CN114702137A - MBBR (moving bed biofilm reactor) -based autotrophic denitrification enhanced AOA (argon oxygen decarburization) water treatment method and system - Google Patents
MBBR (moving bed biofilm reactor) -based autotrophic denitrification enhanced AOA (argon oxygen decarburization) water treatment method and system Download PDFInfo
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Abstract
The invention discloses an autotrophic nitrogen removal reinforced AOA water treatment method and system based on MBBR, belonging to the technical field of sewage treatment. The system comprises an anaerobic tank, an autotrophic tank, a shortcut 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 the autotrophic nitrogen removal CANON process, the shortcut nitrification-anaerobic ammonia oxidation process and the endogenous denitrification phosphorus removal process, and has the advantages of excellent nitrogen removal effect, excellent nitrification effect, stable operation, land occupation saving and the like.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an MBBR-based autotrophic nitrogen removal reinforced AOA water treatment method and system.
Background
With the continuous upgrade of domestic sewage discharge standards, the requirements of sewage treatment industry on the nitrogen and phosphorus removal performance of a sewage treatment biochemical system are continuously improved. The AOA process utilizes a lower aerobic/anoxic tank volume ratio, and reduces the consumption of an internal carbon source in an aerobic tank on the one hand through shorter aerobic retention time; on the other hand, the sufficient denitrification tank capacity is ensured, when the C/N of inflow water is lower, the anoxic tank utilizes PHA synthesized in the anaerobic stage, the higher denitrification efficiency can be ensured through the endogenous denitrification effect, and the higher biological phosphorus removal rate can be ensured through the denitrification phosphorus removal, so that the requirement of sewage nitrogen removal 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 nitrogen removal process of sewage by enriching autotrophic anaerobic ammonia oxidation bacteria, aims at ammonia nitrogen type sewage treatment, is usually combined with a short-cut nitrification process, and has the advantages of saving 60 percent of aeration quantity, not needing to add organic carbon sources, reducing 90 percent of sludge yield, relatively less nitrogen oxide release amount and the like compared with the traditional nitrification and denitrification process. As two high-efficiency and low-consumption denitrification processes, the AOA is coupled with the anaerobic ammonia oxidation, so that the dependence of sewage denitrification on a raw water carbon source can be further reduced, and the energy conservation and consumption reduction of sewage treatment are realized.
The prior art reports about research on relevant aspects of AOA process coupled with anaerobic ammonia oxidation technology mainly include:
application number 201910358964.6 discloses a method and a device for treating municipal sewage by using an AOA process for enhancing denitrification through full-flow anaerobic ammonia oxidation, wherein an anaerobic ammonia oxidation suspension carrier is added into the AOA device through the full-flow by using a shortcut nitrification anaerobic ammonia oxidation principle, and the aim of enhancing denitrification is fulfilled by using nitrite and residual ammonia nitrogen generated in each reaction zone of the full-flow as substrates. However, in the application process, the invention has several technical difficulties, which may cause the treatment effect to be not expected. Firstly, the invention considers that when the total nitrogen of the effluent is more than or equal to 15mg/L and the ammonia nitrogen is more than or equal to 5mg/L, the HRT can be prolonged for 2h, but in the practical application process, the volume of the reaction tank is fixed, and the inflow flow rate is generally not changed, so the HRT is not changed; secondly, the nitrite is used as one of the main substrates of the anammox bacteria, and is only used as a byproduct in the invention, which is not beneficial to the enrichment of the anammox bacteria; thirdly, the DO of the aerobic tank is 1-2mg/L, which is not beneficial to reducing the consumption of the carbon source in the aerobic tank; finally, the invention takes the anoxic tank as the end reaction tank, which can not ensure the ammonia nitrogen to reach the standard stably.
Application No. 202110548598.8 discloses a method for treating middle and late landfill leachate by a continuous flow shortcut nitrification/endogenous shortcut denitrification/anaerobic ammonia oxidation integrated process, wherein partial shortcut nitrification is performed in an aerobic section to oxidize part of ammonia nitrogen in inlet water into nitrite nitrogen, an anaerobic section firstly performs anaerobic ammonia oxidation to generate part of nitrate nitrogen, and the nitrate nitrogen is reduced into nitrite nitrogen through endogenous shortcut denitrification to provide nitrite nitrogen for anaerobic ammonia oxidation reaction. Application No. 201710271411.8 discloses a continuous flow AOA semi-short-range anaerobic ammonia oxidation coupled endogenous denitrification method, wherein nitrogen and phosphorus are removed in a mode of carrying out partial short-range nitrification in an aerobic tank and carrying out anaerobic ammonia oxidation and endogenous denitrification dephosphorization in an anoxic tank; application No. 202110336253.6 discloses an AOA coupled anaerobic ammonia oxidation deep denitrification and dephosphorization process, wherein an aerobic section carries out partial shortcut nitrification-anaerobic ammonia oxidation, and then an anoxic section carries out endogenous shortcut denitrification-anaerobic ammonia oxidation.
The above prior art also has the following problems: firstly, the whole system is provided with an aerobic zone, the nitrogen load is reduced by utilizing anaerobic ammonia oxidation, endogenous denitrification is used as a denitrification main body, and the TN of the effluent water has overproof risk when the C/N is too low; secondly, part of the shortcut nitrification needs to control more strict ammonia nitrogen: the nitrite substrate ratio is used for meeting the requirement of a subsequent anaerobic ammonia oxidation substrate, the control is difficult to realize, the requirement of long-term partial short-cut nitrification on the relative abundance of functional bacteria is strict, and the control is difficult to realize.
Application number 201910762403.2 discloses a device and a method for realizing semi-short-range coupling anaerobic ammonia oxidation of a continuous flow AOA biomembrane by hydroxylamine, the device and the method control partial shortcut nitrification of an aerobic tank by adding hydroxylamine reagent into an activated sludge system of the aerobic tank of a reactor, then a mixed solution containing ammonia nitrogen and nitrite nitrogen enters an anoxic tank, and anaerobic ammoniation bacteria on a filler biomembrane generate anaerobic ammonia oxidation reaction by using the ammonia nitrogen and the nitrite nitrogen. However, the invention has the problem that the semi-short-cut nitrification in the aerobic zone can not be maintained for a long time, and the short-cut nitrification in the aerobic zone of the invention completely depends on the activated sludge, and the structural stability of the activated sludge flora is poor.
In summary, the current AOA-coupled anammox related process has the following technical problems:
firstly, the aerobic tank has the problem of carbon loss, the main aerobic tank mostly carries out short-cut nitrification or semi-short-cut nitrification, anaerobic ammonium oxidation bacteria are not enriched, the control DO is relatively high, and excessive carbon loss causes insufficient carbon source in the anoxic tank, so that the denitrification effect is influenced; secondly, the half-shortcut nitrification in the aerobic tank is beneficial to the anaerobic ammoxidation reaction in the anoxic tank, but the half-shortcut nitrification is difficult to control, and the stable operation control is difficult to realize when the C/N of the inlet water is low. Finally, the system takes the anoxic tank as a terminal process, and the ammonia nitrogen cannot directly reach the standard; in summary, there is a need for improvements in the prior art to realize the advantages of AOA coupled anammox processes.
Disclosure of Invention
One of the purposes of the invention is to provide an autotrophic nitrogen removal enhanced AOA water treatment method based on MBBR, which redesigns the existing AOA sewage treatment process, wherein nitrification is jointly ensured by CANON, short-cut nitrification and aerobic IFAS areas, and nitrogen removal is jointly undertaken by CANON, short-cut nitrification coupled anaerobic ammonia oxidation and endogenous denitrification.
In order to achieve the purpose, the invention adopts the following technical scheme:
an autotrophic denitrification reinforced AOA water treatment method based on MBBR is characterized by sequentially comprising the following steps:
a. introducing the sewage to be treated into an anaerobic tank, and mainly performing synthesis of a carbon source in the activated sludge and release of phosphorus in the anaerobic tank, wherein the HRT of the anaerobic tank is 1-2 h;
b. part of the 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, partial NH is completed through short-cut nitrification and anaerobic ammonia oxidation reactions of nitrosobacteria growing in suspension in the sludge and nitrosobacteria and anaerobic ammonia oxidation bacteria growing on the suspension carrier respectively4 +Removing N and TN, simultaneously generating a small amount of nitrate nitrogen, and carrying out denitrification dephosphorization reaction on denitrification dephosphorization bacteria in the sludge under the condition;
c. the effluent of the autotrophic tank enters a short-cut nitrification tank connected with the autotrophic tank, suspension carriers are added into the short-cut nitrification tank, DO is controlled to be 2mg/L, short-cut nitrification reaction is carried out through the sludge and nitrosobacteria in the suspension carriers, and NH is carried out4 +Conversion of-N to NO2 -N, the nitrous accumulation rate is more than 80% in the stage, and meanwhile, phosphorus accumulating bacteria in the sludge are subjected to aerobic phosphorus absorption reaction;
d. the effluent of the shortcut nitrification tank enters an anoxic tank connected with the shortcut nitrification tank, and simultaneously, a part of mixed liquid carried by an overrunning pipeline connected with the anaerobic tank enters the anoxic tank together, wherein the overrunning ratio from the anaerobic tank to the anoxic tank is 10-40%, and denitrification phosphorus removal bacteria and NH rich in internal carbon sources are provided for the anoxic tank4 +N, adding a suspension carrier into the anoxic tank, and attaching anaerobic ammonium oxidation bacteria growing on the suspension carrier to carry out NH4 +-N and NO2 -Removal of-N and generation of small amounts of NO3 -N, denitrifying phosphorus removal reaction of denitrifying phosphorus removal bacteria in sludge to carry out NO3 --removal of N and phosphate;
e. the water outlet of the anoxic pond enters into the connectionIn the subsequent aerobic tank, DO is controlled to be 2-6 mg/L, and residual NH is carried out by nitrifying bacteria in the sludge and the suspension carrier4 +Removal of-N, ensuring effluent NH4 +-stable compliance of N;
the effective specific surface area of the suspension carriers added into the autotrophic tank, the shortcut nitrification tank, the anoxic tank and the aerobic tank is more than or equal to 620m2/m3The 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 carriers in the autotrophic pond and the anoxic pond is 0.97-1.03 g/cm3The density of the suspended carriers in the shortcut nitrification tank and the aerobic tank is 0.94-0.97 g/cm3；
f. And (3) allowing the effluent of the aerobic tank to enter a sedimentation tank for mud-water separation, discharging supernatant of the sedimentation tank out of the system from the upper part, controlling the sludge reflux ratio to be 50-100%, refluxing partial sludge at the bottom of the sedimentation tank to the anaerobic tank, and discharging the rest sludge as residual sludge.
As a preferable scheme of the invention, hydroxylamine hydrochloride solution is added into the shortcut nitrification tank, the concentration of the hydroxylamine solution and the adding flow rate are adjusted according to the water inlet flow rate, the water inlet concentration of the hydroxylamine hydrochloride in the shortcut nitrification tank is controlled to be 5-30 mg/L, when the nitrite accumulation rate of the shortcut nitrification tank is lower than 80%, the hydroxylamine solution is continuously added, and when the nitrite accumulation rate is higher than 80% after 3 continuous days, the adding is stopped.
As another preferable scheme of the invention, the residual sludge discharge amount of the sedimentation tank is adjusted, and the SRT of the sludge is controlled to be 10-25 d.
Preferably, the water outlet ends of the autotrophic tank, the shortcut nitrification tank, the anoxic tank and the aerobic tank are provided with intercepting screens.
Preferably, aeration pipelines are arranged in the autotrophic tank, the shortcut nitrification tank and the aerobic tank.
In the scheme, CANON suspension carriers with mature biofilm formation are added into the autotrophic pond; adding an ANAMMOX suspension carrier with mature biofilm formation into the anoxic pond; and a suspension carrier without a film is added into the aerobic tank.
Another object of the present invention is to provide an MBBR-based autotrophic nitrogen removal enhanced AOA water treatment system, which is characterized in that: the system comprises an anaerobic tank, an autotrophic tank, a shortcut nitrification tank, an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially arranged;
the pipeline between the anaerobic tank and the autotrophic tank is connected with an overrunning pipeline, and the other end of the overrunning pipeline is connected with the pipeline between the shortcut 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 HRT of the autotrophic pond is 2-4 h, the HRT of the short-cut nitrification pond is 1-2 h, the HRT of the anoxic pond is 2-4 h, and the HRT of the aerobic pond 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 systematic nitrification is guaranteed by the autotrophic tank, the short-cut nitrification tank and the aerobic tank together, the ammonia nitrogen removal rate can reach more than 95 percent, and the ammonia nitrogen in the effluent can be less than or equal to 0.5 mg/L;
2) the denitrification effect is good, denitrification is jointly undertaken by CANON, short-cut nitrification coupled anaerobic ammonia oxidation and endogenous denitrification, higher denitrification efficiency can be realized, and the TN of the outlet water after optimized adjustment can be less than or equal to 5 mg/L;
3) the operation is stable, and the optimal hydroxylamine hydrochloride adding concentration is verified through tests aiming at the short-cut nitrification of the sludge membrane composite MBBR form, 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 floras can be further improved by adopting an MBBR form, the load is higher, the occupied area can be saved by more than 60 percent compared with the traditional nitrification and denitrification process, and the minimum HRT (high-resolution thermal transfer) 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 diagram of a treatment process according to the present invention;
FIG. 2 is a graph showing the ammonia nitrogen change in the effluent of the apparatus a and the apparatus b of comparative example 1.
Detailed Description
The invention provides an autotrophic nitrogen removal enhanced AOA water treatment method and system based on MBBR, and the invention is described in detail by combining specific embodiments in order to make the advantages and technical scheme of the invention clearer and clearer.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Spatially relative terms, such as "below," "lower," "upper," "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 in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures. For example, if the items in the figures are 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" can encompass both an orientation of below and above. Other orientations of the components are possible (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
First, some technical terms involved in the present invention will be explained in detail.
The accumulation rate of nitrous oxides: nitrite produced by oxidizing ammonia nitrogen in each unit in the short-cut nitrification tank;
the start end of the 'overrunning pipeline' in the invention is arranged on the pipeline between the anaerobic tank and the autotrophic tank, and the tail end of the 'overrunning pipeline' is arranged on the pipeline between the shortcut nitrification tank and the anoxic tank. The "overrun ratio" refers to the flow rate of the mixed liquid in the overrun line.
"sludge SRT" refers to the average residence time of the activated sludge in the entire system.
Next, the main innovative points of the present invention are explained as follows:
the AOA process adopts the process flow of anaerobic → aerobic → anoxic, and an anaerobic pool utilizes activated sludge to absorb organic matters contained in inlet water, synthesize PHA (internal carbon source) and store the PHA in cells, and simultaneously generate phosphorus release phenomenon; the aerobic tank mainly completes the nitrification of ammonia nitrogen, and the anoxic tank utilizes an internal carbon source synthesized by activated sludge in the anaerobic section to perform denitrification and dephosphorization, so that the dual purposes of denitrification and dephosphorization and one-carbon are realized, and the utilization rate of a raw water carbon source is improved. Therefore, the core of the AOA process is the arrangement of an aerobic tank, or the tank volume is reduced, so that the loss of an internal carbon source is reduced, but the nitrification effect of the aerobic tank is influenced due to the reduction of the tank volume; or is an innovative process form to achieve good nitrification under low DO conditions, thereby reducing carbon loss. In addition, the AOA process performs denitrification through heterotrophic denitrification, so that the nitrogen and phosphorus of the effluent can not be ensured to stably reach the standard by aiming at the treatment of the water with low carbon-nitrogen ratio.
Based on the consideration, the reaction tank is redesigned, and the following four aspects are mainly considered:
firstly, aiming at the problem of carbon loss of an aerobic tank in an AOA (argon oxygen decarburization) process, the process is based on a mud-film composite MBBR (moving bed biofilm reactor) process, the aerobic tank is divided into two parts, wherein an integrated completely autotrophic nitrogen removal CANON process is arranged in front, a low DO (dissolved oxygen) operation is adopted, a short-cut nitrification technology is arranged in back, the reaction rate is high, the retention time is effectively reduced, and therefore the carbon loss of the aerobic tank is reduced.
Secondly, aiming at the problem of difficult control of the short-cut nitrification process, the method of adding hydroxylamine hydrochloride is adopted, the accumulation rate of the nitrite can be stably controlled to be more than 80%, and a stable and sufficient substrate is provided for anaerobic ammonium oxidation bacteria in a rear-end anoxic tank.
Thirdly, aiming at the problem of poor denitrification effect of the wastewater with low carbon-nitrogen ratio, the suspended carriers are used for enriching the anaerobic ammonium oxidation bacteria through the autotrophic tank, and the suspended carriers enriched with the anaerobic ammonium oxidation bacteria are added into the anoxic tank, so that autotrophic denitrification in a certain proportion is realized, and the dependence of a denitrification process of the system on a carbon source is reduced;
fourthly, aiming at the problem of large occupied area of the existing process, the invention is considered in four aspects, the design is not according to the design mode of the traditional activated sludge method, the aerobic tank body adopts a sludge membrane composite MBBR process, and the hydroxylamine is added to control the stable short-cut nitrification process, so that the system treatment load can be improved, and a part of the occupied area of the aerobic tank can be saved; secondly, the autotrophic tank can directly convert ammonia nitrogen into nitrogen gas in an autotrophic nitrogen removal mode, so that the volumes of part of the shortcut nitrification-MBBR tank and the anoxic tank are reduced, and part of occupied area can be saved; and finally, the anoxic tank adopts a sludge-membrane composite MBBR (moving bed biofilm reactor) process, anaerobic ammonium oxidation bacteria are enriched by adding a suspension carrier, endogenous denitrification heterotrophic denitrification and anaerobic ammonium oxidation autotrophic denitrification can be coupled, TN (total nitrogen) removal is realized together, the denitrification load of the anoxic tank is further improved, and the capacity of the anoxic tank is reduced.
The innovation points are closely connected and inseparable, the autotrophic tank removes part of ammonia nitrogen through autotrophic denitrification, reduces the nitrification and denitrification water inflow load and retention time of the subsequent tank body, can also reduce the loss of carbon sources in the activated sludge, and is a key step for the system to reach the standard stably; the shortcut nitrification tank has high reaction rate and relatively easy control, can effectively reduce the retention time of the aerobic tank, further reduce carbon loss, can provide sufficient nitrite, and provides a stable matrix for anaerobic ammonium oxidation bacteria on the suspension carriers of the anoxic tank; the anoxic tank adopts a sludge-membrane composite MBBR (moving bed biofilm reactor) process, and is added through a suspended carrier to enrich anaerobic ammonium oxidation bacteria, so that endogenous denitrification heterotrophic denitrification and anaerobic ammonium oxidation autotrophic denitrification can be coupled, the TN of the effluent of the system is ensured to be stable and reach the standard, and denitrification phosphorus removal bacteria can remove part of phosphorus while denitrifying, so that the concentration of phosphorus in the effluent is effectively reduced; and the aerobic tank is mainly used for ensuring the COD and the ammonia nitrogen to stably reach the standard.
As shown in figure 1, the system of the invention comprises a reaction tank, and as a main improvement point of the invention, the reaction tank is divided into an anaerobic tank, an autotrophic tank, a shortcut nitrification tank, an anoxic tank, an aerobic tank and a sedimentation tank in turn.
The total water inlet pipeline is connected with the anaerobic tank, water to be treated firstly enters the anaerobic tank through the total water inlet pipeline, organic matters in the water are adsorbed by activated sludge in the anaerobic tank, PHA is generated and stored in a human body, meanwhile, anaerobic phosphorus release occurs, and the HRT of the anaerobic tank is 1-2 hours.
The anaerobic tank and the autotrophic tank are communicated, for example, the anaerobic tank and the autotrophic tank can be communicated through a water passing hole arranged at the upper part of the water outlet end of the anaerobic tank, the water outlet of the anaerobic tank enters the autotrophic tank through the water passing hole, a pipeline between the anaerobic tank and the autotrophic tank is connected with an overrunning pipeline, and the other end of the overrunning pipeline is connected to a pipeline between the shortcut nitrification tank and the anoxic tank;
a sludge return pipeline is connected between the sedimentation tank and the anaerobic tank, and the 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 HRT of the autotrophic pond is 2-4 h, the HRT of the short-cut nitrification pond is 1-2 h, the HRT of the anoxic pond is 2-4 h, and the HRT of the aerobic pond is 0.5-1 h;
and adding CANON suspension carriers with mature biofilm formation into the autotrophic tank, adding ANAMMOX suspension carriers with mature biofilm formation into the anoxic tank, and adding suspension carriers without mature biofilm formation into the shortcut nitrification tank and the aerobic tank.
Stirrers are arranged in the anaerobic tank and the anoxic tank; aeration pipelines are arranged in the autotrophic tank, the shortcut nitrification tank and the aerobic tank; the concrete structure of the aeration pipeline and the submersible stirrer 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 620m2/m3The void ratio is more than 90 percent, the filling ratio is more than or equal to 30 percent and less than 67 percent, and the density of the CANON suspension carrier is 0.97-1.03 g/cm3；
The effective specific surface area of the suspension carrier added into the anoxic tank is more than or equal to 620m2/m3The void ratio is more than 90 percent, the filling rate is more than or equal to 30 percent and less than 67 percent, and the density of the suspension carrier is 0.97-1.03 g/cm3；
The effective specific surface area of the suspension carrier added into the aerobic tank is more than or equal to 620m2/m3The void ratio is more than 90 percent, the filling rate is more than or equal to 30 percent and less than 67 percent, and the density of the suspension carrier is 0.94-0.97 g/cm3。
The treatment process of the present invention will be described in detail with reference to the above-mentioned system.
The method specifically comprises the following steps:
firstly, sewage to be treated enters an anaerobic tank, denitrifying phosphorus removal bacteria in sludge absorb organic matters in the sewage to synthesize an internal carbon source, and meanwhile, phosphorus release reaction is completed;
secondly, part of the effluent of the anaerobic tank enters an autotrophic tank connected behind the anaerobic tank, CANON suspension carriers with mature biofilm formation are added into the autotrophic tank, and partial NH is completed through partial nitrification and anaerobic ammonia oxidation reactions of nitrosobacteria growing in the sludge in a suspension manner and nitrosobacteria and anaerobic ammonia oxidation bacteria growing on the CANON suspension carriers respectively4 +removing-N and TN, simultaneously generating a small amount of nitrate nitrogen, and carrying out denitrification dephosphorization reaction on the denitrification dephosphorization bacteria in the sludge under the condition; the filling rate of CANON suspension carrier is more than or equal to 30 percent;
thirdly, enabling effluent from the autotrophic tank to enter a short-cut nitrification tank connected behind the autotrophic tank, controlling DO to be 1-3 mg/L, carrying out short-cut nitrification reaction through nitrosobacteria in sludge and suspended carriers, and enabling NH to be carried out4 +Conversion of-N to NO2 -N, the accumulation rate of the nitrite nitrogen is more than 80% in the stage, and meanwhile, the phosphorus accumulating bacteria in the sludge are subjected to aerobic phosphorus absorption reaction;
fourthly, the effluent of the shortcut nitrification tank enters an anoxic tank connected behind the shortcut nitrification tank, and simultaneously partial mixed liquid carried by an overrunning pipeline connected with the anaerobic tank enters the anoxic tank together, wherein the overrunning ratio from the anaerobic tank to the anoxic tank is 10-40%, and denitrification phosphorus removal bacteria and NH rich in internal carbon sources are provided for the anoxic tank4 +N, carrying out NH by anaerobic ammonium oxidation bacteria attached to and grown on a suspension carrier4 +-N and NO2 -Removal of-N and generation of small amounts of NO3 -N, denitrifying phosphorus removal bacteria in the sludge generate denitrifying phosphorus removal reaction to carry out NO3 --removal of N and phosphate;
the anommox suspension carrier with mature biofilm formation is added into the anoxic tank;
fifthly, enabling the effluent of the anoxic tank to enter an aerobic tank connected behind the anoxic tank, controlling DO to be 2-6 mg/L, and carrying out residue treatment on sludge and nitrobacteria in the suspended carriersResidual NH4 +Removal of-N, ensuring effluent NH4 +-stable compliance with N;
the aerobic tank is added with a suspension carrier without a film, and the filling rate of the suspension carrier in the aerobic tank is more than or equal to 30 percent;
and sixthly, the effluent of the aerobic tank enters a sedimentation tank for mud-water separation, supernatant of the sedimentation tank is discharged out of the system from the upper part, the reflux ratio of sludge is controlled to be 50-100%, partial sludge at the bottom of the sedimentation tank is refluxed to the anaerobic tank, and the rest sludge is discharged as residual sludge.
In the steps, hydroxylamine hydrochloride solution is added into the shortcut nitrification tank, the concentration of the hydroxylamine solution and the adding flow rate are adjusted according to the water inlet flow rate, the water inlet concentration of the hydroxylamine hydrochloride in the shortcut nitrification tank is controlled to be 5-30 mg/L, when the nitrite accumulation rate of the shortcut nitrification tank is lower than 80%, the hydroxylamine solution is continuously added, and when the nitrite accumulation rate is higher than 80% for 3 consecutive days, the adding is stopped.
In the steps, the residual sludge discharge amount of the sedimentation tank is adjusted, 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 serial numbers a to f of certain six groups of shortcut nitrification tank devices are all used for treating main stream municipal sewage, in order to ensure the stable shortcut nitrification effect of the system, the optimal adding concentration is verified by adopting a hydroxylamine hydrochloride adding mode, the experimental result is shown in table 1, when the adding concentration of hydroxylamine hydrochloride is increased from 2mg/L to 6mg/L, the nitrogen accumulation rate of the shortcut nitrification tank is gradually increased to 90 percent, and when the adding concentration of hydroxylamine hydrochloride is further increased, the nitrogen accumulation rate of the system does not increase and decrease reversely, and the hydroxylamine with too high concentration possibly generates toxicity inhibition on ammonia oxidizing bacteria. Therefore, the good short-cut nitrification effect is maintained, the larger the hydroxylamine addition amount is, the better the hydroxylamine addition amount is, and the optimal hydroxylamine hydrochloride addition amount of the short-cut nitrification tank is 6mg/L in view of the comprehensive operation effect.
TABLE 1 Nitrogen accumulation in the system at various hydroxylamine hydrochloride addition concentrations (%)
Example 2:
a certain seven groups of sewage treatment devices are numbered from A to H, the biochemical section adopts a CANON process based on sludge membrane compounding, and for the denitrification effect, the single-factor variable is controlled to be DO which is respectively set to be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 and 0.7 mg/L. The rest operating conditions of the devices are consistent, the removal amount of TN in the autotrophic pond of each device is verified through comparison, and the experimental results are shown in Table 2.
TABLE 2 removal of TN from the system (mg/L) at different DO levels
The result shows that the removal amount of the TN of the autotrophic pond is increased firstly and then decreased along with the increase of DO, when the DO of the autotrophic pond is 0.2-0.5mg/L, the removal amount of the TN of the autotrophic pond can reach 8.9-10.5 mg/L, and when the DO is further increased to 0.6mg/L, the removal amount of the TN of the autotrophic pond is obviously decreased to 7.4mg/L, so that when the DO of the autotrophic pond is 0.2-0.5mg/L, the system can achieve a better TN removal effect.
Example 3:
the three groups of devices are numbered a-c and are all used for treating main stream municipal sewage, the three groups of devices are all in the connection mode of an anaerobic tank, a front aerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank in the process flow, the design parameters and the operation mode of other tank bodies are the same except the front aerobic tank, and 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 front CANON + rear short-cut nitrification mode; the front aerobic tank of the device c adopts a front short-cut nitrification and rear CANON form. The purpose of this example is mainly to study the influence of the setting mode of autotrophic pond on the system treatment effect.
TABLE 3 effluent quality (mg/L) of system in different setting modes of autotrophic pond
As shown in Table 3, the experimental results show that when the current aerobic tank only adopts the CANON process, the ammonia nitrogen and TN in the effluent of the system are respectively 6.34 +/-1.26 mg/L and 18.74 +/-3.67 mg/L which are higher than the first-class A standard; when the current aerobic tank adopts a mode of front short-cut nitrification and rear CANON, the ammonia nitrogen of the effluent of the system can stably reach the standard, but the TN of the effluent is still slightly higher than the first-level A standard; when the current aerobic tank adopts a front-mounted CANON + rear-mounted short-cut nitrification mode, the effluent ammonia nitrogen and TN can be respectively reduced to 0.78 +/-0.14 mg/L and 4.42 +/-0.52 mg/L, and compared with the former two setting modes, the two setting modes are obviously reduced and can stably meet the standard.
Example 4:
and a certain six groups of short-range nitrification devices are numbered from a to f and are used for treating main-flow municipal sewage, the optimal DO of the nitrification MBBR tank needs to be determined in order to ensure the stable short-range nitrification effect of the system, and the experimental results are shown in the table 4.
TABLE 4 System nitrite accumulation Rate (%) under different DO
When DO is 0.5mg/L, the accumulation rate of the nitrite is low and 63%, when the DO is gradually increased to 2mg/L, the accumulation rate of the nitrite is gradually increased to 88%, and when the DO is further increased, the accumulation rate of the nitrite in the system is remarkably reduced, and the possible excessively high DO reduces the inhibition of hydroxylamine on nitrite oxidizing bacteria, so that part of the nitrite is oxidized into nitrate. From the comprehensive operation effect, the optimal DO of the shortcut nitrification tank is 2 mg/L.
Example 5:
the reaction tank of the device b is an anaerobic tank, an autotrophic tank, a shortcut nitrification tank, an anoxic tank and a sedimentation tank in sequence, namely an aerobic tank at the rear end is not arranged, and the effluent of the anoxic tank directly enters the sedimentation tank. The two devices have the same total HRT, the HRT of each functional zone is shown in the table 5, and the experiment aims to mainly study the influence of the arrangement of the rear-end aerobic tank on the system.
TABLE 5 HRT for each functional zone of devices a-b
The experimental result is shown in figure 2, the ammonia nitrogen of the effluent of the device b and the device a is respectively 5.41 +/-0.50 mg/L and 2.12 +/-0.19 mg/L, and the effluent of the device b is higher than that of the device a, which shows that the ammonia nitrogen of the effluent can be obviously reduced by the arrangement of the rear-end aerobic tank, and the stable standard of the ammonia nitrogen of the effluent of the system is ensured.
Parts which are not described in the invention can be realized by adopting or referring to the prior art.
It is further understood that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. An autotrophic nitrogen removal strengthening AOA water treatment method based on MBBR is characterized by sequentially comprising the following steps:
a. introducing the sewage to be treated into an anaerobic tank, and mainly performing synthesis of a carbon source in the activated sludge and release of phosphorus in the anaerobic tank, wherein the HRT of the anaerobic tank is 1-2 h;
b. part of the effluent of the anaerobic tank enters an autotrophic tank connected with the anaerobic tank, suspended carriers are added into the autotrophic tank, DO is controlled to be 0.2-0.5mg/L, and partial NH is completed by performing partial nitrification and anaerobic ammonia oxidation reactions on nitrosobacteria growing in a suspended manner in the sludge and nitrosobacteria and anaerobic ammonia oxidation bacteria growing on the suspended carriers respectively4 +Removing N and TN, simultaneously generating a small amount of nitrate nitrogen, and carrying out biological phosphorus removal reaction on phosphorus accumulating bacteria in the sludge under the condition;
c. the effluent of the autotrophic tank enters a short-cut nitrification tank connected with the autotrophic tank, suspension carriers are added into the short-cut nitrification tank, DO is controlled to be 2mg/L, short-cut nitrification reaction is carried out through the sludge and nitrosobacteria in the suspension carriers, and NH is carried out4 +Conversion of-N to NO2 -N, the accumulation rate of the nitrite nitrogen is more than 80% in the stage, and meanwhile, the phosphorus accumulating bacteria in the sludge are subjected to aerobic phosphorus absorption reaction;
d. the effluent of the shortcut nitrification tank enters an anoxic tank connected with the shortcut nitrification tank, and simultaneously, a part of mixed liquid carried by an overrunning pipeline connected with the anaerobic tank enters the anoxic tank together, wherein the overrunning ratio from the anaerobic tank to the anoxic tank is 10-40%, and denitrification phosphorus removal bacteria and NH rich in internal carbon sources are provided for the anoxic tank4 +N, adding a suspension carrier into the anoxic tank, and attaching anaerobic ammonium oxidation bacteria growing on the suspension carrier to carry out NH4 +-N and NO2 -Removal of-N and generation of small amounts of NO3 -N, denitrifying phosphorus removal reaction of denitrifying phosphorus removal bacteria in sludge to carry out NO3 --removal of N and phosphate;
e. the effluent of the anoxic tank enters an aerobic tank connected behind the anoxic tank, DO is controlled to be 2-4 mg/L, and residual NH is carried out through nitrifying bacteria in sludge and suspension carriers4 +Removal of-N, ensuring effluent NH4 +-stable compliance with N;
the effective specific surface area of the suspension carriers added into the autotrophic tank, the shortcut nitrification tank, the anoxic tank and the aerobic tank is more than or equal to 620m2/m3The void ratio is more than 90 percent, the filling ratio is more than or equal to 30 percent and less than 67 percent, wherein the density of the suspended carriers in the autotrophic pool and the anoxic pool is 0.97-1.03 g/cm3The density of the suspended carriers in the shortcut nitrification tank and the aerobic tank is 0.94-0.97 g/cm3；
f. And (3) allowing the effluent of the aerobic tank to enter a sedimentation tank for mud-water separation, discharging supernatant of the sedimentation tank out of the system from the upper part, controlling the sludge reflux ratio to be 50-100%, refluxing partial sludge at the bottom of the sedimentation tank to the anaerobic tank, and discharging the rest sludge as residual sludge.
2. The MBBR-based autotrophic nitrogen removal enhanced AOA water treatment method according to claim 1, wherein: when the nitrite accumulation rate of the shortcut nitrification tank is lower than 80%, adding hydroxylamine hydrochloride solution with the concentration of 6mg/L into the shortcut nitrification tank, and stopping adding when the nitrite accumulation rate is higher than 80% for 3 consecutive days.
3. The MBBR-based autotrophic nitrogen removal enhanced AOA water treatment method according to claim 1, wherein: and adjusting the residual sludge discharge amount of the sedimentation tank, and controlling the sludge SRT at 10-25 d.
4. The MBBR-based autotrophic nitrogen removal enhanced AOA water treatment method according to claim 1, wherein: the water outlet ends of the autotrophic tank, the shortcut nitrification tank, the anoxic tank and the aerobic tank are all provided with intercepting screens.
5. The MBBR-based autotrophic nitrogen removal enhanced AOA water treatment method according to claim 1, wherein: aeration pipelines are arranged in the autotrophic tank, the shortcut nitrification tank and the aerobic tank, and submersible stirrers are arranged in the anaerobic tank and the anoxic tank.
6. The utility model provides an autotrophic nitrogen removal strengthens AOA water treatment system based on MBBR which characterized in that: the system comprises an anaerobic tank, an autotrophic tank, a shortcut nitrification tank, an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially arranged;
the bottom of the water outlet end of the anaerobic tank is connected with an overrunning pipeline, and the other end of the overrunning pipeline is connected to the bottom of 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 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 HRT of the autotrophic pond is 2-4 h, the HRT of the short-cut nitrification pond is 1-2 h, the HRT of the anoxic pond is 2-4 h, and the HRT of the aerobic pond is 0.5-1 h.
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