CN111547851B - Starting method of integrated shortcut nitrification-anaerobic ammonia oxidation denitrification process - Google Patents
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Abstract
The invention discloses a starting method of an integrated shortcut nitrification-anaerobic ammonia oxidation denitrification process. The starting method comprises the following steps: step 1): inoculating only anaerobic ammonium oxidation bacteria AAOB strains in the integrated reactor, and in the step 1), controlling NH in inlet water of the reactor4 +‑N：NO2 ‑The molar concentration ratio of N to N is 1: 0.5-1: 1.32; step 2): when the number of the anaerobic ammonium oxidation bacteria AAOB strains in the integrated reactor in the step 1) reaches the required number, inoculating AOB strains in the integrated reactor, and in the step 2), enabling NH in the inlet water4 +‑N：NO2 ‑The proportion of N is gradually increased, and the shortcut nitrification and the anaerobic ammonia oxidation are carried out in the reactor simultaneously. The invention is beneficial to realizing multiplication and enrichment of AAOB strains, thereby quickly starting engineering and shortening the starting process of the integrated shortcut nitrification-anaerobic ammonia oxidation reactor.
Description
Technical Field
The invention belongs to the field of novel biological denitrification, and particularly relates to a starting method of an integrated shortcut nitrification-anaerobic ammonia oxidation denitrification process.
Background
The anaerobic ammonia oxidation technology can not be widely applied in engineering practice at present, and the main reason is that the activity of anaerobic ammonia oxidation bacteria is strictly limited by temperature, pH, DO, organic matters and a matrix (a substrate NH for reaction)4 +-N、NO2 -N is also an inhibitor, especially NO2 -Inhibition of-N), etc., resulting in problems of low impact resistance, poor stability, etc. Secondly, because the yield of the anaerobic ammonium oxidation bacteria AAOB strain is low, the generation period is long, and the anaerobic ammonium oxidation bacteria AAOB strain is easy to run off at the initial stage of starting the anaerobic ammonium oxidation reaction, the enrichment of the anaerobic ammonium oxidation bacteria is difficult.
The generation period of the anaerobic ammonium oxidation bacteria AAOB strain is long, and the multiplication time is very long. Different from the laboratory scale, the current practical situation is that the wide application of the anaerobic ammonia oxidation technology is limited due to the scarcity of the AAOB strains of the anaerobic ammonia oxidation bacteria. In general practical engineering, because the anaerobic ammonium oxidation bacteria AAOB strain is scarce, a large amount of strain can not be provided in the early stage of the engineering, the number of the anaerobic ammonium oxidation bacteria AAOB strain in the initial stage of starting the integrated shortcut nitrification-anaerobic ammonium oxidation SBR reactor can only be inoculated by a small amount, for example, only can reach 10% of the designed strain amount, the continuous proliferation of the anaerobic ammonium oxidation bacteria AAOB strain is achieved mainly through continuous culture in the practical engineering, and finally the designed strain amount is achieved, so that the designed load is achieved. The starting period of the practical anaerobic ammonia oxidation engineering is long and difficult, and the starting period of the first practical anaerobic ammonia oxidation engineering located in a wastewater treatment plant of the deer-red lead in the Netherlands is more than three years, so that the difficulty of the process is fully explained.
In the integrated short-cut nitrification-anaerobic ammonia oxidation SBR reactor, AOB and anaerobic ammonia oxidation bacteria AAOB are symbiotic in one system, because the generation period of AOB is short, the yield is high, the generation period of anaerobic ammonia oxidation bacteria AAOB is longer, and the yield is low, the AOB is a dominant strain, the anaerobic ammonia oxidation bacteria AAOB is a disadvantaged strain, the long-term operation is realized, and the ratio of the number of the strains AOB: the number of the anaerobic ammonia oxidizing bacteria AAOB is increased continuously, the living space of the anaerobic ammonia oxidizing bacteria AAOB is occupied by the AOB, and finally the system is unstable until collapse is caused. At the moment, the redundant AOB strains are washed out of the system by human intervention, and simultaneously, the anaerobic ammonium oxidation bacteria AAOB strains are intercepted, so that the strains of the AOB and the anaerobic ammonium oxidation bacteria AAOB are maintained at a normal ratio, and the long-term stable operation of the integrated shortcut nitrification-anaerobic ammonium oxidation SBR reactor is ensured. The AOB generally exists in a flocculent sludge state, the mature anaerobic ammonium oxidation bacteria AAOB sludge generally exists in a granular sludge state, and at present, the interception of the anaerobic ammonium oxidation bacteria AAOB granular sludge is generally realized by adopting a cyclone separator in a manual intervention mode, for example, the technology registered in DEMON company in Switzerland intercepts mature granular sludge with larger specific gravity and larger granules by the action of centrifugal force of the cyclone separator. However, the anammox AAOB often exists in a state of flocculent sludge or fine granular sludge at the initial stage of growth, and is difficult to be intercepted by the cyclone separator. The cyclone separator is used in the initial starting stage of the anaerobic ammonia oxidation engineering, so that flocculent and fine granular anaerobic ammonia oxidation bacteria AAOB are washed out of the system along with flocculent AOB. Therefore, in the starting stage of the anaerobic ammonia oxidation engineering, namely the initial growth stage of the anaerobic ammonia oxidation bacteria AAOB, the technical problem that the starting period is long due to difficulty in enrichment of the anaerobic ammonia oxidation bacteria AAOB cannot be solved by adopting the cyclone separator.
Disclosure of Invention
In order to overcome the technical problems of slow starting speed and long period of the conventional anaerobic ammonium oxidation denitrification technology, the technical scheme aims to provide a starting method of the integrated shortcut nitrification-anaerobic ammonium oxidation denitrification technology, so that the integrated shortcut nitrification-anaerobic ammonium oxidation denitrification technology can be quickly started.
The technical scheme is as follows:
the starting method of the integrated shortcut nitrification-anaerobic ammonia oxidation denitrification process is characterized by comprising the following steps of: the starting stage adopts the following steps:
step 1): inoculating only anaerobic ammonium oxidation bacteria AAOB strains in the integrated reactor, and in the step 1), controlling NH in inlet water of the reactor4 +-N：NO2 -The molar concentration ratio of N to N is 1: 0.5-1: 1.32;
step 2): when the number of the anaerobic ammonium oxidation bacteria AAOB strains in the integrated reactor in the step 1) reaches the required number, inoculating AOB strains in the integrated short-cut nitrification-anaerobic ammonium oxidation reactor, and in the step 2), enabling NH in the inlet water4 +-N：NO2 -The proportion of N is gradually increased, and the shortcut nitrification and the anaerobic ammonia oxidation are carried out in the reactor simultaneously.
Furthermore, in the step 1), the inoculation amount of the anaerobic ammonium oxidation bacteria AAOB strain in the integrated reactor is more than 20mg/L in terms of mixed liquor suspended solids MLSS.
Further, the anaerobic ammonium oxidation bacteria AAOB strain is cultured by using percolate as a matrix.
Further, in the step 2), the inoculation quantity of AOB strains in the integrated shortcut nitrification-anaerobic ammonia oxidation SBR reactor is 500-3000 mg/L in terms of MLSS.
If the anaerobic ammonium oxidation bacteria AAOB strain required by the engineering can be inoculated at one time, and the mixed liquid suspended solid MLSS is more than 100mg/L, the step 1) and the step 2) are carried out simultaneously.
Further, the step 1) is operated according to the water feeding or the water feeding and stirring, precipitating and draining stages.
Further, the water inlet stage in the step 1) controls NO in the integrated reactor2 -N is less than or equal to 100mg/L, and NO is removed according to the inoculated anaerobic ammonium oxidation bacteria AAOB strain2 -The rate of-N determines the water inflow.
Further, the step 1) comprises the following process steps: and (3) feeding water and continuously stirring until the liquid level of the fed water reaches a high level, closing the water feeding pump, carrying out anaerobic stirring for 10-120 min, stopping stirring, standing and precipitating for 30-120 min, opening the water outlet valve, closing the water outlet valve when the liquid level reaches a low level, and leaving the reactor idle for waiting for the next period of water feeding.
Further, the step 2) is operated according to the water inflow or the water inflow simultaneous stirring-aeration-stirring-precipitation-drainage step.
Further, the step 2) comprises the following process steps: feeding water and continuously stirring until the water level reaches a high level, and turning off a water feeding pump; anaerobic stirring for 10-120 min, and stopping stirring; then starting an aeration system, continuously aerating, monitoring dissolved oxygen DO in the running process, and stopping aerating when the dissolved oxygen DO reaches a set value; and starting stirring for 5-30 min, closing stirring, standing the precipitate for 30-120 min, opening a water outlet valve, closing the valve when the liquid level reaches a low level, and leaving the reactor idle for waiting for water inlet in the next period.
Further, in the water inlet stage of the step 2), controlling NO in the reactor2 -N is less than or equal to 100mg/L so as to avoid the inhibition of the nitrite on the anaerobic ammonium oxidation bacteria AAOB.
Further, in the aeration stage of the step 2), controlling the DO of the reactor to be less than or equal to 0.3mg/L and continuously aerating. Under the condition of low dissolved oxygen, continuous non-intermittent aeration, short-cut nitrification and anaerobic ammoxidation are simultaneously carried out.
Further, in the aeration stage of the step 2), when the concentration increment delta DO of the dissolved oxygen in the reactor is more than or equal to 0.5mg/L, the aeration is stopped.
Further, the water inflow in the step 1) and the step 2) adopts an intermittent water inflow mode, specifically, the water inflow is stopped for 1-180 min, and the water inflow is stopped for 1-180 min; then feeding water for 1-180 min, and stopping for 1-180 min; and the process is circulated.
Further, when the total nitrogen volume removal load reaches 0.3kg/m3And d or more, finishing the starting of the integrated shortcut nitrification-anaerobic ammonia oxidation reactor.
The technical effect of the technical scheme is as follows:
in the starting stage step 1), only inoculating anaerobic ammonium oxidation bacteria AAOB strains in the integrated short-cut nitrification-anaerobic ammonium oxidation reactor and controlling NH of inlet water4 +-N：NO2 -The proportion of-N is that only the anaerobic ammonia oxidation reaction is carried out in the reactor, and the short-cut nitrification reaction is not carried out, so that the AAOB strain in the starting stage becomes the dominant strain in the integrated reactor, the multiplication and enrichment of the AAOB strain are favorably realized, the engineering is quickly started, and the starting process of the integrated short-cut nitrification-anaerobic ammonia oxidation reactor is shortened.
In the starting stage step 2), under the condition that the low dissolved oxygen DO is less than or equal to 0.3mg/L, the anaerobic ammonia oxidation reaction can be carried out while the short-cut nitrification is carried out, the reaction is continuously carried out, the intermittence is not needed, the alternation of anaerobism and aerobism is not needed, and the control of the technological process in the starting stage is simpler, more convenient and faster.
Drawings
FIG. 1 is a flow chart of a starting method of the integrated shortcut nitrification-anaerobic ammonia oxidation denitrification process
FIG. 2 shows an integrated shortcut nitrification-anaerobic ammonia oxidation denitrification device
FIG. 3 is a graph showing the TN change of the inlet water and the outlet water of the integrated denitrification process of shortcut nitrification-anaerobic ammonia oxidation of the invention after 60 days
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. However, it should not be understood that the scope of the above-described subject matter of the present invention is limited to the following embodiments, and any technique realized based on the present invention is within the scope of the present invention.
As shown in the attached figure 2, the integrated shortcut nitrification-anaerobic ammonia oxidation denitrification device comprises a water inlet tank (1), a water inlet pipe (2), a water inlet pump (3), a time controller (4), a mechanical stirring device (5), a DO tester (DO) meter (6), an aeration device (7), an integrated shortcut nitrification-anaerobic ammonia oxidation reactor (8), a gas flowmeter (9), a blower (10), a pipe valve (11) and a water outlet pipe (12).
In the embodiment, the effective size of the water inlet pool (1) is phi 1.8 multiplied by 2 meters, and the effective volume is 5 cubic meters; the integrated shortcut nitrification-anaerobic ammonia oxidation reactor (8) adopts an SBR form, the effective size is phi 1.8 multiplied by 4 meters, and the effective volume is 10 cubic meters;
in the embodiment, the water is obtained from late-stage percolate of a certain landfill in Guangxi, the COD concentration is about 3300mg/L, and NH is4 +The concentration of-N is about 2900mg/L, NO2 --N and NO3 -the-N is below 8mg/L, the TN concentration is about 3000mg/L, and the COD/N ratio is about 1.1. The leachate is treated by a water inlet treatment process and then flows into a water inlet pool (1) for the embodiment.
1) Step 1:
firstly, inoculating an anaerobic ammonium oxidation bacterium AAOB strain in an integrated shortcut nitrification-anaerobic ammonium oxidation reactor (8), wherein the inoculation amount is 80mg/L measured by MLSS.
Make the water quality NH in the water inlet tank (1)4 +-N：NO2 --N is equal to 1: 1.2, in this case NH4 +-N mean 1270mg/L, NO2 -the-N mean value is 1527mg/L, and the TN mean value is 2850 mg/L.
The integrated shortcut nitrification-anaerobic ammonia oxidation reactor (8) is operated in a mode of 'stirring-precipitating-draining-while-feeding water'. The specific implementation method comprises the following steps:
opening the mechanical stirring device (5) and continuously stirring; the water inlet pump (3) is started to feed water, and the water inlet principle is to control NO in the reactor2 -N is less than or equal to 80mg/L to avoidInhibition of anammox bacteria AAOB by nitrite; when the water inlet liquid level reaches a high level, the water inlet pump (3) is closed, and the water inlet amount of each time is accumulated to be 3 cubic meters; then anaerobic stirring is carried out for about 120min, and the mechanical stirring device (5) is stopped after the anaerobic ammonia oxidation reaction is finished; standing and precipitating for 30min, opening a water outlet valve (11), discharging the discharged water through a water outlet pipe (12), closing the water outlet valve (11) when the liquid level reaches a low level, and idling the reactor for waiting for water inlet in the next period. In the process, the water inlet pump (3) and the mechanical stirring device (5) can also realize automatic control through the time controller (4) and the PLC.
At this time, only the anammox bacteria AAOB bacteria are inoculated in the integrated shortcut nitrification-anammox reactor (8), so that only the anammox reaction occurs, and no AOB bacteria occur the shortcut nitrification reaction, so that the purity of the anammox bacteria AAOB bacteria in the reactor is high, and the proliferation is rapid.
After 40 days of culture, the MLSS of the anaerobic ammonium oxidation bacteria AAOB strain in the integrated short-cut nitrification-anaerobic ammonium oxidation reactor (8) is about 320mg/L, and the removal load of the total nitrogen reaches 0.6kg/m3·d。
2) Step 2:
and (3) inoculating AOB strains in the integrated shortcut nitrification-anaerobic ammonia oxidation reactor (8), wherein the inoculation amount is 600mg/L measured by MLSS.
Adjusting the water inlet treatment process to ensure that the water quality NH in the water inlet tank (1)4 +-N：NO2 -The proportion of-N increases stepwise. For 20 days, the ratio is from 1: 1.2 step by step increase to 1:0.5, NH in the intake pool at this time4 +The average value of-N is increased to 1860mg/L, while NO2 -the-N mean is reduced to about 930mg/L, and the TN mean is about 2850 mg/L.
The integrated shortcut nitrification-anaerobic ammonia oxidation reactor (8) is operated in a mode of 'stirring while feeding water, stirring, aerating, stirring, precipitating and draining'. The specific implementation method comprises the following steps:
opening the mechanical stirring device (5) and continuously stirring; the water inlet pump (3) is started to feed water, and the water inlet principle is to control NO in the reactor2 -N is less than or equal to 80mg/L so as to avoid the inhibition of nitrite on the anaerobic ammonium oxidation bacteria AAOB; when the water level reaches the high level, the valve is closedClosing the water inlet pump (3), and accumulating the water inflow of 3 cubic meters each time; then anaerobic stirring is carried out for 60min, and the mechanical stirring device (5) is shut down; starting an air blower (10), supplying air to an aeration device (7) through a gas flowmeter (9), monitoring dissolved oxygen of the reactor through a DO measuring instrument (6), controlling DO of the reactor to be 0.2mg/L, continuously aerating, realizing short-cut nitrification under the condition of low dissolved oxygen, simultaneously carrying out anaerobic ammonia oxidation reaction, and continuously carrying out the reaction without intermittence.
When dissolved oxygen DO of the reactor is 0.7mg/L (the dissolved oxygen concentration increment delta DO is 0.5mg/L), stopping aeration, opening the mechanical stirring device (5) for stirring for 10min, then standing for precipitation for 30min, opening the water outlet valve (11), discharging water through the water outlet pipe (12), when the liquid level reaches a low level, closing the water outlet valve (11), and idling the reactor for waiting for water inlet in the next period. In the process, the water inlet pump (3), the mechanical stirring device (5) and the blower (10) can also realize automatic control through the time controller (4), the DO tester (6) and the PLC.
At this time, in the integrated shortcut nitrification-anammox reactor (8), shortcut nitrification and anammox are simultaneously carried out.
After 20 days of culture, the total mixed strain MLSS in the integrated shortcut nitrification-anaerobic ammonia oxidation reactor (8) is about 1500mg/L, and the volume removal load of the total nitrogen reaches 0.72kg/m3D, the total nitrogen of the effluent is reduced to about 450mg/L, and the total nitrogen removal rate is 84.2 percent. The integrated shortcut nitrification-anaerobic ammonia oxidation reactor (8) is successfully started. FIG. 3 is a graph showing TN changes of inlet water and outlet water when the integrated denitrification process of shortcut nitrification-anaerobic ammonia oxidation is started for 60 days.
The total time for starting the anaerobic ammonium oxidation bacteria AAOB granular sludge interception technology is 60 days, and the starting time for realizing the anaerobic ammonium oxidation bacteria AAOB granular sludge interception technology through the cyclone separator is about 120 days under the conditions of the same inflow water quality, the same strain inoculation amount and the like. The technical scheme can realize the quick start of the anaerobic ammonia oxidation process, and the time is shortened by about 50 percent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention and that are made by those of ordinary skill in the art without departing from the inventive concept are intended to be included within the scope of the present invention.
Claims (8)
1. The starting method of the integrated shortcut nitrification-anaerobic ammonia oxidation denitrification process is characterized by comprising the following steps of: the starting stage adopts the following steps:
step 1): inoculating only anaerobic ammonium oxidation bacteria AAOB strains in the integrated reactor, and in the step 1), controlling NH in inlet water of the reactor4 +-N：NO2 -The molar concentration ratio of N to N is 1: 0.5-1: 1.32;
step 2): when the number of the anaerobic ammonium oxidation bacteria AAOB strains in the integrated reactor in the step 1) reaches the required number, inoculating AOB strains in the integrated short-cut nitrification-anaerobic ammonium oxidation reactor, and in the step 2), enabling NH in the inlet water4 +-N：NO2 -The proportion of N is gradually increased, and the shortcut nitrification and the anaerobic ammonia oxidation are carried out in the reactor simultaneously;
in the step 1), the inoculation amount of the anaerobic ammonium oxidation bacteria AAOB strain in the integrated reactor is more than 20mg/L calculated by MLSS;
in the step 2), the inoculation amount of AOB strains of the integrated shortcut nitrification-anaerobic ammonia oxidation reactor is 500-3000 mg/L in terms of MLSS;
the step 1) is operated according to the water inlet or the water inlet and stirring, precipitating and draining stages;
the water inlet stage in the step 1) controls NO in the integrated reactor2 -N is less than or equal to 100mg/L, and NO is removed according to the inoculated anaerobic ammonium oxidation bacteria AAOB strain2 --the rate of N determines the water inflow;
the step 2) is operated according to the steps of water inflow or water inflow simultaneous stirring-aeration-stirring-precipitation-drainage.
2. The start-up method of the integrated shortcut nitrification-anaerobic ammonium oxidation denitrification process as claimed in claim 1, wherein: the process of the step 1) is as follows: and (3) feeding water and continuously stirring until the liquid level of the fed water reaches a high level, closing the water feeding pump, carrying out anaerobic stirring for 10-120 min, stopping stirring, standing and precipitating for 30-120 min, opening the water outlet valve, closing the water outlet valve when the liquid level reaches a low level, and leaving the reactor idle for waiting for the next period of water feeding.
3. The start-up method of the integrated shortcut nitrification-anaerobic ammonium oxidation denitrification process as claimed in claim 1, wherein: the step 2) comprises the following process steps: feeding water and continuously stirring until the water feeding liquid level reaches a high level, and closing the water feeding; anaerobic stirring for 10-120 min, and stopping stirring; then starting an aeration system, continuously aerating, monitoring dissolved oxygen DO in the running process, and stopping aerating when the dissolved oxygen DO reaches a set value; and starting stirring for 5-30 min, closing stirring, standing the precipitate for 30-120 min, opening a water outlet valve, closing the valve when the liquid level reaches a low level, and leaving the reactor idle for waiting for water inlet in the next period.
4. The start-up method of the integrated shortcut nitrification-anaerobic ammonium oxidation denitrification process as claimed in claim 1, wherein: controlling NO in the reactor in the water inlet stage of the step 2)2 --N≤100mg/L。
5. The start-up method of the integrated shortcut nitrification-anaerobic ammonium oxidation denitrification process as claimed in claim 1, wherein: and in the aeration stage of the step 2), controlling the DO of the reactor to be less than or equal to 0.3mg/L and continuously aerating.
6. The start-up method of the integrated shortcut nitrification-anaerobic ammonium oxidation denitrification process as claimed in claim 1, wherein: in the aeration stage of the step 2), when the concentration increment delta DO of the dissolved oxygen in the reactor is more than or equal to 0.5mg/L, the aeration is stopped.
7. The start-up method of the integrated shortcut nitrification-anaerobic ammonium oxidation denitrification process according to claim 2 or claim 3, characterized in that: in the water inlet stage in the step 1) and the step 2), an intermittent water inlet mode is adopted, specifically, water is fed for 1-180 min, and the water is stopped for 1-180 min; then feeding water for 1-180 min, and stopping for 1-180 min; and the process is circulated.
8. The start-up method of the integrated shortcut nitrification-anaerobic ammonium oxidation denitrification process as claimed in claim 1, wherein: when the total nitrogen volume removal load reaches 0.3kg/m3And d, finishing the starting of the integrated shortcut nitrification-anaerobic ammonia oxidation reactor.
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| EP2740713B1 (en) * | 2012-12-07 | 2014-12-17 | FCC Aqualia, S.A. | Method for starting up and controlling a biological process for ammonium removal by the action of autotrophic bacteria in wastewater |
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