank are respectively provided with a stirrer; aeration pipelines are arranged in the autotrophic tank, the short-range nitrification tank and the aerobic tank; the specific structures of the aeration pipeline and the submersible mixer can be realized by referring to the prior art.
The effective specific surface area of the CANON suspension carrier is more than or equal to 620m 2 /m 3 The void ratio is more than 90%, the filling rate is more than or equal to 30% and less than 67%, and the density of the CANON suspension carrier is 0.97-1.03 g/cm 3 ；
The effective specific surface area of the suspension carrier added into the anoxic tank is more than or equal to 620m 2 /m 3 The void ratio is more than 90%, the filling rate is more than or equal to 30% and less than 67%, and the density of the suspension carrier is 0.97-1.03 g/cm 3 ；
The effective specific surface area of the suspension carrier added into the aerobic tank is more than or equal to 620m 2 /m 3 The void ratio is more than 90%, the filling rate is more than or equal to 30% and less than 67%, and the density of the suspension carrier is 0.94-0.97 g/cm 3 。
The treatment process of the present invention will be described in detail with reference to the above system.
The method specifically comprises the following steps:
firstly, sewage to be treated firstly enters an anaerobic tank, denitrifying phosphorus removal bacteria in the sludge absorb organic matters in the sewage to be synthesized into an internal carbon source, and meanwhile, phosphorus release reaction is completed;
secondly, a part of effluent from the anaerobic tank enters an autotrophic tank connected with the autotrophic tank, a CANON suspension carrier with mature hanging film is added into the autotrophic tank, and partial NH is completed through short-range nitrification and anaerobic ammoxidation reactions of nitrosations which are suspended and grown in sludge and nitrosations and anaerobic ammoxidation bacteria which are attached and grown on the CANON suspension carrier 4 + Removal of N and TN, simultaneously with the production ofA small amount of nitrate nitrogen, and denitrifying phosphorus removal bacteria in the sludge perform denitrification phosphorus removal reaction under the condition; the filling rate of CANON suspension carrier is more than or equal to 30%;
thirdly, the effluent of the autotrophic pond enters a short-cut nitrification pond connected with the autotrophic pond, DO is controlled to be 1-3 mg/L, short-cut nitrification reaction is carried out through the sludge and the nitrosating bacteria in the suspension carrier, and NH is carried out 4 + Conversion of N to NO 2 - N, the nitrogen accumulation rate is more than 80% at this stage, and the phosphorus accumulating bacteria in the sludge perform aerobic phosphorus absorption reaction;
step four, the effluent of the short-cut nitrification tank enters an anoxic tank connected behind the anoxic tank, and part of mixed liquid carried by an overrun pipeline connected with the anaerobic tank enters the anoxic tank, wherein the overrun ratio from the anaerobic tank to the anoxic tank is 10-40%, and denitrifying phosphorus removal bacteria rich in internal carbon sources and NH are provided for the anoxic tank 4 + N, NH by anaerobic ammonia oxidation bacteria growing on suspension carrier 4 + -N and NO 2 - -removal of N and generation of small amounts of NO 3 - N, denitrifying phosphorus removal bacteria in sludge perform denitrification phosphorus removal reaction to perform NO 3 - -removal of N and phosphate;
the anommox suspension carrier with mature hanging film is added into the anoxic tank;
fifthly, the effluent of the anoxic tank enters an aerobic tank connected with the anoxic tank, DO is controlled to be 2-6 mg/L, and residual NH is carried out through nitrifying bacteria in the sludge and the suspended carrier 4 + -N removal, ensuring the effluent NH 4 + -N stable up to standard;
the suspension carrier without film is added into the aerobic tank, and the filling rate of the suspension carrier in the aerobic tank is more than or equal to 30%;
and sixthly, the effluent of the aerobic tank enters a sedimentation tank for mud-water separation, supernatant fluid of the sedimentation tank is discharged from an upper part of a system, the reflux ratio of sludge is controlled to be 50% -100%, partial sludge at the bottom of the sedimentation tank is refluxed to an anaerobic tank, and the rest sludge is discharged as surplus sludge.
In the steps, hydroxylamine hydrochloride solution is added into the short-cut nitrification tank, the concentration of the hydroxylamine hydrochloride solution and the adding flow are regulated according to the water inflow flow, the water inflow concentration of the hydroxylamine hydrochloride in the short-cut nitrification tank is controlled to be 5-30 mg/L, when the accumulation rate of the short-cut nitrification Chi Yadan is lower than 80%, the hydroxylamine solution is continuously added, and when the accumulation rate of the nitrous oxide is higher than 80% in 3 days.
In the above steps, the residual sludge discharge amount of the sedimentation tank is regulated, and the sludge SRT is controlled to be 10-25 d.
The present invention will be described in detail with reference to specific examples.
Example 1:
the six groups of short-cut nitrification tank devices, numbered a-f, are all used for treating main municipal sewage, in order to ensure the stable short-cut nitrification effect of the system, the optimal addition concentration is verified by adopting a hydroxylamine hydrochloride addition mode, the experimental results are shown in table 1, when the hydroxylamine hydrochloride addition concentration is increased to 6mg/L, the nitrogen accumulation rate of the short-cut nitrification tank is gradually increased to 90%, and when the hydroxylamine hydrochloride addition concentration is further increased, the nitrogen accumulation rate of the system is not increased and is reversely decreased, and the toxicity inhibition of hydroxylamine with too high concentration on ammonia oxidizing bacteria is possible. It can be seen that the better short-cut nitrification effect is maintained, and the larger the addition amount of the non-hydroxylamine is, the better, and the optimal addition amount of hydroxylamine hydrochloride in the short-cut nitrification tank is 6mg/L from the view of the comprehensive operation effect.
TABLE 1 System Nitrogen accumulation Rate (%)
Example 2:
seven groups of sewage treatment devices are numbered A-H, biochemical sections all adopt CANON technology based on mud film compounding, and aiming at the denitrification effect of the sewage treatment devices, the single factor variable is controlled to be DO, and the single factor variable is respectively set to be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 and 0.7mg/L. The rest operation conditions of the devices are consistent, the TN removal amount of the autotrophic pond of each device is compared and verified, and the experimental results are shown in Table 2.
TABLE 2 removal of system TN at different DO (mg/L)
As a result, with the rising of DO, the TN removal amount of the autotrophic pool is firstly increased and then decreased, when the DO of the autotrophic pool is 0.2-0.5mg/L, the TN removal amount of the autotrophic pool can reach 8.9-10.5 mg/L, and when the DO is further increased to 0.6mg/L, the TN removal amount of the autotrophic pool is obviously decreased to 7.4mg/L, and as a result, when the DO of the autotrophic pool is 0.2-0.5mg/L, the TN removal effect of the system can be better.
Example 3:
the three groups of devices are respectively provided with a serial number a-c and are used for treating main flow municipal sewage, the three groups of devices are respectively an anaerobic tank, a front aerobic tank and a connection mode of an anoxic tank, an aerobic tank and a sedimentation tank in the process flow, and other tank body design parameters and operation modes are the same except the front aerobic tank, wherein the front aerobic tank of the device a only adopts a CANON process; the front aerobic tank of the device b is the same as the device b, and adopts a form of front CANON+ and rear shortcut nitrification; the front aerobic tank of the device c adopts the form of front shortcut nitrification and rear CANON. The purpose of this embodiment is mainly to study the influence of the setting mode of the autotrophic pond on the system treatment effect.
TABLE 3 System effluent quality (mg/L) for different settings of autotrophic ponds
As shown in Table 3, the experimental results show that when the current aerobic tank only adopts the CANON technology, the ammonia nitrogen and TN of the system effluent are respectively 6.34+/-1.26 mg/L and 18.74+/-3.67 mg/L, which are higher than the first-level A standard; when the front aerobic tank adopts a mode of front shortcut nitrification and rear CANON, ammonia nitrogen in the effluent of the system can reach the standard stably, but the TN of the effluent is slightly higher than the first-level A standard; when the front aerobic tank adopts a front CANON+ rear shortcut nitrification mode, the ammonia nitrogen and TN of the effluent can be respectively reduced to 0.78+/-0.14 mg/L and 4.42+/-0.52 mg/L, which are obviously reduced compared with the former two setting modes, and the standard can be stably met.
Example 4:
six groups of short-cut nitrification devices, numbered a-f, are all used for treating main flow municipal sewage, and in order to ensure the stable short-cut nitrification effect of the system, the optimal DO of the nitrifying MBBR tank needs to be determined, and the experimental results are shown in Table 4.
TABLE 4 System Nitrogen accumulation Rate (%)
When DO is 0.5mg/L, the accumulation rate of nitrous oxide is lower, 63%, when DO is gradually increased to 2mg/L, the accumulation rate of nitrous oxide is gradually increased to 88%, and when DO is further increased, the accumulation rate of system nitrous oxide is significantly reduced, and the inhibition of nitrite oxidizing bacteria by hydroxylamine is reduced due to the possibly too high DO, which results in partial nitrous oxide being oxidized to nitrous oxide. From the comprehensive operation effect, the optimal DO of the short-cut nitrification tank is 2mg/L.
Example 5:
certain two sets of devices, serial numbers a-b, are all used for treating mainstream municipal sewage, device a adopts the technological process of this application, and device b reaction tank is anaerobic tank, autotrophic tank, short-range nitration tank, anoxic tank and sedimentation tank in proper order, does not set up the good oxygen pond of rear end promptly, and anoxic tank goes out water and directly enters into in the sedimentation tank. The total HRT of the two devices is consistent, each function area HRT is shown in table 5, and the purpose of the experiment is mainly to study the influence of the arrangement of the rear-end aerobic tank on the system.
TABLE 5 functional regions HRT of devices a-b
The experimental results are shown in fig. 2, the ammonia nitrogen in the effluent of the device b and the device a are 5.41+/-0.50 mg/L and 2.12+/-0.19 mg/L respectively, the effluent of the device b is higher than that of the device a, and the arrangement of the rear-end aerobic tank can obviously reduce the ammonia nitrogen in the effluent and ensure that the ammonia nitrogen in the effluent of the system is stable and reaches the standard.
The parts not described in the invention can be realized by adopting or referring to the prior art.
It should be further understood that the specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (5)
1. An autotrophic nitrogen removal reinforced AOA water treatment method based on MBBR is characterized by comprising the following steps in sequence:
a. introducing sewage to be treated into an anaerobic tank, and mainly synthesizing a carbon source and releasing phosphorus in activated sludge through the anaerobic tank, wherein the HRT of the anaerobic tank is 1-2 hours;
b. part of effluent from the anaerobic tank enters an autotrophic tank connected with the anaerobic tank, a suspension carrier is added into the autotrophic tank, DO is controlled to be 0.2-0.5mg/L, and partial NH is completed by respectively carrying out short-range nitrification and anaerobic ammoxidation by nitrosations which are suspended and grown in sludge and nitrosations and anaerobic ammoxidation bacteria which are attached and grown on the suspension carrier 4 + The removal of N and TN, while producing a small amount of nitrate nitrogen, the phosphorus accumulating bacteria in the sludge perform biological phosphorus removal reaction under the condition;
c. the effluent of the autotrophic pond enters a shortcut nitrification pond connected with the autotrophic pond, a suspension carrier is added into the shortcut nitrification pond, DO is controlled to be 2mg/L, shortcut nitrification is carried out through the sludge and nitrosating bacteria in the suspension carrier, and NH is carried out 4 + Conversion of N to NO 2 - N, the nitrogen accumulation rate is more than 80% at this stage, and the phosphorus accumulating bacteria in the sludge perform aerobic phosphorus absorption reaction;
d. the effluent of the short-cut nitrification tank enters an anoxic tank connected behind the anoxic tank, and part of mixed liquid carried by an overrun pipeline connected with the anaerobic tank enters the anoxic tank together, wherein the overrun ratio from the anaerobic tank to the anoxic tank is 10-40%, and denitrifying phosphorus removal bacteria rich in internal carbon sources and NH are provided for the anoxic tank 4 + Adding a suspension carrier into the anoxic tank, and carrying out NH on anaerobic ammonia oxidizing bacteria which grow on the suspension carrier 4 + -N and NO 2 - -removal of N and generation of small amounts of NO 3 - N, denitrifying phosphorus removal bacteria in sludge generate denitrification phosphorus removalReaction to proceed NO 3 - -removal of N and phosphate;
e. the effluent of the anoxic tank enters an aerobic tank connected with the anoxic tank, DO is controlled to be 2-4 mg/L, and residual NH is carried out by nitrifying bacteria in the sludge and the suspended carrier 4 + -N removal, ensuring the effluent NH 4 + -N stable up to standard;
the effective specific surface area of the suspension carrier added in the autotrophic tank, the short-cut nitrification tank, the anoxic tank and the aerobic tank is more than or equal to 620m 2 /m 3 The void ratio is more than 90 percent, the filling rate is more than or equal to 30 percent and less than 67 percent, wherein the density of the suspension carrier in the autotrophic pond and the anoxic pond is 0.97 to 1.03g/cm 3 The density of the suspended carrier in the short-cut nitrification tank and the aerobic tank is 0.94-0.97 g/cm 3 ；
f. The effluent of the aerobic tank enters a sedimentation tank for mud-water separation, the supernatant of the sedimentation tank is discharged from an upper part of a system, the reflux ratio of sludge is controlled to be 50% -100%, part of sludge at the bottom of the sedimentation tank is refluxed to an anaerobic tank, and the rest of sludge is discharged as surplus sludge;
the HRT of the anaerobic tank is 1-2 hours;
the autotrophic pool HRT is 2-4 h, the short-range nitrification pool HRT is 1-2 h, the anoxic pool HRT is 2-4 h, and the aerobic pool HRT is 0.5-1 h.
2. The method for autotrophic nitrogen removal enhanced AOA water treatment based on MBBR according to claim 1, wherein the method comprises the following steps: when the accumulation rate of the short-cut nitrification Chi Yadan is lower than 80%, adding hydroxylamine hydrochloride solution with the concentration of 6mg/L into the short-cut nitrification tank, and when the accumulation rate of the nitrous oxide is higher than 80% for 3 continuous days, stopping adding.
3. The method for autotrophic nitrogen removal enhanced AOA water treatment based on MBBR according to claim 1, wherein the method comprises the following steps: and (3) regulating the residual sludge discharge amount of the sedimentation tank, and controlling the sludge SRT to be 10-25 d.
4. The method for autotrophic nitrogen removal enhanced AOA water treatment based on MBBR according to claim 1, wherein the method comprises the following steps: the water outlet ends of the autotrophic tank, the short-range nitrification tank, the anoxic tank and the aerobic tank are all provided with interception screens.
5. The method for autotrophic nitrogen removal enhanced AOA water treatment based on MBBR according to claim 1, wherein the method comprises the following steps: aeration pipelines are arranged in the autotrophic tank, the short-range nitrification tank and the aerobic tank, and submersible agitators are arranged in the anaerobic tank and the anoxic tank.
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